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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
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To do so, attach the following notices to the program. It is safest
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state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 2024 Rémi Heredero
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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You should have received a copy of the GNU General Public License
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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<program> Copyright (C) 2024 Rémi Heredero
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# chronos
A Typst package to draw sequence diagrams with CeTZ

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#let is-leap-year(year) = {
if calc.rem(year, 4) != 0 {
return false
}
if calc.rem(year, 100) != 0 {
return true
}
return calc.rem(year, 400) == 0
}
#let get-month-days(month, year) = {
let leap = is-leap-year(year)
if month == 2 {
return if leap {29} else {28}
}
if month >= 8 {
month += 1
}
return if calc.rem(month, 2) == 0 {30} else {31}
}
#let add(dt, days) = {
assert(days >= 0, message: "days cannot be negative; use sub()")
let day = dt.day()
let month = dt.month()
let year = dt.year()
let month-days = get-month-days(month, year)
let leap = is-leap-year(year)
for _ in range(days) {
if day == month-days {
month += 1
day = 1
if month == 13 {
year += 1
month = 1
leap = is-leap-year(year)
}
month-days = get-month-days(month, year)
} else {
day += 1
}
}
return datetime(day: day, month: month, year: year)
}
#let sub(dt, days) = {
assert(days >= 0, message: "days cannot be negative; use add()")
let day = dt.day()
let month = dt.month()
let year = dt.year()
let month-days = get-month-days(month, year)
let leap = is-leap-year(year)
for _ in range(days) {
if day == 1 {
month -= 1
if month == 0 {
year -= 1
month = 12
leap = is-leap-year(year)
}
month-days = get-month-days(month, year)
day = month-days
} else {
day -= 1
}
}
return datetime(day: day, month: month, year: year)
}
#let offset(dt, days) = {
if days < 0 {
return sub(dt, -days)
}
return add(dt, days)
}
#let add-week-workingdays(dt, weeks) = {
let int_part = int(weeks)
let float_part = int( (weeks - int_part)*5 + 0.01 )
let new_date = add(dt, int_part*7)
let i = 0
while i < float_part {
new_date = add(new_date, 1)
if new_date.weekday() == 6 {
new_date = add(new_date, 2)
}
if new_date.weekday() == 7 {
new_date = add(new_date, 1)
}
i += 1
}
return new_date
}
#let diff-days(a, b) = {
let days = 0
let neg = b < a
if neg {
let c = a
a = b
b = c
}
while (a < b) {
days += 1
a = add(a, 1)
}
return if neg {-days} else {days}
}
#let diff-weeks(start_date, finish_date) = {
calc.round(
diff-days(
start_date,
add(finish_date, 1)
)/7,
digits: 2
)
}
#let diff-weeks-workingday(start_date, finish_date) = {
let days = 0
while (start_date <= finish_date) {
if start_date.weekday() != 6 and start_date.weekday() != 7 {
days += 1
}
start_date = add(start_date, 1)
}
return days/5
}
#let diff-months(start_date, finish_date) = {
calc.round(
diff-days(
start_date,
add(finish_date, 1)
)/30,
digits: 2
)
}
#let count-weeks(a, b) = {
let weeks = 0
let neg = b < a
if neg {
let c = a
a = b
b = c
}
while (a < b) {
weeks += 1
a = add(a, 7)
}
return if neg {-weeks} else {weeks}
}
#let count-months(a, b) = {
let months = 0
let neg = b < a
if neg {
let c = a
a = b
b = c
}
while (a < b) {
months += 1
a = add(a, 30)
}
return if neg {-months} else {months}
}
