Add Code owners lexer (#1969)

docs/Languages.md

@@ -23,24 +23,25 @@
 - BrightScript (`brightscript`)
 - 1C (BSL) (`bsl`)
 - C (`c`)
-- Ceylon (`ceylon`)
+- C# (`csharp`)
+- C++ (`cpp`)
 - CFScript (`cfscript`)
+- CMHG (`cmhg`)
+- CMake (`cmake`)
+- CODEOWNERS (`codeowners`)
+- CSS (`css`)
+- CSV Schema (`csvs`)
+- CUDA (`cuda`)
+- Ceylon (`ceylon`)
 - Cisco IOS (`cisco_ios`)
 - Clean (`clean`)
 - Clojure (`clojure`)
-- CMake (`cmake`)
-- CMHG (`cmhg`)
 - CoffeeScript (`coffeescript`)
 - Common Lisp (`common_lisp`)
 - Config File (`conf`)
 - Console (`console`)
 - Coq (`coq`)
-- C++ (`cpp`)
 - Crystal (`crystal`)
-- C# (`csharp`)
-- CSS (`css`)
-- csvs (`csvs`)
-- CUDA (`cuda`)
 - Cypher (`cypher`)
 - Cython (`cython`)
 - D (`d`)

lib/rouge/demos/codeowners

@@ -0,0 +1,6 @@
+# Specify a default Code Owner by using a wildcard:
+* @default-codeowner
+
+/docs/ @all-docs
+
+[Development] @dev-team

lib/rouge/lexers/codeowners.rb

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+module Rouge
+  module Lexers
+    class Codeowners < RegexLexer
+      title 'CODEOWNERS'
+      desc 'Code Owners syntax (https://docs.gitlab.com/ee/user/project/codeowners/reference.html)'
+      tag 'codeowners'
+      filenames 'CODEOWNERS'
+
+      state :root do
+        rule %r/[ \t\r\n]+/, Text::Whitespace
+        rule %r/^\s*#.*$/, Comment::Single
+
+        rule %r(
+          (\^?\[(?!\d+\])[^\]]+\])
+          (\[\d+\])?
+        )x do
+          groups Name::Namespace, Literal::Number
+        end
+
+        rule %r/\S*@\S+/, Name::Function
+
+        rule %r/[\p{Word}\.\/\-\*]+/, Name
+        rule %r/.*\\[\#\s]/, Name
+      end
+    end
+  end
+end

spec/visual/samples/codeowners

@@ -0,0 +1,87 @@
+# This is an example of a CODEOWNERS file.
+# Lines that start with `#` are ignored.
+
+# app/ @commented-rule
+
+# Specify a default Code Owner by using a wildcard:
+* @default-codeowner
+
+# Specify multiple Code Owners by using a tab or space:
+* @multiple @code @owners
+
+# Rules defined later in the file take precedence over the rules
+# defined before.
+# For example, for all files with a filename ending in `.rb`:
+*.rb @ruby-owner
+
+# Files with a `#` can still be accessed by escaping the pound sign:
+\#file_with_pound.rb @owner-file-with-pound
+
+# Specify multiple Code Owners separated by spaces or tabs.
+# In the following case the CODEOWNERS file from the root of the repo
+# has 3 Code Owners (@multiple @code @owners):
+CODEOWNERS @multiple @code @owners
+
+# You can use both usernames or email addresses to match
+# users. Everything else is ignored. For example, this code
+# specifies the `@legal` and a user with email `[email protected]` as the
+# owner for the LICENSE file:
+LICENSE @legal this_does_not_match [email protected]
+
+# Use group names to match groups, and nested groups to specify
+# them as owners for a file:
+README @group @group/with-nested/subgroup
+
+# End a path in a `/` to specify the Code Owners for every file
+# nested in that directory, on any level:
+/docs/ @all-docs
+
+# End a path in `/*` to specify Code Owners for every file in
+# a directory, but not nested deeper. This code matches
+# `docs/index.md` but not `docs/projects/index.md`:
+/docs/* @root-docs
+
+# Include `/**` to specify Code Owners for all subdirectories
+# in a directory. This rule matches `docs/projects/index.md` or
+# `docs/development/index.md`
+/docs/**/*.md @root-docs
+
+# This code makes matches a `lib` directory nested anywhere in the repository:
+lib/ @lib-owner
+
+# This code match only a `config` directory in the root of the repository:
+/config/ @config-owner
+
+# If the path contains spaces, escape them like this:
+path\ with\ spaces/ @space-owner
+
+# Code Owners section:
+[Documentation]
+ee/docs    @docs
+docs       @docs
+
+# Use of default owners for a section. In this case, all files (*) are owned by
+# the dev team except the README.md and data-models which are owned by other teams.
+[Development] @dev-team
+*
+README.md @docs-team
+data-models/ @data-science-team
+
+# This section is combined with the previously defined [Documentation] section:
+[DOCUMENTATION]
+README.md  @docs
+
+# Required section
+[Section name]
+
+# Optional section
+^[Section name]
+
+# Section requiring 5 approvals
+[Section name][5]
+
+# Section with @username as default owner
+[Section name] @username
+
+# Section with @group and @subgroup as default owners and requiring 2 approvals
+[Section name][2] @group @subgroup