added delay to parser

README.md

@@ -1,3 +1,150 @@
 # chronos
 
-A Typst package to draw sequence diagrams with CeTZ
+A Typst package to draw sequence diagrams with CeTZ
+
+---
+
+This package lets you render sequence diagrams directly in Typst. The following boilerplate code creates an empty sequence diagram with two participants:
+
+<table>
+<tr>
+<td><strong>Typst</strong></td>
+<td><strong>Result</strong></td>
+</tr>
+<tr>
+<td>
+
+```typst
+#import "@preview/chronos:0.1.0"
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+})
+```
+
+</td>
+<td><img src="./gallery/readme/boilerplate.png"></td>
+</tr>
+</table>
+
+> *Disclaimer*\
+> The package cannot parse PlantUML syntax for the moment, and thus requires the use of element functions, as shown in the examples.
+> A PlantUML parser is in the TODO list, just not the top priority
+
+## Basic sequences
+
+You can make basic sequences using the `_seq` function:
+
+<table>
+<tr>
+<td><strong>Typst</strong></td>
+<td><strong>Result</strong></td>
+</tr>
+<tr>
+<td>
+
+```typst
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+
+  _seq("Alice", "Bob", comment: "Hello")
+  _seq("Bob", "Bob", comment: "Think")
+  _seq("Bob", "Alice", comment: "Hi")
+})
+```
+
+</td>
+<td><img src="./gallery/readme/simple_sequence.png"></td>
+</tr>
+</table>
+
+You can make lifelines using the following parameters of the `_seq` function:
+ - `enable-dst`: enables the destination lifeline
+ - `create-dst`: creates the destination lifeline and participant
+ - `disable-dst`: disables the destination lifeline
+ - `destroy-dst`: destroys the destination lifeline and participant
+ - `disable-src`: disables the source lifeline
+ - `destroy-src`: destroy the source lifeline and participant
+
+<table>
+<tr>
+<td><strong>Typst</strong></td>
+<td><strong>Result</strong></td>
+</tr>
+<tr>
+<td>
+
+```typst
+#chronos.diagram({
+  import chronos: *
+  _par("A", display-name: "Alice")
+  _par("B", display-name: "Bob")
+  _par("C", display-name: "Charlie")
+  _par("D", display-name: "Derek")
+
+  _seq("A", "B", comment: "hello", enable-dst: true)
+  _seq("B", "B", comment: "self call", enable-dst: true)
+  _seq("C", "B", comment: "hello from thread 2", enable-dst: true, lifeline-style: (fill: rgb("#005500")))
+  _seq("B", "D", comment: "create", create-dst: true)
+  _seq("B", "C", comment: "done in thread 2", disable-src: true, dashed: true)
+  _seq("B", "B", comment: "rc", disable-src: true, dashed: true)
+  _seq("B", "D", comment: "delete", destroy-dst: true)
+  _seq("B", "A", comment: "success", disable-src: true, dashed: true)
+})
+```
+
+</td>
+<td><img src="./gallery/readme/lifelines.png"></td>
+</tr>
+</table>
+
+## Showcase
+
+Several features have already been implemented in Chronos. Don't hesitate to checkout the examples in the [gallery](./gallery) folder to see what you can do. 
+
+#### Quick example reference:
+<table>
+<tr>
+<td><strong>Example</strong></td>
+<td><strong>Features</strong></td>
+</tr>
+<tr>
+<td>
+
+`example1` <br>([PDF](./gallery/example1.pdf)|[Typst](./gallery/example1.typ))
+
+</td>
+<td>Simple cases, color sequences, groups, separators, gaps, self-sequences</td>
+</tr>
+<tr>
+<td>
+
+`example2` <br>([PDF](./gallery/example2.pdf)|[Typst](./gallery/example2.typ))
+
+</td>
+<td>Lifelines, found/lost messages, synchronized sequences, slanted sequences</td>
+</tr>
+<tr>
+<td>
+
+`example3` <br>([PDF](./gallery/example3.pdf)|[Typst](./gallery/example3.typ))
+
+</td>
+<td>Participant shapes, sequence tips, hidden partipicant ends</td>
+</tr>
+<tr>
+<td>
+
+`notes` <br>([PDF](./gallery/notes.pdf)|[Typst](./gallery/notes.typ))
+
+</td>
+<td>Notes (duh), deferred participant creation</td>
+</tr>
+</table>
+
+> [!NOTE]
+> 
+> Many examples were taken/adapted from the PlantUML [documentation](https://plantuml.com/sequence-diagram) on sequence diagrams

TODO.md

@@ -0,0 +1,28 @@
+# TODO
+
+- [x] Basic participants
+- [x] Basic sequences
+- [x] Separators
+- [x] Gaps
+- [x] Groups
+- [x] Self arrows
+- [x] Arrow from start / to end, small arrows
+- [x] Lifelines
+- [x] Different types of participants
+- [x] Notes
+- [x] Synchronized arrows
+- [x] Slanted arrows
+- [x] Different types of arrow tips
+- [x] Sequence comment alignment
+- [x] Fix group size with syncs
+- [ ] Fix column spacing with notes over multiple columns
+- [ ] Fix notes with arrows from start / to end / small arrows
+- [ ] Fix group size with self arrows + notes
+- [ ] Unify styling structure
+- [ ] Add args verification to catch user errors + pretty error messages
+- [ ] PlantUML parser
+- [ ] (Message numbering)
+- [ ] Mainframes
+- [x] Different types of groups (alt/loop/etc.)
+- [ ] Delays
+- [ ] Auto-fit in parent

docs/example.typ

@@ -0,0 +1,39 @@
+#import "../src/lib.typ" as chronos
+
+#let example-preamble = "import \"../src/lib.typ\": *;"
+#let example-scope = (
+  chronos: chronos
+)
+
+#let example(src, show-src: true, vertical: false, fill: true, wrap: true) = {
+  src = src.text
+  let full-src = example-preamble + src
+  let body = eval(full-src, scope: example-scope)
+  let img = if wrap { chronos.diagram(body) } else { body }
+
+  block(width: 100%,
+    align(center,
+      box(
+        stroke: black + 1pt,
+        radius: .5em,
+        fill: if fill {color.white.darken(5%)} else {none},
+        if show-src {
+          let src-block = align(left, raw(src, lang: "typc"))
+          table(
+            columns: if vertical {1} else {2},
+            inset: 1em,
+            align: horizon + center,
+            stroke: none,
+            img,
+            if vertical {table.hline()} else {table.vline()}, src-block
+          )
+        } else {
+          table(
+            inset: 1em,
+            img
+          )
+        }
+      )
+    )
+  )
+}

docs/examples.typ

@@ -0,0 +1,155 @@
+#import "example.typ": example
+
+#let seq-comm-align = example(```
+_par("p1", display-name: "Start participant")
+_par("p2", display-name: "End participant")
+let alignments = (
+  "start", "end",
+  "left", "right",
+  "center"
+)
+for a in alignments {
+  _seq(
+    "p2", "p1",
+    comment: raw(a),
+    comment-align: a
+  )
+}
+```)
+
+#let seq-tips = example(```
+let _seq = _seq.with(comment-align: "center")
+_par("a", display-name: "Alice")
+_par("b", display-name: "Bob")
+
+_seq("a", "b", comment: "Various tips", end-tip: "")
+_seq("a", "b", end-tip: ">", comment: `->`)
+_seq("a", "b", end-tip: ">>", comment: `->>`)
+_seq("a", "b", end-tip: "\\", comment: `-\`)
+_seq("a", "b", end-tip: "\\\\", comment: `-\\`)
+_seq("a", "b", end-tip: "/", comment: `-/`)
+_seq("a", "b", end-tip: "//", comment: `-//`)
+_seq("a", "b", end-tip: "x", comment: `->x`)
+_seq("a", "b", start-tip: "x", comment: `x->`)
+_seq("a", "b", start-tip: "o", comment: `o->`)
+_seq("a", "b", end-tip: ("o", ">"), comment: `->o`)
+_seq("a", "b", start-tip: "o",
+               end-tip: ("o", ">"), comment: `o->o`)
+_seq("a", "b", start-tip: ">",
+               end-tip: ">", comment: `<->`)
+_seq("a", "b", start-tip: ("o", ">"),
+               end-tip: ("o", ">"), comment: `o<->o`)
+_seq("a", "b", start-tip: "x",
+               end-tip: "x", comment: `x<->x`)
+_seq("a", "b", end-tip: ("o", ">>"), comment: `->>o`)
+_seq("a", "b", end-tip: ("o", "\\"), comment: `-\o`)
+_seq("a", "b", end-tip: ("o", "\\\\"), comment: `-\\o`)
+_seq("a", "b", end-tip: ("o", "/"), comment: `-/o`)
+_seq("a", "b", end-tip: ("o", "//"), comment: `-//o`)
+_seq("a", "b", start-tip: "x",
+               end-tip: ("o", ">"), comment: `x->o`)
+```)
+
+#let grp = example(```
+_par("a", display-name: "Alice")
+_par("b", display-name: "Bob")
+
+_grp("Group 1", desc: "Description", {
+  _seq("a", "b", comment: "Authentication")
+  _grp("loop", desc: "1000 times", {
+    _seq("a", "b", comment: "DoS Attack")
+  })
+  _seq("a", "b", end-tip: "x")
+})
+```)
+
+#let alt = example(```
+_par("a", display-name: "Alice")
+_par("b", display-name: "Bob")
+
+_alt(
+  "first encounter", {
+    _seq("a", "b", comment: "Who are you ?")
+    _seq("b", "a", comment: "I'm Bob")
+  },
+
+  "know eachother", {
+    _seq("a", "b", comment: "Hello Bob")
+    _seq("b", "a", comment: "Hello Alice")
+  },
+
+  "best friends", {
+    _seq("a", "b", comment: "Hi !")
+    _seq("b", "a", comment: "Hi !")
+  }
+)
+```)
+
+#let loop = example(```
+_par("a", display-name: "Alice")
+_par("b", display-name: "Bob")
+
+_loop("default loop", {
+  _seq("a", "b", comment: "Are you here ?")
+})
+_gap()
+_loop("min loop", min: 1, {
+  _seq("a", "b", comment: "Are you here ?")
+})
+_gap()
+_loop("min-max loop", min: 1, max: 5, {
+  _seq("a", "b", comment: "Are you still here ?")
+})
+```)
+
+#let sync = example(```
+_par("alice", display-name: "Alice")
+_par("bob", display-name: "Bob")
+_par("craig", display-name: "Craig")
+
+_seq("bob", "alice")  // Unsynchronized
+_seq("bob", "craig")  //  "
+_sync({
+  _seq("bob", "alice")  // Synchronized
+  _seq("bob", "craig")  //  "
+})
+_seq("alice", "bob")  // Unsynchronized
+_seq("craig", "bob")  //  "
+_sync({
+  _seq("alice", "bob")  // Synchronized
+  _seq("craig", "bob")  //  "
+})
+```)
+
+#let gaps-seps = example(```
+_par("alice", display-name: "Alice")
+_par("bob", display-name: "Bob")
+
+_seq("alice", "bob", comment: "Hello")
+_gap(size: 10)
+_seq("bob", "alice", comment: "Hi")
+_sep("Another day")
+_seq("alice", "bob", comment: "Hello again")
+```)
+
+#let notes-shapes = example(```
+_par("alice", display-name: "Alice")
+_par("bob", display-name: "Bob")
+_note("over", `default`, pos: "alice")
+_note("over", `rect`, pos: "bob", shape: "rect")
+_note("over", `hex`, pos: ("alice", "bob"), shape: "hex")
+```)
+
+#let notes-sides = example(```
+_par("alice", display-name: "Alice")
+_par("bob", display-name: "Bob")
+_par("charlie", display-name: "Charlie")
+_note("left", [`left` of Alice], pos: "alice")
+_note("right", [`right` of Charlie], pos: "charlie")
+_note("over", [`over` Alice and Bob], pos: ("alice", "bob"))
+_note("across", [`across` all participants])
+_seq("alice", "bob")
+_note("left", [linked with sequence])
+_note("over", [A note], pos: "alice")
+_note("over", [Aligned note], pos: "charlie", aligned: true)
+```, vertical: true)

docs/gaps_seps.typ

@@ -0,0 +1,8 @@
+/// Creates a gap before the next element
+/// - size (int): Size of the gap
+#let _gap(size: 20) = {}
+
+/// Creates a separator before the next element
+/// #examples.gaps-seps
+/// - name (content): Name to display in the middle of the separator
+#let _sep(name) = {}

docs/groups.typ

@@ -0,0 +1,58 @@
+/// Creates a group of sequences
+/// #examples.grp
+/// - name (content): The group's name
+/// - desc (none, content): Optional description
+/// - type (str): The groups's type (should only be set through other functions like @@_alt() or @@_loop() )
+/// - elmts (array): Elements inside the group (can be sequences, other groups, notes, etc.)
+#let _grp(
+  name,
+  desc: none,
+  type: "default",
+  elmts
+) = {}
+
+/// Creates an alt-else group of sequences
+/// 
+/// It contains at least one section but can have as many as needed
+/// #examples.alt
+/// - desc (content): The alt's label
+/// - elmts (array): Elements inside the alt's first section
+/// - ..args (content, array): Complementary "else" sections.\ You can add as many else sections as you need by passing a content (else section label) followed by an array of elements (see example)
+#let _alt(
+  desc,
+  elmts,
+  ..args
+)
+
+/// Creates a looped group of sequences
+/// #examples.loop
+/// - desc (content): Loop description
+/// - min (none, number): Optional lower bound of the loop
+/// - max (auto, number): Upper bound of the loop. If left as `auto` and `min` is set, it will be infinity (`'*'`)
+/// - elmts (array): Elements inside the group
+#let _loop(
+  desc,
+  min: none,
+  max: auto,
+  elmts
+) = {}
+
+/// Synchronizes multiple sequences\
+/// All elements inside a synchronized group will start at the same time
+/// #examples.sync
+/// - elmts (array): Synchronized elements (generally sequences or notes)
+#let _sync(
+  elmts
+)
+
+/// Creates an optional group\
+/// This is a simple wrapper around @@_grp()
+/// - desc (content): Group description
+/// - elmts (array): Elements inside the group
+#let _opt(desc, elmts) = {}
+
+/// Creates a break group\
+/// This is a simple wrapper around @@_grp()
+/// - desc (content): Group description
+/// - elmts (array): Elements inside the group
+#let _break(desc, elmts) = {}

docs/notes.typ

@@ -0,0 +1,23 @@
+/// Creates a note
+/// - side (str): The side on which to place the note (see @@SIDES for accepted values)
+/// - content (content): The note's content
+/// - pos (none, str, array): Optional participant(s) on which to draw next to / over. If `side` is "left" or "right", sets next to which participant the note is placed. If `side` is "over", sets over which participant(s) it is placed
+/// - color (color): The note's color
+/// - shape (str): The note's shape (see @@SHAPES for accepted values)
+/// - aligned (bool): True if the note is aligned with another note, in which case `side` must be `"over"`, false otherwise
+#let _note(
+  side,
+  content,
+  pos: none,
+  color: rgb("#FEFFDD"),
+  shape: "default",
+  aligned: false
+) = {}
+
+/// Accepted values for `shape` argument of @@_note()
+/// #examples.notes-shapes
+#let SHAPES = ("default", "rect", "hex")
+
+/// Accepted values for `side` argument of @@_note()
+/// #examples.notes-sides
+#let SIDES = ("left", "right", "over", "across")

docs/participants.typ

@@ -0,0 +1,67 @@
+/// Possible participant shapes
+/// #box(width: 100%, align(center)[
+///   #chronos.diagram({
+///     import chronos: *
+///     let _par = _par.with(show-bottom: false)
+///     _par("Foo", display-name: "participant", shape: "participant")
+///     _par("Foo1", display-name: "actor", shape: "actor")
+///     _par("Foo2", display-name: "boundary", shape: "boundary")
+///     _par("Foo3", display-name: "control", shape: "control")
+///     _par("Foo4", display-name: "entity", shape: "entity")
+///     _par("Foo5", display-name: "database", shape: "database")
+///     _par("Foo6", display-name: "collections", shape: "collections")
+///     _par("Foo7", display-name: "queue", shape: "queue")
+///     _par("Foo8", display-name: "custom", shape: "custom", custom-image: TYPST)
+///     _gap()
+///   })
+/// ])
+#let SHAPES = (
+  "participant",
+  "actor",
+  "boundary",
+  "control",
+  "entity",
+  "database",
+  "collections",
+  "queue",
+  "custom"
+)
+
+/// Creates a new participant
+/// - name (str): Unique participant name used as reference in other functions
+/// - display-name (auto, content): Name to display in the diagram. If set to `auto`, `name` is used
+/// - from-start (bool): If set to true, the participant is created at the top of the diagram. Otherwise, it is created at the first reference
+/// - invisible (bool): If set to true, the participant will not be shown
+/// - shape (str): The shape of the participant. Possible values in @@SHAPES
+/// - color (color): The participant's color
+/// - custom-image (none, image): If shape is 'custom', sets the custom image to display
+/// - show-bottom (bool): Whether to display the bottom shape
+/// - show-top (bool): Whether to display the top shape
+/// -> array
+#let _par(
+  name,
+  display-name: auto,
+  from-start: true,
+  invisible: false,
+  shape: "participant",
+  color: rgb("#E2E2F0"),
+  custom-image: none,
+  show-bottom: true,
+  show-top: true,
+) = {}
+
+/// Sets some options for columns between participants
+///
+/// Parameters `p1` and `p2` MUST be consecutive participants (also counting found/lost messages), but they do not need to be in the left to right order
+/// - p1 (str): The first neighbouring participant
+/// - p2 (str): The second neighbouring participant
+/// - width (auto, int, float, length): Optional fixed width of the column\ If the column's content (e.g. sequence comments) is larger, it will overflow
+/// - margin (int, float, length): Additional margin to add to the column\ This margin is not included in `width` and `min-width`, but rather added separately
+/// - min-width (int, float, length): Minimum width of the column\ If set to a larger value than `width`, the latter will be overriden
+#let _col(
+  p1,
+  p2,
+  width: auto,
+  margin: 0,
+  min-width: 0
+) = {}

