Support a branch in detached HEAD state

Fix issue whitesmith#346 This commit prevents `sh: 1: Syntax error: "(" unexpected` error and completes the run with compare mode successfully.
h-r-k-matsumoto · Jan 11, 2023 · 956c765 · 956c765
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,7 @@
 * [CHANGE] Fix some typos (by [@ydah][])
 * [CHANGE] Remove wrong Rubocop reference in contributing file (by [@itsmeurbi]: https://github.com/itsmeurbi)
 * [BUGFIX] Restore missing smell status label (by [@itsmeurbi]: https://github.com/itsmeurbi)
+* [FEATURE] Support a branch in 'detached HEAD' state (by [@h-r-k-matsumoto]: https://github.com/h-r-k-matsumoto)
 
 # v4.7.0 / 2022-05-06 [(commits)](https://github.com/whitesmith/rubycritic/compare/v4.6.1...v4.7.0)
 

diff --git a/lib/rubycritic/source_control_systems/git.rb b/lib/rubycritic/source_control_systems/git.rb
@@ -81,7 +81,9 @@ def self.modified_files
 
       def self.current_branch
         branch_list = `git branch`
-        branch_list.match(/\*.*$/)[0].gsub('* ', '')
+        branch = branch_list.match(/\*.*$/)[0].gsub('* ', '')
+        branch = branch.gsub(/\(HEAD detached at (.*)\)$/, '\1') if branch =~ /\(HEAD detached at (.*)\)$/
+        branch
       end
 
       private