Prohibited Keyword under PreCommit Hook

config/default.yml

@@ -477,6 +477,14 @@ PreCommit:
     flags: ['--standard=PSR2', '--report=csv']
     include: '**/*.php'
 
+  ProhibitedKeyword:
+    enabled: false
+    description: 'Check for prohibited keywords'
+    keywords:
+      - console.log(
+      - binding.pry
+      - eval(
+
   Pronto:
     enabled: false
     description: 'Analyzing with pronto'

lib/overcommit/hook/pre_commit/prohibited_keyword.rb

@@ -0,0 +1,27 @@
+module Overcommit::Hook::PreCommit
+  class ProhibitedKeyword < Base
+    def run
+      errors = []
+
+      applicable_files.each do |file|
+        if File.read(file) =~ /(#{formatted_keywords})/
+          errors << "#{file}: contains prohibited keyword.`"
+        end
+      end
+
+      return :fail, errors.join("\n") if errors.any?
+
+      :pass
+    end
+
+    private
+
+    def formatted_keywords
+      prohibited_keywords.map { |keyword| Regexp.quote(keyword) }.join('|')
+    end
+
+    def prohibited_keywords
+      @prohibited_keywords ||= Array(config['keywords'])
+    end
+  end
+end

spec/overcommit/hook/pre_commit/prohibited_keyword_spec.rb

@@ -0,0 +1,49 @@
+require 'spec_helper'
+require 'overcommit/hook_context/pre_push'
+
+describe Overcommit::Hook::PreCommit::ProhibitedKeyword do
+  let(:hook_config) { { keywords: ['console.log(', 'eval('] } }
+  let(:config) { Overcommit::ConfigurationLoader.default_configuration }
+  subject { described_class.new(config, context) }
+
+  context 'with blacklisted keyword' do
+    let(:file) { create_file('console.log("hello")') }
+
+    context 'with matching file' do
+      let(:context) { double('context', modified_files: [file.path]) }
+
+      it { should fail_hook /contains prohibited keyword./ }
+    end
+
+    context 'without matching file' do
+      let(:context) { double('context', modified_files: []) }
+
+      it { should pass }
+    end
+  end
+
+  context 'without blacklisted keyword' do
+    let(:file) { create_file('alert("hello")') }
+
+    context 'with matching file' do
+      let(:context) { double('context', modified_files: [file.path]) }
+
+      it { should pass }
+    end
+
+    context 'without matching file' do
+      let(:context) { double('context', modified_files: []) }
+
+      it { should pass }
+    end
+  end
+
+  private
+
+  def create_file(content)
+    Tempfile.new('index.html').tap do |file|
+      file.write(content)
+      file.close
+    end
+  end
+end