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YamlLint

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Checks YAML files for correct syntax. Currently it checks for:

  • Valid YAML syntax
  • Overlapping key definitions in YAML files, where the last definition would win

This is a YAML version of jsonlint

Installation

Add this line to your application's Gemfile:

gem 'yamllint'

And then execute:

$ bundle

Or install it yourself as:

$ gem install yamllint

Usage

CLI

You can run yamllint against a set of files in the command line. Any errors will be printed and the process will exit with a non-zero exit code.

$ yamllint spec/data/*
spec/data/empty.yaml
  The YAML should not be an empty string
spec/data/invalid.yaml
  (<unknown>): found character that cannot start any token while scanning for the next token at line 1 column 6
spec/data/overlapping_keys.yaml
  The same key is defined more than once: foo
spec/data/overlapping_keys_complex.yaml
  The same key is defined more than once: foo
spec/data/overlapping_keys_deep.yaml
  The same key is defined more than once: foo
spec/data/spaces.yaml
  The YAML should not just be spaces
$

CLI options

Short Long Description Default
-D --debug Debug logging false
-d --disable-ext-check Disable file extension check false
-e --extensions= Add more allowed extensions (comma delimited list) nil
-h --help Show help message false
-v --version Print version and exit false

Rake task

You can integrate yamllint into your build process by adding a Rake task to your project

require 'yamllint/rake_task'
YamlLint::RakeTask.new do |t|
  t.paths = %w(
    spec/**/*.yaml
  )
end

Then run the rake task.

$ rake yamllint
spec/data/empty.yaml
  The YAML should not be an empty string
spec/data/invalid.yaml
  (<unknown>): found character that cannot start any token while scanning for the next token at line 1 column 6
spec/data/overlapping_keys.yaml
  The same key is defined more than once: foo
spec/data/overlapping_keys_complex.yaml
  The same key is defined more than once: foo
spec/data/overlapping_keys_deep.yaml
  The same key is defined more than once: foo
spec/data/spaces.yaml
  The YAML should not just be spaces
$

Rake task options

Add these options similarly to the path option seen above.

| Option | Description | Default | | ------------- | ------------- | ------------- | ------------- | | debug | Debug logging | false | | disable_ext_check | Disable file extension check | false | | exclude_paths | List of files or paths to exclude from linting | nil | | extensions | Add more allowed extensions (list)| nil | | fail_on_error | Continue on to the next rake task and don't fail even if YamlLint finds errors | true | | paths | List of files or paths to lint | nil |

Contributing

  1. Fork it ( https://github.com/shortdudey123/yamllint/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request

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Checks YAML files for correct syntax

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