added basis for lifelines

gallery/example2.typ

@@ -0,0 +1,33 @@
+#import "/src/lib.typ" as chronos
+
+
+#chronos.diagram({
+  import "/src/diagram.typ": *
+  _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, dashed: true)
+  _seq("B", "A", comment: "RequestCreated", disable-src: true, dashed: true)
+  _seq("A", "User", comment: "Done", disable-src: true)
+})
+
+#chronos.diagram({
+  import "/src/diagram.typ": *
+  _seq("User", "A", comment: "DoWork", enable-dst: true)
+  _seq("A", "A", comment: "Internal call", enable-dst: true)
+  _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 "/src/diagram.typ": *
+  _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)
+  _seq("bob", "george", comment: "create", enable-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)
+})

src/diagram.typ

@@ -8,7 +8,12 @@
   dashed: false,
   tip: "default",
   color: black,
-  flip: false
+  flip: false,
+  enable-dst: false,
+  disable-dst: false,
+  destroy-dst: false,
+  disable-src: false,
+  destroy-src: false,
 ) = {
   return ((
     type: "seq",
@@ -18,7 +23,12 @@
     dashed: dashed,
     tip: tip,
     color: color,
-    flip: flip
+    flip: flip,
+    enable-dst: enable-dst,
+    disable-dst: disable-dst,
+    destroy-dst: destroy-dst,
+    disable-src: disable-src,
+    destroy-src: destroy-src,
   ),)
 }
 

src/renderer.typ

@@ -5,9 +5,15 @@
 #let PAR-PAD = (5pt, 3pt)
 #let PAR-SPACE = 10
 #let COMMENT-PAD = 8
+#let LIFELINE-W = 10
 
 
 #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 = ()
   for elmt in elements {
@@ -23,6 +29,23 @@
           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
+      }
     }
   }
 
@@ -54,6 +77,15 @@
       m.width / 1pt - widths.slice(0, cell.i2 - 1).sum()
     )
   }
+  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
+  }
   return widths
 }
 
@@ -119,12 +151,68 @@
 
   let y = -Y-SPACE
   let groups = ()
+  let lifelines = participants.map(_ => (
+    level: 0,
+    lines: ()
+  ))
 
   // Draw sequences
   for elmt in elements {
     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 i1 = pars-i.at(elmt.p1)
+      let i2 = pars-i.at(elmt.p2)
+
+      if elmt.comment != none {
+        y -= measure(box(elmt.comment)).height / 1pt + 6
+      }
+
+      if elmt.disable-src {
+        let src-line = lifelines.at(i1)
+        src-line.level -= 1
+        src-line.lines.push(("disable", y, auto))
+        lifelines.at(i1) = src-line
+      }
+      if elmt.destroy-src {
+        let src-line = lifelines.at(i1)
+        src-line.level -= 1
+        src-line.lines.push(("destroy", y, auto))
+        lifelines.at(i1) = src-line
+      }
+
+      let ll-lvl1 = lifelines.at(i1).level * LIFELINE-W / 2
+
+      if elmt.disable-dst {
+        let dst-line = lifelines.at(i2)
+        dst-line.level -= 1
+        dst-line.lines.push(("disable", y, auto))
+        lifelines.at(i2) = dst-line
+      }
+      if elmt.destroy-dst {
+        let dst-line = lifelines.at(i2)
+        dst-line.level -= 1
+        dst-line.lines.push(("destroy", y, auto))
+        lifelines.at(i2) = dst-line
+      }
+      if elmt.enable-dst {
+        let dst-line = lifelines.at(i2)
+        dst-line.level += 1
+        lifelines.at(i2) = dst-line
+      }
+
+      let x1 = x-pos.at(i1)
+      let x2 = x-pos.at(i2)
+
+      let ll-lvl2 = lifelines.at(i2).level * LIFELINE-W / 2
+
+      let f = if elmt.flip {-1} else {1}
+      if i1 <= i2 {
+        x1 += ll-lvl1 * f
+        x2 -= ll-lvl2 * f
+      } else {
+        x1 -= ll-lvl1 * f
+        x2 += ll-lvl2 * f
+      }
+
       let style = (
         mark: (end: "straight"),
         stroke: (
@@ -134,10 +222,11 @@
       )
 
       if elmt.p1 == elmt.p2 {
+        let x3 = x1 - ll-lvl1 + ll-lvl2
+
         x2 = if elmt.flip {x1 - 20} else {x1 + 20}
 
         if elmt.comment != none {
-          y -= measure(box(elmt.comment)).height / 1pt + 6
           draw.content(
             (x1, y),
             elmt.comment,
@@ -150,7 +239,7 @@
           (x1, y),
           (x2, y),
           (x2, y - 10),
-          (x1, y - 10),
+          (x3, y - 10),
           ..style
         )
         y -= 10
@@ -161,7 +250,6 @@
           if x2 < x1 {
             x += COMMENT-PAD
           }
-          y -= measure(box(elmt.comment)).height / 1pt + 6
           draw.content(
             (x, y),
             elmt.comment,
@@ -176,6 +264,11 @@
           ..style
         )
       }
+      if elmt.enable-dst {
+        let dst-line = lifelines.at(i2)
+        dst-line.lines.push(("enable", y, auto))
+        lifelines.at(i2) = dst-line
+      }
       y -= Y-SPACE
 
     } else if elmt.type == "grp" {
@@ -244,6 +337,37 @@
         (x, y),
         stroke: (dash: "dashed", paint: gray.darken(40%))
       )
+
+      let rects = ()
+      let destructions = ()
+      let lines = ()
+      for line in lifelines.at(i).lines {
+        let event = line.first()
+        if event == "enable" {
+          lines.push(line)
+        } else if event == "disable" or event == "destroy" {
+          let l = lines.pop()
+          let lvl = lines.len()
+          rects.push((x + lvl * LIFELINE-W / 2, l.at(1), line.at(1)))
+          if event == "destroy" {
+            destructions.push((x + lvl * LIFELINE-W / 2, line.at(1)))
+          }
+        }
+      }
+
+      for rect in rects.rev() {
+        let (cx, y0, y1) = rect
+        draw.rect(
+          (cx - LIFELINE-W / 2, y0),
+          (cx + LIFELINE-W / 2, y1),
+        )
+      }
+      for dest in destructions {
+        let (cx, cy) = dest
+        draw.line((cx - 8, cy - 8), (cx + 8, cy + 8), stroke: red + 2pt)
+        draw.line((cx - 8, cy + 8), (cx + 8, cy - 8), stroke: red + 2pt)
+      }
+
       draw.content(
         (x, y),
         p.display-name,