#let count-years(a, b) = {
let years = 0
let neg = b < a
if neg {
let c = a
a = b
b = c
}
while (a < b) {
years += 1
a = add(a, 365)
}
return if neg {-years} else {years}
}
#let remaining_week_on_month(date) ={
diff-weeks(
date,
datetime(
year: date.year(),
month: date.month(),
day: get-month-days(date.month(), date.year())
)
)
}
#let remaining_week_on_month-workingday(date) ={
diff-weeks-workingday(
date,
datetime(
year: date.year(),
month: date.month(),
day: get-month-days(date.month(), date.year())
)
)
}
#let remaining_week_on_year(date) ={
diff-weeks(
date,
datetime(
year: date.year(),
month: 12,
day: 31
)
)
}
#let workingday_ratio(date) = {
let weekday = date.weekday() -1
if weekday == 6 {
weekday = 5
}
if weekday == 7 {
weekday = 5
}
return weekday/5
}
#let equalDate(date1, date2) = {
let year = date1.year() == date2.year()
let month = date1.month() == date2.month()
let day = date1.day() == date2.day()
return year and month and day
}

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#import "timeliney.typ"
#import "datetime_calc.typ" as dtc
#let _header-months(start-time, end-time) = {
let months-name = ()
let months-duration = ()
let nbr-months = dtc.count-months(start-time, end-time)
let i = 0
let date = start-time
while (i < nbr-months) {
let rmg_week = dtc.remaining_week_on_month-workingday(date)
if date.month() == end-time.month() {
rmg_week = dtc.diff-weeks-workingday(date, dtc.offset(end-time, 2))
}
months-name.push(date.display("[month repr:long]"))
months-duration.push(rmg_week)
if date.month() == 12 {
date = datetime(
year: date.year()+1,
month: 1,
day: 1
)
} else {
date = datetime(
year: date.year(),
month: date.month()+1,
day: 1
)
}
i = i + 1
}
timeliney.headerline(
..range(nbr-months).map(
n => timeliney.group((
strong(months-name.at(n)),
months-duration.at(n)
))
),
)
}
#let _header-week-number(start-time, end-time) = {
timeliney.headerline(
timeliney.group(
..range(dtc.count-weeks(start-time, end-time)).map(
n => strong("W" + str(n + int(start-time.display("[week_number]"))))
)
),
)
}
#let _header-week-date(start-time, end-time) = {
timeliney.headerline(
timeliney.group(
..range(dtc.count-weeks(start-time, end-time)).map(
n => strong(
dtc.offset(start-time, n*7).display("[day]/[month]")
)
)
),
)
}
#let _today(project-start-date) = {
let weeks = 0
let foo = project-start-date
while (foo <= datetime.today()) {
weeks += 1
foo = dtc.add(foo, 7)
}
weeks = weeks - 1 + dtc.workingday_ratio(datetime.today())
timeliney.milestone(
at: weeks,
style: (stroke: red),
[]
)
}
#let create(
date-beginning: none,
date-finish: none,
header-months: true,
header-week-number: true,
header-week-date: false,
today-line: true,
doc
) = {
let gTask(description, ..args) = {
let complemented_task = ()
for arg in args.pos() {
if type(line) == dictionary {
complemented_task.push(arg)
} else {
let (date, eod) = arg
let weeks = 0
let foo = date-beginning
let task-week-duration = if type(eod) == datetime {
dtc.count-weeks(date, eod)
} else {
eod
}
while (foo <= date) {
weeks += 1
foo = dtc.add(foo, 7)
}
weeks = weeks - 1 + dtc.workingday_ratio(date)
let end = weeks + task-week-duration
complemented_task.push((weeks, end))
}
}
timeliney.task(
align(center, description),
..complemented_task,
style: (stroke: 2pt + gray)
)
}
let gMilestone(description, date) = {
let weeks = 0
let foo = date-beginning
while (foo <= date) {
weeks += 1
foo = dtc.add(foo, 7)
}
weeks = weeks - 1 + dtc.workingday_ratio(date)
timeliney.milestone(
at: weeks,
style: (stroke: (dash: "dashed")),
align(center, strong(description) + "\n" + date.display("[day]/[month]/[year]"))
