From 058dd193603910efb12cba84339474e3e8778c31 Mon Sep 17 00:00:00 2001
From: Sean McGivern <sean@gitlab.com>
Date: Fri, 23 Mar 2018 15:51:28 +0000
Subject: Add ?, !, and : to trailing puncutation excluded from auto-linking

---
 ...44587-autolinking-includes-trailing-exclamation-marks.yml |  5 +++++
 lib/banzai/filter/autolink_filter.rb                         | 11 ++++++-----
 spec/lib/banzai/filter/autolink_filter_spec.rb               | 12 ++++--------
 3 files changed, 15 insertions(+), 13 deletions(-)
 create mode 100644 changelogs/unreleased/44587-autolinking-includes-trailing-exclamation-marks.yml

diff --git a/changelogs/unreleased/44587-autolinking-includes-trailing-exclamation-marks.yml b/changelogs/unreleased/44587-autolinking-includes-trailing-exclamation-marks.yml
new file mode 100644
index 00000000000..636fde601ee
--- /dev/null
+++ b/changelogs/unreleased/44587-autolinking-includes-trailing-exclamation-marks.yml
@@ -0,0 +1,5 @@
+---
+title: Don't capture trailing punctuation when autolinking
+merge_request: 17965
+author:
+type: fixed
diff --git a/lib/banzai/filter/autolink_filter.rb b/lib/banzai/filter/autolink_filter.rb
index 75b64ae9af2..ce401c1c31c 100644
--- a/lib/banzai/filter/autolink_filter.rb
+++ b/lib/banzai/filter/autolink_filter.rb
@@ -21,12 +21,13 @@ module Banzai
       #
       # See http://en.wikipedia.org/wiki/URI_scheme
       #
-      # The negative lookbehind ensures that users can paste a URL followed by a
-      # period or comma for punctuation without those characters being included
-      # in the generated link.
+      # The negative lookbehind ensures that users can paste a URL followed by
+      # punctuation without those characters being included in the generated
+      # link. It matches the behaviour of Rinku 2.0.1:
+      # https://github.com/vmg/rinku/blob/v2.0.1/ext/rinku/autolink.c#L65
       #
-      # Rubular: http://rubular.com/r/JzPhi6DCZp
-      LINK_PATTERN = %r{([a-z][a-z0-9\+\.-]+://[^\s>]+)(?<!,|\.)}
+      # Rubular: http://rubular.com/r/nrL3r9yUiq
+      LINK_PATTERN = %r{([a-z][a-z0-9\+\.-]+://[^\s>]+)(?<!\?|!|\.|,|:)}
 
       # Text matching LINK_PATTERN inside these elements will not be linked
       IGNORE_PARENTS = %w(a code kbd pre script style).to_set
diff --git a/spec/lib/banzai/filter/autolink_filter_spec.rb b/spec/lib/banzai/filter/autolink_filter_spec.rb
index b502daea418..cbb0089bde7 100644
--- a/spec/lib/banzai/filter/autolink_filter_spec.rb
+++ b/spec/lib/banzai/filter/autolink_filter_spec.rb
@@ -122,14 +122,10 @@ describe Banzai::Filter::AutolinkFilter do
     end
 
     it 'does not include trailing punctuation' do
-      doc = filter("See #{link}.")
-      expect(doc.at_css('a').text).to eq link
-
-      doc = filter("See #{link}, ok?")
-      expect(doc.at_css('a').text).to eq link
-
-      doc = filter("See #{link}...")
-      expect(doc.at_css('a').text).to eq link
+      ['.', ', ok?', '...', '?', '!', ': is that ok?'].each do |trailing_punctuation|
+        doc = filter("See #{link}#{trailing_punctuation}")
+        expect(doc.at_css('a').text).to eq link
+      end
     end
 
     it 'includes trailing punctuation when part of a balanced pair' do
-- 
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