docs/sequences.typ

@@ -0,0 +1,60 @@
+/// Manually adds an event to the given participant
+/// - participant (str): The participant concerned by the event
+/// - event (str): The event type (see @@EVENTS for ccepted values)
+#let _evt(participant, event) = {}
+
+/// Creates a sequence / message between two participants
+/// - p1 (str): Start participant
+/// - p2 (str): End participant
+/// - comment (none, content): Optional comment to display along the arrow
+/// - comment-align (str): Where to align the comment with respect to the arrow (see @@comment-align for accepted values)
+/// - dashed (bool): Whether the arrow's stroke is dashed or not
+/// - start-tip (str): Start arrow tip (see @@tips for accepted values)
+/// - end-tip (str): End arrow tip (see @@tips for accepted values)
+/// - color (color): Arrow's color
+/// - flip (bool): If true, the arrow is flipped (goes from end to start). This is particularly useful for self calls, to change the side on which the arrow appears
+/// - enable-dst (bool): If true, enables the destination lifeline
+/// - create-dst (bool): If true, creates the destination lifeline and participant
+/// - disable-dst (bool): If true, disables the destination lifeline
+/// - destroy-dst (bool): If true, destroys the destination lifeline and participant
+/// - disable-src (bool): If true, disables the source lifeline
+/// - destroy-src (bool): If true, destroy the source lifeline and participant
+/// - lifeline-style (auto, dict): Optional styling options for lifeline rectangles (see CeTZ documentation for more information on all possible values)
+/// - slant (none, int): Optional slant of the arrow
+/// -> array
+#let _seq(
+  p1,
+  p2,
+  comment: none,
+  comment-align: "left",
+  dashed: false,
+  start-tip: "",
+  end-tip: ">",
+  color: black,
+  flip: false,
+  enable-dst: false,
+  create-dst: false,
+  disable-dst: false,
+  destroy-dst: false,
+  disable-src: false,
+  destroy-src: false,
+  lifeline-style: auto,
+  slant: none
+) = {}
+
+/// Accepted values for `event` argument of @@_evt()
+/// 
+/// `EVENTS = ("create", "destroy", "enable", "disable")`
+#let EVENTS = ("create", "destroy", "enable", "disable")
+
+/// Accepted values for `start-tip` and `end-tip` arguments of @@_seq()
+/// #examples.seq-tips
+#let tips = (
+  "", ">", ">>", "\\", "\\\\", "/", "//", "x", "o",
+)
+
+/// Accepted values for `comment-align` argument of @@_seq()
+/// #examples.seq-comm-align
+#let comment-align = (
+  "start", "end", "left", "center", "right"
+)

gallery.bash

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+
+echo
+echo "Generating gallery PDFs"
+
+set -- ./gallery/*.typ
+cnt="$#"
+i=1
+for f
+do
+    f2="${f/typ/pdf}"
+    echo "($i/$cnt) $f -> $f2"
+    typst c --root ./ "$f" "$f2"
+    i=$((i+1))
+done
+
+set -- ./gallery/readme/*.typ
+cnt="$#"
+i=1
+for f
+do
+    f2="${f/typ/png}"
+    echo "($i/$cnt) $f -> $f2"
+    typst c --root ./ "$f" "$f2"
+    i=$((i+1))
+done

