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<a href="Ameba/Formatter/FlycheckFormatter.html">FlycheckFormatter</a>
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<a href="Ameba/Formatter/JSONFormatter.html">JSONFormatter</a>
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<a href="Ameba/Formatter/TODOFormatter.html">TODOFormatter</a>
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<a href="Ameba/Formatter/Util.html">Util</a>
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<li class="parent " data-id="ameba/Ameba/Rule" data-name="ameba::rule">
<a href="Ameba/Rule.html">Rule</a>
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<li class=" " data-id="ameba/Ameba/Rule/Base" data-name="ameba::rule::base">
<a href="Ameba/Rule/Base.html">Base</a>
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<a href="Ameba/Rule/Layout.html">Layout</a>
<ul>
<li class=" " data-id="ameba/Ameba/Rule/Layout/LineLength" data-name="ameba::rule::layout::linelength">
<a href="Ameba/Rule/Layout/LineLength.html">LineLength</a>
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<li class=" " data-id="ameba/Ameba/Rule/Layout/TrailingBlankLines" data-name="ameba::rule::layout::trailingblanklines">
<a href="Ameba/Rule/Layout/TrailingBlankLines.html">TrailingBlankLines</a>
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<li class=" " data-id="ameba/Ameba/Rule/Layout/TrailingWhitespace" data-name="ameba::rule::layout::trailingwhitespace">
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<a href="Ameba/Rule/Lint.html">Lint</a>
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<a href="Ameba/Rule/Lint/EmptyEnsure.html">EmptyEnsure</a>
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<a href="Ameba/Rule/Lint/EmptyExpression.html">EmptyExpression</a>
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<a href="Ameba/Rule/Lint/EmptyLoop.html">EmptyLoop</a>
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<li class=" " data-id="ameba/Ameba/Rule/Lint/HashDuplicatedKey" data-name="ameba::rule::lint::hashduplicatedkey">
<a href="Ameba/Rule/Lint/HashDuplicatedKey.html">HashDuplicatedKey</a>
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<li class=" " data-id="ameba/Ameba/Rule/Lint/LiteralInCondition" data-name="ameba::rule::lint::literalincondition">
<a href="Ameba/Rule/Lint/LiteralInCondition.html">LiteralInCondition</a>
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<li class=" " data-id="ameba/Ameba/Rule/Lint/LiteralInInterpolation" data-name="ameba::rule::lint::literalininterpolation">
<a href="Ameba/Rule/Lint/LiteralInInterpolation.html">LiteralInInterpolation</a>
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<a href="Ameba/Rule/Lint/RandZero.html">RandZero</a>
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<a href="Ameba/Rule/Lint/RedundantWithIndex.html">RedundantWithIndex</a>
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<li class=" " data-id="ameba/Ameba/Rule/Lint/RedundantWithObject" data-name="ameba::rule::lint::redundantwithobject">
<a href="Ameba/Rule/Lint/RedundantWithObject.html">RedundantWithObject</a>
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<a href="Ameba/Rule/Lint/ShadowedArgument.html">ShadowedArgument</a>
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<a href="Ameba/Rule/Lint/ShadowedException.html">ShadowedException</a>
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<a href="Ameba/Rule/Lint/ShadowingOuterLocalVar.html">ShadowingOuterLocalVar</a>
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<a href="Ameba/Rule/Lint/SharedVarInFiber.html">SharedVarInFiber</a>
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<a href="Ameba/Rule/Lint/Syntax.html">Syntax</a>
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<a href="Ameba/Rule/Lint/UnneededDisableDirective.html">UnneededDisableDirective</a>
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<a href="Ameba/Rule/Lint/UnusedArgument.html">UnusedArgument</a>
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<a href="Ameba/Rule/Lint/UselessAssign.html">UselessAssign</a>
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<a href="Ameba/Rule/Lint/UselessConditionInWhen.html">UselessConditionInWhen</a>
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<a href="Ameba/Rule/Metrics.html">Metrics</a>
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<a href="Ameba/Rule/Metrics/CyclomaticComplexity.html">CyclomaticComplexity</a>
</li>
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</li>
<li class="parent " data-id="ameba/Ameba/Rule/Performance" data-name="ameba::rule::performance">
<a href="Ameba/Rule/Performance.html">Performance</a>
<ul>
<li class=" " data-id="ameba/Ameba/Rule/Performance/AnyAfterFilter" data-name="ameba::rule::performance::anyafterfilter">
<a href="Ameba/Rule/Performance/AnyAfterFilter.html">AnyAfterFilter</a>
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<li class=" " data-id="ameba/Ameba/Rule/Performance/AnyInsteadOfEmpty" data-name="ameba::rule::performance::anyinsteadofempty">
<a href="Ameba/Rule/Performance/AnyInsteadOfEmpty.html">AnyInsteadOfEmpty</a>
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<li class=" " data-id="ameba/Ameba/Rule/Performance/Base" data-name="ameba::rule::performance::base">
