docgen: support markdown headings too

lib/packages/docutils/rst.nim

@@ -1065,15 +1065,32 @@ proc isOptionList(p: RstParser): bool =
   result = match(p, p.idx, "-w") or match(p, p.idx, "--w") or
            match(p, p.idx, "/w") or match(p, p.idx, "//w")
 
+proc isMarkdownHeadlinePattern(s: string): bool =
+  if s.len >= 1 and s.len <= 6:
+    for c in s:
+      if c != '#': return false
+    result = true
+
+proc isMarkdownHeadline(p: RstParser): bool =
+  if roSupportMarkdown in p.s.options:
+    if isMarkdownHeadlinePattern(p.tok[p.idx].symbol) and p.tok[p.idx+1].kind == tkWhite:
+      if p.tok[p.idx+2].kind in {tkWord, tkOther, tkPunct}:
+        result = true
+
 proc whichSection(p: RstParser): RstNodeKind =
   case p.tok[p.idx].kind
   of tkAdornment:
     if match(p, p.idx + 1, "ii"): result = rnTransition
     elif match(p, p.idx + 1, " a"): result = rnTable
     elif match(p, p.idx + 1, "i"): result = rnOverline
-    else: result = rnLeaf
+    elif isMarkdownHeadline(p):
+      result = rnHeadline
+    else:
+      result = rnLeaf
   of tkPunct:
-    if match(p, tokenAfterNewline(p), "ai"):
+    if isMarkdownHeadline(p):
+      result = rnHeadline
+    elif match(p, tokenAfterNewline(p), "ai"):
       result = rnHeadline
     elif p.tok[p.idx].symbol == "::":
       result = rnLiteralBlock
@@ -1158,6 +1175,12 @@ proc parseParagraph(p: var RstParser, result: PRstNode) =
 
 proc parseHeadline(p: var RstParser): PRstNode =
   result = newRstNode(rnHeadline)
+  if isMarkdownHeadline(p):
+    result.level = p.tok[p.idx].symbol.len
+    assert(p.tok[p.idx+1].kind == tkWhite)
+    inc p.idx, 2
+    parseUntilNewline(p, result)
+  else:
     parseUntilNewline(p, result)
     assert(p.tok[p.idx].kind == tkIndent)
     assert(p.tok[p.idx + 1].kind == tkAdornment)

nimdoc/testproject/expected/subdir/subdir_b/utils.html

@@ -1238,7 +1238,12 @@ function main() {
     </select>
   </div>
   <ul class="simple simple-toc" id="toc-list">
-<li>
+<li><a class="reference" id="this-is-now-a-header_toc" href="#this-is-now-a-header">This is now a header</a></li>
+<ul class="simple"><li><a class="reference" id="this-is-now-a-header-next-header_toc" href="#this-is-now-a-header-next-header">Next header</a></li>
+<ul class="simple"><li><a class="reference" id="next-header-and-so-on_toc" href="#next-header-and-so-on">And so on</a></li>
+</ul></ul><li><a class="reference" id="more-headers_toc" href="#more-headers">More headers</a></li>
+<ul class="simple"><li><a class="reference" id="more-headers-up-to-level-6_toc" href="#more-headers-up-to-level-6">Up to level 6</a></li>
+</ul><li>
   <a class="reference reference-toplevel" href="#7" id="57">Types</a>
   <ul class="simple simple-toc-section">
       <li><a class="reference" href="#SomeType"
@@ -1271,7 +1276,12 @@ function main() {
   </div>
   <div class="nine columns" id="content">
   <div id="tocRoot"></div>
-  <p class="module-desc"></p>
+  <p class="module-desc">
+<h1><a class="toc-backref" id="this-is-now-a-header" href="#this-is-now-a-header">This is now a header</a></h1>
+<h2><a class="toc-backref" id="this-is-now-a-header-next-header" href="#this-is-now-a-header-next-header">Next header</a></h2>
+<h3><a class="toc-backref" id="next-header-and-so-on" href="#next-header-and-so-on">And so on</a></h3>
+<h1><a class="toc-backref" id="more-headers" href="#more-headers">More headers</a></h1>
+<h6><a class="toc-backref" id="more-headers-up-to-level-6" href="#more-headers-up-to-level-6">Up to level 6</a></h6></p>
   <div class="section" id="7">
 <h1><a class="toc-backref" href="#7">Types</a></h1>
 <dl class="item">

nimdoc/testproject/expected/theindex.html

@@ -1220,7 +1220,7 @@ function main() {
 <div class="document" id="documentId">
   <div class="container">
     <h1 class="title">Index</h1>
-    Modules: <a href="subdir/subdir_b/utils.html">subdir/subdir_b/utils</a>, <a href="testproject.html">testproject</a>.<br/><p /><h2>API symbols</h2>
+    Modules: <a href="testproject.html">testproject</a>, <a href="utils.html">utils</a>.<br/><p /><h2>API symbols</h2>
 <dl><dt><a name="A" href="#A"><span>A:</span></a></dt><dd><ul class="simple">
 <li><a class="reference external"
           data-doc-search-tag="testproject: A" href="testproject.html#A">testproject: A</a></li>

nimdoc/testproject/subdir/subdir_b/utils.nim

@@ -1,3 +1,16 @@
+##[
+
+# This is now a header
+
+## Next header
+
+### And so on
+
+# More headers
+
+###### Up to level 6
+
+]##
 
 type
   SomeType* = enum