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<span class="hidden">CLiki - unix-opts</span>
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<div id="content"><div id="content-area"><div id="article-title">unix-opts</div><div id="article">This is a minimalistic parser of command line options. Main advantage of
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this library is ability to concisely define command line options once
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and then use this definition for parsing and extraction of command line
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arguments, as well as printing description of command line options (you
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get <code>--help</code> for free). This way you don't need to repeat yourself. Also,
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<a href="unix-opts.html" class="internal">unix-opts</a> doesn't depend on anything and allows to precisely control
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behavior of the parser via Common Lisp restarts.<p>GitHub repository: <a href="https://github.com/libre-man/unix-opts">https://github.com/libre-man/unix-opts</a><p>You can install it via Quicklisp:<p><div class="code"><span class="nonparen"><span class="paren1">(<span class="nonparen">ql:quickload <span class="string">"unix-opts"</span></span>)</span>
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</span></div><p>Here is an example how to define some command line options with
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<a href="unix-opts.html" class="internal">unix-opts</a>:<p><div class="code"><span class="nonparen"><span class="paren1">(<span class="nonparen"><i><span class="symbol">opts:define-opts</span></i>
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<span class="paren2">(<span class="nonparen"><span class="keyword">:name</span> <span class="keyword">:output</span>
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<span class="keyword">:description</span> <span class="string">"redirect output to file FILE"</span>
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<span class="keyword">:short</span> <span class="character">#\o</span>
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<span class="keyword">:long</span> <span class="string">"output"</span>
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<span class="keyword">:arg-parser</span> #'<a href="https://www.cliki.net/site/HyperSpec/Body/fun_identity.html" class="symbol">identity</a>
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<span class="keyword">:meta-var</span> <span class="string">"FILE"</span></span>)</span>
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<span class="paren2">(<span class="nonparen"><span class="keyword">:name</span> <span class="keyword">:level</span>
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<span class="keyword">:description</span> <span class="string">"the program will run on LEVEL level"</span>
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<span class="keyword">:short</span> <span class="character">#\l</span>
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<span class="keyword">:long</span> <span class="string">"level"</span>
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<span class="keyword">:arg-parser</span> #'<a href="https://www.cliki.net/site/HyperSpec/Body/fun_parse-integer.html" class="symbol">parse-integer</a>
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<span class="keyword">:meta-var</span> <span class="string">"LEVEL"</span></span>)</span>
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<span class="paren2">(<span class="nonparen"><span class="keyword">:name</span> <span class="keyword">:verbose</span>
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<span class="keyword">:description</span> <span class="string">"verbose output"</span>
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<span class="keyword">:short</span> <span class="character">#\v</span>
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<span class="keyword">:long</span> <span class="string">"verbose"</span></span>)</span>
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<span class="paren2">(<span class="nonparen"><span class="keyword">:name</span> <span class="keyword">:help</span>
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<span class="keyword">:description</span> <span class="string">"print this help text"</span>
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<span class="keyword">:short</span> <span class="character">#\h</span>
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<span class="keyword">:long</span> <span class="string">"help"</span></span>)</span></span>)</span></span></div><p>See it in action (<a href="https://github.com/libre-man/unix-opts/blob/master/example/example.lisp">full
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source code of the example</a>):<p><pre>$ sh example.sh --help
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example - program to demonstrate unix-opts library
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Available options:
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-h, --help print this help text
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-v, --verbose verbose output
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-l, --level LEVEL the program will run on LEVEL level
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-o, --output FILE redirect output to file FILE
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so that's how it works...
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free args:
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$ sh example.sh -v file1.txt file2.txt
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OK, running in verbose mode...
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free args: file1.txt, file2.txt
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$ sh example.sh --level 10 --output foo.txt bar.txt
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I see you've supplied level option, you want 10 level!
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I see you want to output the stuff to "foo.txt"!
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free args: bar.txt
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$ sh example.sh --level kitty foo.txt
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fatal: cannot parse "kitty" as argument of "--level"
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free args:
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$ sh example.sh --hoola-boola noola.txt
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warning: "--hoola-boola" option is unknown!
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free args: noola.txt
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$ sh example.sh -vgl=10
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warning: "-g" option is unknown!
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OK, running in verbose mode...
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I see you've supplied level option, you want 10 level!
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free args:
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</pre><p><a href="unix-opts.html" class="internal">unix-opts</a> was written by <a href="Mark Karpov.html" class="internal">Mark Karpov</a> and is maintained by libre-man.<p>It's distributed under <a href="MIT-license.html" class="internal">MIT-license</a>.<p><hr><p>Relevant topics: <a href="library.html" class="category">library</a>, <a href="console.html" class="category">console</a>, <a href="system programming.html" class="category">system programming</a>
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<a href="command-line options parser.html" class="category">command-line options parser</a></div></div>
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