gallery/doc_examples.typ

@@ -0,0 +1,689 @@
+#import "../src/lib.typ": from-plantuml
+
+#set page(width: auto, height: auto)
+
+#let examples = (
+  (
+    [Basic Examples],
+    ```
+    @startuml
+    Alice -> Bob: Authentication Request
+    Bob --> Alice: Authentication Response
+
+    Alice -> Bob: Another authentication Request
+    Alice <-- Bob: Another authentication Response
+    @enduml
+    ```
+  ),
+  (
+    [Declaring participant],
+    ```
+    @startuml
+    participant Participant as Foo
+    actor       Actor       as Foo1
+    boundary    Boundary    as Foo2
+    control     Control     as Foo3
+    entity      Entity      as Foo4
+    database    Database    as Foo5
+    collections Collections as Foo6
+    queue       Queue       as Foo7
+    Foo -> Foo1 : To actor 
+    Foo -> Foo2 : To boundary
+    Foo -> Foo3 : To control
+    Foo -> Foo4 : To entity
+    Foo -> Foo5 : To database
+    Foo -> Foo6 : To collections
+    Foo -> Foo7: To queue
+    @enduml
+    ```
+  ),
+  (
+    [Declaring participant (2)],
+    ```
+    @startuml
+    actor Bob #red
+    ' The only difference between actor
+    'and participant is the drawing
+    participant Alice
+    participant "I have a really\nlong name" as L #99FF99
+    /' You can also declare:
+      participant L as "I have a really\nlong name"  #99FF99
+      '/
+
+    Alice->Bob: Authentication Request
+    Bob->Alice: Authentication Response
+    Bob->L: Log transaction
+    @enduml
+    ```
+  ),
+  (
+    [Use non-letters in participants],
+    ```
+    @startuml
+    Alice -> "Bob()" : Hello
+    "Bob()" -> "This is very\nlong" as Long
+    ' You can also declare:
+    ' "Bob()" -> Long as "This is very\nlong"
+    Long --> "Bob()" : ok
+    @enduml
+    ```
+  ),
+  (
+    [Message to Self],
+    ```
+    @startuml
+    Alice -> Alice: This is a signal to self.\nIt also demonstrates\nmultiline \ntext
+    @enduml
+    ```
+  ),
+  (
+    [Message to Self (2)],
+    ```
+    @startuml
+    Alice <- Alice: This is a signal to self.\nIt also demonstrates\nmultiline \ntext
+    @enduml
+    ```
+  ),
+  (
+    [Change arrow style],
+    ```
+    @startuml
+    Bob ->x Alice
+    Bob -> Alice
+    Bob ->> Alice
+    Bob -\ Alice
+    Bob \\- Alice
+    Bob //-- Alice
+
+    Bob ->o Alice
+    Bob o\\-- Alice
+
+    Bob <-> Alice
+    Bob <->o Alice
+    @enduml
+    ```
+  ),
+  (
+    [Grouping message],
+    ```
+    @startuml
+    Alice -> Bob: Authentication Request
+
+    alt successful case
+
+        Bob -> Alice: Authentication Accepted
+
+    else some kind of failure
+
+        Bob -> Alice: Authentication Failure
+        group My own label
+        Alice -> Log : Log attack start
+            loop 1000 times
+                Alice -> Bob: DNS Attack
+            end
+        Alice -> Log : Log attack end
+        end
+
+    else Another type of failure
+
+      Bob -> Alice: Please repeat
+
+    end
+    @enduml
+    ```
+  ),
+  (
+    [Secondary group label],
+    ```
+    @startuml
+    Alice -> Bob: Authentication Request
+    Bob -> Alice: Authentication Failure
+    group My own label [My own label 2]
+        Alice -> Log : Log attack start
+        loop 1000 times
+            Alice -> Bob: DNS Attack
+        end
+        Alice -> Log : Log attack end
+    end
+    @enduml
+    ```
+  ),
+  (
+    [Notes on messages],
+    ```
+    @startuml
+    Alice->Bob : hello
+    note left: this is a first note
+
+    Bob->Alice : ok
+    note right: this is another note
+
+    Bob->Bob : I am thinking
+    note left
+    a note
+    can also be defined
+    on several lines
+    end note
+    @enduml
+    ```
+  ),
+  (
+    [Some other notes],
+    ```
+    @startuml
+    participant Alice
+    participant Bob
+    note left of Alice #aqua
+    This is displayed
+    left of Alice.
+    end note
+
+    note right of Alice: This is displayed right of Alice.
+
+    note over Alice: This is displayed over Alice.
+
+    note over Alice, Bob #FFAAAA: This is displayed\n over Bob and Alice.
+
+    note over Bob, Alice
+    This is yet another
+    example of
+    a long note.
+    end note
+    @enduml
+    ```
+  ),
+  (
+    [Changing notes shape \[hnote, rnote\]],
+    ```
+    @startuml
+    caller -> server : conReq
+    hnote over caller : idle
+    caller <- server : conConf
+    rnote over server
+     "r" as rectangle
+     "h" as hexagon
+    endrnote
+    rnote over server
+     this is
+     on several
+     lines
+    endrnote
+    hnote over caller
+     this is
+     on several
+     lines
+    endhnote
+    @enduml
+    ```
+  ),
+  (
+    [Note over all participants \[across\]],
+    ```
+    @startuml
+    Alice->Bob:m1
+    Bob->Charlie:m2
+    note over Alice, Charlie: Old method for note over all part. with:\n ""note over //FirstPart, LastPart//"".
+    note across: New method with:\n""note across""
+    Bob->Alice
+    hnote across:Note across all part.
+    @enduml
+    ```
+  ),
+  (
+    [Several notes aligned at the same level \[/\]],
+    ```
+    @startuml
+    note over Alice : initial state of Alice
+    note over Bob : initial state of Bob
+    Bob -> Alice : hello
+    @enduml
+    ```
+  ),
+  (
+    [Several notes aligned at the same level \[/\] (2)],
+    ```
+    @startuml
+    note over Alice : initial state of Alice
+    / note over Bob : initial state of Bob
+    Bob -> Alice : hello
+    @enduml
+    ```
+  ),
+  (
+    [Divider or separator],
+    ```
+    @startuml
+
+    == Initialization ==
+
+    Alice -> Bob: Authentication Request
+    Bob --> Alice: Authentication Response
+
+    == Repetition ==
+
+    Alice -> Bob: Another authentication Request
+    Alice <-- Bob: another authentication Response
+
+    @enduml
+    ```
+  ),
+  (
+    [Delay],
+    ```
+    @startuml
+
+    Alice -> Bob: Authentication Request
+    ...
+    Bob --> Alice: Authentication Response
+    ...5 minutes later...
+    Bob --> Alice: Good Bye !
+
+    @enduml
+    ```
+  ),
+  (
+    [Space],
+    ```
+    @startuml
+
+    Alice -> Bob: message 1
+    Bob --> Alice: ok
+    |||
+    Alice -> Bob: message 2
+    Bob --> Alice: ok
+    ||45||
+    Alice -> Bob: message 3
+    Bob --> Alice: ok
+
+    @enduml
+    ```
+  ),
+  (
+    [Lifeline Activation and Destruction],
+    ```
+    @startuml
+    participant User
+
+    User -> A: DoWork
+    activate A
+
+    A -> B: << createRequest >>
+    activate B
+
+    B -> C: DoWork
+    activate C
+    C --> B: WorkDone
+    destroy C
+
+    B --> A: RequestCreated
+    deactivate B
+
+    A -> User: Done
+    deactivate A
+
+    @enduml
+    ```
+  ),
+  (
+    [Lifeline Activation and Destruction (2)],
+    ```
+    @startuml
+    participant User
+
+    User -> A: DoWork
+    activate A #FFBBBB
+
+    A -> A: Internal call
+    activate A #DarkSalmon
+
+    A -> B: << createRequest >>
+    activate B
+
+    B --> A: RequestCreated
+    deactivate B
+    deactivate A
+    A -> User: Done
+    deactivate A
+
+    @enduml
+    ```
+  ),
+  /*(
+    [Lifeline Activation and Destruction (3)],
+    ```
+    @startuml
+    'autoactivate on
+    alice -> bob : hello
+    bob -> bob : self call
+    bill -> bob /'#005500'/ : hello from thread 2
+    bob -> george ** : create
+    return done in thread 2
+    return rc
+    bob -> george !! : delete
+    return success
+
+    @enduml
+    ```
+  ),*/
+  (
+    [Return],
+    ```
+    @startuml
+    Bob -> Alice : hello
+    activate Alice
+    Alice -> Alice : some action
+    return bye
+    @enduml
+    ```
+  ),
+  (
+    [Participant creation],
+    ```
+    @startuml
+    Bob -> Alice : hello
+
+    create Other
+    Alice -> Other : new
+
+    create /'control'/ String
+    Alice -> String
+    note right : You can also put notes!
+
+    Alice --> Bob : ok
+
+    @enduml
+    ```
+  ),
+  (
+    [Shortcut syntax for activation, deactivation, creation],
+    ```
+    @startuml
+    alice -> bob ++ : hello
+    bob -> bob ++ : self call
+    bob -> bib ++ /' #005500'/ : hello
+    bob -> george ** : create
+    return done
+    return rc
+    bob -> george !! : delete
+    return success
+    @enduml
+    ```
+  ),
+  (
+    [Shortcut syntax for activation, deactivation, creation (2)],
+    ```
+    @startuml
+    alice   ->  bob     ++   : hello1
+    bob     ->  charlie --++ : hello2
+    charlie --> alice   --   : ok
+    @enduml
+    ```
+  ),
+  (
+    [Shortcut syntax for activation, deactivation, creation (3)],
+    ```
+    @startuml
+    alice -> bob   ++ /'#gold'/: hello
+    bob   -> alice --++ /'#gold'/: you too
+    alice -> bob   --: step1
+    alice -> bob   : step2
+    @enduml
+    @enduml
+    ```
+  ),
+  (
+    [Incoming and outgoing messages],
+    ```
+    @startuml
+    [-> A: DoWork
+
+    activate A
+
+    A -> A: Internal call
+    activate A
+
+    A ->] : << createRequest >>
+
+    A<--] : RequestCreated
+    deactivate A
+    [<- A: Done
+    deactivate A
+    @enduml
+    ```
+  ),
+  (
+    [Incoming and outgoing messages (2)],
+    ```
+    @startuml
+    participant Alice
+    participant Bob #lightblue
+    Alice -> Bob
+    Bob -> Carol
+    ...
+    [-> Bob
+    [o-> Bob
+    [o->o Bob
+    [x-> Bob
+    ...
+    [<- Bob
+    [x<- Bob
+    ...
+    Bob ->]
+    Bob ->o]
+    Bob o->o]
+    Bob ->x]
+    ...
+    Bob <-]
+    Bob x<-]
+
+    @enduml
+    ```
+  ),
+  (
+    [Short arrows for incoming and outgoing messages],
+    ```
+    @startuml
+    ?-> Alice    : ""?->""\n**short** to actor1
+    [-> Alice    : ""[->""\n**from start** to actor1
+    [-> Bob      : ""[->""\n**from start** to actor2
+    ?-> Bob      : ""?->""\n**short** to actor2
+    Alice ->]    : ""->]""\nfrom actor1 **to end**
+    Alice ->?    : ""->?""\n**short** from actor1
+    Alice -> Bob : ""->"" \nfrom actor1 to actor2
+    @enduml
+    ```
+  ),
+  (
+    [Normal arrow],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    a ->     b : ""->   ""
+    a ->>    b : ""->>  ""
+    a -\     b : ""-\   ""
+    a -\\    b : ""-\\\\""
+    a -/     b : ""-/   ""
+    a -//    b : ""-//  ""
+    a ->x    b : ""->x  ""
+    a x->    b : ""x->  ""
+    a o->    b : ""o->  ""
+    a ->o    b : ""->o  ""
+    a o->o   b : ""o->o ""
+    a <->    b : ""<->  ""
+    a o<->o  b : ""o<->o""
+    a x<->x  b : ""x<->x""
+    a ->>o   b : ""->>o ""
+    a -\o    b : ""-\o  ""
+    a -\\o   b : ""-\\\\o""
+    a -/o    b : ""-/o  ""
+    a -//o   b : ""-//o ""
+    a x->o   b : ""x->o ""
+    @enduml
+    ```
+  ),
+  (
+    [Itself arrow],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    a ->     a : ""->   ""
+    a ->>    a : ""->>  ""
+    a -\     a : ""-\   ""
+    a -\\    a : ""-\\\\""
+    a -/     a : ""-/   ""
+    a -//    a : ""-//  ""
+    a ->x    a : ""->x  ""
+    a x->    a : ""x->  ""
+    a o->    a : ""o->  ""
+    a ->o    a : ""->o  ""
+    a o->o   a : ""o->o ""
+    a <->    a : ""<->  ""
+    a o<->o  a : ""o<->o""
+    a x<->x  a : ""x<->x""
+    a ->>o   a : ""->>o ""
+    a -\o    a : ""-\o  ""
+    a -\\o   a : ""-\\\\o""
+    a -/o    a : ""-/o  ""
+    a -//o   a : ""-//o ""
+    a x->o   a : ""x->o ""
+    @enduml
+    ```
+  ),
+  (
+    [Incoming messages (with '|')],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    [->      b : ""[->   ""
+    [->>     b : ""[->>  ""
+    [-\      b : ""[-\   ""
+    [-\\     b : ""[-\\\\""
+    [-/      b : ""[-/   ""
+    [-//     b : ""[-//  ""
+    [->x     b : ""[->x  ""
+    [x->     b : ""[x->  ""
+    [o->     b : ""[o->  ""
+    [->o     b : ""[->o  ""
+    [o->o    b : ""[o->o ""
+    [<->     b : ""[<->  ""
+    [o<->o   b : ""[o<->o""
+    [x<->x   b : ""[x<->x""
+    [->>o    b : ""[->>o ""
+    [-\o     b : ""[-\o  ""
+    [-\\o    b : ""[-\\\\o""
+    [-/o     b : ""[-/o  ""
+    [-//o    b : ""[-//o ""
+    [x->o    b : ""[x->o ""
+    @enduml
+    ```
+  ),
+  (
+    [Outgoing messages (with '|')],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    a ->]      : ""->]   ""
+    a ->>]     : ""->>]  ""
+    a -\]      : ""-\]   ""
+    a -\\]     : ""-\\\\]""
+    a -/]      : ""-/]   ""
+    a -//]     : ""-//]  ""
+    a ->x]     : ""->x]  ""
+    a x->]     : ""x->]  ""
+    a o->]     : ""o->]  ""
+    a ->o]     : ""->o]  ""
+    a o->o]    : ""o->o] ""
+    a <->]     : ""<->]  ""
+    a o<->o]   : ""o<->o]""
+    a x<->x]   : ""x<->x]""
+    a ->>o]    : ""->>o] ""
+    a -\o]     : ""-\o]  ""
+    a -\\o]    : ""-\\\\o]""
+    a -/o]     : ""-/o]  ""
+    a -//o]    : ""-//o] ""
+    a x->o]    : ""x->o] ""
+    @enduml
+    ```
+  ),
+  (
+    [Short incoming (with '?')],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    a ->     b : //Long long label//
+    ?->      b : ""?->   ""
+    ?->>     b : ""?->>  ""
+    ?-\      b : ""?-\   ""
+    ?-\\     b : ""?-\\\\""
+    ?-/      b : ""?-/   ""
+    ?-//     b : ""?-//  ""
+    ?->x     b : ""?->x  ""
+    ?x->     b : ""?x->  ""
+    ?o->     b : ""?o->  ""
+    ?->o     b : ""?->o  ""
+    ?o->o    b : ""?o->o ""
+    ?<->     b : ""?<->  ""
+    ?o<->o   b : ""?o<->o""
+    ?x<->x   b : ""?x<->x""
+    ?->>o    b : ""?->>o ""
+    ?-\o     b : ""?-\o  ""
+    ?-\\o    b : ""?-\\\\o ""
+    ?-/o     b : ""?-/o  ""
+    ?-//o    b : ""?-//o ""
+    ?x->o    b : ""?x->o ""
+    @enduml
+    ```
+  ),
+  (
+    [Short outgoing (with '?')],
+    ```
+    @startuml
+    participant Alice as a
+    participant Bob   as b
+    a ->     b : //Long long label//
+    a ->?      : ""->?   ""
+    a ->>?     : ""->>?  ""
+    a -\?      : ""-\?   ""
+    a -\\?     : ""-\\\\?""
+    a -/?      : ""-/?   ""
+    a -//?     : ""-//?  ""
+    a ->x?     : ""->x?  ""
+    a x->?     : ""x->?  ""
+    a o->?     : ""o->?  ""
+    a ->o?     : ""->o?  ""
+    a o->o?    : ""o->o? ""
+    a <->?     : ""<->?  ""
+    a o<->o?   : ""o<->o?""
+    a x<->x?   : ""x<->x?""
+    a ->>o?    : ""->>o? ""
+    a -\o?     : ""-\o?  ""
+    a -\\o?    : ""-\\\\o?""
+    a -/o?     : ""-/o?  ""
+    a -//o?    : ""-//o? ""
+    a x->o?    : ""x->o? ""
+    @enduml
+    ```
+  )
+)
+
+#{
+  for (title, uml) in examples {
+    heading(title)
+    box(
+      stroke: gray,
+      inset: 1em,
+      stack(
+        dir: ltr,
+        spacing: 1em,
+        raw(uml.text, block: true, lang: "plantuml"),
+        from-plantuml(uml)
+      )
+    )
+    pagebreak(weak: true)
+  }
+}

gallery/example1.typ

@@ -10,7 +10,7 @@ Alice <-- Bob: Another authentication Response
 
 
 #chronos.diagram({
-  import "/src/diagram.typ": *
+  import chronos: *
   _seq("Alice", "Bob", comment: "Authentication Request")
   _seq("Bob", "Alice", comment: "Authentication Response", dashed: true)
   
@@ -19,13 +19,88 @@ Alice <-- Bob: Another authentication Response
 })
 
 #chronos.diagram({
-  import "/src/diagram.typ": *
+  import chronos: *
   _seq("Bob", "Alice", comment: "bonjour", color: red)
   _seq("Alice", "Bob", comment: "ok", color: blue)
 })
 
 #chronos.diagram({
-  import "/src/diagram.typ": *
+  import chronos: *
   _seq("Alice", "Bob", comment: "This is a test")
   _seq("Alice", "Callum", comment: "This is another test with a long text")
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("Alice", "Bob", comment: "Authentication Request")
+
+  _alt(
+    "successful case", {
+      _seq("Bob", "Alice", comment: "Authentication Accepted")
+    },
+    "some kind of failure", {
+      _seq("Bob", "Alice", comment: "Authentication Failure")
+
+      _grp("My own label", desc: "My own label2", {
+        _seq("Alice", "Log", comment: "Log attack start")
+        _loop("1000 times", {
+          _seq("Alice", "Bob", comment: "DNS Attack")
+        })
+        _seq("Alice", "Log", comment: "Log attack end")
+      })
+    },
+    "Another type of failure", {
+      _seq("Bob", "Alice", comment: "Please repeat")
+    }
+  )
+})
+
+#chronos.diagram({
+  import chronos: *
+  _par("a", display-name: box(width: 1.5em, height: .5em), show-bottom: false)
+  _par("b", display-name: box(width: 1.5em, height: .5em), show-bottom: false)
+  _col("a", "b", width: 2cm)
+  _loop("a<1", min: 1, {
+    _seq("a", "b", end-tip: ">>")
+    _seq("b", "a", end-tip: ">>")
+  })
+  _seq("a", "b", end-tip: ">>")
+})
+
+#chronos.diagram({
+  import chronos: *
+  _sep("Initialization")
+  _seq("Alice", "Bob", comment: "Authentication Request")
+  _seq("Bob", "Alice", comment: "Authentication Response", dashed: true)
+  
+  _sep("Repetition")
+  _seq("Alice", "Bob", comment: "Another authentication Request")
+  _seq("Bob", "Alice", comment: "another authentication Response", dashed: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("Alice", "Bob", comment: "Authentication Request")