)
}
let doc2 = ()
for elmt in doc {
if "type" in elmt and elmt.type == "gTask" {
doc2 += gTask(elmt.description, ..elmt.args)
} else if "type" in elmt and elmt.type == "gMilestone" {
doc2 += gMilestone(elmt.description, elmt.milestone-date)
} else {
doc2.push(elmt)
}
}
timeliney.timeline(
show-grid: true,
{
import timeliney: *
let duration-weeks = int(dtc.diff-weeks(date-beginning, dtc.offset(date-finish, 2)))
let year = date-beginning.display("[year]")
headerline(group(([*#year*], duration-weeks)))
if header-months {
_header-months(date-beginning, date-finish)
}
if header-week-number {
_header-week-number(date-beginning, date-finish)
}
if header-week-date {
_header-week-date(date-beginning, date-finish)
}
if today-line {
_today(date-beginning)
}
//timeliney.task(align(center, [foo]),(0,1),style: (stroke: 2pt + gray))
doc2
}
)
}
#let task(description, ..args) = ((
type: "gTask",
description: description,
args: args.pos(),
),)
#let milestone(description, milestone-date) = ((
type: "gMilestone",
milestone-date: milestone-date,
description: description,
),)

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#import "gantt.typ": *

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#import "@preview/cetz:0.1.2": canvas, draw
#let timeline(
body,
spacing: 5pt,
show-grid: false,
grid-style: (stroke: (dash: "dashed", thickness: .5pt, paint: gray)),
tasks-vline: true,
line-style: (stroke: 3pt),
milestone-overhang: 5pt,
milestone-layout: "in-place",
box-milestones: true,
milestone-line-style: (),
offset: 0,
) = style(
styles => {
layout(
size => {
canvas(
debug: false,
length: size.width,
{
import draw: *
let headers = ()
let tasks = ()
let flat_tasks = ()
let milestones = ()
let n_cols = 0
let pt = 1 / size.width.pt()
for line in body {
if line.type == "header" {
headers.push(line.headers)
if line.total > n_cols {
n_cols = line.total
}
} else if line.type == "task" or line.type == "taskgroup" {
tasks.push(line)
} else if line.type == "milestone" {
milestones.push(line)
}
}
// Task titles
group(
{
let i = 0
for task in tasks {
if task.type == "task" {
content(
(rel: (0, 0)),
task.name,
anchor: "top",
name: "task" + str(i),
padding: spacing,
)
anchor(
"task" + str(i) + "-bottom",
(rel: (0, 0), to: "task" + str(i) + ".bottom", update: true),
)
anchor(
"task" + str(i) + "-top",
(rel: (0, 0), to: "task" + str(i) + ".top-left", update: false),
)
anchor(
"task" + str(i),
(rel: (0, 0), to: "task" + str(i) + ".right", update: false),
)
flat_tasks.push(task)
i += 1
} else if task.type == "taskgroup" {
for t in task.tasks {
content(
(rel: (0, 0)),
t.name,
anchor: "top",
name: "task" + str(i),
padding: spacing,
)
anchor(
"task" + str(i) + "-bottom",
(rel: (0, 0), to: "task" + str(i) + ".bottom", update: true),
)
anchor(
"task" + str(i) + "-top",
(rel: (0, 0), to: "task" + str(i) + ".top-left", update: false),
)
anchor(
"task" + str(i),
(rel: (0, 0), to: "task" + str(i) + ".right", update: false),
)
flat_tasks.push(t)
i += 1
}
}
}
if milestone-layout == "aligned" {
for (i, milestone) in milestones.enumerate() {
content(
(rel: (0, 0)),
milestone.body,
anchor: "top",
name: "milestone" + str(i),
padding: spacing,
)
anchor(
"milestone" + str(i) + "-bottom",
(rel: (0, 0), to: "milestone" + str(i) + ".bottom", update: true),
)
anchor(
"milestone" + str(i) + "-right",
(rel: (0, 0), to: "milestone" + str(i) + ".right", update: false),
)
anchor(
"milestone" + str(i) + "-top",
(rel: (0, 0), to: "milestone" + str(i) + ".top", update: false),
)
}
}
},
name: "titles",
)
// Now that we have laid out the task titles, we can render the task group boxes
