mark: Move mark shapes to extra file

src/mark-shapes.typ

@@ -0,0 +1,74 @@
+#import "drawable.typ"
+#import "path-util.typ"
+
+// Calculate triangular tip offset, depending on the strokes
+// join type.
+//
+// The angle is calculated for an isosceles triangle of base style.widh
+// and height style.length
+#let calculate-tip-offset(style) = {
+  if style.stroke.join == "round" {
+    return style.stroke.thickness / 2
+  }
+
+  if style.length == 0 {
+    return 0
+  }
+
+  let angle = calc.atan(style.width / (2 * style.length) / if style.harpoon { 2 } else { 1 } ) * 2
+  // If the miter length divided by the stroke width exceeds
+  // the stroke miter limit then the miter join is converted to a bevel.
+  // See: https://svgwg.org/svg2-draft/painting.html#LineJoin
+  if style.stroke.join == "miter" {
+    let angle = calc.abs(angle)
+    let miter-limit = 1 / calc.sin(angle / 2)
+    if miter-limit <= style.stroke.miter-limit {
+      return miter-limit * (style.stroke.thickness / 2)
+    }
+  }
+
+  // style.stroke.join must be "bevel"
+  return calc.sin(angle/2) * (style.stroke.thickness / 2)
+}
+
+
+// Dictionary of built-in mark styles
+//
+// (style) => (drawables:, tip-offset:, distance:)
+#let marks = (
+  triangle: (style) => (
+    drawables: drawable.path(
+      path-util.line-segment(
+        (
+          (0, 0),
+          (style.length, style.width/2),
+          if style.harpoon { (style.length, 0) } else { (style.length, -style.width/2) }
+        )
+      ),
+      close: true,
+      fill: style.fill,
+      stroke: style.stroke
+    ),
+    tip-offset: calculate-tip-offset(style),
+    distance: style.length
+  ),
+  stealth: (style) => (
+    drawables: drawable.path(
+      path-util.line-segment(
+        (
+          (0, 0),
+          (style.length, style.width/2),
+          (style.length - style.inset, 0),
+          if not style.harpoon {
+            (style.length, -style.width/2)
+          }
+        ).filter(c => c != none)
+      ),
+      stroke: style.stroke,
+      close: true,
+      fill: style.fill
+    ),
+    distance: style.length - style.inset,
+    tip-offset: calculate-tip-offset(style)
+  )
+)

src/mark.typ

@@ -1,86 +1,14 @@
 #let typst-length = length
-#import "bezier.typ"
 #import "drawable.typ"
 #import "vector.typ"
 #import "matrix.typ"
 #import "util.typ"
 #import "path-util.typ"
 #import "styles.typ"
+#import "mark-shapes.typ"
 
 #let check-mark(style) = (style.start, style.end, style.symbol).any(v => v != none)
 
-// Calculate triangular tip offset, depending on the strokes
-// join type.
-//
-// The angle is calculated for an isosceles triangle of base style.widh
-// and height style.length
-#let calculate-tip-offset(style) = {
-  if style.stroke.join == "round" {
-    return style.stroke.thickness / 2
-  }
-
-  if style.length == 0 {
-    return 0
-  }
-
-  let angle = calc.atan(style.width / (2 * style.length) / if style.harpoon { 2 } else { 1 } ) * 2
-  // If the miter length divided by the stroke width exceeds
-  // the stroke miter limit then the miter join is converted to a bevel.
-  // See: https://svgwg.org/svg2-draft/painting.html#LineJoin
-  if style.stroke.join == "miter" {
-    let angle = calc.abs(angle)
-    let miter-limit = 1 / calc.sin(angle / 2)
-    if miter-limit <= style.stroke.miter-limit {
-      return miter-limit * (style.stroke.thickness / 2)
-    }
-  }
-
-  // style.stroke.join must be "bevel"
-  return calc.sin(angle/2) * (style.stroke.thickness / 2)
-}
-
-// Dictionary of built-in mark styles
-//
-// (style) => (drawables:, tip-offset:, distance:)
-#let marks = (
-  triangle: (style) => (
-    drawables: drawable.path(
-      path-util.line-segment(
-        (
-          (0, 0),
-          (style.length, style.width/2),
-          if style.harpoon { (style.length, 0) } else { (style.length, -style.width/2) }
-        )
-      ),
-      close: true,
-      fill: style.fill,
-      stroke: style.stroke
-    ),
-    tip-offset: calculate-tip-offset(style),
-    distance: style.length
-  ),
-  stealth: (style) => (
-    drawables: drawable.path(
-      path-util.line-segment(
-        (
-          (0, 0),
-          (style.length, style.width/2),
-          (style.length - style.inset, 0),
-          if not style.harpoon {
-            (style.length, -style.width/2)
-          }
-        ).filter(c => c != none)
-      ),
-      stroke: style.stroke,
-      close: true,
-      fill: style.fill
-    ),
-    distance: style.length - style.inset,
-    tip-offset: calculate-tip-offset(style)
-  )
-)
-
-
 #let process-style(ctx, style, root) = {
   let base-style = (
     symbol: auto,
@@ -180,7 +108,7 @@
 ///   - drawables (drawables): The transformed drawables of the mark.
 ///   - distance: The distance between the tip of the mark and the end.
 #let place-mark(style, pos, angle) = {
-  let (drawables, distance, tip-offset) = (marks.at(style.symbol))(style)
+  let (drawables, distance, tip-offset) = (mark-shapes.marks.at(style.symbol))(style)
 
   return (
     drawables: drawable.apply-transform(
@@ -205,7 +133,7 @@
     if style.symbol == none {
       continue
     }
-    let mark = (marks.at(style.symbol))(style)
+    let mark = (mark-shapes.marks.at(style.symbol))(style)
     mark.length = mark.distance + mark.tip-offset
 
     let pos = path-util.point-on-path(