+  _delay()
+  _seq("Bob", "Alice", comment: "Authentication Response")
+  _delay(name: "5 minutes later")
+  _seq("Bob", "Alice", comment: "Good Bye !")
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("Alice", "Bob", comment: "message 1")
+  _seq("Bob", "Alice", comment: "ok", dashed: true)
+  _gap()
+  _seq("Alice", "Bob", comment: "message 2")
+  _seq("Bob", "Alice", comment: "ok", dashed: true)
+  _gap(size: 45)
+  _seq("Alice", "Bob", comment: "message 3")
+  _seq("Bob", "Alice", comment: "ok", dashed: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("Alice", "Alice", comment: "On the\nright")
+  _seq("Alice", "Alice", flip: true, comment: "On the\nleft")
 })

gallery/example2.typ

@@ -0,0 +1,169 @@
+#import "/src/lib.typ" as chronos
+
+
+#chronos.diagram({
+  import chronos: *
+  _seq("User", "A", comment: "DoWork", enable-dst: true)
+  _seq("A", "B", comment: [#sym.quote.angle.l createRequest #sym.quote.angle.r], enable-dst: true)
+  _seq("B", "C", comment: "DoWork", enable-dst: true)
+  _seq("C", "B", comment: "WorkDone", destroy-src: true, disable-src: true, dashed: true)
+  _seq("B", "A", comment: "RequestCreated", disable-src: true, dashed: true)
+  _seq("A", "User", comment: "Done", disable-src: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("User", "A", comment: "DoWork", enable-dst: true, lifeline-style: (fill: rgb("#FFBBBB")))
+  _seq("A", "A", comment: "Internal call", enable-dst: true, lifeline-style: (fill: rgb("#E9967A")))
+  _seq("A", "B", comment: [#sym.quote.angle.l createRequest #sym.quote.angle.r], enable-dst: true)
+  _seq("B", "A", comment: "RequestCreated", disable-src: true, disable-dst: true, dashed: true)
+  _seq("A", "User", comment: "Done", disable-src: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("alice", "bob", comment: "hello", enable-dst: true)
+  _seq("bob", "bob", comment: "self call", enable-dst: true)
+  _seq("bill", "bob", comment: "hello from thread 2", enable-dst: true, lifeline-style: (fill: rgb("#005500")))
+  _seq("bob", "george", comment: "create", create-dst: true)
+  _seq("bob", "bill", comment: "done in thread 2", disable-src: true, dashed: true)
+  _seq("bob", "bob", comment: "rc", disable-src: true, dashed: true)
+  _seq("bob", "george", comment: "delete", destroy-dst: true)
+  _seq("bob", "alice", comment: "success", disable-src: true, dashed: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("alice", "bob", comment: "hello1", enable-dst: true)
+  _seq("bob", "charlie", comment: "hello2", enable-dst: true, disable-src: true)
+  _seq("charlie", "alice", comment: "ok", dashed: true, disable-src: true)
+})
+
+#chronos.diagram({
+  import chronos: *
+  _seq("?", "Alice", comment: [?->\ *short* to actor1])
+  _seq("[", "Alice", comment: [\[->\ *from start* to actor1])
+  _seq("[", "Bob", comment: [\[->\ *from start* to actor2])
+  _seq("?", "Bob", comment: [?->\ *short* to actor2])
+  _seq("Alice", "]", comment: [->\]\ from actor1 *to end*])
+  _seq("Alice", "?", comment: [->?\ *short* from actor1])
+  _seq("Alice", "Bob", comment: [->\ from actor1 to actor2])
+})
+
+#chronos.diagram({
+  import chronos: *
+  _par("alice", display-name: "Alice")
+  _par("bob", display-name: "Bob")
+  _par("craig", display-name: "Craig")
+
+  _seq("bob", "alice")
+  _seq("bob", "craig")
+  _gap()
+  
+  _sync({
+    _seq("bob", "alice", comment: "Synched", comment-align: "start")
+    _seq("bob", "craig", comment: "Synched", comment-align: "start")
+  })
+  _gap()
+  
+  _seq("alice", "bob")
+  _seq("craig", "bob")
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob")
+    _seq("craig", "bob")
+  })
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob", enable-dst: true)
+    _seq("craig", "bob")
+  })
+  _gap()
+
+  _evt("bob", "disable")
+})
+
+#chronos.diagram({
+  import chronos: *
+  _par("alice", display-name: "Alice")
+  _par("bob", display-name: "Bob")
+  _par("craig", display-name: "Craig")
+
+  _seq("alice", "bob")
+  _seq("bob", "craig", slant: auto)
+  _seq("alice", "craig", slant: 20)
+
+  _sync({
+    _seq("alice", "bob", slant: 10)
+    _seq("craig", "bob", slant: 20)
+  })
+
+  _sync({
+    _seq("alice", "bob", slant: auto)
+    _seq("bob", "alice", slant: auto)
+  })
+
+  _gap()
+  _evt("bob", "disable")
+})
+
+#grid(columns: 2, column-gutter: 2em,
+  chronos.diagram({
+    import chronos: *
+
+    _par("alice", display-name: "Alice")
+    _par("bob", display-name: "Bob")
+    _seq("alice", "bob", comment: "This is a very long comment")
+
+    // Left to right
+    _seq("alice", "bob", comment: "Start aligned", comment-align: "start")
+    _seq("alice", "bob", comment: "End aligned", comment-align: "end")
+    _seq("alice", "bob", comment: "Left aligned", comment-align: "left")
+    _seq("alice", "bob", comment: "Right aligned", comment-align: "right")
+    _seq("alice", "bob", comment: "Centered", comment-align: "center")
+    _gap()
+
+    // Right to left
+    _seq("bob", "alice", comment: "Start aligned", comment-align: "start")
+    _seq("bob", "alice", comment: "End aligned", comment-align: "end")
+    _seq("bob", "alice", comment: "Left aligned", comment-align: "left")
+    _seq("bob", "alice", comment: "Right aligned", comment-align: "right")
+    _seq("bob", "alice", comment: "Centered", comment-align: "center")
+    _gap()
+
+    // Slant left to right
+    _seq("alice", "bob", comment: "Start aligned", comment-align: "start", slant: 10)
+    _seq("alice", "bob", comment: "End aligned", comment-align: "end", slant: 10)
+    _seq("alice", "bob", comment: "Left aligned", comment-align: "left", slant: 10)
+    _seq("alice", "bob", comment: "Right aligned", comment-align: "right", slant: 10)
+    _seq("alice", "bob", comment: "Centered", comment-align: "center", slant: 10)
+    _gap()
+
+    // Slant right to left
+    _seq("bob", "alice", comment: "Start aligned", comment-align: "start", slant: 10)
+    _seq("bob", "alice", comment: "End aligned", comment-align: "end", slant: 10)
+    _seq("bob", "alice", comment: "Left aligned", comment-align: "left", slant: 10)
+    _seq("bob", "alice", comment: "Right aligned", comment-align: "right", slant: 10)
+    _seq("bob", "alice", comment: "Centered", comment-align: "center", slant: 10)
+  }),
+
+  chronos.diagram({
+    import chronos: *
+
+    _par("alice", display-name: "Alice")
+
+    _seq("alice", "alice", comment: "Start aligned", comment-align: "start")
+    _seq("alice", "alice", comment: "End aligned", comment-align: "end")
+    _seq("alice", "alice", comment: "Left aligned", comment-align: "left")
+    _seq("alice", "alice", comment: "Right aligned", comment-align: "right")
+    _seq("alice", "alice", comment: "Centered", comment-align: "center")
+
+    _seq("alice", "alice", comment: "Start aligned", comment-align: "start", flip: true)
+    _seq("alice", "alice", comment: "End aligned", comment-align: "end", flip: true)
+    _seq("alice", "alice", comment: "Left aligned", comment-align: "left", flip: true)
+    _seq("alice", "alice", comment: "Right aligned", comment-align: "right", flip: true)
+    _seq("alice", "alice", comment: "Centered", comment-align: "center", flip: true)
+  })
+)

gallery/example3.typ

@@ -0,0 +1,166 @@
+#import "/src/lib.typ" as chronos
+
+#set page(width: auto, height: auto)
+
+#let TYPST = image("typst.png", width: 1.5cm, height: 1.5cm, fit: "contain")
+#let FERRIS = image("ferris.png", width: 1.5cm, height: 1.5cm, fit: "contain")
+#let ME = image("me.jpg", width: 1.5cm, height: 1.5cm, fit: "contain")
+
+#chronos.diagram({
+  import chronos: *
+  _par("Foo", display-name: "Participant", shape: "participant")
+  _par("Foo1", display-name: "Actor", shape: "actor")
+  _par("Foo2", display-name: "Boundary", shape: "boundary")
+  _par("Foo3", display-name: "Control", shape: "control")
+  _par("Foo4", display-name: "Entity", shape: "entity")
+  _par("Foo5", display-name: "Database", shape: "database")
+  _par("Foo6", display-name: "Collections", shape: "collections")
+  _par("Foo7", display-name: "Queue", shape: "queue")
+  _par("Foo8", display-name: "Typst", shape: "custom", custom-image: TYPST)
+  _par("Foo9", display-name: "Ferris", shape: "custom", custom-image: FERRIS)
+  _par("Foo10", display-name: "Baryhobal", shape: "custom", custom-image: ME)
+
+  _seq("Foo", "Foo1", comment: "To actor")
+  _seq("Foo", "Foo2", comment: "To boundary")
+  _seq("Foo", "Foo3", comment: "To control")
+  _seq("Foo", "Foo4", comment: "To entity")
+  _seq("Foo", "Foo5", comment: "To database")
+  _seq("Foo", "Foo6", comment: "To collections")
+  _seq("Foo", "Foo7", comment: "To queue")
+  _seq("Foo", "Foo8", comment: "To Typst")
+  _seq("Foo", "Foo9", comment: "To ferris")
+  _seq("Foo", "Foo10", comment: "To Baryhobal")
+})
+
+#pagebreak()
+#chronos.diagram({
+  import chronos: *
+  _par("me", display-name: "Me", shape: "custom", custom-image: ME)
+  _par("typst", display-name: "Typst", shape: "custom", custom-image: TYPST)
+  _par("rust", display-name: "Rust", shape: "custom", custom-image: FERRIS)
+
+  _seq("me", "typst", comment: "opens document", enable-dst: true)
+  _seq("me", "typst", comment: "types document")
+  _seq("typst", "rust", comment: "compiles content", enable-dst: true)
+  _seq("rust", "typst", comment: "renders document", disable-src: true)
+  _seq("typst", "me", comment: "displays document")
+  _evt("typst", "disable")
+})
+
+#pagebreak()
+
+#stack(dir: ltr, spacing: 1em,
+chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("a", "b", end-tip: ">", comment: `->`)
+  _seq("a", "b", end-tip: ">>", comment: `->>`)
+  _seq("a", "b", end-tip: "\\", comment: `-\`)
+  _seq("a", "b", end-tip: "\\\\", comment: `-\\`)
+  _seq("a", "b", end-tip: "/", comment: `-/`)
+  _seq("a", "b", end-tip: "//", comment: `-//`)
+  _seq("a", "b", end-tip: "x", comment: `->x`)
+  _seq("a", "b", start-tip: "x", comment: `x->`)
+  _seq("a", "b", start-tip: "o", comment: `o->`)
+  _seq("a", "b", end-tip: ("o", ">"), comment: `->o`)
+  _seq("a", "b", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
+  _seq("a", "b", start-tip: ">", end-tip: ">", comment: `<->`)
+  _seq("a", "b", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
+  _seq("a", "b", start-tip: "x", end-tip: "x", comment: `x<->x`)
+  _seq("a", "b", end-tip: ("o", ">>"), comment: `->>o`)
+  _seq("a", "b", end-tip: ("o", "\\"), comment: `-\o`)
+  _seq("a", "b", end-tip: ("o", "\\\\"), comment: `-\\o`)
+  _seq("a", "b", end-tip: ("o", "/"), comment: `-/o`)
+  _seq("a", "b", end-tip: ("o", "//"), comment: `-//o`)
+  _seq("a", "b", start-tip: "x", end-tip: ("o", ">"), comment: `x->o`)
+}),
+
+chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("b", "a", end-tip: ">", comment: `->`)
+  _seq("b", "a", end-tip: ">>", comment: `->>`)
+  _seq("b", "a", end-tip: "\\", comment: `-\`)
+  _seq("b", "a", end-tip: "\\\\", comment: `-\\`)
+  _seq("b", "a", end-tip: "/", comment: `-/`)
+  _seq("b", "a", end-tip: "//", comment: `-//`)
+  _seq("b", "a", end-tip: "x", comment: `->x`)
+  _seq("b", "a", start-tip: "x", comment: `x->`)
+  _seq("b", "a", start-tip: "o", comment: `o->`)
+  _seq("b", "a", end-tip: ("o", ">"), comment: `->o`)
+  _seq("b", "a", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
+  _seq("b", "a", start-tip: ">", end-tip: ">", comment: `<->`)
+  _seq("b", "a", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
+  _seq("b", "a", start-tip: "x", end-tip: "x", comment: `x<->x`)
+  _seq("b", "a", end-tip: ("o", ">>"), comment: `->>o`)
+  _seq("b", "a", end-tip: ("o", "\\"), comment: `-\o`)
+  _seq("b", "a", end-tip: ("o", "\\\\"), comment: `-\\o`)
+  _seq("b", "a", end-tip: ("o", "/"), comment: `-/o`)
+  _seq("b", "a", end-tip: ("o", "//"), comment: `-//o`)
+  _seq("b", "a", start-tip: "x", end-tip: ("o", ">"), comment: `x->o`)
+}),
+
+chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("a", "a", end-tip: ">", comment: `->`)
+  _seq("a", "a", end-tip: ">>", comment: `->>`)
+  _seq("a", "a", end-tip: "\\", comment: `-\`)
+  _seq("a", "a", end-tip: "\\\\", comment: `-\\`)
+  _seq("a", "a", end-tip: "/", comment: `-/`)
+  _seq("a", "a", end-tip: "//", comment: `-//`)
+  _seq("a", "a", end-tip: "x", comment: `->x`)
+  _seq("a", "a", start-tip: "x", comment: `x->`)
+  _seq("a", "a", start-tip: "o", comment: `o->`)
+  _seq("a", "a", end-tip: ("o", ">"), comment: `->o`)
+  _seq("a", "a", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
+  _seq("a", "a", start-tip: ">", end-tip: ">", comment: `<->`)
+  _seq("a", "a", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
+  _seq("a", "a", start-tip: "x", end-tip: "x", comment: `x<->x`)
+  _seq("a", "a", end-tip: ("o", ">>"), comment: `->>o`)
+  _seq("a", "a", end-tip: ("o", "\\"), comment: `-\o`)
+  _seq("a", "a", end-tip: ("o", "\\\\"), comment: `-\\o`)
+  _seq("a", "a", end-tip: ("o", "/"), comment: `-/o`)
+  _seq("a", "a", end-tip: ("o", "//"), comment: `-//o`)
+  _seq("a", "a", start-tip: "x", end-tip: ("o", ">"), comment: `x->o`)
+})
+)
+
+#chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob", show-bottom: false)
+  _par("c", display-name: "Caleb", show-top: false)
+  _par("d", display-name: "Danny", show-bottom: false, show-top: false)
+
+  _gap()
+})
+
+#chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+  _par("c", display-name: "Caleb")
+  _par("d", display-name: "Danny")
+  _par("e", display-name: "Erika")
+
+  _col("a", "b")
+  _col("b", "c", width: 2cm)
+  _col("c", "d", margin: .5cm)
+  _col("d", "e", min-width: 2cm)
+
+  //_seq("b", "c", comment: [Hello World !])
+  //_seq("c", "d", comment: [Hello World])
+  //_seq("d", "e", comment: [Hello World])
+})

gallery/notes.typ

@@ -0,0 +1,145 @@
+#import "/src/lib.typ" as chronos: *
+
+#set page(width: auto, height: auto)
+#chronos.diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("a", "b", comment: [hello])
+  _note("left", [this is a first note])
+
+  _seq("b", "a", comment: [ok])
+  _note("right", [this is another note])
+
+  _seq("b", "b", comment: [I am thinking])
+  _note("left", [a note\ can also be defined\ on several lines])
+})
+
+#pagebreak()
+
+#chronos.diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _note("left", [This is displayed\ left of Alice.], pos: "a", color: rgb("#00FFFF"))
+  _note("right", [This is displayed right of Alice.], pos: "a")
+  _note("over", [This is displayed over Alice.], pos: "a")
+  _note("over", [This is displayed\ over Bob and Alice.], pos: ("a", "b"), color: rgb("#FFAAAA"))
+  _note("over", [This is yet another\ example of\ a long note.], pos: ("a", "b"))
+})
+
+#pagebreak()
+
+#chronos.diagram({
+  _par("caller")
+  _par("server")
+
+  _seq("caller", "server", comment: [conReq])
+  _note("over", [idle], pos: "caller", shape: "hex")
+  _seq("server", "caller", comment: [conConf])
+  _note("over", ["r" as rectangle\ "h" as hexagon], pos: "server", shape: "rect")
+  _note("over", [this is\ on several\ lines], pos: "server", shape: "rect")
+  _note("over", [this is\ on several\ lines], pos: "caller", shape: "hex")
+})
+
+#pagebreak()
+
+#chronos.diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+  _par("c", display-name: "Charlie")
+
+  _seq("a", "b", comment: [m1])
+  _seq("b", "c", comment: [m2])
+
+  _note("over", [Old method for note over all part. with:\ `note over FirstPart, LastPart`.], pos: ("a", "c"))
+  _note("across", [New method with:\ `note across`.])
+
+  _seq("b", "a")
+
+  _note("across", [Note across all part.], shape: "hex")
+})
+
+#pagebreak()
+
+#chronos.diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _note("over", [initial state of Alice], pos: "a")
+  _note("over", [initial state of Bob], pos: "b")
+  _seq("b", "a", comment: [hello])
+})
+
+#chronos.diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+  _par("c", display-name: "Charlie")
+  _par("d", display-name: "Donald")
+  _par("e", display-name: "Eddie")
+
+  _note("over", [initial state of Alice], pos: "a")
+  _note("over", [initial state of Bob the builder], pos: "b", aligned: true)
+
+  _note("over", [Note 1], pos: "a")
+  _note("over", [Note 2], pos: "b", aligned: true)
+  _note("over", [Note 3], pos: "c", aligned: true)
+
+  _seq("a", "d")
+  _note("over", [this is an extremely long note], pos: ("d", "e"))
+})
+
+#pagebreak()
+
+#chronos.diagram({
+  _par("a", display-name: [Alice])
+  _par("b", display-name: [The *Famous* Bob])
+
+  _seq("a", "b", comment: [hello #strike([there])])
+
+  _gap()
+  _seq("b", "a", comment: [ok])
+  _note("left", [
+    This is *bold*\
+    This is _italics_\
+    This is `monospaced`\
+    This is #strike([stroked])\
+    This is #underline([underlined])\
+    This is #underline([waved])\
+  ])
+
+  _seq("a", "b", comment: [A _well formatted_ message])