group(
ctx => {
on-layer(
1,
{
let (start_x, _, _) = coordinate.resolve(ctx, "titles.top-left")
let end_x = 1 + start_x
let i = 0
for group in tasks {
if group.type != "taskgroup" {
i += 1
continue
}
let start_i = i
let group_start = none
let group_end = none
for task in group.tasks {
if group_start == none {
let (_, start_y, _) = coordinate.resolve(ctx, "titles.task" + str(i) + "-top")
group_start = (start_x, start_y)
}
let (_, end_y, _) = coordinate.resolve(ctx, "titles.task" + str(i) + "-bottom")
group_end = (end_x, end_y)
i += 1
}
rect(group_start, group_end, stroke: 1pt)
}
if tasks-vline {
line("titles.top-right", "titles.bottom-right")
}
if box-milestones and milestone-layout == "aligned" {
let start = none
let end = none
for (i, milestone) in milestones.enumerate() {
if start == none {
let (_, start_y, _) = coordinate.resolve(ctx, "titles.milestone" + str(i) + "-top")
start = (start_x, start_y)
}
let (_, end_y, _) = coordinate.resolve(ctx, "titles.milestone" + str(i) + "-bottom")
end = (end_x, end_y)
}
rect(start, end, stroke: 1pt)
}
},
)
},
name: "boxes",
)
get-ctx(
ctx => {
let (start_x, start_y, _) = coordinate.resolve(ctx, "titles.top-right")
let end_x = 1 + coordinate.resolve(ctx, "titles.top-left").at(0)
let end_y = coordinate.resolve(ctx, "titles.bottom").at(1)
group(
{
for (i, header) in headers.rev().enumerate() {
let passed = 0
for group in header {
let group_start = none
let group_end = none
for (name, len) in group.titles {
let start = (
a: (start_x, start_y + 16 * (i + 1) * pt),
b: (end_x, start_y + 16 * (i + 1) * pt),
number: passed / n_cols,
)
if group_start == none { group_start = start }
let end = (
a: (start_x, start_y + 16 * i * pt),
b: (end_x, start_y + 16 * i * pt),
number: (passed + len) / n_cols,
)
group_end = end
content(start, end, anchor: "top-left", align(center + horizon, name))
passed += len
}
let group_style = (stroke: 1pt + black)
if "style" in group {
group_style = group.style
}
rect(group_start, group_end, ..group_style)
}
}
},
name: "top-headers",
)
// Draw the lines
for (i, task) in flat_tasks.enumerate() {
let start = "titles.task" + str(i)
let (_, task_start_y, _) = coordinate.resolve(ctx, "titles.task" + str(i))
let (task_top_x, task_top_y, _) = coordinate.resolve(ctx, "titles.task" + str(i) + "-top")
let (_, task_bottom_y, _) = coordinate.resolve(ctx, "titles.task" + str(i) + "-bottom")
for gantt_line in task.lines {
let start = (
a: (start_x, task_start_y),
b: (end_x, task_start_y),
number: (gantt_line.from + offset) / n_cols,
)
let end = (
a: (start_x, task_start_y),
b: (end_x, task_start_y),
number: (gantt_line.to + offset) / n_cols,
)
let style = line-style
if ("style" in gantt_line) { style = gantt_line.style }
line(start, end, ..style)
}
}
// Grid
if show-grid != false {
let month_width = (end_x - start_x) / n_cols
on-layer(
-1,
{
// Horizontal
if show-grid == true or show-grid == "x" {
for i in range(1, n_cols) {
line(
(start_x + month_width * i, start_y),
(start_x + month_width * i, end_y),
..grid-style,
)
}
}
if show-grid == true or show-grid == "y" {
for (i, task) in flat_tasks.enumerate() {
let (_, task_bottom_y, _) = coordinate.resolve(ctx, "titles.task" + str(i) + "-bottom")
line((start_x, task_bottom_y), (end_x, task_bottom_y), ..grid-style)
}
if milestone-layout == "aligned" {
for (i, milestone) in milestones.enumerate() {
let (_, bottom_y, _) = coordinate.resolve(ctx, "titles.milestone" + str(i) + "-bottom")
line((start_x, bottom_y), (end_x, bottom_y), ..grid-style)
}
}
}
// Border all around the timeline
