allow bullet symbol as list marker (for copy/paste from office documents)

[cgilite] / markdown.awk

diff --git a/markdown.awk b/markdown.awk
index b5aa538055fe017b8c2b2827f23631f5d91d23b3..6d22e3912e6f5e3580bffb61babf36b077117b39 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
@@ -691,21 +705,23 @@ function _block( block, LOCAL, st, len, text, title, attrib, href, guard, code,
     return "\n<dl>\n" _dlist( list ) "</dl>\n" _block( block );
 
   # Unordered list types
-  } else if ( text = _startlist( block, "ul", "-",   "([+*]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
+  } else if ( text = _startlist( block, "ul", "-",   "([+*•]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
+    return text;
+  } else if ( text = _startlist( block, "ul", "\\+", "([-*•]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
     return text;
-  } else if ( text = _startlist( block, "ul", "\\+", "([-*]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
+  } else if ( text = _startlist( block, "ul", "\\*", "([-+•]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
     return text;
-  } else if ( text = _startlist( block, "ul", "\\*", "([-+]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
+  } else if ( text = _startlist( block, "ul", "•", "([-+*]|[0-9]+\\.|#\\.|[0-9]+\\)|#\\))") ) {
     return text;
 
   # Ordered list types
-  } else if ( text = _startlist( block, "ol", "[0-9]+\\.", "([-+*]|#\\.|[0-9]+\\)|#\\))") ) {
+  } else if ( text = _startlist( block, "ol", "[0-9]+\\.", "([-+*•]|#\\.|[0-9]+\\)|#\\))") ) {
     return text;
-  } else if ( text = _startlist( block, "ol", "[0-9]+\\)", "([-+*]|[0-9]+\\.|#\\.|#\\))") ) {
+  } else if ( text = _startlist( block, "ol", "[0-9]+\\)", "([-+*•]|[0-9]+\\.|#\\.|#\\))") ) {
     return text;
-  } else if ( text = _startlist( block, "ol", "#\\.", "([-+*]|[0-9]+\\.|[0-9]+\\)|#\\))") ) {
+  } else if ( text = _startlist( block, "ol", "#\\.", "([-+*•]|[0-9]+\\.|[0-9]+\\)|#\\))") ) {
     return text;
-  } else if ( text = _startlist( block, "ol", "#\\)", "([-+*]|[0-9]+\\.|#\\.|[0-9]+\\))") ) {
+  } else if ( text = _startlist( block, "ol", "#\\)", "([-+*•]|[0-9]+\\.|#\\.|[0-9]+\\))") ) {
     return text;
 
   # Split paragraphs
@@ -727,15 +743,17 @@ 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(text, "(^|\n) ? ? ?" exclude "[ \t][^\n]+")) return 0;
     if (match( list, "\n" exclude "[ \t]" )) {
       block = substr(list, RSTART + 1) block;
       list = substr(list, 1, RSTART);