+  _note("right", [
+    This is #box(text([displayed], size: 18pt), fill: rgb("#5F9EA0"))\
+    #underline([left of]) Alice.
+  ], pos: "a")
+  _note("left", [
+    #underline([This], stroke: red) is #text([displayed], fill: rgb("#118888"))\
+    *#text([left of], fill: rgb("#800080")) #strike([Alice], stroke: red) Bob.*
+  ], pos: "b")
+  _note("over", [
+    #underline([This is hosted], stroke: rgb("#FF33FF")) by #box(baseline: 50%, image("gitea.png", width: 1cm, height: 1cm, fit: "contain"))
+  ], pos: ("a", "b"))
+})
+
+// TODO
+/*
+#pagebreak()
+
+#chronos.diagram({
+  _par("a", display-name: [Alice])
+  _par("b", display-name: [Bob])
+
+  _seq("a", "b", comment: [Hello])
+  _note("left", [This is a note])
+
+  _seq("[", "a", comment: [Test])
+  _note("left", [This is also a note])
+})*/
+
+#pagebreak()
+
+#chronos.diagram({
+  _seq("Bob", "Alice", comment: [Hello])
+  _evt("Other", "create")
+})

gallery/plantuml_test.typ

@@ -0,0 +1,271 @@
+#import "../src/lib.typ": from-plantuml
+
+#set page(width: auto, height: auto)
+
+/*
+#from-plantuml(```
+@startuml
+
+actor User as usr
+participant can_message as can
+control kartculator as kc
+queue XF as xf
+entity Drive as drive
+entity Steering as steering
+
+usr -\ xf : set message "move"
+xf -> can : new value on joystick
+
+== If X axis change value ==
+can -> kc : calculate new position
+kc -> can : build message
+can -> steering : set new position
+
+== If Y axis change value ==
+can -> kc : calculate new torque
+kc -> can : build message
+can -> xf : set message "torque"
+xf -> drive : set new torque
+
+@enduml
+```)
+
+#pagebreak(weak: true)
+
+#from-plantuml(```
+@startuml
+
+actor CAN_BUS as bus
+participant interrupt as ISR
+queue XF as xf
+participant ecan as ecan
+participant canInterface as can
+control canMessageController as msg
+
+
+bus -\\ ISR ++  : can message
+ISR -> can : newMsg
+can -> ecan : read
+ecan --> can : message
+can -> xf : POST XF
+destroy ISR
+    group TICK XF
+xf o-> can : receiveCan()
+can -> msg : processIncoming()
+msg -> can : create message
+can -> xf : POST XF
+    end
+    group TICK XF
+xf o-> can : sendCan()
+can -> ecan : write
+ecan -\\ bus : can message
+    end
+
+@enduml
+```)
+
+#pagebreak(weak: true)
+*/
+
+/*
+#from-plantuml(```
+@startuml
+
+participant "Behavior::StateMachine" as sm
+participant Dispatcher as d
+participant TimeoutManager as tm
+entity "Event::Timeout" as t
+queue "TimeoutManager::timeouts_" as timeouts
+
+autoactivate off
+|||
+|||
+== Schedule timeout ==
+|||
+sm -> sm++ : scheduleTimeout
+sm -> d ++: getDispatcher
+d --> sm --: dispatcher
+sm -> d --++ : scheduleTimeout
+d -> tm ++: getTimeoutManager
+tm --> d --: timeoutManager
+d -> tm --++ : scheduleTimeout
+tm -> t ** : new
+t --> tm
+tm -> timeouts --++: insert
+
+|||
+|||
+== Decrement timeout (and dispatch) ==
+|||
+loop every tickInterval
+?->> tm ++: tick
+tm -> timeouts : getFront
+timeouts -> t ++
+t --> timeouts
+timeouts --> tm : timeout
+tm -> t  --: decrement
+end
+|||
+note left t
+When timeout is 0,
+dispatch event
+end note
+t -> timeouts : pop
+deactivate timeouts
+t ->? --: pushEvent
+
+|||
+|||
+== Unschedule timeout ==
+|||
+sm -> sm++ : unscheduleTimeout
+sm -> d ++: getDispatcher
+d --> sm --: dispatcher
+sm -> d --++ : unscheduleTimeout
+d -> tm ++: getTimeoutManager
+tm --> d --: timeoutManager
+d -> tm --++ : unscheduleTimeout
+tm -> timeouts --: erase
+timeouts -> t !!
+
+@enduml
+```)
+*/
+
+#pagebreak(weak: true)
+
+#from-plantuml(```
+@startuml
+
+participant Behavior as b
+participant Dispatcher as d
+entity Event as e
+participant EventQueue as eq
+queue "EventQueue::queue_" as q
+
+== Create an Event ==
+|||
+?->> b ++ : GEN
+b -> e ** : new
+b -> b --++ : pushEvent
+e -> b : getBehavior
+b --> e ++: setBehavior
+e --> b --
+b -> d ++ : getDispatcher
+d --> b
+b -> d -- : pushEvent
+d ->? -- : push
+
+
+|||
+|||
+== Push Event  ==
+|||
+?->> d ++: pushEvent
+d -> eq--++: push
+eq -> q ++
+q --> eq
+eq -> q -- : pushEndQueue
+
+|||
+|||
+== Dispatch ==
+|||
+?->> d ++: executeOnce
+d -> q : getFront
+q -> e ++
+e --> q
+q --> d : event
+d -> q : pop
+deactivate q
+d -> d --++ : dispatchEvent
+d -> b ++ : getBehavior
+b --> d
+d -> b -- : process
+b -> b--: processEvent
+
+destroy e
+
+@enduml
+```)
+
+#pagebreak(weak: true)
+
+#from-plantuml(```
+@startuml
+'https://plantuml.com/sequence-diagram
+actor User as usr
+participant "Pb L" as pbL
+participant "Pb R" as pbR
+participant "LED L" as ledL
+participant "LED R" as ledR
+
+
+== Single click ==
+
+group Single click left
+usr -\ pbL ++: pressButton
+usr -\ pbL : releaseButton
+pbL -> ledL --++ : blink
+usr -\ pbL ++: pressButton
+usr -\ pbL : releaseButton
+pbL -> ledL -- : endBlink
+deactivate ledL
+end
+
+group Single click right
+usr -\ pbR ++: pressButton
+usr -\ pbR : releaseButton
+pbR -> ledR --++ : blink
+usr -\ pbR ++: pressButton
+usr -\ pbR : releaseButton
+pbR -> ledR -- : endBlink
+deactivate ledR
+end
+
+== Double click ==
+
+group Double click left
+usr -\ pbL ++: pressButton
+usr -\ pbL : releaseButton
+usr -\ pbL : pressButton
+pbL -> ledL --++ : blink
+note right ledL: blink 3x
+ledL ->x ledL -- : finished
+end
+
+group Double click right
+usr -\ pbR ++: pressButton
+usr -\ pbR : releaseButton
+usr -\ pbR : pressButton
+pbR -> ledR --++ : blink
+note right ledR: blink 3x
+ledR ->x ledR -- : finished
+end
+
+== Long click ==
+
+group Long click left
+usr -\ pbL ++: pressButton
+pbL -> ledR--: blink
+activate ledL
+activate ledR
+usr -\ pbL ++: pressButton
+pbL -> ledR -- : endBlink
+deactivate ledL
+deactivate ledR
+end
+
+group Long click right
+usr -\ pbR ++: pressButton
+pbR -> ledR--: blink
+activate ledL
+activate ledR
+usr -\ pbL ++: pressButton
+pbL -> ledR -- : endBlink
+deactivate ledL
+deactivate ledR
+end
+
+@enduml
+```)

gallery/readme/boilerplate.typ

@@ -0,0 +1,13 @@
+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+})

gallery/readme/lifelines.typ

@@ -0,0 +1,24 @@
+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("A", display-name: "Alice")
+  _par("B", display-name: "Bob")
+  _par("C", display-name: "Charlie")
+  _par("D", display-name: "Derek")
+
+  _seq("A", "B", comment: "hello", enable-dst: true)
+  _seq("B", "B", comment: "self call", enable-dst: true)
+  _seq("C", "B", comment: "hello from thread 2", enable-dst: true, lifeline-style: (fill: rgb("#005500")))
+  _seq("B", "D", comment: "create", create-dst: true)
+  _seq("B", "C", comment: "done in thread 2", disable-src: true, dashed: true)
+  _seq("B", "B", comment: "rc", disable-src: true, dashed: true)
+  _seq("B", "D", comment: "delete", destroy-dst: true)
+  _seq("B", "A", comment: "success", disable-src: true, dashed: true)
+})

gallery/readme/simple_sequence.typ

@@ -0,0 +1,17 @@
+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+
+  _seq("Alice", "Bob", comment: "Hello")
+  _seq("Bob", "Bob", comment: "Think")
+  _seq("Bob", "Alice", comment: "Hi")
+})

manual.typ

@@ -0,0 +1,214 @@
+#import "@preview/tidy:0.3.0"
+#import "src/lib.typ" as chronos
+#import "src/participant.typ" as mod-par
+#import "docs/examples.typ"
+#import "docs/example.typ": example
+
+#let TYPST = image("gallery/typst.png", width: 1.5cm, height: 1.5cm, fit: "contain")
+
+#let doc-ref(target, full: false, var: false) = {
+  let (module, func) = target.split(".")
+  let label-name = module + func
+  let display-name = func
+  if full {
+    display-name = target
+  }
+  if not var {
+    label-name += "()"
+    display-name += "()"
+  }
+  link(label(label-name))[#display-name]
+}
+
+#set heading(numbering: (..num) => if num.pos().len() < 4 {
+  numbering("1.1", ..num)
+})
+#{
+  outline(indent: true, depth: 3)
+}
+#show link: set text(fill: blue)
+
+#set page(numbering: "1/1", header: align(right)[chronos #sym.dash.em v#chronos.version])
+#set page(
+  header: locate(loc => align(left)[chronos #sym.dash.em v#chronos.version]),
+  footer: locate(loc => align(center, counter(page).display("1/1", both: true)))
+)
+
+= Introduction
+
+This package lets you create nice sequence diagrams using the CeTZ package.
+
+= Usage
+
+Simply import #link("https://typst.app/universe/package/chronos/")[chronos] and call the `diagram` function:
+#pad(left: 1em)[```typ
+#import "@preview/chronos:0.1.0"
+#chronos.diagram({
+  import chronos: *
+  ...
+})
+```]
+
+= Examples
+
+You can find the following examples and more in the #link("https://git.kb28.ch/HEL/circuiteria/src/branch/main/gallery")[gallery] directory
+
+== Some groups and sequences
+
+#example(```
+chronos.diagram({
+  import chronos: *
+  _seq("Alice", "Bob", comment: "Authentication Request")
+  _seq("Bob", "Alice", comment: "Authentication Failure")
+
+  _grp("My own label", desc: "My own label2", {
+    _seq("Alice", "Log", comment: "Log attack start")
+    _grp("loop", desc: "1000 times", {
+      _seq("Alice", "Bob", comment: "DNS Attack")
+    })
+    _seq("Alice", "Bob", comment: "Log attack end")
+  })
+})
+```, wrap: false, vertical: true)
+
+#pagebreak(weak: true)
+
+== Lifelines
+
+#example(```
+chronos.diagram({
+  import chronos: *
+  _seq("alice", "bob", comment: "hello", enable-dst: true)
+  _seq("bob", "bob", comment: "self call", enable-dst: true)
+  _seq(
+    "bill", "bob",
+    comment: "hello from thread 2",
+    enable-dst: true,
+    lifeline-style: (fill: rgb("#005500"))
+  )
+  _seq("bob", "george", comment: "create", create-dst: true)
+  _seq(
+    "bob", "bill",
+    comment: "done in thread 2",
+    disable-src: true,
+    dashed: true
+  )
+  _seq("bob", "bob", comment: "rc", disable-src: true, dashed: true)
+  _seq("bob", "george", comment: "delete", destroy-dst: true)
+  _seq("bob", "alice", comment: "success", disable-src: true, dashed: true)
+})
+```, wrap: false, vertical: true)
+
+#pagebreak(weak: true)
+
+== Found and lost messages
+
+#example(```
+chronos.diagram({
+  import chronos: *
+  _seq("?", "Alice", comment: [?->\ *short* to actor1])
+  _seq("[", "Alice", comment: [\[->\ *from start* to actor1])
+  _seq("[", "Bob", comment: [\[->\ *from start* to actor2])
+  _seq("?", "Bob", comment: [?->\ *short* to actor2])
+  _seq("Alice", "]", comment: [->\]\ from actor1 *to end*])
+  _seq("Alice", "?", comment: [->?\ *short* from actor1])
+  _seq("Alice", "Bob", comment: [->\ from actor1 to actor2])
+})
+```, wrap: false, vertical: true)
+
+#pagebreak(weak: true)
+
+== Custom images
+
+#example(```
+let load-img(path) = image(path, width: 1.5cm, height: 1.5cm, fit:"contain")
+let TYPST = load-img("../gallery/typst.png")
+let FERRIS = load-img("../gallery/ferris.png")
+let ME = load-img("../gallery/me.jpg")
+
+chronos.diagram({
+  import chronos: *
+  _par("me", display-name: "Me", shape: "custom", custom-image: ME)
+  _par("typst", display-name: "Typst", shape: "custom", custom-image: TYPST)
+  _par("rust", display-name: "Rust", shape: "custom", custom-image: FERRIS)
+
+  _seq("me", "typst", comment: "opens document", enable-dst: true)
+  _seq("me", "typst", comment: "types document")
+  _seq("typst", "rust", comment: "compiles content", enable-dst: true)
+  _seq("rust", "typst", comment: "renders document", disable-src: true)
+  _seq("typst", "me", comment: "displays document", disable-src: true)
+})
+```, wrap: false, vertical: true)
+
+#pagebreak(weak: true)
+
+= Reference
+
+#let par-docs = tidy.parse-module(
+  read("docs/participants.typ"),
+  name: "Participants",
+  require-all-parameters: true,
+  scope: (
+    chronos: chronos,
+    mod-par: mod-par,
+    TYPST: TYPST,
+    doc-ref: doc-ref
+  )
+)
+#tidy.show-module(par-docs, show-outline: false, sort-functions: none)
+
+#pagebreak(weak: true)
+
+#let seq-docs = tidy.parse-module(
+  read("docs/sequences.typ"),
+  name: "Sequences",
+  require-all-parameters: true,
+  scope: (
+    chronos: chronos,
+    doc-ref: doc-ref,
+    examples: examples
+  )
+)
+#tidy.show-module(seq-docs, show-outline: false, sort-functions: none)
+
+#pagebreak(weak: true)
+
+#let grp-docs = tidy.parse-module(
+  read("docs/groups.typ"),
+  name: "Groups",
+  require-all-parameters: true,
+  scope: (
+    chronos: chronos,
+    doc-ref: doc-ref,
+    examples: examples
+  )
+)
+#tidy.show-module(grp-docs, show-outline: false, sort-functions: none)
+
+#pagebreak(weak: true)
+
+#let gap-sep-docs = tidy.parse-module(
+  read("docs/gaps_seps.typ"),
+  name: "Gaps and separators",
+  require-all-parameters: true,
+  scope: (
+    chronos: chronos,
+    doc-ref: doc-ref,
+    examples: examples
+  )
+)
+#tidy.show-module(gap-sep-docs, show-outline: false)
+
+#pagebreak(weak: true)
+
+#let notes-docs = tidy.parse-module(
+  read("docs/notes.typ"),
+  name: "Notes",
+  require-all-parameters: true,
+  scope: (
+    chronos: chronos,
+    doc-ref: doc-ref,
+    examples: examples
+  )
+)
+#tidy.show-module(notes-docs, show-outline: false)

src/consts.typ

@@ -0,0 +1,30 @@
+#let Y-SPACE = 10
+#let PAR-SPACE = 10
+#let COMMENT-PAD = 8
+#let LIFELINE-W = 10
+#let CREATE-OFFSET = 15
+#let DEFAULT-SLANT = 10
+#let CROSS-TIP-SIZE = 4
+#let CIRCLE-TIP-RADIUS = 3
+
+#let SYM-GAP = 5
+#let PAR-PAD = (5pt, 3pt)
+#let ACTOR-WIDTH = 20
+#let BOUNDARY-HEIGHT = 20
+#let CONTROL-HEIGHT = 20
+#let ENTITY-HEIGHT = 20
+#let DATABASE-WIDTH = 24
+#let COLLECTIONS-PAD = (5pt, 3pt)
+#let COLLECTIONS-DX = 3
+#let COLLECTIONS-DY = 3
+#let QUEUE-PAD = (5pt, 3pt)
+
+#let NOTE-PAD = (6, 3)
+#let NOTE-CORNER-SIZE = 6
+#let NOTE-GAP = 3
+#let NOTE-HEX-PAD = (6, 8)
+
+#let COL-DESTRUCTION = rgb("#A80238")
+#let COL-GRP-NAME = rgb("#EEEEEE")
+#let COL-SEP-NAME = rgb("#EEEEEE")
+#let COL-NOTE = rgb("#FEFFDD")

src/diagram.typ

@@ -1,60 +1,246 @@
+#import "utils.typ": get-group-span, fit-canvas
 #import "renderer.typ": render
+#import "participant.typ" as participant: _par, PAR-SPECIALS
+#import "sequence.typ": _seq
 
-#let _seq(
-  p1,
-  p2,
-  comment: none,
-  dashed: false,
-  tip: "default",
-  color: black
-) = {
+#let _gap(size: 20) = {
   return ((
-    type: "seq",
+    type: "gap",
+    size: size
+  ),)
+}
+
+#let _evt(participant, event) = {
+  return ((
+    type: "evt",
+    participant: participant,
+    event: event,
+    lifeline-style: auto
+  ),)
+}
+
+#let _col(p1, p2, width: auto, margin: 0, min-width: 0) = {
+  return ((
+    type: "col",
     p1: p1,
     p2: p2,
-    comment: comment,
-    dashed: dashed,
-    tip: tip,
-    color: color,
+    width: width,
+    margin: margin,
+    min-width: min-width
   ),)
 }
 
-#let _par(name, display-name: auto, start-at: 0) = {
-  return ((
-    type: "par",
-    name: name,
-    display-name: if display-name == auto {name} else {display-name},
-    start-at: start-at
-  ),)
-}
-
-#let _par-exists(participants, name) = {
-  for p in participants {
-    if name == p.name {
-      return true
-    }
+#let diagram(elements, width: auto) = {
+  if elements == none {
+    return
   }
-  return false
-}
-
-#let diagram(elements) = {
+  
   let participants = ()
-  for elmt in elements {
+  let elmts = elements
+  let i = 0
+
+  let activation-history = ()
+
+  // Flatten groups + convert returns
+  while i < elmts.len() {
+    let elmt = elmts.at(i)
+    if elmt.type == "grp" {
+      let grp-elmts = elmt.elmts
+      elmt.elmts = elmt.elmts.map(e => {
+        if e.type == "seq" {
+          if e.p1 == "?" {
+            e.p1 = "?" + e.p2
+          } else if e.p2 == "?" {
+            e.p2 = e.p1 + "?"
+          }
+        }
+        e
+      })
+      elmts.at(i) = elmt
+      elmts = (
+        elmts.slice(0, i + 1) +
+        grp-elmts +
+        ((
+          type: "grp-end"
+        ),) +
+        elmts.slice(i+1)
+      )
+    } else if elmt.type == "seq" {
+      if elmt.enable-dst {
+        activation-history.push(elmt)
+      }
+    } else if elmt.type == "evt" {
+      if elmt.event == "enable" {
+        for elmt2 in elmts.slice(0, i).rev() {
+          if elmt2.type == "seq" {
+            activation-history.push(elmt2)
+            break
+          }
+        }
+      }
+    } else if elmt.type == "ret" {
+      if activation-history.len() == 0 {
+        panic("Cannot return if no lifeline is activated")
+      }
+      let seq = activation-history.pop()
+      elmts.at(i) = _seq(
+        seq.p2, seq.p1,
+        comment: elmt.comment,
+        disable-src: true,
+        dashed: true
+      ).first()
+    }
+    i += 1
+  }
+
+  // List participants
+  let linked = ()
+  let last-seq = none
+  let last-note = none
+  for (i, elmt) in elmts.enumerate() {
     if elmt.type == "par" {
       participants.push(elmt)
     } else if elmt.type == "seq" {
-      if not _par-exists(participants, elmt.p1) {
+      if not participant._exists(participants, elmt.p1) {
