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Lint

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prototool lint lints your Protobuf files.

Lint rules can be set using the configuration file. See the configuration at etc/config/example/prototool.yaml for all available options. There are three pre-configured groups of rules, the setting of which is integral to the prototool lint, prototool create, and prototool format commands:

  • uber2: This lint group follows the V2 Uber Style Guide, and makes some modifications to more closely follow the Google Cloud APIs file structure, as well as adding even more rules to enforce more consistent development patterns. This is the lint group we recommend using.
  • uber1: This lint group follows the V1 Uber Style Guide. For backwards compatibility reasons, this is the default lint group, however we recommend using the uber2 lint group.
  • google: This lint group follows the Google Style Guide. This is a small group of rules meant to enforce basic naming. The style guide is copied to etc/style/google/google.proto.

To see the differences between lint groups, use the --diff-lint-groups flag:

prototool lint --diff-lint-groups uber1,uber2

Configuration of your group can be done by setting the lint.group option in your prototool.yaml file:

lint:
  group: uber2

See the prototool.yaml files at etc/style/google/prototool.yaml and etc/style/uber1/prototool.yaml for examples.

There is also the special lint group empty, which has no lint rules. This allows one to specify only the linters they want in lint.rules.add:

lint:
  group: empty
  rules:
    add:
      - MESSAGE_NAMES_CAMEL_CASE
      - MESSAGE_NAMES_CAPITALIZED

You can configure ignoring of lint rules on a per-file basis:

lint:
  ignores:
    - id: MESSAGE_NAMES_CAMEL_CASE
      files:
        - foo.proto
        - bar/baz.proto

To generate the a YAML configuration for currently-failing lint rules that can be copied into your configuration file, use --generate-ignores. This will lint your files, ignoring the existing setting for lint.ignores, and print a new value for it. Note that you should make sure not to touch other settings for lint in your configuration file as this flag only generates the lint.ignores option.

prototool lint path/to/dir --generate-ignores

Linting also understands the concept of file headers, typically license headers. To specify a file header, add the following to your prototool.yaml:

lint:
  file_header:
    path: path/to/header.txt
    is_commented: true

Alternatively, directly specify the content:

lint:
  file_header:
    content: |
      //
      // Acme, Inc. (c) 2019
      //
    is_commented: true

The path option specifies the path to the file that contains the header data. The content option specifies the content directly. Only one of these can be specified. The is_commented option specifies whether the header data is already commented, and if not, // will be added before all non-empty lines, and // will be added before all empty lines. is_commented is optional and generally will not be set if the file is not commented, for example if path points to a text LICENSE file.

If lint.file_header.path or lint.file_header.content is set, prototool lint, prototool create, and prototool format --fix will all take the file header into account.

See internal/cmd/testdata/lint for additional examples of configurations, and run prototool lint internal/cmd/testdata/lint/DIR from a checkout of this repository to see example failures.

Files must be valid Protobuf that can be compiled with protoc, so prior to linting, prototool lint will compile your using protoc. Note, however, this is very fast - for the two files in etc/style/uber1, compiling and linting only takes approximately 3/100ths of a second:

$ time prototool lint etc/style/uber1

real	0m0.037s
user	0m0.026s
sys	0m0.017s

For all 694 Protobuf files currently in googleapis, this takes approximately 3/4ths of a second:

$ git remote -v
origin	https://github.com/googleapis/googleapis (fetch)
origin	https://github.com/googleapis/googleapis (push)

$ cat prototool.yaml
protoc:
  allow_unused_imports: true
lint:
  group: google

$ time prototool lint

real	0m0.734s
user	0m3.835s
sys	0m0.924s