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170 lines
4.7 KiB
Markdown
170 lines
4.7 KiB
Markdown
<p align="center">
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<img src="https://gitcdn.link/repo/veelenga/bin/master/ameba/logo.png" width="200">
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<h3 align="center">Ameba</h3>
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<p align="center">Code style linter for Crystal<p>
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<p align="center">
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<sup>
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<i> (a single-celled animal that catches food and moves about by extending fingerlike projections of protoplasm) </i>
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</sup>
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</p>
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<p align="center">
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<a href="https://travis-ci.org/veelenga/ameba"><img src="https://travis-ci.org/veelenga/ameba.svg?branch=master"></a>
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<a href="https://github.com/veelenga/ameba/releases"><img src="https://img.shields.io/github/release/veelenga/ameba.svg?maxAge=360"></a>
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<a href="https://github.com/veelenga/ameba/blob/master/LICENSE"><img src="https://img.shields.io/github/license/veelenga/ameba.svg"></a>
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<a href="https://gitter.im/veelenga/ameba?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge"><img src="https://badges.gitter.im/veelenga/ameba.svg"></a>
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</p>
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</p>
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## About
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Ameba is a static code analysis tool for the Crystal language.
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It enforces a consistent [Crystal code style](https://crystal-lang.org/docs/conventions/coding_style.html),
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also catches code smells and wrong code constructions.
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See also [Roadmap](https://github.com/veelenga/ameba/wiki).
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## Usage
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Run `ameba` binary within your project directory to catch code issues:
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```sh
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$ ameba
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Inspecting 107 files.
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...............F.....................F....................................................................
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src/ameba/formatter/flycheck_formatter.cr:4:33
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Lint/UnusedArgument: Unused argument `location`
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> source.issues.each do |e, location|
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^
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src/ameba/formatter/base_formatter.cr:12:7
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Lint/UselessAssign: Useless assignment to variable `s`
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> return s += issues.size
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^
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Finished in 542.64 milliseconds
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129 inspected, 2 failures.
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```
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## Installation
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### As a project dependency:
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Add this to your application's `shard.yml`:
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```yaml
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development_dependencies:
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ameba:
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github: veelenga/ameba
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version: 0.8.1
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```
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Build `bin/ameba` binary within your project directory while running `shards install`.
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You may also want to use it on [Travis](travis-ci.org):
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```yaml
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# .travis.yml
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language: crystal
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install:
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- shards install
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script:
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- crystal spec
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- bin/ameba
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```
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Using this config Ameba will inspect files just after the specs run. Travis will also fail
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the build if some problems detected.
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### OS X
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```sh
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$ brew tap veelenga/tap
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$ brew install ameba
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```
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### Docker
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Build the image:
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```sh
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$ docker build -t ameba/ameba .
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```
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To use the resulting image on a local source folder, mount the current (or target) directory into `/src`:
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```sh
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$ docker run -v $(pwd):/src ameba/ameba
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```
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### From sources
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```sh
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$ git clone https://github.com/veelenga/ameba && cd ameba
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$ make install
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```
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## Configuration
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Default configuration file is `.ameba.yml`.
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It allows to configure rule properties, disable specific rules and exclude sources from the rules.
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Generate new file by running `ameba --gen-config`.
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### Only/Except
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One or more rules, or a one or more group of rules can be included or excluded
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via command line arguments:
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```
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$ ameba --only Lint/Syntax # runs only Lint/Syntax rule
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$ ameba --only Style,Lint # runs only rules from Style and Lint groups
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$ ameba --except Lint/Syntax # runs all rules except Lint/Syntax
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$ ameba --except Style,Lint # runs all rules except rules in Style and Lint groups
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```
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### Explanation
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Ameba allows you to dig deeper into an issue, by showing you details about the issue
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and the reasoning by it being reported.
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To be convenient, you can just copy-paste the `PATH:line:column` string from the
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report and paste behind the `ameba` command to check it out.
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```
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$ ameba crystal/command/format.cr:26:83 # show explanation for the issue
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$ ameba --explain crystal/command/format.cr:26:83 # same thing
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```
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### Inline disabling
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One or more rules or one or more group of rules can be disabled using inline directives:
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```crystal
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# ameba:disable Style/LargeNumbers
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time = Time.epoch(1483859302)
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time = Time.epoch(1483859302) # ameba:disable Style/LargeNumbers, Lint/UselessAssign
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time = Time.epoch(1483859302) # ameba:disable Style, Lint
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```
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## Editor integration
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* Vim: [vim-crystal](https://github.com/rhysd/vim-crystal) (via [Syntastic](https://github.com/vim-syntastic/syntastic))
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* Emacs: [ameba.el](https://github.com/veelenga/ameba.el)
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* Sublime Text: [Sublime Linter Ameba](https://github.com/epergo/SublimeLinter-contrib-ameba)
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## Credits & inspirations
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- [Crystal Language](crystal-lang.org)
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- [Rubocop](http://rubocop.readthedocs.io/en/latest/)
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- [Credo](http://credo-ci.org/)
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- [Dogma](https://github.com/lpil/dogma)
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## Contributors
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- [veelenga](https://github.com/veelenga) Vitalii Elenhaupt - creator, maintainer
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