         participants.push(_par(elmt.p1).first())
       }
-      if not _par-exists(participants, elmt.p2) {
-        participants.push(_par(elmt.p2).first())
+      if not participant._exists(participants, elmt.p2) {
+        let par = _par(elmt.p2, from-start: not elmt.create-dst).first()
+        participants.push(par)
+      
+      } else if elmt.create-dst {
+        let i = participants.position(p => p.name == elmt.p2)
+        participants.at(i).from-start = false
+      }
+
+      let p1 = elmt.p1
+      let p2 = elmt.p2
+      if elmt.p1 == "?" {
+        p1 = "?" + elmt.p2
+      }
+      if elmt.p2 == "?" {
+        p2 = elmt.p1 + "?"
+      }
+      linked.push(p1)
+      linked.push(p2)
+      last-seq = (
+        elmt: elmt,
+        i: i,
+        p1: p1,
+        p2: p2
+      )
+    } else if elmt.type == "note" {
+      elmt.insert("linked", elmt.pos == none and elmt.side != "across")
+      if elmt.pos == none and elmt.side != "across" {
+        let names = participants.map(p => p.name)
+        let i1 = names.position(n => n == last-seq.p1)
+        let i2 = names.position(n => n == last-seq.p2)
+        let pars = ((i1, last-seq.p1), (i2, last-seq.p2)).sorted(key: p => p.first())
+        if elmt.side == "left" {
+          elmt.pos = pars.first().last()
+        } else if elmt.side == "right" {
+          elmt.pos = pars.last().last()
+        }
+
+        let seq = last-seq.elmt
+        seq.insert("linked-note", elmt)
+        elmts.at(last-seq.i) = seq
+      }
+      if elmt.aligned {
+        let n = last-note.elmt
+        n.aligned-with = elmt
+        elmts.at(last-note.i) = n
+      }
+      elmts.at(i) = elmt
+      if elmt.side == "left" {
+        linked.push("[")
+      } else if elmt.side == "right" {
+        linked.push("]")
+      }
+
+      let pars = none
+      if type(elmt.pos) == str {
+        pars = (elmt.pos,)
+      } else if type(elmt.pos) == array {
+        pars = elmt.pos
+      }
+      if pars != none {
+        for par in pars {
+          if not participant._exists(participants, par) {
+            participants.push(_par(par).first())
+          }
+        }
+      }
+
+      last-note = (
+        elmt: elmt,
+        i: i
+      )
+    } else if elmt.type == "evt" {
+      let par = elmt.participant
+      if not participant._exists(participants, par) {
+        let p = _par(par, from-start: elmt.event != "create").first()
+        participants.push(p)
+      
+      } else if elmt.event == "create" {
+        let i = participants.position(p => p.name == par)
+        participants.at(i).from-start = false
+      }
+    }
+  }
+  linked = linked.dedup()
+
+  let pars = participants
+  participants = ()
+  
+  if "[" in linked {
+    participants.push(_par("[", invisible: true).first())
+  }
+  
+  for (i, p) in pars.enumerate() {
+    let before = _par("?" + p.name, invisible: true).first()
+    let after = _par(p.name + "?", invisible: true).first()
+    
+    if before.name in linked {
+      if participants.len() == 0 or not participants.last().name.ends-with("?") {
+        participants.push(before)
+      } else {
+        participants.insert(-1, before)
+      }
+    }
+
+    participants.push(p)
+
+    if after.name in linked {
+      participants.push(after)
+    }
+  }
+  if "]" in linked {
+    participants.push(_par("]", invisible: true).first())
+  }
+
+  // Add index to participant
+  for (i, p) in participants.enumerate() {
+    p.insert("i", i)
+    participants.at(i) = p
+  }
+
+  // Compute groups spans (horizontal)
+  for (i, elmt) in elmts.enumerate() {
+    if elmt.type == "grp" or elmt.type == "alt" {
+      let (min-i, max-i) = get-group-span(participants, elmt)
+      elmts.at(i).insert("min-i", min-i)
+      elmts.at(i).insert("max-i", max-i)
+    } else if elmt.type == "seq" {
+      if elmt.p1 == "?" {
+        elmts.at(i).p1 = "?" + elmt.p2
+      } else if elmt.p2 == "?" {
+        elmts.at(i).p2 = elmt.p1 + "?"
       }
     }
   }
 
-  render(participants, elements)
-}
-
-#let from-plantuml(code) = {
-  let code = code.text
+  set text(font: "Source Sans 3")
+  let canvas = render(participants, elmts)
+  fit-canvas(canvas, width: width)
 }

src/group.typ

@@ -0,0 +1,99 @@
+#import "@preview/cetz:0.2.2": draw
+#import "consts.typ": *
+
+#let _grp(name, desc: none, type: "default", elmts) = {
+  return ((
+    type: "grp",
+    name: name,
+    desc: desc,
+    grp-type: type,
+    elmts: elmts
+  ),)
+}
+
+#let _alt(desc, elmts, ..args) = {
+  let all-elmts = ()
+  all-elmts += elmts
+  let args = args.pos()
+  for i in range(0, args.len(), step: 2) {
+    let else-desc = args.at(i)
+    let else-elmts = args.at(i + 1, default: ())
+    all-elmts.push((
+      type: "else",
+      desc: else-desc
+    ))
+    all-elmts += else-elmts
+  }
+
+  return _grp("alt", desc: desc, type: "alt", all-elmts)
+}
+
+#let _loop(desc, min: none, max: auto, elmts) = {
+  let name = "loop"
+  if min != none {
+    if max == auto {
+      max = "*"
+    }
+    name += "(" + str(min) + "," + str(max) + ")"
+  }
+  _grp(name, desc: desc, type: "loop", elmts)
+}
+#let _opt(desc, elmts) = grp("opt", desc: desc, type: "opt", elmts)
+#let _break(desc, elmts) = grp("break", desc: desc, type: "break", elmts)
+
+#let render(x0, x1, y0, y1, group) = {
+  let shapes = ()
+  let name = text(group.name, weight: "bold")
+  let m = measure(box(name))
+  let w = m.width / 1pt + 15
+  let h = m.height / 1pt + 6
+  shapes += draw.rect(
+    (x0, y0),
+    (x1, y1)
+  )
+  shapes += draw.merge-path(
+    fill: COL-GRP-NAME,
+    close: true,
+    {
+      draw.line(
+        (x0, y0),
+        (x0 + w, y0),
+        (x0 + w, y0 - h / 2),
+        (x0 + w - 5, y0 - h),
+        (x0, y0 - h)
+      )
+    }
+  )
+  shapes += draw.content(
+    (x0, y0),
+    name,
+    anchor: "north-west",
+    padding: (left: 5pt, right: 10pt, top: 3pt, bottom: 3pt)
+  )
+
+  if group.desc != none {
+    shapes += draw.content(
+      (x0 + w, y0),
+      text([\[#group.desc\]], weight: "bold", size: .8em),
+      anchor: "north-west",
+      padding: 3pt
+    )
+  }
+
+  return shapes
+}
+
+#let render-else(x0, x1, y, elmt) = {
+  let shapes = draw.line(
+    (x0, y),
+    (x1, y),
+    stroke: (dash: (2pt, 1pt), thickness: .5pt)
+  )
+  shapes += draw.content(
+    (x0, y),
+    text([\[#elmt.desc\]], weight: "bold", size: .8em),
+    anchor: "north-west",
+    padding: 3pt
+  )
+  return shapes
+}

src/lib.typ

@@ -1 +1,10 @@
-#import "diagram.typ": diagram, from-plantuml
+#let version = version(0, 1, 1)
+#import "diagram.typ": diagram, _gap, _evt, _col
+#import "parser.typ": from-plantuml
+
+#import "sequence.typ": _seq, _ret
+#import "group.typ": _grp, _loop, _alt, _opt, _break
+#import "participant.typ": _par
+#import "separator.typ": _sep, _delay
+#import "note.typ": _note
+#import "sync.typ": _sync

src/note.typ

@@ -0,0 +1,185 @@
+#import "@preview/cetz:0.2.2": draw
+#import "consts.typ": *
+
+#let SIDES = (
+  "left",
+  "right",
+  "over",
+  "across"
+)
+
+#let SHAPES = (
+  "default",
+  "rect",
+  "hex"
+)
+
+#let _note(side, content, pos: none, color: COL-NOTE, shape: "default", aligned: false) = {
+  if side == "over" {
+    if pos == none {
+      panic("Pos cannot be none with side 'over'")
+    }
+  }
+  if aligned {
+    if side != "over" {
+      panic("Aligned notes can only be over a participant (got side '" + side + "')")
+    }
+  }
+  if color == auto {
+    color = COL-NOTE
+  }
+  return ((
+    type: "note",
+    side: side,
+    content: content,
+    pos: pos,
+    color: color,
+    shape: shape,
+    aligned: aligned,
+    aligned-with: none
+  ),)
+}
+
+#let get-note-box(note) = {
+  let PAD = if note.shape == "hex" {NOTE-HEX-PAD} else {NOTE-PAD}
+  let inset = (
+    left: PAD.last() * 1pt,
+    right: PAD.last() * 1pt,
+    top: PAD.first() * 1pt,
+    bottom: PAD.first() * 1pt,
+  )
+  if note.shape == "default" {
+    inset.right += NOTE-CORNER-SIZE * 1pt
+  }
+  if note.side == "left" {
+    inset.right += NOTE-GAP * 1pt
+  } else if note.side == "right" {
+    inset.left += NOTE-GAP * 1pt
+  }
+  return box(note.content, inset: inset)
+}
+
+#let get-size(note) = {
+  let PAD = if note.shape == "hex" {NOTE-HEX-PAD} else {NOTE-PAD}
+  let m = measure(box(note.content))
+  let w = m.width / 1pt + PAD.last() * 2
+  let h = m.height / 1pt + PAD.first() * 2
+  if note.shape == "default" {
+    w += NOTE-CORNER-SIZE
+  }
+  return (
+    width: w,
+    height: h
+  )
+}
+
+#let _get-base-x(pars-i, x-pos, note) = {
+  if note.side == "across" {
+    return (x-pos.first() + x-pos.last()) / 2
+  }
+  if note.side == "over" {
+    if type(note.pos) == array {
+      let xs = note.pos.map(par => x-pos.at(pars-i.at(par)))
+      return (calc.min(..xs) + calc.max(..xs)) / 2
+    }
+  }
+  return x-pos.at(pars-i.at(note.pos))
+}
+
+#let render(pars-i, x-pos, note, y, lifelines) = {
+  let shapes = ()
+  let PAD = if note.shape == "hex" {NOTE-HEX-PAD} else {NOTE-PAD}
+  let m = measure(box(note.content))
+  let w = m.width / 1pt + PAD.last() * 2
+  let h = m.height / 1pt + PAD.first() * 2
+  let total-w = w
+  if note.shape == "default" {
+    total-w += NOTE-CORNER-SIZE
+  }
+
+  let base-x = _get-base-x(pars-i, x-pos, note)
+
+  let i = none
+  if note.pos != none and type(note.pos) == str {
+    i = pars-i.at(note.pos)
+  }
+  let x0 = base-x
+  if note.side == "left" {
+    x0 -= NOTE-GAP
+    x0 -= total-w
+    if lifelines.at(i).level != 0 {
+      x0 -= LIFELINE-W / 2
+    }
+  } else if note.side == "right" {
+    x0 += NOTE-GAP
+    x0 += lifelines.at(i).level * LIFELINE-W / 2
+  } else if note.side == "over" or note.side == "across" {
+    x0 -= total-w / 2
+  }
+
+  let x1 = x0 + w
+  let x2 = x0 + total-w
+  let y0 = y
+
+  if note.linked {
+    y0 += h / 2
+  }
+  let y1 = y0 - h
+
+  if note.shape == "default" {
+    shapes += draw.merge-path(
+      stroke: black + .5pt,
+      fill: note.color,
+      close: true,
+      {
+        draw.line(
+          (x0, y0),
+          (x1, y0),
+          (x2, y0 - NOTE-CORNER-SIZE),
+          (x2, y1),
+          (x0, y1)
+        )
+      }
+    )
+    shapes += draw.line((x1, y0), (x1, y0 - NOTE-CORNER-SIZE), (x2, y0 - NOTE-CORNER-SIZE), stroke: black + .5pt)
+  } else if note.shape == "rect" {
+    shapes += draw.rect(
+      (x0, y0),
+      (x2, y1),
+      stroke: black + .5pt,
+      fill: note.color
+    )
+  } else if note.shape == "hex" {
+    let lx = x0 + PAD.last()
+    let rx = x2 - PAD.last()
+    let my = (y0 + y1) / 2
+    shapes += draw.merge-path(
+      stroke: black + .5pt,
+      fill: note.color,
+      close: true,
+      {
+        draw.line(
+          (lx, y0),
+          (rx, y0),
+          (x2, my),
+          (rx, y1),
+          (lx, y1),
+          (x0, my),
+        )
+      }
+    )
+  }
+
+  shapes += draw.content(
+    ((x0 + x1)/2, (y0 + y1)/2),
+    note.content,
+    anchor: "center"
+  )
+
+  if note.aligned-with == none and (note.pos != none or note.side == "across") {
+    y -= h
+  }
+
+  let r = (y, shapes)
+  return r
+}

src/participant.typ

@@ -0,0 +1,361 @@
+#import "@preview/cetz:0.2.2": draw
+#import "consts.typ": *
+
+#let PAR-SPECIALS = "?[]"
+#let SHAPES = (
+  "participant",
+  "actor",
+  "boundary",
+  "control",
+  "entity",
+  "database",
+  "collections",
+  "queue",
+  "custom"
+)
+#let DEFAULT-COLOR = rgb("#E2E2F0")
+
+#let _par(
+  name,
+  display-name: auto,
+  from-start: true,
+  invisible: false,
+  shape: "participant",
+  color: DEFAULT-COLOR,
+  custom-image: none,
+  show-bottom: true,
+  show-top: true,
+) = {
+  if color == auto {
+    color = DEFAULT-COLOR
+  }
+  return ((
+    type: "par",
+    name: name,
+    display-name: if display-name == auto {name} else {display-name},
+    from-start: from-start,
+    invisible: invisible,
+    shape: shape,
+    color: color,
+    custom-image: custom-image,
+    show-bottom: show-bottom,
+    show-top: show-top
+  ),)
+}
+
+#let _exists(participants, name) = {
+  if name == "?" or name == "[" or name == "]" {
+    return true
+  }
+
+  for p in participants {
+    if name == p.name {
+      return true
+    }
+  }
+  return false
+}
+
+#let get-size(par) = {
+  if par.invisible {
+    return (width: 0pt, height: 0pt)
+  }
+  let m = measure(box(par.display-name))
+  let w = m.width
+  let h = m.height
+  let (shape-w, shape-h) = (
+    participant: (w + PAR-PAD.last() * 2, h + PAR-PAD.first() * 2),
+    actor: (ACTOR-WIDTH * 1pt, ACTOR-WIDTH * 2pt + SYM-GAP * 1pt + h),
+    boundary: (BOUNDARY-HEIGHT * 2pt, BOUNDARY-HEIGHT * 1pt + SYM-GAP * 1pt + h),
+    control: (CONTROL-HEIGHT * 1pt, CONTROL-HEIGHT * 1pt + SYM-GAP * 1pt + h),
+    entity: (ENTITY-HEIGHT * 1pt, ENTITY-HEIGHT * 1pt + 2pt + SYM-GAP * 1pt + h),
+    database: (DATABASE-WIDTH * 1pt, DATABASE-WIDTH * 4pt / 3 + SYM-GAP * 1pt + h),
+    collections: (
+      w + COLLECTIONS-PAD.last() * 2 + calc.abs(COLLECTIONS-DX) * 1pt,
+      h + COLLECTIONS-PAD.first() * 2 + calc.abs(COLLECTIONS-DY) * 1pt,
+    ),
+    queue: (
+      w + QUEUE-PAD.last() * 2 + 3 * (h + QUEUE-PAD.first() * 2) / 4,
+      h + QUEUE-PAD.first() * 2
+    ),
+    custom: (
+      measure(par.custom-image).width,
+      measure(par.custom-image).height + SYM-GAP * 1pt + h
+    )
+  ).at(par.shape)
+
+  return (
+    width: calc.max(w, shape-w),
+    height: calc.max(h, shape-h)
+  )
+}
+
+#let _render-participant(x, y, p, m, bottom) = {
+  let w = m.width / 1pt
+  let h = m.height / 1pt
+  let x0 = x - w / 2 - PAR-PAD.last() / 1pt
+  let x1 = x + w / 2 + PAR-PAD.last() / 1pt
+  let y0 = y + h + PAR-PAD.first() / 1pt * 2
+  if bottom {
+    y0 = y
+  }
+  let y1 = y0 - h - PAR-PAD.first() / 1pt * 2
+
+  draw.rect(
+    (x0, y0),
+    (x1, y1),
+    radius: 2pt,
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.content(
+    ((x0 + x1) / 2, (y0 + y1) / 2),
+    p.display-name,
+    anchor: "center"
+  )
+}
+
+#let _render-actor(x, y, p, m, bottom) = {
+  let w2 = ACTOR-WIDTH / 2
+  let head-r = ACTOR-WIDTH / 4
+  let height = ACTOR-WIDTH * 2
+  let arms-y = height * 0.375
+
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + height + SYM-GAP}
+  draw.circle(
+    (x, y0 - head-r),
+    radius: head-r,
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.line((x, y0 - head-r * 2), (x, y0 - height + w2), stroke: black + .5pt)
+  draw.line((x - w2, y0 - arms-y), (x + w2, y0 - arms-y), stroke: black + .5pt)
+  draw.line((x - w2, y0 - height), (x, y0 - height + w2), (x + w2, y0 - height), stroke: black + .5pt)
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let _render-boundary(x, y, p, m, bottom) = {
+  let circle-r = BOUNDARY-HEIGHT / 2
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + BOUNDARY-HEIGHT + SYM-GAP}
+  let x0 = x - BOUNDARY-HEIGHT
+  let y1 = y0 - circle-r
+  let y2 = y0 - BOUNDARY-HEIGHT
+
+  draw.circle(
+    (x + circle-r, y1),
+    radius: circle-r,
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.line(
+    (x0, y0), (x0, y2),
+    stroke: black + .5pt
+  )
+  draw.line(
+    (x0, y1), (x, y1),
+    stroke: black + .5pt
+  )
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let _render-control(x, y, p, m, bottom) = {
+  let r = CONTROL-HEIGHT / 2
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + CONTROL-HEIGHT + SYM-GAP}
+
+  draw.circle(
+    (x, y0 - r),
+    radius: r,
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.mark((x, y0), (x - r / 2, y0), symbol: "stealth", fill: black)
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let _render-entity(x, y, p, m, bottom) = {
+  let r = ENTITY-HEIGHT / 2
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + ENTITY-HEIGHT + SYM-GAP}
+  let y1 = y0 - ENTITY-HEIGHT - 1.5
+
+  draw.circle(
+    (x, y0 - r),
+    radius: r,
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.line(
+    (x - r, y1),
+    (x + r, y1),
+    stroke: black + .5pt
+  )
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let _render-database(x, y, p, m, bottom) = {
+  let height = DATABASE-WIDTH * 4 / 3
+  let rx = DATABASE-WIDTH / 2
+  let ry = rx / 2
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + height + SYM-GAP}
+  let y1 = y0 - height
+
+  draw.merge-path(
+    close: true,
+    fill: p.color,
+    stroke: black + .5pt,
+    {
+      draw.bezier((x - rx, y0 - ry), (x, y0), (x - rx, y0 - ry/2), (x - rx/2, y0))
+      draw.bezier((), (x + rx, y0 - ry), (x + rx/2, y0), (x + rx, y0 - ry/2))
+      draw.line((), (x + rx, y1 + ry))
+      draw.bezier((), (x, y1), (x + rx, y1 + ry/2), (x + rx/2, y1))
+      draw.bezier((), (x - rx, y1 + ry), (x - rx/2, y1), (x - rx, y1 + ry/2))
+    }
+  )
+  draw.merge-path(
+    stroke: black + .5pt,
