split up sources into manageable files

src/elements/multiplexer.typ

@@ -0,0 +1,64 @@
+#import "@preview/cetz:0.2.2": draw
+#import "../util.typ"
+#import "element.typ"
+
+#let draw-shape(id, tl, tr, br, bl, fill, stroke) = {
+  let tr2 = (tr, 20%, br)
+  let br2 = (tr, 80%, br)
+  let f = draw.group(name: id, {
+    draw.merge-path(
+      inset: 0.5em,
+      fill: fill,
+      stroke: stroke,
+      close: true,
+      draw.line(tl, tr2, br2, bl)
+    )
+    draw.anchor("north", (tl, 50%, tr2))
+    draw.anchor("south", (bl, 50%, br2))
+    draw.anchor("west", (tl, 50%, bl))
+    draw.anchor("east", (tr2, 50%, br2))
+  })
+  return (f, tl, tr, br, bl)
+}
+
+#let multiplexer(
+  x: none,
+  y: none,
+  w: none,
+  h: none,
+  name: none,
+  name-anchor: "center",
+  entries: 2,
+  fill: none,
+  stroke: black + 1pt,
+  id: "",
+  debug: (
+    grid: false,
+    ports: false
+  )
+) = {
+  let ports = ()
+
+  if (type(entries) == int) {
+    let nbits = calc.ceil(calc.log(entries, base: 2))
+    for i in range(entries) {
+      let bits = util.lpad(str(i, base: 2), nbits)
+      ports.push((id: "in" + str(i), name: bits))
+    }
+  }
+  
+  element.elmt(
+    draw-shape: draw-shape,
+    x: x,
+    y: y,
+    w: w,
+    h: h,
+    name: name,
+    name-anchor: name-anchor,
+    ports: (west: ports, east: ((id: "out"),)),
+    fill: fill,
+    stroke: stroke,
+    id: id,
+    debug: debug
+  )
+}