rect("titles.top-left", (end_x, end_y), stroke: black + 1pt)
},
)
}
// Milestones
if milestones.len() > 0 {
let draw-milestone(
i,
at: 0,
body: "",
style: milestone-line-style,
overhang: milestone-overhang,
spacing: spacing,
anchor: "top",
type: "milestone",
) = {
if milestone-layout == "in-place" {
let x = (end_x - start_x) * ((at + offset) / n_cols) + start_x
get-ctx(
ctx => {
let pos = (x: x, y: end_y - (spacing + overhang).pt() * pt)
let box_x = x
let (w, h) = measure(body, ctx)
if x + w / 2 > end_x {
box_x = end_x - w / 2
}
if i != 0 {
let (prev_end_x, prev_start_y, _) = coordinate.resolve-anchor(ctx, "milestone" + str(i - 1) + ".top-right")
let prev_end_y = coordinate.resolve-anchor(ctx, "milestone" + str(i - 1) + ".bottom").at(1)
if box_x - w / 2 < prev_end_x and pos.y <= prev_start_y and pos.y + h >= prev_end_y {
pos = (x: x, y: prev_end_y - spacing.pt() * pt * 2)
}
}
line((x, start_y), (rel: (0, overhang.pt() * pt), to: pos), ..style)
on-layer(
1,
{
content((box_x, pos.y), anchor: anchor, body, name: "milestone" + str(i))
},
)
},
)
} else if milestone-layout == "aligned" {
let x = (end_x - start_x) * (at / n_cols) + start_x
let end_y = coordinate.resolve(ctx, "titles.milestone" + str(i) + "-right").at(1)
line((x, start_y), (x, end_y), (start_x, end_y), ..style)
}
}
on-layer(-0.5, {
if milestone-layout == "aligned" {
set-ctx(ctx => {
ctx.prev.pt = coordinate.resolve(ctx, "titles.bottom")
return ctx
})
}
for (i, milestone) in milestones.enumerate() {
draw-milestone(i, ..milestone)
}
})
}
},
)
},
)
},
)
},
)
#let headerline(..args) = {
let groups = args.pos()
let headers = ()
let current_group = ()
let total = 0
let parse_entry(e) = {
if type(e) == array {
return e
} else {
return (e, 1)
}
}
for grp in groups {
if type(grp) == array {
current_group.push(grp)
total += grp.at(1)
} else if type(grp) == dictionary {
if current_group.len() > 0 {
headers.push(current_group)
}
headers.push((titles: grp.group.map(parse_entry)))
total += grp.group.map(n => parse_entry(n).at(1)).sum()
} else {
current_group.push((grp, 1))
total += 1
}
}
if current_group.len() > 0 {
headers.push((titles: current_group))
}
return ((type: "header", headers: headers, total: total),)
}
#let group(..args) = {
return (group: args.pos())
}
#let task(name, style: none, ..lines) = {
let processed_lines = ()
for line in lines.pos() {
if type(line) == dictionary {
processed_lines.push(line)
} else {
let (from, to) = line
if style != none {
processed_lines.push((from: from, to: to, style: style))
} else {
processed_lines.push((from: from, to: to))
}
}
}
((type: "task", name: name, lines: processed_lines),)
}
#let taskgroup(title: none, tasks) = {
let extratask = ()
if title != none {
let min = none
let max = none
for task in tasks {
for l in task.lines {
if min == none or l.from < min {
min = l.from
}
if max == none or l.to > max {
max = l.to
}
}
}
extratask = ((type: "task", name: title, lines: ((from: min, to: max),)),)
}
((type: "taskgroup", tasks: extratask + tasks),)
}
#let milestone(body, at: none, ..options) = {
((type: "milestone", at: at, body: body, ..options.named()),)
}

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[package]
name = "elegtantt"
version = "0.0.1"
compiler = "0.11.0"
repository = "https://git.kb28.ch/Klagarge/elegantt"
entrypoint = "src/lib.typ"
authors = [
"Rémi Heredero <https://git.kb28.ch/Klagarge>"
]
categories = ["visualization"]
license = "GPL-3.0-only"
description = "A package to draw gantt fiagramm with date based on timeliney package"
keywords = ["gantt", "date", "planning", "timeliney"]
exclude = [ "/gallery/*" ]