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127 lines
3.7 KiB
Markdown
127 lines
3.7 KiB
Markdown
<p align="center">
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<img src="https://media.githubusercontent.com/media/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://shards.rocks/badge/github/veelenga/ameba"><img src="https://shards.rocks/badge/github/veelenga/ameba/status.svg"></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 tool for enforcing a consistent Crystal code style, for catching code smells and wrong code constructions.
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Ameba's [rules](src/ameba/rules/) traverse AST and report bad parts of your code.
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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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```
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Build `bin/ameba` binary within your project directory while running `crystal deps`.
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You may want also use it on [Travis](travis-ci.org):
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```yaml
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language: crystal
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install:
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- crystal deps
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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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### 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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### 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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## 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 52 files.
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.........................F.......F........F.........
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src/ameba/ast/traverse.cr:27:5
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PredicateName: Favour method name 'node?' over 'is_node?'
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src/ameba/rules/empty_expression.cr:42:7
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LiteralInCondition: Literal value found in conditional
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src/ameba/rules/empty_expression.cr:30:7
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UnlessElse: Favour if over unless with else
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Finished in 10.53 milliseconds
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52 inspected, 3 failures.
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```
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## Configuration
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It is possible to configure or even disable specific rules using YAML configuration file.
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By default Ameba is looking for `.ameba.yml` in a project root directory.
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Copy and adjust [existed example](config/ameba.yml).
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## Write a new Rule
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Adding a new rule is as simple as inheriting from `Rule::Base` struct and implementing
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your logic to detect a problem:
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```crystal
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struct DebuggerStatement < Rule::Base
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# This is a required method to be implemented by the rule.
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# Source will be passed here. If rule finds an issue in this source,
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# it reports an error:
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#
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# source.error rule, line_number, message
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#
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def test(source)
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# This line deletegates verification to a particular AST visitor.
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AST::Visitor.new self, source
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end
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# This method is called once the visitor finds a required node.
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def test(source, node : Crystal::Call)
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# It reports an error, if there is `debugger` method call
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# without arguments and a receiver. That's it, somebody forgot
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# to remove a debugger statement.
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return unless node.name == "debugger" && node.args.empty? && node.obj.nil?
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source.error self, node.location,
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"Possible forgotten debugger statement detected"
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end
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end
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```
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## Contributors
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- [veelenga](https://github.com/veelenga) Vitalii Elenhaupt - creator, maintainer
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