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