Add stylelint to pre-commit hook

README.md

@@ -542,6 +542,7 @@ issue](https://github.com/brigade/overcommit/issues/238) for more details.
 * [SlimLint](lib/overcommit/hook/pre_commit/slim_lint.rb)
 * [Sqlint](lib/overcommit/hook/pre_commit/sqlint.rb)
 * [Standard](lib/overcommit/hook/pre_commit/standard.rb)
+* [StyleLint](lib/overcommit/hook/pre_commit/style_lint.rb)
 * [TrailingWhitespace](lib/overcommit/hook/pre_commit/trailing_whitespace.rb)
 * [TravisLint](lib/overcommit/hook/pre_commit/travis_lint.rb)
 * [TsLint](lib/overcommit/hook/pre_commit/ts_lint.rb)

config/default.yml

@@ -641,6 +641,15 @@ PreCommit:
     install_command: 'npm install -g standard'
     include: '**/*.js'
 
+  StyleLint:
+    enabled: false
+    description: 'Analyze with Stylelint'
+    required_executable: 'stylelint'
+    install_command: 'npm install -g stylelint'
+    include:
+      - '**/*.scss'
+      - '**/*.css'
+
   TsLint:
       enabled: false
       description: 'Analyze with TSLint'

lib/overcommit/hook/pre_commit/style_lint.rb

@@ -0,0 +1,23 @@
+module Overcommit::Hook::PreCommit
+  # Runs `stylelint` against any modified CSS files.
+  #
+  # @see https://github.com/stylelint/stylelint
+  class StyleLint < Base
+    MESSAGE_REGEX = /(?<type>✖|⚠)
+      ((?<file>(\/\D+)*\D+\.\D+))
+      ((?<line>\d+):)
+    /x
+
+    def run
+      result = execute(command, args: applicable_files)
+      output = result.stdout.chomp
+      return :pass if result.success? && output.empty?
+
+      extract_messages(
+        output.split("\n").reject(&:empty?),
+        MESSAGE_REGEX,
+        lambda { |type| type.downcase.to_sym }
+      )
+    end
+  end
+end

lib/overcommit/version.rb

@@ -2,5 +2,5 @@
 
 # Defines the gem version.
 module Overcommit
-  VERSION = '0.41.0'.freeze
+  VERSION = '0.42.0'.freeze
 end