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# gulp-scss-lint
[![Build Status](https://travis-ci.org/juanfran/gulp-scss-lint.svg?branch=master)](https://travis-ci.org/juanfran/gulp-scss-lint)
> Lint your `.scss` files
## Install
```shell
npm install gulp-scss-lint --save-dev
```
This plugin requires Ruby and [scss-lint](https://github.com/brigade/scss-lint)
```shell
gem install scss_lint
```
## Usage
`gulpfile.js`
```js
var scsslint = require('gulp-scss-lint');
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(scsslint());
});
```
## Api
#### config
- Type: `String`
- Default: [default scss-lint config file](https://github.com/brigade/scss-lint/blob/master/config/default.yml).
```js
scsslint({
'config': 'lint.yml'
});
```
#### bundleExec
- Type: `Boolean`
- Default: `false`
If your gem is installed via [bundler](http://bundler.io), then set this option to `true`
```js
scsslint({
'bundleExec': true
});
```
#### reporterOutput
- Type: `String`
- Default: `null`
If you want to save the report to a file then set reporterOutput with a file name
```js
scsslint({
'reporterOutput': 'scssReport.json'
});
```
#### reporterOutputFormat
- Type: `String`
- Default: `JSON`
- Values: `JSON` or `Checkstyle`
```js
gulp.src(['**/*.scss'])
.pipe(scsslint({
'reporterOutputFormat': 'Checkstyle',
}))
```
#### filePipeOutput
- Type: `String`
- Default: `null`
If you want the pipe return a report file instead of the `.scss` file then set filePipeOutput with a filename
```js
//xml
gulp.src(['**/*.scss'])
.pipe(scsslint({
'reporterOutputFormat': 'Checkstyle',
'filePipeOutput': 'scssReport.xml'
}))
.pipe(gulp.dest('./reports'))
//json
gulp.src(['**/*.scss'])
.pipe(scsslint({
'filePipeOutput': 'scssReport.json'
}))
.pipe(gulp.dest('./reports'))
```
#### maxBuffer
- Type: Number or Boolean
- Default: 300 * 1024
Set maxBuffer for the child_process.exec process. If you get a `maxBuffer exceeded` error, set it with a higher number. maxBuffer specifies the largest amount of data allowed on stdout or stderr.
```js
gulp.src(['**/*.scss'])
.pipe(scsslint({
'maxBuffer': 307200
}))
.pipe(gulp.dest('./reports'))
```
#### endless
- Type: Boolean
- Default: false
If you use gulp-watch set endless to true.
#### sync
- Type: Boolean
- Default: sync
`scss-lint` will be executed in sequence.
#### verbose
- Type: Boolean
- Default: false
If you want to see the executed scss-lint command for debugging purposes, set this to true.
## Glob pattern without gulp.src
```js
var scsslint = require('gulp-scss-lint');
gulp.task('scss-lint', function() {
return scsslint({
shell: 'bash', // your shell must support glob
src: '**/*.scss'
});
});
```
## Excluding
To exclude files you should use the gulp.src ignore format '!filePath''
```js
gulp.src(['/scss/*.scss', '!/scss/vendor/**/*.scss'])
.pipe(scsslint({'config': 'lint.yml'}));
```
Or you should use [gulp-filter](https://github.com/sindresorhus/gulp-filter)
```js
var scsslint = require('gulp-scss-lint');
var gulpFilter = require('gulp-filter');
gulp.task('scss-lint', function() {
var scssFilter = gulpFilter('/scss/vendor/**/*.scss');
return gulp.src('/scss/*.scss')
.pipe(scssFilter)
.pipe(scsslint())
.pipe(scssFilter.restore());
});
```
## Lint only modified files
You should use [gulp-cached](https://github.com/wearefractal/gulp-cached)
In this example, without the gulp-cached plugin, every time you save a `.scss` file the scss-lint plugin will check all your files. In case you have gulp-cached plugin, it will only check the modified files.
```js
var scsslint = require('gulp-scss-lint');
var cache = require('gulp-cached');
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(cache('scsslint'))
.pipe(scsslint());
});
gulp.task('watch', function() {
gulp.watch('/scss/*.scss', ['scss-lint']);
});
```
## Results
Adds the following properties to the file object:
```js
file.scsslint = {
'success': false,
'errors': 0,
'warnings': 1,
'issues': [
{
'line': 123,
'column': 10,
'severity': 'warning', // or `error`
'reason': 'a description of the error'
}
]
};
```
The issues have the same parameters that [scss-lint](https://github.com/brigade/scss-lint#checkstyle)
## Custom reporter
You can replace the default console log by a custom output with `customReport`. customReport function will be called for each file that includes the lint results [See result params](#results)
```js
var scsslint = require('gulp-scss-lint');
var myCustomReporter = function(file) {
if (!file.scsslint.success) {
gutil.log(file.scsslint.issues.length + ' issues found in ' + file.path);
}
};
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(scsslint({
customReport: myCustomReporter
}))
});
```
You can even throw an exception
```js
var scsslint = require('gulp-scss-lint');
var myCustomReporter = function(file, stream) {
if (!file.scsslint.success) {
stream.emit('error', new gutil.PluginError("scss-lint", "some error"));
}
};
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(scsslint({
customReport: myCustomReporter
}))
});
```
## Default reporter
This is an example from the default reporter output
```shell
[20:55:10] 3 issues found in test/fixtures/invalid.scss
[20:55:10] test/fixtures/invalid.scss:1 [W] IdSelector: Avoid using id selectors
[20:55:10] test/fixtures/invalid.scss:2 [W] Indentation: Line should be indented 2 spaces, but was indented 0 spaces
[20:55:10] test/fixtures/invalid.scss:2 [W] EmptyRule: Empty rule
```
## Fail reporter
If you want the task to fail when "scss-lint" was not a success then call `failReporter` after the scsslint call.
This example will log the issues as usual and then fails if there is any issue.
```js
var scsslint = require('gulp-scss-lint');
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(scsslint())
.pipe(scsslint.failReporter())
});
```
if you just want `failReporter` to fail just with errors pass the 'E' string
```js
var scsslint = require('gulp-scss-lint');
gulp.task('scss-lint', function() {
return gulp.src('/scss/*.scss')
.pipe(scsslint())
.pipe(scsslint.failReporter('E'))
});
```
## Testing
To test you must first have `scss-lint` installed globally using
`gem install scss_lint` as well as via bundler using `bundle install`.