refactor Typst files

translate-files/从物品整理到心灵整理/helpers.typ

@@ -0,0 +1,45 @@
+// Helper functions for the bilingual outline and table of contents.
+
+#let to-string(content) = {
+  if type(content) == str {
+    content
+  } else if content.func() == text {
+    content.text
+  } else if content.has("children") {
+    content.children.map(to-string).join("")
+  } else {
+    ""
+  }
+}
+
+#let is-chinese-heading(content) = {
+  let txt = to-string(content)
+  let cn-re = regex("[\u{4e00}-\u{9fff}]")
+  let en-re = regex("[A-Za-z]")
+  for c in txt.clusters() {
+    if c.match(cn-re) != none { return true }
+    if c.match(en-re) != none { return false }
+  }
+  false
+}
+
+#let toc() = context {
+  let indent-per-level = 1.5em
+  let headings = query(heading.where(outlined: true))
+  for h in headings {
+    let is-cn = is-chinese-heading(h.body)
+    block(
+      inset: (left: (h.level - 1) * indent-per-level),
+      above: if is-cn { 0.3em } else { 0.7em },
+      below: if is-cn { 0.7em } else { 1.2em },
+      {
+        if is-cn {
+          h.body
+        } else {
+          let page-num = counter(page).at(h.location()).first()
+          h.body + box(width: 1fr, repeat[.]) + str(page-num)
+        }
+      }
+    )
+  }
+}