Plugin for creating several versions of files according to the environment needs. Search lines for defined pattern and remove it
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Remove lines that match defined patterns within comments sections. Build several versions of file

Getting Started

This plugin requires Grunt ~0.4.1

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-grep --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:


The "grep" task


Create several versions of one file for different environments, needs etc. Handle several files which not differ much in one file with help of comments. Handle browser-specific features for building different html, css, js or any other files for better user experience by delivering no more instructions than is required.

In your project's Gruntfile, add a section named grep to the data object passed into grunt.initConfig().

	grep: {
		production: {
			files: {
				'tmp/boot.css': ['test/fixtures/boot.css'], //dest file with lines matching pattern excluded: src files
				'tmp/styles': ['test/fixtures/*.styl'] //src could be presented as a wildcard, new files with corresponding names will be created in the dest folder
			options: {
				pattern: 'dev' //your pattern that will be excluded from file

Basic comment types supported

  • slash_asterisk /* */: .css, .c, .h
  • slash_slash //: .js, .styl, .jade, .cs, .m, .java, .php
  • tag_comment : .xml, .html
  • sharp #: .coffee, .py, .rb, .sh, .pl
  • dash_dash -- .hs, .sql
  • single_quote ' .vb
  • bracket_asterisk (* *) .scpt
  • equal_sign =

Grep works with one line comments. Multi-line support is implemented with help of startPattern and endPattern options.


pattern Type: String
pattern for matching lines that should be removed (e.g. 'not_important')

startPattern Type: String default :s
grep can remove several lines by looking for opening and ending pattern. (comment should be //@grep not_important:s)

endPattern Type: String default :e
ending pattern for multi-line support. (comment should be //@grep not_important:e)

denotation Type: String default @grep
string which tells grep if he should look at this line. Value could be '' so that each line is looped throw by grep.
Warning denotation only works for known file types. for others grep will just look for pattern passed.

fileOverride Type: Boolean default false
if grep finds out that dest file exists, it file remove it first.

removeDenotationComments Type: Boolean default true
tells if all the denotation comments (//@grep as a default one) should be removed

exclude Type: Boolean default false
determines if we should delete line with pattern (for false) or all others @grep lines (for true)

commentType Type: Boolean default undefined
point the grep to which comment type pattern to apply to this file. Overrides extension-defined pattern. Possible values: slash_asterisk, slash_slash, tag_comment, sharp, dash_dash, single_quote

isDestAFile Type: Boolean default false
when specifying a dest looking like a folder (simply without '.' in name or '/' in the end), grep assumes that it's a folder. Though it can be mistaken. True value will point it.

Basic Usage

Source files


<link rel="stylesheet" href="./style.css"> <!--@grep dev-->
<link rel="stylesheet" href="http://some.cdn/style.css"> <!--@grep production-->


	background-image: url("./style.css"); //@grep dev
	background-image: url("http://some.cdn/style.css"); //@grep production

Grunt grep config

	grep: {
		production: {
			files: {
				'tmp/': ['./index.html', './style.css']
			options: {
				pattern: 'dev'



<link rel="stylesheet" href="http://some.cdn/style.css"> <!--@grep production-->


	background-image: url("http://some.cdn/style.css"); //@grep production

Denotation overriding

Source files


<link rel="stylesheet" href="./style.css"> <!--@condition dev-->
<link rel="stylesheet" href="http://some.cdn/style.css"> <!--@condition production-->

Grunt condition config

	grep: { production: { files: {'tmp/': ['./index.html']}, options: {pattern: 'dev', denotation: '@condition'}}}



<link rel="stylesheet" href="http://some.cdn/style.css"> <!--@grep production-->


Feel free to open issues and suggest pull requests.

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt. Run command npm test which is alias for grunt test.

Especially appreciated is adding file types and comment types.

Versions are assigned according to SemVer specification.

Release History

2013-11-09   v 0.7.0   Update comment type for known file type lookup. Add commentType options.
2013-11-07   v 0.6.0   Add exclude option.
2013-11-04   v 0.5.0   Add denotation option.
2013-10-28   v 0.4.0   Add isDestAFile option. Enhance pattern building. Add tests for majority of functionality.
2013-10-19   v 0.3.0   Refactor into procedural style. Add multifile and wildcards support. Add fileOverride option.