Add CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE. Closes #71.

github · Jan 25, 2018 · c159d7b · c159d7b
1 parent 2ed8b89
commit c159d7b
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Showing 4 changed files with 25 additions and 2 deletions.
diff --git a/extensions/strikethrough.c b/extensions/strikethrough.c
@@ -27,7 +27,8 @@ static cmark_node *match(cmark_syntax_extension *self, cmark_parser *parser,
   res->start_line = res->end_line = cmark_inline_parser_get_line(inline_parser);
   res->start_column = cmark_inline_parser_get_column(inline_parser) - delims;
 
-  if (left_flanking || right_flanking) {
+  if ((left_flanking || right_flanking) &&
+      (!(parser->options & CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE) || delims == 2)) {
     cmark_inline_parser_push_delimiter(inline_parser, character, left_flanking,
                                        right_flanking, res);
   }

diff --git a/man/man3/cmark-gfm.3 b/man/man3/cmark-gfm.3
@@ -1,4 +1,4 @@
-.TH cmark-gfm 3 "November 09, 2017" "LOCAL" "Library Functions Manual"
+.TH cmark-gfm 3 "January 25, 2018" "LOCAL" "Library Functions Manual"
 .SH
 NAME
 .PP
@@ -957,6 +957,19 @@ Be liberal in interpreting inline HTML tags.
 .PP
 Parse footnotes.
 
+.PP
+.nf
+\fC
+.RS 0n
+#define CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE (1 << 14)
+.RE
+\f[]
+.fi
+
+.PP
+Only parse strikethroughs if surrounded by exactly 2 tildes. Gives some
+compatibility with redcarpet.
+
 .SS
 Version information
 

diff --git a/src/cmark.h b/src/cmark.h
@@ -724,6 +724,11 @@ char *cmark_render_latex_with_mem(cmark_node *root, int options, int width, cmar
  */
 #define CMARK_OPT_FOOTNOTES (1 << 13)
 
+/** Only parse strikethroughs if surrounded by exactly 2 tildes.
+ * Gives some compatibility with redcarpet.
+ */
+#define CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE (1 << 14)
+
 /**
  * ## Version information
  */

diff --git a/src/main.c b/src/main.c
@@ -44,6 +44,8 @@ void print_usage() {
   printf("  --footnotes      Parse footnotes\n");
   printf("  --extension, -e EXTENSION_NAME Specify an extension name to use\n");
   printf("  --list-extensions              List available extensions and quit\n");
+  printf("  --strikethrough-double-tilde   Only parse strikethrough (if enabled)\n");
+  printf("                                 with two tildes\n");
   printf("  --help, -h       Print usage information\n");
   printf("  --version        Print version\n");
 }
@@ -129,6 +131,8 @@ int main(int argc, char *argv[]) {
     } else if (strcmp(argv[i], "--list-extensions") == 0) {
       print_extensions();
       goto success;
+    } else if (strcmp(argv[i], "--strikethrough-double-tilde") == 0) {
+      options |= CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE;
     } else if (strcmp(argv[i], "--sourcepos") == 0) {
       options |= CMARK_OPT_SOURCEPOS;
     } else if (strcmp(argv[i], "--hardbreaks") == 0) {