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-rw-r--r--lib/PublicInbox/HlMod.pm21
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/PublicInbox/HlMod.pm b/lib/PublicInbox/HlMod.pm
index 014d82fd..36e31106 100644
--- a/lib/PublicInbox/HlMod.pm
+++ b/lib/PublicInbox/HlMod.pm
@@ -16,7 +16,7 @@ package PublicInbox::HlMod;
 use strict;
 use warnings;
 use highlight; # SWIG-generated stuff
-use PublicInbox::Hval qw(src_escape);
+use PublicInbox::Hval qw(src_escape ascii_html);
 my $hl;
 
 sub _parse_filetypes ($) {
@@ -127,4 +127,23 @@ sub do_hl_lang {
         \$out;
 }
 
+# Highlight text, but support Markdown "```$LANG" notation
+# while preserving WYSIWYG of plain-text documentation.
+# This is NOT to be enabled by default or encouraged for parsing
+# emails, since it is NOT stable and can lead to standards
+# proliferation of email.
+sub do_hl_text {
+        my ($self, $str) = @_;
+
+        $$str = join('', map {
+                if (/\A(``` ?)(\w+)\s*?\n(.+)(^```\s*)\z/sm) {
+                        my ($pfx, $lang, $code, $post) = ($1, $2, $3, $4);
+                        my $hl = do_hl_lang($self, \$code, $lang) || \$code;
+                        $pfx . $lang . "\n" . $$hl . $post;
+                } else {
+                        ascii_html($_);
+                }
+        } split(/(^``` ?\w+\s*?\n.+?^```\s*$)/sm, $$str));
+}
+
 1;