bugfix: do not consume multiple paragraphs in list start

[cgilite] / markdown.awk

diff --git a/markdown.awk b/markdown.awk
index b5aa538055fe017b8c2b2827f23631f5d91d23b3..92b32fc2d2d462bc30f4069934f48f1e87c6ad70 100755 (executable)
--- a/markdown.awk
+++ b/markdown.awk
@@ -5,6 +5,20 @@
 # Meant to support all features of John Grubers basic Markdown
 # + a number of common extensions, mostly inspired by Pandoc Markdown
 
+# Copyright 2021 - 2023 Paul Hänsch
+# 
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+# 
+# THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+# IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
 # Supported Features / TODO:
 # ==========================
 # [x] done    [ ] todo    [-] not planned    ? unsure
@@ -727,15 +741,16 @@ 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);
+                                   "(([ \t]*\n)* ? ? ?" mark "[ \t][^\n]+(\n|$)" \
+                                   "|([ \t]*\n)*( ? ? ?\t|  +)[^\n]+(\n|$)" \
+                                   "|[^\n \t][^\n]+(\n|$))*" ) ) {
+    st = RSTART; len = RLENGTH; list = substr( block, st, len);
 
     sub("^\n", "", list); match(list, "^ ? ? ?"); indent = RLENGTH;
     gsub( "(^|\n) {0," indent "}", "\n", list); sub("^\n", "", list);
 
     text = substr(block, 1, st - 1); block = substr(block, st + len);
+    if (match(text, /\n[[:space:]]*\n/)) return 0;
     if (match( list, "\n" exclude "[ \t]" )) {
       block = substr(list, RSTART + 1) block;
       list = substr(list, 1, RSTART);