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# Arcanist Linters
This is a collection of custom [Arcanist][] linters that we've written at
Pinterest.
- [Apache Thrift](#apache-thrift)
- [Apache Thrift Generated](#apache-thrift-generated)
- [Black](#black)
- [Checkstyle](#checkstyle)
- [ESLint](#eslint)
- [Flake8](#flake8)
- [Go Vet](#go-vet)
- [Prettier](#prettier)
- [Prettier ESLint](#prettier-eslint)
- [Python Imports](#python-imports)
- [Python isort](#python-isort)
- [Python Requirements](#python-requirements)
We also welcome additional [contributions](CONTRIBUTING.md).
## Linters
### Apache Thrift
Lints for errors in [Apache Thrift][] IDL (schema) files using the `thrift`
compiler.
```json
{
"type": "thrift",
"include": "(\\.thrift$)",
"flags": [
"--allow-64bit-consts"
],
"version": ">= 0.9.0",
"thrift.generators": [
"py:dynamic,utf8strings,new_style,slots",
"java",
"go",
"erl"
],
"thrift.includes": [
".",
"common"
]
}
```
[Apache Thrift]: http://thrift.apache.org/
### Apache Thrift Generated
Lints files generated by the [Apache Thrift][] compiler to ensure they were
generated using a supported Thrift compiler.
```json
{
"type": "thrift-gen",
"include": "(^schemas/.*\\.py$)",
"thrift-gen.version": ">=0.9.3"
}
```
*Note:* Currently only generated Python files are supported.
### Black
Uses the [Black](https://black.readthedocs.io/) opinionated code formatter
to normalize the format of Python code.
```json
{
"type": "black",
"include": "(\\.py$)",
"flags": ["-S", "--line-length=132"]
}
```
### Checkstyle
Uses the [Checkstyle](http://checkstyle.sourceforge.net/) tool to check Java
code against a coding standard.
```json
{
"type": "checkstyle",
"include": "(\\.java$)",
"checkstyle.config": "google_check.xml"
}
```
### ESLint
Lints JavaScript and JSX files using [ESLint](https://eslint.org/).
```json
{
"type": "eslint",
"include": "(\\.js$)",
"bin": "./node_modules/.bin/eslint",
"eslint.config": "~/my-eslint.json",
"eslint.env": "browser,node"
}
```
### Flake8
Lints Python source files using [Flake8](http://flake8.pycqa.org/). This is an
extended version of the stock `ArcanistFlake8Linter` that adds support for
checking required Python and extension versions.
```json
{
"type": "flake8ext",
"include": "(\\.py$)",
"flake8.python": "< 3.0",
"flake8.extensions": {
"assertive": "1.0.1",
"naming": "0.7.0"
}
}
```
### Go Vet
Uses the [Go vet command](https://golang.org/cmd/vet/) to lint for suspicious
code constructs.
```json
{
"type": "govet",
"include": "(^src/example.com/.*\\.go$)"
}
```
### Prettier
Formats JavaScript using [Prettier](https://prettier.io/).
```json
{
"type": "prettier",
"include": "(\\.js$)",
"bin": "./node_modules/.bin/prettier",
"prettier.cwd": "./"
}
```
### Prettier ESLint
Formats JavaScript using [Prettier](https://prettier.io/) and then fixes with [ESLint](https://eslint.org/).
```json
{
"type": "prettier-eslint",
"include": "(\\.js$)",
"bin": "./node_modules/.bin/prettier-eslint",
"prettier-eslint.cwd": "./"
}
```
### Python Imports
Lints for illegal Python module imports.
```json
{
"type": "python-imports",
"python-imports.pattern": "(mock)",
"include": "(\\.py$)",
"exclude": "(^tests/)"
}
```
### Python isort
Lints Python imports using [isort](https://github.com/timothycrosley/isort).
```json
{
"type": "isort",
"include": "(\\.py$)"
}
```
### Python Requirements
Ensures Python package requirements in [requirements.txt files][req-txt] are
sorted, unique, and pinned to exact versions.
```json
{
"type": "requirements-txt",
"include": "(requirements.txt$)"
}
```
Individual requirement lines can be excluded by adding a `# noqa` comment:
```
six>=1.10.0 # noqa: allow any recent version of six
```
[req-txt]: https://pip.readthedocs.org/en/latest/user_guide/#requirements-files
## Installation
In short, you'll need to add this repository to your local machine and tell
Arcanist to load the extension. You either can do this globally or on a
per-project basis.
Once installed, the individual linters can be enabled and configured via the
project's `.arclint` file. See the [Arcanist Lint User Guide][lint-guide] for
details.
## Global Installation
Arcanist can load modules from an absolute path, but because it also searches
for modules one level up from itself on the filesystem, it's convenient to
clone this repository at the same level as `arcanist` and `libphutil`.
```
$ git clone https://github.com/pinterest/arcanist-linters.git pinterest-linters
$ ls
arcanist
pinterest-linters
libphutil
```
Then, tell Arcanist to load the module by editing `~/.arcconfig` (or
`/etc/arcconfig`):
```json
{
"load": ["pinterest-linters"]
}
```
## Project Installation
You can also load `arcanist-linters` on a per-project basis. In that case,
using a [git submodule](https://git-scm.com/docs/git-submodule) is probably
the most convenient approach.
```
$ git submodule add https://github.com/pinterest/arcanist-linters.git .pinterest-linters
$ git submodule update --init
```
Then, enable the module in your project-level `.arcconfig` file:
```json
{
"load": [".pinterest-linters"]
}
```
[Arcanist]: https://secure.phabricator.com/book/phabricator/article/arcanist/
[lint-guide]: https://secure.phabricator.com/book/phabricator/article/arcanist_lint/

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