Add support for @ prefix on MentionFilter base_url

Author: jeremysmithco

lib/html_pipeline/node_filter/mention_filter.rb

@@ -115,7 +115,8 @@ def link_to_mentioned_user(base_url, login)
         result[:mentioned_usernames] |= [login]
 
         url = base_url.dup
-        url << "/" unless %r{[/~]\z}.match?(url)
+        excluded_prefixes = [%r{[/~]\z}, %r{[/@]\z}]
+        url << "/" unless excluded_prefixes.any? { |excluded_prefix| excluded_prefix.match?(url) }
 
         "<a href=\"#{url << login}\" class=\"user-mention\">" \
           "@#{login}" \

lib/html_pipeline/node_filter/team_mention_filter.rb

@@ -94,7 +94,8 @@ def link_to_mentioned_team(base_url, org, team)
         result[:mentioned_teams] |= [team]
 
         url = base_url.dup
-        url << "/" unless %r{[/~]\z}.match?(url)
+        excluded_prefixes = [%r{[/~]\z}, %r{[/@]\z}]
+        url << "/" unless excluded_prefixes.any? { |excluded_prefix| excluded_prefix.match?(url) }
 
         "<a href=\"#{url << org}/#{team}\" class=\"team-mention\">" \
           "@#{org}/#{team}" \

test/html_pipeline/node_filter/mention_filter_test.rb

@@ -105,6 +105,16 @@ def test_base_url_slash_with_tilde
       )
     end
 
+    def test_base_url_slash_with_at
+      body = "<p>Hi, @jch!</p>"
+      link = '<a href="/@jch" class="user-mention">@jch</a>'
+
+      assert_equal(
+        "<p>Hi, #{link}!</p>",
+        @filter.call(body, context: @context.merge({ base_url: "/@" })),
+      )
+    end
+
     def test_matches_usernames_in_body
       body = "@test how are you?"
 

test/html_pipeline/node_filter/team_mention_filter_test.rb

@@ -115,6 +115,16 @@ def test_base_url_slash_with_tilde
       )
     end
 
+    def test_base_url_slash_with_at
+      body = "<p>Hi, @github/team!</p>"
+      link = '<a href="/@github/team" class="team-mention">@github/team</a>'
+
+      assert_equal(
+        "<p>Hi, #{link}!</p>",
+        @filter.call(body, context: { base_url: "/@" }),
+      )
+    end
+
     def test_multiple_team_mentions
       body = "<p>Hi, @github/whale and @github/donut!</p>"
       link_whale = '<a href="/github/whale" class="team-mention">@github/whale</a>'