+    {
+      draw.bezier((x - rx, y0 - ry), (x, y0 - ry*2), (x - rx, y0 - 3*ry/2), (x - rx/2, y0 - ry*2))
+      draw.bezier((), (x + rx, y0 - ry), (x + rx/2, y0 - ry*2), (x + rx, y0 - 3*ry/2))
+    }
+  )
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let _render-collections(x, y, p, m, bottom) = {
+  let w = m.width / 1pt
+  let h = m.height / 1pt
+  let dx = COLLECTIONS-DX
+  let dy = COLLECTIONS-DY
+  let total-w = w + PAR-PAD.last() * 2 / 1pt + calc.abs(dx)
+  let total-h = h + PAR-PAD.first() * 2 / 1pt + calc.abs(dy)
+
+  let x0 = x - total-w / 2
+  let x1 = x0 + calc.abs(dx)
+  let x3 = x0 + total-w
+  let x2 = x3 - calc.abs(dx)
+  
+  let y0 = if bottom {y} else {y + total-h}
+  let y1 = y0 - calc.abs(dy)
+  let y3 = y0 - total-h
+  let y2 = y3 + calc.abs(dy)
+
+  let r1 = (x1, y0, x3, y2)
+  let r2 = (x0, y1, x2, y3)
+
+  if dx < 0 {
+    r1.at(0) = x0
+    r1.at(2) = x2
+    r2.at(0) = x1
+    r2.at(2) = x3
+  }
+
+  if dy < 0 {
+    r1.at(1) = y1
+    r1.at(3) = y3
+    r2.at(1) = y0
+    r2.at(3) = y2
+  }
+  draw.rect(
+    (r1.at(0), r1.at(1)),
+    (r1.at(2), r1.at(3)),
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  draw.rect(
+    (r2.at(0), r2.at(1)),
+    (r2.at(2), r2.at(3)),
+    fill: p.color,
+    stroke: black + .5pt
+  )
+  
+  draw.content(
+    ((r2.at(0) + r2.at(2)) / 2, (r2.at(1) + r2.at(3)) / 2),
+    p.display-name,
+    anchor: "center"
+  )
+}
+
+#let _render-queue(x, y, p, m, bottom) = {
+  let w = (m.width + QUEUE-PAD.last() * 2) / 1pt
+  let h = (m.height + QUEUE-PAD.first() * 2) / 1pt
+  let total-h = h
+  let ry = total-h / 2
+  let rx = ry / 2
+  let total-w = w + 3 + 3 * rx
+
+  let x0 = x - total-w / 2
+  let y0 = if bottom {y} else {y + total-h}
+  let y1 = y0 - total-h
+  let x-left = x0 + rx
+  let x-right = x-left + w + rx
+  draw.merge-path(
+    close: true,
+    fill: p.color,
+    stroke: black + .5pt,
+    {
+      draw.bezier((x-right, y0), (x-right + rx, y0 - ry), (x-right + rx/2, y0), (x-right + rx, y0 - ry/2))
+      draw.bezier((), (x-right, y1), (x-right + rx, y1 + ry/2), (x-right + rx/2, y1))
+      draw.line((), (x-left, y1))
+      draw.bezier((), (x-left - rx, y0 - ry), (x-left - rx/2, y1), (x-left - rx, y1 + ry/2))
+      draw.bezier((), (x-left, y0), (x-left - rx, y0 - ry/2), (x-left - rx/2, y0))
+    }
+  )
+  draw.merge-path(
+    stroke: black + .5pt,
+    {
+      draw.bezier((x-right, y0), (x-right - rx, y0 - ry), (x-right - rx/2, y0), (x-right - rx, y0 - ry/2))
+      draw.bezier((), (x-right, y1), (x-right - rx, y1 + ry/2), (x-right - rx/2, y1))
+    }
+  )
+  draw.content(
+    ((x-left + x-right - rx) / 2, y0 - ry),
+    p.display-name,
+    anchor: "center"
+  )
+}
+
+#let _render-custom(x, y, p, m, bottom) = {
+  let image-m = measure(p.custom-image)
+  let y0 = if bottom {y - m.height / 1pt - SYM-GAP} else {y + m.height / 1pt + image-m.height / 1pt + SYM-GAP}
+  draw.content((x - image-m.width / 2pt, y0), p.custom-image, anchor: "north-west")
+  draw.content(
+    (x, y),
+    p.display-name,
+    anchor: if bottom {"north"} else {"south"}
+  )
+}
+
+#let render(x-pos, p, y: 0, bottom: false) = {
+  let m = measure(box(p.display-name))
+  let func = (
+    participant: _render-participant,
+    actor: _render-actor,
+    boundary: _render-boundary,
+    control: _render-control,
+    entity: _render-entity,
+    database: _render-database,
+    collections: _render-collections,
+    queue: _render-queue,
+    custom: _render-custom,
+  ).at(p.shape)
+  func(x-pos.at(p.i), y, p, m, bottom)
+}

src/renderer.typ

@@ -1,20 +1,36 @@
 #import "@preview/cetz:0.2.2": canvas, draw
+#import "utils.typ": get-participants-i, get-style, normalize-units
+#import "group.typ"
+#import "participant.typ"
+#import participant: PAR-SPECIALS
+#import "sequence.typ"
+#import "separator.typ"
+#import "sync.typ"
+#import "consts.typ": *
+#import "note.typ" as note: get-note-box
 
-#let Y-SPACE = 20
-#let PAR-PAD = (5pt, 3pt)
-#let PAR-SPACE = 10
-
-#let get-participants-i(participants) = {
-  let pars-i = (:)
-  for (i, p) in participants.enumerate() {
-    pars-i.insert(p.name, i)
-  }
-  return pars-i
-}
+#let DEBUG-INVISIBLE = false
 
 #let get-columns-width(participants, elements) = {
+  participants = participants.map(p => {
+    p.insert("lifeline-lvl", 0)
+    p.insert("max-lifelines", 0)
+    p
+  })
   let pars-i = get-participants-i(participants)
   let cells = ()
+
+  // Unwrap syncs
+  let i = 0
+  while i < elements.len() {
+    let elmt = elements.at(i)
+    if elmt.type == "sync" {
+      elements = elements.slice(0, i + 1) + elmt.elmts + elements.slice(i + 1)
+    }
+    i += 1
+  }
+
+  // Compute max lifeline levels
   for elmt in elements {
     if elmt.type == "seq" {
       let com = if elmt.comment == none {""} else {elmt.comment}
@@ -28,26 +44,134 @@
           cell: box(com, inset: 3pt)
         )
       )
+
+      if elmt.disable-src or elmt.destroy-src {
+        let p = participants.at(i1)
+        p.lifeline-lvl -= 1
+        participants.at(i1) = p
+      }
+      if elmt.disable-dst {
+        let p = participants.at(i2)
+        p.lifeline-lvl -= 1
+        participants.at(i2) = p
+      }
+      if elmt.enable-dst {
+        let p = participants.at(i2)
+        p.lifeline-lvl += 1
+        p.max-lifelines = calc.max(p.max-lifelines, p.lifeline-lvl)
+        participants.at(i2) = p
+      }
+    } else if elmt.type == "evt" {
+      let par-name = elmt.participant
+      let i = pars-i.at(par-name)
+      let par = participants.at(i)
+      if elmt.event == "disable" or elmt.event == "destroy" {
+        par.lifeline-lvl -= 1
+      
+      } else if elmt.event == "enable" {
+        par.lifeline-lvl += 1
+        par.max-lifelines = calc.max(par.max-lifelines, par.lifeline-lvl)
+      }
+      participants.at(i) = par
+    
+    } else if elmt.type == "note" {
+      let (p1, p2) = (none, none)
+      let cell = none
+      if elmt.side == "left" {
+        p1 = "["
+        p2 = elmt.pos
+        cell = get-note-box(elmt)
+      } else if elmt.side == "right" {
+        p1 = elmt.pos
+        p2 = "]"
+        cell = get-note-box(elmt)
+      } else if elmt.side == "over" {
+        if elmt.aligned-with != none {
+          let box1 = get-note-box(elmt)
+          let box2 = get-note-box(elmt.aligned-with)
+          let m1 = measure(box1)
+          let m2 = measure(box2)
+          cell = box(width: (m1.width + m2.width) / 2, height: calc.max(m1.height, m2.height))
+          p1 = elmt.pos
+          p2 = elmt.aligned-with.pos
+        }
+      }
+
+      if p1 != none and p2 != none and cell != none {
+        let i1 = pars-i.at(p1)
+        let i2 = pars-i.at(p2)
+        cells.push(
+          (
+            elmt: elmt,
+            i1: calc.min(i1, i2),
+            i2: calc.max(i1, i2),
+            cell: cell
+          )
+        )
+      }
     }
   }
 
+  // Compute column widths
+  // Compute minimum widths for participant names and shapes
   let widths = ()
   for i in range(participants.len() - 1) {
     let p1 = participants.at(i)
     let p2 = participants.at(i + 1)
-    let w1 = measure(box(p1.display-name)).width + PAR-PAD.last() * 2
-    let w2 = measure(box(p2.display-name)).width + PAR-PAD.last() * 2
+    let m1 = participant.get-size(p1)
+    let m2 = participant.get-size(p2)
+    let w1 = m1.width
+    let w2 = m2.width
     widths.push(w1 / 2pt + w2 / 2pt + PAR-SPACE)
   }
 
+  // Compute minimum width for over notes
+  for n in elements.filter(e => (e.type == "note" and
+                                 e.side == "over" and 
+                                 type(e.pos) == str)) {
+    
+    let m = note.get-size(n)
+    let i = pars-i.at(n.pos)
+
+    if i < widths.len() {
+      widths.at(i) = calc.max(
+        widths.at(i),
+        m.width / 2 + NOTE-GAP
+      )
+    }
+    if i > 0 {
+      widths.at(i - 1) = calc.max(
+        widths.at(i - 1),
+        m.width / 2 + NOTE-GAP
+      )
+    }
+  }
+
+  // Compute minimum width for simple sequences (spanning 1 column)
   for cell in cells.filter(c => c.i2 - c.i1 == 1) {
     let m = measure(cell.cell)
     widths.at(cell.i1) = calc.max(
       widths.at(cell.i1),
-      m.width / 1pt
+      m.width / 1pt + COMMENT-PAD
     )
   }
 
+  // Compute minimum width for self sequences
+  for cell in cells.filter(c => c.elmt.type == "seq" and c.i1 == c.i2) {
+    let m = measure(cell.cell)
+    let i = cell.i1
+    if cell.elmt.flip {
+      i -= 1
+    }
+    if 0 <= i and i < widths.len() {
+      widths.at(i) = calc.max(
+        widths.at(i),
+        m.width / 1pt + COMMENT-PAD
+      )
+    }
+  }
+
+  // Compute remaining widths for longer sequences (spanning multiple columns)
   let multicol-cells = cells.filter(c => c.i2 - c.i1 > 1)
   multicol-cells = multicol-cells.sorted(key: c => {
     c.i1 * 1000 + c.i2
@@ -56,82 +180,340 @@
     let m = measure(cell.cell)
     widths.at(cell.i2 - 1) = calc.max(
       widths.at(cell.i2 - 1),
-      m.width / 1pt - widths.slice(0, cell.i2 - 1).sum()
+      m.width / 1pt + COMMENT-PAD - widths.slice(cell.i1, cell.i2 - 1).sum()
     )
   }
+
+  // Add lifeline widths
+  for (i, w) in widths.enumerate() {
+    let p1 = participants.at(i)
+    let p2 = participants.at(i + 1)
+    let w = w + p1.max-lifelines * LIFELINE-W / 2
+    if p2.max-lifelines != 0 {
+      w += LIFELINE-W / 2
+    }
+    widths.at(i) = w
+  }
+
+  for elmt in elements {
+    if elmt.type == "col" {
+      let i1 = pars-i.at(elmt.p1)
+      let i2 = pars-i.at(elmt.p2)
+      if calc.abs(i1 - i2) != 1 {
+        let i-min = calc.min(i1, i2)
+        let i-max = calc.max(i1, i2)
+        let others = pars-i.pairs()
+                           .sorted(key: p => p.last())
+                           .slice(i-min + 1, i-max)
+                           .map(p => "'" + p.first() + "'")
+                           .join(", ")
+        panic(
+          "Column participants must be consecutive (participants (" +
+          others +
+          ") are in between)"
+        )
+      }
+      let i = calc.min(i1, i2)
+
+      if elmt.width != auto {
+        widths.at(i) = normalize-units(elmt.width)
+      }
+      widths.at(i) = calc.max(
+        widths.at(i),
+        normalize-units(elmt.min-width)
+      ) + normalize-units(elmt.margin)
+    }
+  }
+
   return widths
 }
 
 #let render(participants, elements) = context canvas(length: 1pt, {
+  let shapes = ()
   let pars-i = get-participants-i(participants)
 
   let widths = get-columns-width(participants, elements)
 
+  // Compute each column's X position
   let x-pos = (0,)
   for width in widths {
     x-pos.push(x-pos.last() + width)
   }
+
+  let draw-seq = sequence.render.with(pars-i, x-pos, participants)
+  let draw-group = group.render.with()
+  let draw-else = group.render-else.with()
+  let draw-sep = separator.render.with(x-pos)
+  let draw-par = participant.render.with(x-pos)
+  let draw-note = note.render.with(pars-i, x-pos)
+  let draw-sync = sync.render.with(pars-i, x-pos, participants)
   
-  // Draw participants
-  for (i, p) in participants.enumerate() {
-    draw.content(
-      (x-pos.at(i), 0),
-      p.display-name,
-      name: p.name,
-      frame: "rect",
-      padding: PAR-PAD,
-      anchor: "south"
-    )
+  // Draw participants (start)
+  for p in participants {
+    if p.from-start and not p.invisible and p.show-top {
+      shapes += draw-par(p)
+    }
   }
 
-  let y = -Y-SPACE
-  // Draw sequences
+  let y = 0
+  let groups = ()
+  let lifelines = participants.map(_ => (
+    level: 0,
+    lines: ()
+  ))
+
+  // Draw elemnts
   for elmt in elements {
+    // Sequences
     if elmt.type == "seq" {
-      let x1 = x-pos.at(pars-i.at(elmt.p1))
-      let x2 = x-pos.at(pars-i.at(elmt.p2))
-      let style = (
-        mark: (end: "straight"),
-        stroke: (
-          dash: if elmt.dashed {"dashed"} else {"solid"},
-          paint: elmt.color
+      let shps
+      (y, lifelines, shps) = draw-seq(elmt, y, lifelines)
+      shapes += shps
+
+    // Groups (start) -> reserve space for labels + store position
+    } else if elmt.type == "grp" {
+      y -= Y-SPACE
+      let m = measure(
+        box(
+          elmt.name,
+          inset: (left: 5pt, right: 5pt, top: 3pt, bottom: 3pt),
         )
       )
+      groups = groups.map(g => {
+        if g.at(1).min-i == elmt.min-i { g.at(2) += 1 }
+        if g.at(1).max-i == elmt.max-i { g.at(3) += 1 }
+        g
+      })
+      if elmt.grp-type == "alt" {
+        elmt.insert("elses", ())
+      }
+      groups.push((y, elmt, 0, 0))
+      y -= m.height / 1pt
+    
+    // Groups (end) -> actual drawing
+    } else if elmt.type == "grp-end" {
+      y -= Y-SPACE
+      let (start-y, group, start-lvl, end-lvl) = groups.pop()
+      let x0 = x-pos.at(group.min-i) - start-lvl * 10 - 20
+      let x1 = x-pos.at(group.max-i) + end-lvl * 10 + 20
+      shapes += draw-group(x0, x1, start-y, y, group)
 
-      draw.line(
-        (x1, y),
-        (x2, y),
-        ..style
-      )
-      if elmt.comment != none {
-        draw.content(
-          (calc.min(x1, x2), y),
-          elmt.comment,
-          anchor: "south-west",
-          padding: 3pt
+      if group.grp-type == "alt" {
+        for (else-y, else-elmt) in group.elses {
+          shapes += draw-else(x0, x1, else-y, else-elmt)
+        }
+      }
+
+    // Alt's elses -> reserve space for label + store position
+    } else if elmt.type == "else" {
+      y -= Y-SPACE
+      let m = measure(text([\[#elmt.desc\]], weight: "bold", size: .8em))
+      groups.last().at(1).elses.push((
+        y, elmt
+      ))
+      y -= m.height / 1pt
+
+    // Separator
+    } else if elmt.type == "sep" {
+      let shps
+      (y, shps) = draw-sep(elmt, y)
+      shapes += shps
+    
+    // Gap
+    } else if elmt.type == "gap" {
+      y -= elmt.size
+
+    // Delay
+    } else if elmt.type == "delay" {
+      let y0 = y
+      let y1 = y - elmt.size
+      for (i, line) in lifelines.enumerate() {
+        line.lines.push(("delay-start", y0))
+        line.lines.push(("delay-end", y1))
+        lifelines.at(i) = line
+      }
+      if elmt.name != none {
+        let x0 = x-pos.first()
+        let x1 = x-pos.last()
+        shapes += draw.content(
+          ((x0 + x1) / 2, (y0 + y1) / 2),
+          anchor: "center",
+          elmt.name
         )
       }
-      y -= Y-SPACE
+      y = y1
+    
+    // Event
+    } else if elmt.type == "evt" {
+      let par-name = elmt.participant
+      let i = pars-i.at(par-name)
+      let par = participants.at(i)
+      let line = lifelines.at(i)
+      if elmt.event == "disable" {
+        line.level -= 1
+        line.lines.push(("disable", y))
+      
+      } else if elmt.event == "destroy" {
+        line.lines.push(("destroy", y))
+      
+      } else if elmt.event == "enable" {
+        line.level += 1
+        line.lines.push(("enable", y, elmt.lifeline-style))
+      
+      } else if elmt.event == "create" {
+        y -= CREATE-OFFSET
+        shapes += participant.render(x-pos, par, y: y)
+        line.lines.push(("create", y))
+      }
+      lifelines.at(i) = line
+    
+    // Note
+    } else if elmt.type == "note" {
+      if not elmt.linked {
+        if not elmt.aligned {
+          y -= Y-SPACE
+        }
+        let shps
+        (y, shps) = draw-note(elmt, y, lifelines)
+        shapes += shps
+      }
+
+    // Synched sequences
+    } else if elmt.type == "sync" {
+      let shps
+      (y, lifelines, shps) = draw-sync(elmt, y, lifelines)
+      shapes += shps
     }
   }
 
-  // Draw vertical lines + end participants
-  draw.on-layer(-1, {
-    for (i, p) in participants.enumerate() {
-      let x = x-pos.at(i)
+  y -= Y-SPACE
+
+  // Draw vertical lines + lifelines + end participants
+  shapes += draw.on-layer(-1, {
+    if DEBUG-INVISIBLE {
+      for p in participants.filter(p => p.invisible) {
+        let color = if p.name.starts-with("?") {green} else if p.name.ends-with("?") {red} else {blue}
+        let x = x-pos.at(p.i)
+        draw.line(
+          (x, 0),
+          (x, y),
+          stroke: (paint: color, dash: "dotted")
+        )
+        draw.content(
+          (x, 0),
+          p.display-name,
+          anchor: "west",
+          angle: 90deg
+        )
+      }
+    }
+    
+    for p in participants.filter(p => not p.invisible) {
+      let x = x-pos.at(p.i)
+
+      // Draw vertical line
+      let last-y = 0
+
+      let rects = ()
+      let destructions = ()
+      let lines = ()
+
+      // Compute lifeline rectangles + destruction positions
+      for line in lifelines.at(p.i).lines {
+        let event = line.first()
