Rubocop::I18n

A set of cops for detecting strings that need i18n decoration in your project.

Supports the following framework styles:

• gettext
• rails-i18n

Installation

Add this line to your application's Gemfile:

gem 'rubocop-i18n'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rubocop-i18n

Usage

In your rubocop.yml:

require:
 - rubocop-i18n
...
# You *must* choose GetText or Rails-i18n style checking
# If you want GetText-style checking
I18n/GetText:
  Enabled: true
I18n/RailsI18n:
  Enabled: false
# If you want rails-i18n-style checking
I18n/RailsI18n:
  Enabled: true
I18n/GetText:
  Enabled: false
# If you want custom control of all the cops
I18n/GetText/DecorateString:
  Enabled: false
  # Disable the autocorrect
  AutoCorrect: false
I18n/GetText/DecorateFunctionMessage:
  Enabled: false
I18n/GetText/DecorateStringFormattingUsingInterpolation:
  Enabled: false
I18n/GetText/DecorateStringFormattingUsingPercent:
  Enabled: false
I18n/RailsI18n/DecorateString:
  Enabled: false

Cops

I18n/GetText/DecorateString

This cop is looks for strings that appear to be sentences but are not decorated. Sentences are determined by the STRING_REGEXP.

Error message thrown

decorator is missing around sentence

Bad

"Result is bad."

Good

_("Result is good.")

Ignored

"string"
"A string with out a punctuation at the end"
"a string that doesn't start with a capital letter."

I18n/GetText/DecorateFunctionMessage

This cop looks for any raise or fail functions and checks that the user visible message is using gettext decoration with the _() function. This cop makes sure the message is decorated, as well as checking that the formatting of the message is compliant according to the follow rules. This cop supports autocorrecting of Simple decoration of a message. See the rubocop documentation on how to run autocorrect.

Simple decoration of a message

Simple message strings should be decorated with the _() function

Error message thrown

'raise' function, message string should be decorated

Bad

raise("Warning")

Good

raise(_("Warning"))

Multi-line message

The message should not span multiple lines, it causes issues during the translation process.

Error message thrown

'raise' function, message should not be a multi-line string

Bad

raise("this is a multi" \
"line message")

Good

raise(_("this is a multi line message"))

Concatenated message

The message should not concatenate multiple strings, it causes issues during translation and with the gettext.

Error message thrown

'raise' function, message should not be a concatenated string

Bad

raise("this is a concatenated" + "message")

Good

raise(_("this is a concatenated message"))

Interpolated message

The message should be formated in this particular style. Otherwise it causes issues during translation and with the gettext gem.

Error message thrown

'raise' function, message should use correctly formatted interpolation

Bad

raise("this is an interpolated message IE #{variable}")

Good

raise(_("this is an interpolated message IE %{value0}") % {value0: var,})

No decoration and no string detected

The raise or fail function does not contain any decoration, or a simple string

Error message thrown

'raise' function, message should be decorated

Bad

raise(someOtherFuntioncall(foo, "bar"))

Good

In this raise or fail function, the message does not contain any decoration at all and the message is not a simple string. It may make sense to convert the message to a simple string. eg Simple decoration of a message. Or ignore this raise or fail function following this How to ignore rules in code section.

I18n/GetText/DecorateStringFormattingUsingInterpolation

This cop looks for decorated gettext methods _() and checks that all strings contained within do not use string interpolation '#{}'

Simple decoration of a message

Simple message strings should be decorated with the _() function

Error message thrown

'_' function, message string should not contain #{} formatting

Bad

puts _("a message with a #{'interpolation'}")

Good

puts _("a message that is %{type}") % { type: 'translatable' }

I18n/GetText/DecorateStringFormattingUsingPercent

This cop looks for decorated gettext methods _() and checks that all strings contained within do not use sprintf formatting '%s' etc

Error message thrown

'_' function, message string should not contain sprintf style formatting (ie %s)

Bad

raise(_("Warning is %s") % ['bad'])

Good

raise(_("Warning is %{value}") % { value: 'bad' })

I18n/RailsI18n/DecorateString

This cop looks for decorated rails-i18n methods.

Error message thrown

decorator is missing around sentence

Bad

raise("Warning is %s" % ['bad'])

Good

raise(t("Warning is %{value}") % { value: 'good' })
raise(translate("Warning is %{value}") % { value: 'good' })
raise(I18n.t("Warning is %{value}") % { value: 'good' })

I18n/RailsI18n/DecorateStringFormattingUsingInterpolation

This cop looks for decorated rails-i18n methods like t() and translate() and checks that all strings contained within do not use string interpolation '#{}'

Simple decoration of a message

Simple message strings should be decorated with the t() function

Error message thrown

't' function, message key string should not contain #{} formatting

Bad

puts t("path.to.key.with.#{'interpolation'}")

Good

puts t("path.to.key.with.interpolation")

How to ignore rules in code

It may be necessary to ignore a cop for a particular piece of code. We follow standard rubocop idioms.

raise("We don't want this translated.")                 # rubocop:disable I18n/GetText/DecorateString
raise("We don't want this translated.")                 # rubocop:disable I18n/RailsI18n/DecorateString
raise("We don't want this translated")                  # rubocop:disable I18n/GetText/DecorateFunctionMessage
raise(_("We don't want this translated #{crazy}")       # rubocop:disable I18n/GetText/DecorateStringFormattingUsingInterpolation)
raise(_("We don't want this translated %s") % ['crazy'] # rubocop:disable I18n/GetText/DecorateStringFormattingUsingPercent)

Known Issues

Rubocop currently does not detect Heredoc style messages in functions correctly, which in turn prevents this plugin from detecting them correctly. Not all sprintf formatting strings are detected.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that allows you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which creates a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/puppetlabs/rubocop-i18n. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.