From 882284387895d0504592ff4f5be7d9927181b1ca Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Wed, 30 Aug 2023 17:20:25 +0200
Subject: [PATCH] unified list code

---
 markdown.awk | 65 +++++++++++++++++++++++-----------------------------
 1 file changed, 29 insertions(+), 36 deletions(-)

diff --git a/markdown.awk b/markdown.awk
index 57a04e9..4b180eb 100755
--- a/markdown.awk
+++ b/markdown.awk
@@ -691,38 +691,12 @@ function _block( block, LOCAL, st, len, text, title, attrib, href, guard, code,
     return "\n<dl>\n" _dlist( list ) "</dl>\n" _block( block );
 
   # Unordered list
-  } else if ( match( block, "(^|\n) ? ? ?[-+*][ \t][^\n]+(\n|$)" \
-                 "(([ \t]*\n)* ? ? ?[-+*][ \t][^\n]+(\n|$)" \
-                 "|([ \t]*\n)*( ? ? ?\t|  +)[^\n]+(\n|$)" \
-                 "|[^\n \t][^\n]+(\n|$))*" ) ) {
-    st = RSTART; len = RLENGTH; list = substr( block, RSTART, RLENGTH);
-    sub("^\n", "", list); match(list, "^ ? ? ?[-+*]"); indent = RLENGTH;
-    gsub( "(^|\n) {0," indent - 1 "}", "\n", list); sub("^\n", "", list);
-
-    text = substr(block, 1, st - 1); block = substr(block, st + len);
-    if (match( list, "\n([0-9]+\\.|#\\.)[ \t]" )) {
-      block = substr(list, RSTART + 1) block;
-      list = substr(list, 1, RSTART);
-    }
-
-    return _block( text ) "<ul>\n" _list( list, "[-+*]" ) "</ul>\n" _block( block );
+  } else if ( text = _startlist( block, "ul", "[-+*]", "([0-9]+\\.|#\\.)") ) {
+    return text;
 
   # Ordered list
-  } else if ( match( block, "(^|\n) ? ? ?([0-9]+\\.|#\\.)[ \t][^\n]+(\n|$)" \
-                 "(([ \t]*\n)* ? ? ?([0-9]+\\.|#\\.)[ \t][^\n]+(\n|$)" \
-                 "|([ \t]*\n)*( ? ? ?\t|  +)[^\n]+(\n|$)" \
-                 "|[^\n \t][^\n]+(\n|$))*" ) ) {
-    st = RSTART; len = RLENGTH; list = substr( block, RSTART, RLENGTH);
-    sub("^\n", "", list); match(list, "^ ? ? ?[0-9#]"); indent = RLENGTH;
-    gsub( "(^|\n) {0," indent - 1 "}", "\n", list); sub("^\n", "", list);
-
-    text = substr(block, 1, st - 1); block = substr(block, st + len);
-    if (match( list, "\n[-+*][ \t]" )) {
-      block = substr(list, RSTART + 1) block;
-      list = substr(list, 1, RSTART);
-    }
-
-    return _block( text ) "<ol>\n" _list( list, "([0-9]+\\.|#\\.)" ) "</ol>\n" _block( block );
+  } else if ( text = _startlist( block, "ol", "([0-9]+\\.|#\\.)", "[-+*]") ) {
+    return text;
 
   # Split paragraphs
   } else if ( match( block, /(^|\n)[[:space:]]*(\n|$)/) ) {
@@ -741,17 +715,36 @@ function _block( block, LOCAL, st, len, text, title, attrib, href, guard, code,
   }
 }
 
+function _startlist(block, type, mark, exclude, LOCAL, st, len, list, indent, text) {
+  if (match( block, "(^|\n) ? ? ?" mark "[ \t][^\n]+(\n|$)" \
+         "(([ \t]*\n)* ? ? ?" mark "[ \t][^\n]+(\n|$)" \
+         "|([ \t]*\n)*( ? ? ?\t|  +)[^\n]+(\n|$)" \
+         "|[^\n \t][^\n]+(\n|$))*" ) ) {
+    st = RSTART; len = RLENGTH; list = substr( block, RSTART, RLENGTH);
+
+    sub("^\n", "", list); match(list, "^ ? ? ?"); indent = RLENGTH;
+    gsub( "(^|\n) {0," indent - 1 "}", "\n", list); sub("^\n", "", list);
+
+    text = substr(block, 1, st - 1); block = substr(block, st + len);
+    if (match( list, "\n" exclude "[ \t]" )) {
+      block = substr(list, RSTART + 1) block;
+      list = substr(list, 1, RSTART);
+    }
+
+    return _block( text ) "<" type ">\n" _list( list, mark ) "</" type ">\n" _block( block );
+  } else return 0;
+}
+
 function _list (block, mark, p, LOCAL, len, st, text, indent, task) {
   if ( match(block, "^([ \t]*\n)*$")) return;
+
   match(block, "^" mark "[ \t]"); indent = RLENGTH;
   sub("^" mark "[ \t]", "", block);
+
   if (match(block, /\n[ \t]*\n/)) p = 1;
 
-  match( block, "\n" mark "[ \t][^\n]+(\n|$)" \
-      "(([ \t]*\n)* ? ? ?" mark "[ \t][^\n]+(\n|$)" \
-      "|([ \t]*\n)*( ? ? ?\t|  +)[^\n]+(\n|$)" \
-      "|[^\n \t][^\n]+(\n|$))*");
-  (RLENGTH == -1) ? st = length(block) + 1 : st = RSTART;
+  match( block, "\n" mark "[ \t][^\n]+(\n|$)" );
+  st = (RLENGTH == -1) ? length(block) + 1 : RSTART;
   text = substr(block, 1, st); block = substr(block, st + 1);
 
   gsub("\n {0," indent "}", "\n", text);
@@ -761,7 +754,7 @@ function _list (block, mark, p, LOCAL, len, st, text, indent, task) {
          match( text, /^\[\/\]/  ) ? "<li class=\"task partial\"><input type=checkbox disabled>"      : \
          match( text, /^\[\?\]/  ) ? "<li class=\"task unsure\"><input type=checkbox disabled>"       : \
          match( text, /^\[[xX]\]/) ? "<li class=\"task done\"><input type=checkbox disabled checked>" : "<li>";
-  sub(/^\[[-? /xX]\]/, "", text);
+  sub(/^\[[-? \/xX]\]/, "", text);
 
   text = _nblock( text );
   if ( ! p && match( text, "^<p>(</p[^>]|</[^p]|<[^/]|[^<])*</p>\n$" ))
-- 
2.39.2