restructured code in separated files

src/sequence.typ

@@ -0,0 +1,152 @@
+#import "consts.typ": *
+#import "@preview/cetz:0.2.2": draw
+
+#let _seq(
+  p1,
+  p2,
+  comment: none,
+  dashed: false,
+  tip: "default",
+  color: black,
+  flip: false,
+  enable-dst: false,
+  disable-dst: false,
+  destroy-dst: false,
+  disable-src: false,
+  destroy-src: false,
+) = {
+  return ((
+    type: "seq",
+    p1: p1,
+    p2: p2,
+    comment: comment,
+    dashed: dashed,
+    tip: tip,
+    color: color,
+    flip: flip,
+    enable-dst: enable-dst,
+    disable-dst: disable-dst,
+    destroy-dst: destroy-dst,
+    disable-src: disable-src,
+    destroy-src: destroy-src,
+  ),)
+}
+
+#let render(pars-i, x-pos, elmt, y, lifelines) = {
+  let shapes = ()
+
+  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: (
+      dash: if elmt.dashed {"dashed"} else {"solid"},
+      paint: elmt.color
+    )
+  )
+
+  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 {
+      shapes += draw.content(
+        (x1, y),
+        elmt.comment,
+        anchor: if elmt.flip {"south-east"} else {"south-west"},
+        padding: 3pt
+      )
+    }
+
+    shapes += draw.line(
+      (x1, y),
+      (x2, y),
+      (x2, y - 10),
+      (x3, y - 10),
+      ..style
+    )
+    y -= 10
+
+  } else {
+    if elmt.comment != none {
+      let x = calc.min(x1, x2)
+      if x2 < x1 {
+        x += COMMENT-PAD
+      }
+      shapes += draw.content(
+        (x, y),
+        elmt.comment,
+        anchor: "south-west",
+        padding: 3pt
+      )
+    }
+
+    shapes += draw.line(
+      (x1, y),
+      (x2, y),
+      ..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
+
+  let r = (y, lifelines, shapes)
+  return r
+}