<a href="Ameba/Rule/Performance/Base.html">Base</a>
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<a href="Ameba/Rule/Performance/ChainedCallWithNoBang.html">ChainedCallWithNoBang</a>
</li>
<li class=" " data-id="ameba/Ameba/Rule/Performance/CompactAfterMap" data-name="ameba::rule::performance::compactaftermap">
<a href="Ameba/Rule/Performance/CompactAfterMap.html">CompactAfterMap</a>
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<a href="Ameba/Rule/Performance/FirstLastAfterFilter.html">FirstLastAfterFilter</a>
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<li class=" " data-id="ameba/Ameba/Rule/Performance/FlattenAfterMap" data-name="ameba::rule::performance::flattenaftermap">
<a href="Ameba/Rule/Performance/FlattenAfterMap.html">FlattenAfterMap</a>
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<li class=" " data-id="ameba/Ameba/Rule/Performance/MapInsteadOfBlock" data-name="ameba::rule::performance::mapinsteadofblock">
<a href="Ameba/Rule/Performance/MapInsteadOfBlock.html">MapInsteadOfBlock</a>
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<a href="Ameba/Rule/Performance/SizeAfterFilter.html">SizeAfterFilter</a>
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<li class="parent " data-id="ameba/Ameba/Rule/Style" data-name="ameba::rule::style">
<a href="Ameba/Rule/Style.html">Style</a>
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<a href="Ameba/Rule/Style/ConstantNames.html">ConstantNames</a>
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<a href="Ameba/Rule/Style/IsAFilter.html">IsAFilter</a>
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<a href="Ameba/Rule/Style/IsANil.html">IsANil</a>
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<a href="Ameba/Rule/Style/MethodNames.html">MethodNames</a>
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<a href="Ameba/Rule/Style/NegatedConditionsInUnless.html">NegatedConditionsInUnless</a>
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<a href="Ameba/Rule/Style/PredicateName.html">PredicateName</a>
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<a href="Ameba/Rule/Style/RedundantBegin.html">RedundantBegin</a>
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<a href="Ameba/Rule/Style/RedundantReturn.html">RedundantReturn</a>
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<a href="Ameba/Rule/Style/TypeNames.html">TypeNames</a>
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<a href="Ameba/Rule/Style/UnlessElse.html">UnlessElse</a>
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<a href="Ameba/Rule/Style/VariableNames.html">VariableNames</a>
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<a href="Ameba/Rule/Style/VerboseBlock.html">VerboseBlock</a>
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<li class=" " data-id="ameba/Ameba/Rule/Style/WhileTrue" data-name="ameba::rule::style::whiletrue">
<a href="Ameba/Rule/Style/WhileTrue.html">WhileTrue</a>
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<a href="Ameba/Severity.html">Severity</a>
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<a href="Ameba/SeverityYamlConverter.html">SeverityYamlConverter</a>
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<a href="Ameba/Source.html">Source</a>
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<a href="Ameba/Spec/AnnotatedSource.html">AnnotatedSource</a>
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<a href="Ameba/Spec/BeValid.html">BeValid</a>
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<a href="Ameba/Spec/BeValidExpectation.html">BeValidExpectation</a>
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<li class=" " data-id="ameba/Ameba/Spec/ExpectIssue" data-name="ameba::spec::expectissue">
<a href="Ameba/Spec/ExpectIssue.html">ExpectIssue</a>
</li>
<li class=" " data-id="ameba/Ameba/Spec/Util" data-name="ameba::spec::util">
<a href="Ameba/Spec/Util.html">Util</a>
</li>
</ul>
</li>
<li class=" " data-id="ameba/Ameba/Tokenizer" data-name="ameba::tokenizer">
<a href="Ameba/Tokenizer.html">Tokenizer</a>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="main-content">
<ul>
<li><a href="#about">About</a></li>
<li><a href="#usage">Usage</a>
<ul>
<li><a href="#watch-a-tutorial">Watch a tutorial</a></li>
<li><a href="#run-in-parallel">Run in parallel</a></li>
</ul>
</li>
<li><a href="#installation">Installation</a>
<ul>
<li><a href="#as-a-project-dependency">As a project dependency:</a></li>
<li><a href="#os-x">OS X</a></li>
<li><a href="#docker">Docker</a></li>
<li><a href="#from-sources">From sources</a></li>
</ul>
</li>
<li><a href="#configuration">Configuration</a>
<ul>
<li><a href="#sources">Sources</a></li>
<li><a href="#rules">Rules</a></li>
<li><a href="#explain-issues">Explain issues</a></li>
<li><a href="#inline-disabling">Inline disabling</a></li>
</ul>
</li>
<li><a href="#editors--integrations">Editors &amp; integrations</a></li>
<li><a href="#credits--inspirations">Credits &amp; inspirations</a></li>
<li><a href="#contributors">Contributors</a></li>
</ul>
<h2><a id="about" class="anchor" href="#about">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>About</h2>
<p>Ameba is a static code analysis tool for the Crystal language.
