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367 lines
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<li id="title">
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<div class="annotation">
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<h1>optparse.coffee</h1>
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</div>
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</li>
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<li id="section-1">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-1">¶</a>
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<div class="content"><div class='highlight'><pre>{repeat} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./helpers'</span></pre></div></div>
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<li id="section-2">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-2">¶</a>
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</div>
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<p>A simple <strong>OptionParser</strong> class to parse option flags from the command-line.
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Use it like so:</p>
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<pre><code>parser = <span class="hljs-keyword">new</span> OptionParser switches, helpBanner
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options = parser.parse process.argv
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</code></pre><p>The first non-option is considered to be the start of the file (and file
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option) list, and all subsequent arguments are left unparsed.</p>
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</div>
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<div class="content"><div class='highlight'><pre>exports.OptionParser = <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">OptionParser</span></span></pre></div></div>
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</li>
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<li id="section-3">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-3">¶</a>
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</div>
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<p>Initialize with a list of valid options, in the form:</p>
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<pre><code>[short-flag, long-flag, description]
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</code></pre><p>Along with an optional banner for the usage help.</p>
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</div>
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<div class="content"><div class='highlight'><pre> constructor: <span class="hljs-function"><span class="hljs-params">(rules, @banner)</span> -></span>
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@rules = buildRules rules</pre></div></div>
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</li>
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<li id="section-4">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-4">¶</a>
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</div>
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<p>Parse the list of arguments, populating an <code>options</code> object with all of the
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specified options, and return it. Options after the first non-option
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argument are treated as arguments. <code>options.arguments</code> will be an array
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containing the remaining arguments. This is a simpler API than many option
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parsers that allow you to attach callback actions for every flag. Instead,
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you’re responsible for interpreting the options object.</p>
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</div>
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<div class="content"><div class='highlight'><pre> parse: <span class="hljs-function"><span class="hljs-params">(args)</span> -></span>
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options = arguments: []
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skippingArgument = <span class="hljs-literal">no</span>
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originalArgs = args
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args = normalizeArguments args
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<span class="hljs-keyword">for</span> arg, i <span class="hljs-keyword">in</span> args
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<span class="hljs-keyword">if</span> skippingArgument
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skippingArgument = <span class="hljs-literal">no</span>
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<span class="hljs-keyword">continue</span>
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<span class="hljs-keyword">if</span> arg <span class="hljs-keyword">is</span> <span class="hljs-string">'--'</span>
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pos = originalArgs.indexOf <span class="hljs-string">'--'</span>
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options.arguments = options.arguments.concat originalArgs[(pos + <span class="hljs-number">1</span>)..]
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<span class="hljs-keyword">break</span>
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isOption = !!(arg.match(LONG_FLAG) <span class="hljs-keyword">or</span> arg.match(SHORT_FLAG))</pre></div></div>
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</li>
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<li id="section-5">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-5">¶</a>
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</div>
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<p>the CS option parser is a little odd; options after the first
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non-option argument are treated as non-option arguments themselves</p>
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</div>
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<div class="content"><div class='highlight'><pre> seenNonOptionArg = options.arguments.length > <span class="hljs-number">0</span>
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<span class="hljs-keyword">unless</span> seenNonOptionArg
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matchedRule = <span class="hljs-literal">no</span>
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<span class="hljs-keyword">for</span> rule <span class="hljs-keyword">in</span> @rules
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<span class="hljs-keyword">if</span> rule.shortFlag <span class="hljs-keyword">is</span> arg <span class="hljs-keyword">or</span> rule.longFlag <span class="hljs-keyword">is</span> arg
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value = <span class="hljs-literal">true</span>
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<span class="hljs-keyword">if</span> rule.hasArgument
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skippingArgument = <span class="hljs-literal">yes</span>
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value = args[i + <span class="hljs-number">1</span>]
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options[rule.name] = <span class="hljs-keyword">if</span> rule.isList <span class="hljs-keyword">then</span> (options[rule.name] <span class="hljs-keyword">or</span> []).concat value <span class="hljs-keyword">else</span> value
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matchedRule = <span class="hljs-literal">yes</span>
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<span class="hljs-keyword">break</span>
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<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Error <span class="hljs-string">"unrecognized option: <span class="hljs-subst">#{arg}</span>"</span> <span class="hljs-keyword">if</span> isOption <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> matchedRule
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<span class="hljs-keyword">if</span> seenNonOptionArg <span class="hljs-keyword">or</span> <span class="hljs-keyword">not</span> isOption
