linkify: implement Markdown link compatibility (again)

Although unescaped parentheses in URLs are technically allowed,
they are uncommon.  However, Markdown-like syntaxes are
unfortunately common for URLs, so we might as well support them.

This fixes parentheses detection at sentence endings, as seen
in practice on emails.

1 files changed, 22 insertions, 0 deletions

diff --git a/t/linkify.t b/t/linkify.t
index 49cbbd64..99acf17d 100644
--- a/t/linkify.t
+++ b/t/linkify.t
@@ -57,4 +57,26 @@ use PublicInbox::Linkify;
         is($s, qq(hello <a\nhref="$u">$u</a> world), "root + fragment");
 }
 
+# Markdown compatibility
+{
+        my $l = PublicInbox::Linkify->new;
+        my $u = 'http://example.com/';
+        my $s = "[markdown]($u)";
+        $s = $l->linkify_1($s);
+        $s = $l->linkify_2($s);
+        is($s, qq![markdown](<a\nhref="$u">$u</a>)!, 'Markdown-compatible');
+
+        $s = qq![markdown]($u "title")!;
+        $s = $l->linkify_1($s);
+        $s = $l->linkify_2($s);
+        is($s, qq![markdown](<a\nhref="$u">$u</a> "title")!,
+                'Markdown title compatible');
+
+        $s = qq![markdown]($u).!;
+        $s = $l->linkify_1($s);
+        $s = $l->linkify_2($s);
+        is($s, qq![markdown](<a\nhref="$u">$u</a>).!,
+                'Markdown-compatible end of sentence');
+}
+
 done_testing();