From f28ac7c7cbc92972547c30f60f563bd93ec0d91e Mon Sep 17 00:00:00 2001
From: awer123456 <127011722+awer123456@users.noreply.github.com>
Date: Wed, 2 Sep 2026 15:52:48 +0800
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---
spec/invidious/frontend/watch_page_spec.cr | 56 ++++++++++++++++++++++
src/invidious/frontend/watch_page.cr | 41 ++++++++++++++++
src/invidious/views/watch.ecr | 2 +-
3 files changed, 98 insertions(+), 1 deletion(-)
create mode 100644 spec/invidious/frontend/watch_page_spec.cr
diff --git a/spec/invidious/frontend/watch_page_spec.cr b/spec/invidious/frontend/watch_page_spec.cr
new file mode 100644
index 000000000..a44d36c15
--- /dev/null
+++ b/spec/invidious/frontend/watch_page_spec.cr
@@ -0,0 +1,56 @@
+require "../../spec_helper"
+require "../../../src/invidious/frontend/watch_page"
+
+Spectator.describe Invidious::Frontend::WatchPage do
+ describe ".linkify_title_hashtags" do
+ it "links hashtags while preserving surrounding punctuation" do
+ result = Invidious::Frontend::WatchPage.linkify_title_hashtags(
+ "Watch (#music), then #news!"
+ )
+
+ expect(result).to eq(
+ %(Watch (#music), then #news!)
+ )
+ end
+
+ it "does not link hashes inside words or without a name" do
+ result = Invidious::Frontend::WatchPage.linkify_title_hashtags(
+ "C# test#music #"
+ )
+
+ expect(result).to eq("C# test#music #")
+ end
+
+ it "links and encodes Unicode hashtags" do
+ hashtag = "\u{97F3}\u{4E50}"
+
+ result = Invidious::Frontend::WatchPage.linkify_title_hashtags(
+ "Listen ##{hashtag}"
+ )
+
+ expect(result).to eq(
+ %(Listen ##{hashtag})
+ )
+ end
+
+ it "escapes title markup and link text" do
+ result = Invidious::Frontend::WatchPage.linkify_title_hashtags(
+ %( & #news)
+ )
+
+ expect(result).to eq(
+ %(<script>#music</script> & #news)
+ )
+ end
+
+ it "does not turn character-reference-like text into hashtag links" do
+ result = Invidious::Frontend::WatchPage.linkify_title_hashtags(
+ "Literal A and A plus #music"
+ )
+
+ expect(result).to eq(
+ %(Literal A and A plus #music)
+ )
+ end
+ end
+end
diff --git a/src/invidious/frontend/watch_page.cr b/src/invidious/frontend/watch_page.cr
index 2f640e8cf..2eda3e732 100644
--- a/src/invidious/frontend/watch_page.cr
+++ b/src/invidious/frontend/watch_page.cr
@@ -1,6 +1,47 @@
module Invidious::Frontend::WatchPage
extend self
+ def linkify_title_hashtags(title : String) : String
+ characters = title.chars
+
+ String.build(title.bytesize) do |html|
+ index = 0
+
+ while index < characters.size
+ character = characters[index]
+ starts_hashtag = character == '#' &&
+ (index == 0 || !hashtag_prefix_character?(characters[index - 1]))
+
+ if starts_hashtag
+ hashtag_end = index + 1
+ while hashtag_end < characters.size && hashtag_character?(characters[hashtag_end])
+ hashtag_end += 1
+ end
+
+ if hashtag_end > index + 1
+ hashtag = characters[index + 1...hashtag_end].join
+
+ html << %(#)
+ html << HTML.escape(hashtag) << ""
+ index = hashtag_end
+ next
+ end
+ end
+
+ html << HTML.escape(character.to_s)
+ index += 1
+ end
+ end
+ end
+
+ private def hashtag_character?(character : Char) : Bool
+ character.alphanumeric? || character == '_'
+ end
+
+ private def hashtag_prefix_character?(character : Char) : Bool
+ hashtag_character?(character) || character == '&'
+ end
+
# A handy structure to pass many elements at
# once to the download widget function
struct VideoAssets
diff --git a/src/invidious/views/watch.ecr b/src/invidious/views/watch.ecr
index 3dc19c9e2..819847c31 100644
--- a/src/invidious/views/watch.ecr
+++ b/src/invidious/views/watch.ecr
@@ -93,7 +93,7 @@ we're going to need to do it here in order to allow for translations.