It enforces a consistent <a href="https://crystal-lang.org/reference/conventions/coding_style.html">Crystal code style</a>,
also catches code smells and wrong code constructions.</p>
<p>See also <a href="https://github.com/crystal-ameba/ameba/wiki">Roadmap</a>.</p>
<h2><a id="usage" class="anchor" href="#usage">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Usage</h2>
<p>Run <code>ameba</code> binary within your project directory to catch code issues:</p>
<pre><code class="language-sh">$ ameba
Inspecting 107 files
...............F.....................F....................................................................
src/ameba/formatter/flycheck_formatter.cr:4:33
[W] Lint/UnusedArgument: Unused argument `location`
&gt; source.issues.each do |e, location|
^
src/ameba/formatter/base_formatter.cr:12:7
[W] Lint/UselessAssign: Useless assignment to variable `s`
&gt; return s += issues.size
^
Finished in 542.64 milliseconds
129 inspected, 2 failures</code></pre>
<h3><a id="watch-a-tutorial" class="anchor" href="#watch-a-tutorial">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Watch a tutorial</h3>
<p><a href="https://luckycasts.com/videos/ameba">🎬 Watch the LuckyCast showing how to use Ameba</a></p>
<h3><a id="run-in-parallel" class="anchor" href="#run-in-parallel">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Run in parallel</h3>
<p>Starting from 0.31.0 Crystal <a href="https://crystal-lang.org/2019/09/06/parallelism-in-crystal.html">supports parallelism</a>.
It allows to run linting in parallel too.
In order to take advantage of this feature you need to build ameba with preview_mt support:</p>
<pre><code class="language-sh">$ crystal build src/cli.cr -Dpreview_mt -o bin/ameba
$ make install</code></pre>
<p>Some quick benchmark results measured while running Ameba on Crystal repo:</p>
<pre><code class="language-sh">$ CRYSTAL_WORKERS=1 ameba #=&gt; 29.11 seconds
$ CRYSTAL_WORKERS=2 ameba #=&gt; 19.49 seconds
$ CRYSTAL_WORKERS=4 ameba #=&gt; 13.48 seconds
$ CRYSTAL_WORKERS=8 ameba #=&gt; 10.14 seconds</code></pre>
<h2><a id="installation" class="anchor" href="#installation">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Installation</h2>
<h3><a id="as-a-project-dependency" class="anchor" href="#as-a-project-dependency">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>As a project dependency:</h3>
<p>Add this to your application's <code>shard.yml</code>:</p>
<pre><code class="language-yaml">development_dependencies:
ameba:
github: crystal-ameba/ameba
version: ~&gt; 0.13.0</code></pre>
<p>Build <code>bin/ameba</code> binary within your project directory while running <code>shards install</code>.</p>
<p>You may also want to use it on <a href="travis-ci.org">Travis</a>:</p>
<pre><code class="language-yaml"># .travis.yml
language: crystal
install:
- shards install
script:
- crystal spec
- crystal bin/ameba.cr</code></pre>
<p>Using this config Ameba will inspect files just after the specs run. Travis will also fail
the build if some problems detected.</p>
<h3><a id="os-x" class="anchor" href="#os-x">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>OS X</h3>
<pre><code class="language-sh">$ brew tap veelenga/tap
$ brew install ameba</code></pre>
<h3><a id="docker" class="anchor" href="#docker">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Docker</h3>
<p>Build the image:</p>
<pre><code class="language-sh">$ docker build -t crystal-ameba/ameba .</code></pre>
<p>To use the resulting image on a local source folder, mount the current (or target) directory into <code>/src</code>:</p>
<pre><code class="language-sh">$ docker run -v $(pwd):/src crystal-ameba/ameba</code></pre>
<p>Also available on DockerHub: https://hub.docker.com/r/veelenga/ameba</p>
<h3><a id="from-sources" class="anchor" href="#from-sources">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>From sources</h3>
<pre><code class="language-sh">$ git clone https://github.com/crystal-ameba/ameba &amp;&amp; cd ameba
$ make install</code></pre>
<h2><a id="configuration" class="anchor" href="#configuration">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Configuration</h2>
<p>Default configuration file is <code>.ameba.yml</code>.