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options.arguments.push arg
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options</pre></div></div>
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</li>
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<li id="section-6">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-6">¶</a>
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</div>
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<p>Return the help text for this <strong>OptionParser</strong>, listing and describing all
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of the valid options, for <code>--help</code> and such.</p>
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</div>
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<div class="content"><div class='highlight'><pre> help: <span class="hljs-function">-></span>
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lines = []
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lines.unshift <span class="hljs-string">"<span class="hljs-subst">#{@banner}</span>\n"</span> <span class="hljs-keyword">if</span> @banner
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<span class="hljs-keyword">for</span> rule <span class="hljs-keyword">in</span> @rules
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spaces = <span class="hljs-number">15</span> - rule.longFlag.length
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spaces = <span class="hljs-keyword">if</span> spaces > <span class="hljs-number">0</span> <span class="hljs-keyword">then</span> repeat <span class="hljs-string">' '</span>, spaces <span class="hljs-keyword">else</span> <span class="hljs-string">''</span>
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letPart = <span class="hljs-keyword">if</span> rule.shortFlag <span class="hljs-keyword">then</span> rule.shortFlag + <span class="hljs-string">', '</span> <span class="hljs-keyword">else</span> <span class="hljs-string">' '</span>
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lines.push <span class="hljs-string">' '</span> + letPart + rule.longFlag + spaces + rule.description
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<span class="hljs-string">"\n<span class="hljs-subst">#{ lines.join(<span class="hljs-string">'\n'</span>) }</span>\n"</span></pre></div></div>
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</li>
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<li id="section-7">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-7">¶</a>
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</div>
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<h2 id="helpers">Helpers</h2>
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</div>
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</li>
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<li id="section-8">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-8">¶</a>
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</div>
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</div>
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</li>
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<li id="section-9">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-9">¶</a>
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</div>
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<p>Regex matchers for option flags.</p>
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</div>
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<div class="content"><div class='highlight'><pre>LONG_FLAG = <span class="hljs-regexp">/^(--\w[\w\-]*)/</span>
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SHORT_FLAG = <span class="hljs-regexp">/^(-\w)$/</span>
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MULTI_FLAG = <span class="hljs-regexp">/^-(\w{2,})/</span>
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OPTIONAL = <span class="hljs-regexp">/\[(\w+(\*?))\]/</span></pre></div></div>
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</li>
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<li id="section-10">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-10">¶</a>
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</div>
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<p>Build and return the list of option rules. If the optional <em>short-flag</em> is
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unspecified, leave it out by padding with <code>null</code>.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">buildRules</span> = <span class="hljs-params">(rules)</span> -></span>
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<span class="hljs-keyword">for</span> tuple <span class="hljs-keyword">in</span> rules
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tuple.unshift <span class="hljs-literal">null</span> <span class="hljs-keyword">if</span> tuple.length < <span class="hljs-number">3</span>
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buildRule tuple...</pre></div></div>
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</li>
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<li id="section-11">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-11">¶</a>
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</div>
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<p>Build a rule from a <code>-o</code> short flag, a <code>--output [DIR]</code> long flag, and the
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description of what the option does.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">buildRule</span> = <span class="hljs-params">(shortFlag, longFlag, description, options = {})</span> -></span>
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match = longFlag.match(OPTIONAL)
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longFlag = longFlag.match(LONG_FLAG)[<span class="hljs-number">1</span>]
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{
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name: longFlag.substr <span class="hljs-number">2</span>
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shortFlag: shortFlag
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longFlag: longFlag
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description: description
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hasArgument: !!(match <span class="hljs-keyword">and</span> match[<span class="hljs-number">1</span>])
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isList: !!(match <span class="hljs-keyword">and</span> match[<span class="hljs-number">2</span>])
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}</pre></div></div>
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</li>
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<li id="section-12">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-12">¶</a>
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</div>
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<p>Normalize arguments by expanding merged flags into multiple flags. This allows
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you to have <code>-wl</code> be the same as <code>--watch --lint</code>.</p>
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</div>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">normalizeArguments</span> = <span class="hljs-params">(args)</span> -></span>
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args = args[..]
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result = []
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<span class="hljs-keyword">for</span> arg <span class="hljs-keyword">in</span> args
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<span class="hljs-keyword">if</span> match = arg.match MULTI_FLAG
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result.push <span class="hljs-string">'-'</span> + l <span class="hljs-keyword">for</span> l <span class="hljs-keyword">in</span> match[<span class="hljs-number">1</span>].split <span class="hljs-string">''</span>
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<span class="hljs-keyword">else</span>
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result.push arg
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result</pre></div></div>
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