+        if event == "create" {
+          last-y = line.at(1)
+
+        } else if event == "enable" {
+          if lines.len() == 0 {
+            draw.line(
+              (x, last-y),
+              (x, line.at(1)),
+              stroke: (
+                dash: "dashed",
+                paint: gray.darken(40%),
+                thickness: .5pt
+              )
+            )
+          }
+          lines.push(line)
+        
+        } else if event == "disable" or event == "destroy" {
+          let lvl = 0
+          if lines.len() != 0 {
+            let l = lines.pop()
+            lvl = lines.len()
+            rects.push((
+              x + lvl * LIFELINE-W / 2,
+              l.at(1),
+              line.at(1),
+              l.at(2)
+            ))
+            last-y = line.at(1)
+          }
+
+          if event == "destroy" {
+            destructions.push((x + lvl * LIFELINE-W / 2, line.at(1)))
+          }
+        } else if event == "delay-start" {
+          draw.line(
+            (x, last-y),
+            (x, line.at(1)),
+            stroke: (
+              dash: "dashed",
+              paint: gray.darken(40%),
+              thickness: .5pt
+            )
+          )
+          last-y = line.at(1)
+        } else if event == "delay-end" {
+          draw.line(
+            (x, last-y),
+            (x, line.at(1)),
+            stroke: (
+              dash: "loosely-dotted",
+              paint: gray.darken(40%),
+              thickness: .8pt
+            )
+          )
+          last-y = line.at(1)
+        }
+      }
+
       draw.line(
-        (x, 0),
+        (x, last-y),
         (x, y),
-        stroke: (dash: "dashed", paint: gray.darken(40%))
-      )
-      draw.content(
-        (x, y),
-        p.display-name,
-        name: p.name,
-        frame: "rect",
-        padding: PAR-PAD,
-        anchor: "north"
+        stroke: (
+          dash: "dashed",
+          paint: gray.darken(40%),
+          thickness: .5pt
+        )
       )
+
+      // Draw lifeline rectangles (reverse for bottom to top)
+      for rect in rects.rev() {
+        let (cx, y0, y1, style) = rect
+        let style = get-style("lifeline", style)
+        draw.rect(
+          (cx - LIFELINE-W / 2, y0),
+          (cx + LIFELINE-W / 2, y1),
+          ..style
+        )
+      }
+
+      // Draw lifeline destructions
+      for dest in destructions {
+        let (cx, cy) = dest
+        draw.line((cx - 8, cy - 8), (cx + 8, cy + 8), stroke: COL-DESTRUCTION + 2pt)
+        draw.line((cx - 8, cy + 8), (cx + 8, cy - 8), stroke: COL-DESTRUCTION + 2pt)
+      }
+
+      // Draw participants (end)
+      if p.show-bottom {
+        draw-par(p, y: y, bottom: true)
+      }
     }
   })
+
+  shapes
 })

src/separator.typ

@@ -0,0 +1,63 @@
+#import "@preview/cetz:0.2.2": draw
+#import "consts.typ": *
+
+#let _sep(name) = {
+  return ((
+    type: "sep",
+    name: name
+  ),)
+}
+
+#let _delay(name: none, size: 30) = {
+  return ((
+    type: "delay",
+    name: name,
+    size: size
+  ),)
+}
+
+#let render(x-pos, elmt, y) = {
+  let shapes = ()
+  y -= Y-SPACE
+
+  let x0 = x-pos.first() - 20
+  let x1 = x-pos.last() + 20
+  let m = measure(
+    box(
+      elmt.name,
+      inset: (left: 3pt, right: 3pt, top: 5pt, bottom: 5pt)
+    )
+  )
+  let w = m.width / 1pt
+  let h = m.height / 1pt
+  let cx = (x0 + x1) / 2
+  let xl = cx - w / 2
+  let xr = cx + w / 2
+
+  y -= h / 2
+  shapes += draw.rect(
+    (x0, y),
+    (x1, y - 3),
+    stroke: none,
+    fill: white
+  )
+  shapes += draw.line((x0, y), (x1, y))
+  //shapes += draw.line((x0, y), (xl, y))
+  //shapes += draw.line((xr, y), (x1, y))
+  y -= 3
+  shapes += draw.line((x0, y), (x1, y))
+  //shapes += draw.line((x0, y), (xl, y))
+  //shapes += draw.line((xr, y), (x1, y))
+  shapes += draw.content(
+    ((x0 + x1) / 2, y + 1.5),
+    elmt.name,
+    anchor: "center",
+    padding: (5pt, 3pt),
+    frame: "rect",
+    fill: COL-SEP-NAME
+  )
+  y -= h / 2
+
+  let r = (y, shapes)
+  return r
+}

src/sequence.typ

@@ -0,0 +1,380 @@
+#import "@preview/cetz:0.2.2": draw, vector
+#import "consts.typ": *
+#import "participant.typ"
+#import "note.typ"
+
+#let get-arrow-marks(sym, color) = {
+  if sym == none {
+    return none
+  }
+  if type(sym) == array {
+    return sym.map(s => get-arrow-marks(s, color))
+  }
+  (
+    "": none,
+    ">": (symbol: ">", fill: color),
+    ">>": (symbol: "straight"),
+    "\\": (symbol: ">", fill: color, harpoon: true, flip: true),
+    "\\\\": (symbol: "straight", harpoon: true, flip: true),
+    "/": (symbol: ">", fill: color, harpoon: true),
+    "//": (symbol: "straight", harpoon: true),
+    "x": none,
+    "o": none,
+  ).at(sym)
+}
+
+#let reverse-arrow-mark(mark) = {
+  if type(mark) == array {
+    return mark.map(m => reverse-arrow-mark(m))
+  }
+  let mark2 = mark
+  if type(mark) == dictionary and mark.at("harpoon", default: false) {
+    let flipped = mark.at("flip", default: false)
+    mark2.insert("flip", not flipped)
+  }
+  return mark2
+}
+
+#let is-tip-of-type(type_, tip) = {
+  if type(tip) == str and tip == type_ {
+    return true
+  }
+  if type(tip) == array and tip.contains(type_) {
+    return true
+  }
+  return false
+}
+#let is-circle-tip = is-tip-of-type.with("o")
+#let is-cross-tip = is-tip-of-type.with("x")
+
+#let _seq(
+  p1,
+  p2,
+  comment: none,
+  comment-align: "left",
+  dashed: false,
+  start-tip: "",
+  end-tip: ">",
+  color: black,
+  flip: false,
+  enable-dst: false,
+  create-dst: false,
+  disable-dst: false,
+  destroy-dst: false,
+  disable-src: false,
+  destroy-src: false,
+  lifeline-style: auto,
+  slant: none
+) = {
+  return ((
+    type: "seq",
+    p1: p1,
+    p2: p2,
+    comment: comment,
+    comment-align: comment-align,
+    dashed: dashed,
+    start-tip: start-tip,
+    end-tip: end-tip,
+    color: color,
+    flip: flip,
+    enable-dst: enable-dst,
+    create-dst: create-dst,
+    disable-dst: disable-dst,
+    destroy-dst: destroy-dst,
+    disable-src: disable-src,
+    destroy-src: destroy-src,
+    lifeline-style: lifeline-style,
+    slant: slant
+  ),)
+}
+
+#let _ret(comment: none) = {
+  return ((
+    type: "ret",
+    comment: comment
+  ),)
+}
+
+#let render(pars-i, x-pos, participants, elmt, y, lifelines) = {
+  let shapes = ()
+
+  y -= Y-SPACE
+
+  let h = 0
+  // Reserve space for comment
+  if elmt.comment != none {
+    h = calc.max(h, measure(box(elmt.comment)).height / 1pt + 6)
+  }
+  if "linked-note" in elmt {
+    h = calc.max(h, note.get-size(elmt.linked-note).height / 2)
+  }
+  y -= h
+
+  let i1 = pars-i.at(elmt.p1)
+  let i2 = pars-i.at(elmt.p2)
+
+  let start-info = (
+    i: i1,
+    x: x-pos.at(i1),
+    y: y,
+    ll-lvl: lifelines.at(i1).level * LIFELINE-W / 2
+  )
+  let end-info = (
+    i: i2,
+    x: x-pos.at(i2),
+    y: y,
+    ll-lvl: lifelines.at(i2).level * LIFELINE-W / 2
+  )
+  let slant = if elmt.slant == auto {
+    DEFAULT-SLANT
+  } else if elmt.slant != none {
+    elmt.slant
+  } else {
+    0
+  }
+  end-info.y -= slant
+  if elmt.p1 == elmt.p2 {
+    end-info.y -= 10
+  }
+
+  if elmt.disable-src {
+    let src-line = lifelines.at(i1)
+    src-line.level -= 1
+    src-line.lines.push(("disable", start-info.y))
+    lifelines.at(i1) = src-line
+  }
+  if elmt.destroy-src {
+    let src-line = lifelines.at(i1)
+    src-line.lines.push(("destroy", start-info.y))
+    lifelines.at(i1) = src-line
+  }
+  if elmt.disable-dst {
+    let dst-line = lifelines.at(i2)
+    dst-line.level -= 1
+    dst-line.lines.push(("disable", end-info.y))
+    lifelines.at(i2) = dst-line
+  }
+  if elmt.destroy-dst {
+    let dst-line = lifelines.at(i2)
+    dst-line.lines.push(("destroy", end-info.y))
+    lifelines.at(i2) = dst-line
+  }
+  if elmt.enable-dst {
+    let dst-line = lifelines.at(i2)
+    dst-line.level += 1
+    lifelines.at(i2) = dst-line
+  }
+  if elmt.create-dst {
+    let par = participants.at(i2)
+    let m = measure(box(par.display-name))
+    let f = if i1 > i2 {-1} else {1}
+    end-info.x -= (m.width + PAR-PAD.last() * 2) / 2pt * f
+    shapes += participant.render(x-pos, par, y: end-info.y - CREATE-OFFSET)
+  }
+
+  end-info.ll-lvl = lifelines.at(i2).level * LIFELINE-W / 2
+
+  // Compute left/right position at start/end
+  start-info.insert("lx", start-info.x)
+  if start-info.ll-lvl != 0 { start-info.lx -= LIFELINE-W / 2 }
+  end-info.insert("lx", end-info.x)
+  if end-info.ll-lvl != 0 { end-info.lx -= LIFELINE-W / 2 }
+
+  start-info.insert("rx", start-info.x + start-info.ll-lvl)
+  end-info.insert("rx", end-info.x + end-info.ll-lvl)
+
+  // Choose correct points to link
+  let x1 = start-info.rx
+  let x2 = end-info.lx
+
+  if (start-info.i > end-info.i) {
+    x1 = start-info.lx
+    x2 = end-info.rx
+  }
+
+  let style = (
+    mark: (
+      start: get-arrow-marks(elmt.start-tip, elmt.color),
+      end: get-arrow-marks(elmt.end-tip, elmt.color),
+      scale: 1.2
+    ),
+    stroke: (
+      dash: if elmt.dashed {(2pt,2pt)} else {"solid"},
+      paint: elmt.color,
+      thickness: .5pt
+    )
+  )
+
+  let y0 = start-info.y
+  if "linked-note" in elmt {
+    let shps = note.render(pars-i, x-pos, elmt.linked-note, start-info.y, lifelines).last()
+    shapes += shps
+  }
+
+  let flip-mark = end-info.i <= start-info.i
+  if elmt.flip {
+    flip-mark = not flip-mark
+  }
+  if flip-mark {
+    style.mark.end = reverse-arrow-mark(style.mark.end)
+  }
+
+  let pts
+  let comment-pt
+  let comment-anchor
+  let comment-angle = 0deg
+
+  if elmt.p1 == elmt.p2 {
+    if elmt.flip {
+      x1 = start-info.lx
+    } else {
+      x2 = end-info.rx
+    }
+
+    let x-mid = if elmt.flip {
+      calc.min(x1, x2) - 20
+    } else {
+      calc.max(x1, x2) + 20
+    }
+
+    pts = (
+      (x1, start-info.y),
+      (x-mid, start-info.y),
+      (x-mid, end-info.y),
+      (x2, end-info.y)
+    )
+
+    if elmt.comment != none {
+      comment-anchor = (
+        start: if x-mid < x1 {"south-east"} else {"south-west"},
+        end: if x-mid < x1 {"south-west"} else {"south-east"},
+        left: "south-west",
+        right: "south-east",
+        center: "south",
+      ).at(elmt.comment-align)
+
+      comment-pt = (
+        start: pts.first(),
+        end: pts.at(1),
+        left: if x-mid < x1 {pts.at(1)} else {pts.first()},
+        right: if x-mid < x1 {pts.first()} else {pts.at(1)},
+        center: (pts.first(), 50%, pts.at(1))
+      ).at(elmt.comment-align)
+    }
+
+  } else {
+    pts = (
+      (x1, start-info.y),
+      (x2, end-info.y)
+    )
+
+    if elmt.comment != none {
+      let start-pt = pts.first()
+      let end-pt = pts.last()
+      if elmt.start-tip != "" {
+        start-pt = (pts.first(), COMMENT-PAD, pts.last())
+      }
+      if elmt.end-tip != "" {
+        end-pt = (pts.last(), COMMENT-PAD, pts.first())
+      }
+
+      comment-pt = (
+        start: start-pt,
+        end: end-pt,
+        left: if x2 < x1 {end-pt} else {start-pt},
+        right: if x2 < x1 {start-pt} else {end-pt},
+        center: (start-pt, 50%, end-pt)
+      ).at(elmt.comment-align)
+
+      comment-anchor = (
+        start: if x2 < x1 {"south-east"} else {"south-west"},
+        end: if x2 < x1 {"south-west"} else {"south-east"},
+        left: "south-west",
+        right: "south-east",
+        center: "south",
+      ).at(elmt.comment-align)
+    }
+
+    let (p1, p2) = pts
+    if x2 < x1 {
+      (p1, p2) = (p2, p1)
+    }
+    comment-angle = vector.angle2(p1, p2)
+  }
+
+  // Start circle tip
+  if is-circle-tip(elmt.start-tip) {
+    shapes += draw.circle(pts.first(), radius: CIRCLE-TIP-RADIUS, stroke: none, fill: elmt.color, name: "_circle-start-tip")
+    pts.at(0) = "_circle-start-tip"
+  
+  // Start cross tip
+  } else if is-cross-tip(elmt.start-tip) {
+    let size = CROSS-TIP-SIZE
+    let cross-pt = (pts.first(), size * 2, pts.at(1))
+    shapes += draw.line(
+      (rel: (-size, -size), to: cross-pt),
+      (rel: (size, size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    shapes += draw.line(
+      (rel: (-size, size), to: cross-pt),
+      (rel: (size, -size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    pts.at(0) = cross-pt
+  }
+
+  // End circle tip
+  if is-circle-tip(elmt.end-tip) {
+    shapes += draw.circle(pts.last(), radius: 3, stroke: none, fill: elmt.color, name: "_circle-end-tip")
+    pts.at(pts.len() - 1) = "_circle-end-tip"
+  
+  // End cross tip
+  } else if is-cross-tip(elmt.end-tip) {
+    let size = CROSS-TIP-SIZE
+    let cross-pt = (pts.last(), size * 2, pts.at(pts.len() - 2))
+    shapes += draw.line(
+      (rel: (-size, -size), to: cross-pt),
+      (rel: (size, size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    shapes += draw.line(
+      (rel: (-size, size), to: cross-pt),
+      (rel: (size, -size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    pts.at(pts.len() - 1) = cross-pt
+  }
+
+  shapes += draw.line(..pts, ..style)
+
+  if elmt.comment != none {
+    shapes += draw.content(
+      comment-pt,
+      elmt.comment,
+      anchor: comment-anchor,
+      angle: comment-angle,
+      padding: 3pt
+    )
+  }
+
+  if elmt.enable-dst {
+    let dst-line = lifelines.at(i2)
+    dst-line.lines.push(("enable", end-info.y, elmt.lifeline-style))
+    lifelines.at(i2) = dst-line
+  }
+  if elmt.create-dst {
+    end-info.y -= CREATE-OFFSET
+    let dst-line = lifelines.at(i2)
+    dst-line.lines.push(("create", end-info.y))
+    lifelines.at(i2) = dst-line
+  }
+
+  if "linked-note" in elmt {
+    let m = note.get-size(elmt.linked-note)
+    end-info.y = calc.min(end-info.y, y0 - m.height / 2)
+  }
+
+  let r = (end-info.y, lifelines, shapes)
+  return r
+}

src/sync.typ

@@ -0,0 +1,27 @@
+#import "sequence.typ"
+
+#let _sync(elmts) = {
+  return ((
+    type: "sync",
+    elmts: elmts
+  ),)
+}
+
+#let render(pars-i, x-pos, participants, elmt, y, lifelines) = {
+  let draw-seq = sequence.render.with(pars-i, x-pos, participants)
+
+  let shapes = ()
+
+  let end-y = y
+
+  for e in elmt.elmts {
+    let yi
+    let shps
+    (yi, lifelines, shps) = draw-seq(e, y, lifelines)
+    shapes += shps
+    end-y = calc.min(end-y, yi)
+  }
+
+  let r = (end-y, lifelines, shapes)
+  return r
+}

src/utils.typ

@@ -0,0 +1,79 @@
+#let normalize-units(value) = {
+  if type(value) == int or type(value) == float {
+    return value
+  }
+  if type(value) == length {
+    return value / 1pt
+  }
+  panic("Unsupported type '" + str(type(value)) + "'")
+}
+#let get-participants-i(participants) = {
+  let pars-i = (:)
+  for (i, p) in participants.enumerate() {
+    pars-i.insert(p.name, i)
+  }
+  return pars-i
+}
+
+#let get-group-span(participants, group) = {
+  let min-i = participants.len() - 1
+  let max-i = 0
+  let pars-i = get-participants-i(participants)
+
+  for elmt in group.elmts {
+    if elmt.type == "seq" {
+      let i1 = pars-i.at(elmt.p1)
+      let i2 = pars-i.at(elmt.p2)
+      min-i = calc.min(min-i, i1, i2)
+      max-i = calc.max(max-i, i1, i2)
+    } else if elmt.type == "grp" {
+      let (i0, i1) = get-group-span(participants, elmt)
+      min-i = calc.min(min-i, i0)
+      max-i = calc.max(max-i, i1)
+    } else if elmt.type == "sync" {
+      let (i0, i1) = get-group-span(participants, elmt)
+      min-i = calc.min(min-i, i0)
+      max-i = calc.max(max-i, i1)
+    }
+  }
+  return (min-i, max-i)
+}
+
+#let get-style(base-name, mods) = {
+  let style = if base-name == "lifeline" {(
+    fill: white,
+    stroke: black + 1pt
+  )}
+
+  if mods == auto {
+    return style
+  }
+  if type(mods) == dictionary {
+    return style + mods
+  }
+
+  panic("Invalid type for parameter mods, expected auto or dictionary, got " + str(type(mods)))
+}
+
+#let fit-canvas(canvas, width: auto) = layout(size => {
+  let m = measure(canvas)
+  let w = m.width
+  let h = m.height
+  let r = if w == 0pt {0} else {
+    if width == auto {1}
+    else if type(width) == length {
+      width / w
+    } else {
+      size.width * width / w
+    }
+  }
+  let new-w = w * r
+  let new-h = h * r
+  r *= 100%
+  
+  box(
+    width: new-w,
+    height: new-h,
+    scale(x: r, y: r, reflow: true, canvas)
+  )
+})

typst.toml

@@ -1,6 +1,6 @@
 [package]
 name = "chronos"
-version = "0.0.1"
+version = "0.1.1"
 compiler = "0.11.0"
 repository = "https://git.kb28.ch/HEL/chronos"
 entrypoint = "src/lib.typ"
@@ -11,4 +11,4 @@ categories = ["visualization"]
 license = "Apache-2.0"
 description = "A package to draw sequence diagrams with CeTZ"
 keywords = ["sequence", "diagram", "plantuml"]
-exclude = [ "/gallery/*" ]
+exclude = [ "gallery", "gallery.bash", "docs" ]