It allows to configure rule properties, disable specific rules and exclude sources from the rules.</p>
<p>Generate new file by running <code>ameba --gen-config</code>.</p>
<h3><a id="sources" class="anchor" href="#sources">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Sources</h3>
<p><strong>List of sources to run Ameba on can be configured globally via:</strong></p>
<ul>
<li><code>Globs</code> section - an array of wildcards (or paths) to include to the
inspection. Defaults to <code>%w(**/*.cr !lib)</code>, meaning it includes all project
files with <code>*.cr</code> extension except those which exist in <code>lib</code> folder.</li>
<li><code>Excluded</code> section - an array of wildcards (or paths) to exclude from the
source list defined by <code>Globs</code>. Defaults to an empty array.</li>
</ul>
<p>In this example we define default globs and exclude <code>src/compiler</code> folder:</p>
<pre><code class="language-yaml">Globs:
- **/*.cr
- !lib
Excluded:
- src/compiler</code></pre>
<p><strong>Specific sources can be excluded at rule level</strong>:</p>
<pre><code class="language-yaml">Style/RedundantBegin:
Excluded:
- src/server/processor.cr
- src/server/api.cr</code></pre>
<h3><a id="rules" class="anchor" href="#rules">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Rules</h3>
<p>One or more rules, or a one or more group of rules can be included or excluded
via command line arguments:</p>
<pre><code class="language-sh">$ ameba --only Lint/Syntax # runs only Lint/Syntax rule
$ ameba --only Style,Lint # runs only rules from Style and Lint groups
$ ameba --except Lint/Syntax # runs all rules except Lint/Syntax
$ ameba --except Style,Lint # runs all rules except rules in Style and Lint groups</code></pre>
<p>Or through the configuration file:</p>
<pre><code class="language-yaml">Style/RedundantBegin:
Enabled: false</code></pre>
<h3><a id="explain-issues" class="anchor" href="#explain-issues">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Explain issues</h3>
<p>Ameba allows you to dig deeper into an issue, by showing you details about the issue
and the reasoning by it being reported.</p>
<p>To be convenient, you can just copy-paste the <code>PATH:line:column</code> string from the
report and paste behind the <code>ameba</code> command to check it out.</p>
<pre><code class="language-sh">$ ameba crystal/command/format.cr:26:83 # show explanation for the issue
$ ameba --explain crystal/command/format.cr:26:83 # same thing</code></pre>
<h3><a id="inline-disabling" class="anchor" href="#inline-disabling">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Inline disabling</h3>
<p>One or more rules or one or more group of rules can be disabled using inline directives:</p>
<pre><code class="language-crystal"><span class="c"># ameba:disable Style/LargeNumbers</span>
time <span class="o">=</span> <span class="t">Time</span>.epoch(<span class="n">1483859302</span>)
time <span class="o">=</span> <span class="t">Time</span>.epoch(<span class="n">1483859302</span>) <span class="c"># ameba:disable Style/LargeNumbers, Lint/UselessAssign</span>
time <span class="o">=</span> <span class="t">Time</span>.epoch(<span class="n">1483859302</span>) <span class="c"># ameba:disable Style, Lint</span></code></pre>
<h2><a id="editors-integrations" class="anchor" href="#editors-integrations">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Editors &amp; integrations</h2>
<ul>
<li>Vim: <a href="https://github.com/rhysd/vim-crystal">vim-crystal</a>, <a href="https://github.com/w0rp/ale">Ale</a></li>
<li>Emacs: <a href="https://github.com/crystal-ameba/ameba.el">ameba.el</a></li>
<li>Sublime Text: <a href="https://github.com/epergo/SublimeLinter-contrib-ameba">Sublime Linter Ameba</a></li>
<li>VSCode: <a href="https://github.com/crystal-ameba/vscode-crystal-ameba">vscode-crystal-ameba</a></li>
<li>Codacy: <a href="https://github.com/codacy/codacy-ameba">codacy-ameba</a></li>
<li>GitHub Actions: <a href="https://github.com/crystal-ameba/github-action">github-action</a></li>
</ul>
<h2><a id="credits-inspirations" class="anchor" href="#credits-inspirations">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Credits &amp; inspirations</h2>
<ul>
<li><a href="https://crystal-lang.org">Crystal Language</a></li>
<li><a href="https://rubocop.readthedocs.io/en/latest/">Rubocop</a></li>
<li><a href="http://credo-ci.org/">Credo</a></li>
<li><a href="https://github.com/lpil/dogma">Dogma</a></li>
</ul>
<h2><a id="contributors" class="anchor" href="#contributors">
<svg class="octicon-link" aria-hidden="true">
<use href="#octicon-link"/>
</svg>
</a>Contributors</h2>
<ul>
<li><a href="https://github.com/veelenga">veelenga</a> Vitalii Elenhaupt - creator, maintainer</li>
</ul>
</div>
</body>
</html>
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