From 79643dc0faf86043d91bfbc047400b5dcbd818fc Mon Sep 17 00:00:00 2001
From: Joe Nahmias <joe@nahmias.net>
Date: Thu, 6 Jun 2024 12:31:56 -0400
Subject: [PATCH] fix: support non-word characters in link names for ePUB
 generation

Closes: chromatic#249
Inspired by @sd43 in 2684d569f452e99440d1520e35d50fa0382d49e1
---
 build/tools/build_epub.pl | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/build/tools/build_epub.pl b/build/tools/build_epub.pl
index e12bb7f7..e199868c 100755
--- a/build/tools/build_epub.pl
+++ b/build/tools/build_epub.pl
@@ -21,6 +21,7 @@
 my $anchors           = get_anchors(@chapters);
 my $table_of_contents = [];
 my %entries;
+my $link_pos;
 
 sub Pod::PseudoPod::HTML::begin_X
 {
@@ -84,19 +85,22 @@ sub clean_name
     return 'i' . $name;
 }
 
+sub Pod::PseudoPod::HTML::start_L
+{
+    my $self = shift;
+    $link_pos = length($self->{scratch});
+}
+
 sub Pod::PseudoPod::HTML::end_L
 {
     my $self = shift;
-    if ($self->{scratch} =~ s/\b(\w+)$//)
-    {
-        my $link = $1;
-        die "Unknown link $link\n" unless exists $anchors->{$link};
-        $self->{scratch} .=
-            '<a href="'
-          . $anchors->{$link}[0]
-          . '#' . $link . '">'
-          . $anchors->{$link}[1] . "</a>($link)";
-    }
+    my $link = substr($self->{scratch}, $link_pos);
+
+    die "Unknown link $link\n" unless exists $anchors->{$link};
+
+    substr($self->{scratch}, $link_pos, length($link),
+             '<a href="' . $anchors->{$link}[0] . "#$link\">"
+                         . $anchors->{$link}[1] . '</a>');
 }
 
 for my $chapter (@chapters)