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17dfb51fb19ae1a419a232a2ca72bad1bf48259e.svn-base 15.5 KB
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<!DOCTYPE html>  <html> <head>   <title>pkginfo.js</title>   <meta http-equiv="content-type" content="text/html; charset=UTF-8">   <link rel="stylesheet" media="all" href="docco.css" /> </head> <body>   <div id="container">     <div id="background"></div>          <table cellpadding="0" cellspacing="0">       <thead>         <tr>           <th class="docs">             <h1>               pkginfo.js             </h1>           </th>           <th class="code">           </th>         </tr>       </thead>       <tbody>                               <tr id="section-1">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-1">&#182;</a>               </div>                            </td>             <td class="code">               <div class="highlight"><pre><span class="cm">/*</span>
<span class="cm"> * pkginfo.js: Top-level include for the pkginfo module</span>
<span class="cm"> *</span>
<span class="cm"> * (C) 2011, Charlie Robbins</span>
<span class="cm"> *</span>
<span class="cm"> */</span>
 
<span class="kd">var</span> <span class="nx">fs</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;fs&#39;</span><span class="p">),</span>
    <span class="nx">path</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;path&#39;</span><span class="p">);</span></pre></div>             </td>           </tr>                               <tr id="section-2">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-2">&#182;</a>               </div>               <h3>function pkginfo ([options, 'property', 'property' ..])</h3>

<h4>@pmodule {Module} Parent module to read from.</h4>

<h4>@options {Object|Array|string} <strong>Optional</strong> Options used when exposing properties.</h4>

<h4>@arguments {string...} <strong>Optional</strong> Specified properties to expose.</h4>

<p>Exposes properties from the package.json file for the parent module on 
it's exports. Valid usage:</p>

<p><code>require('pkginfo')()</code></p>

<p><code>require('pkginfo')('version', 'author');</code></p>

<p><code>require('pkginfo')(['version', 'author']);</code></p>

<p><code>require('pkginfo')({ include: ['version', 'author'] });</code></p>             </td>             <td class="code">               <div class="highlight"><pre><span class="kd">var</span> <span class="nx">pkginfo</span> <span class="o">=</span> <span class="nx">module</span><span class="p">.</span><span class="nx">exports</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">pmodule</span><span class="p">,</span> <span class="nx">options</span><span class="p">)</span> <span class="p">{</span>
  <span class="kd">var</span> <span class="nx">args</span> <span class="o">=</span> <span class="p">[].</span><span class="nx">slice</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="nx">arguments</span><span class="p">,</span> <span class="mi">2</span><span class="p">).</span><span class="nx">filter</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">arg</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">return</span> <span class="k">typeof</span> <span class="nx">arg</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="p">;</span>
  <span class="p">});</span>
  </pre></div>             </td>           </tr>                               <tr id="section-3">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-3">&#182;</a>               </div>               <p><strong>Parse variable arguments</strong></p>             </td>             <td class="code">               <div class="highlight"><pre>  <span class="k">if</span> <span class="p">(</span><span class="nb">Array</span><span class="p">.</span><span class="nx">isArray</span><span class="p">(</span><span class="nx">options</span><span class="p">))</span> <span class="p">{</span></pre></div>             </td>           </tr>                               <tr id="section-4">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-4">&#182;</a>               </div>               <p>If the options passed in is an Array assume that
it is the Array of properties to expose from the
on the package.json file on the parent module.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="nx">options</span> <span class="o">=</span> <span class="p">{</span> <span class="nx">include</span><span class="o">:</span> <span class="nx">options</span> <span class="p">};</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="k">typeof</span> <span class="nx">options</span> <span class="o">===</span> <span class="s1">&#39;string&#39;</span><span class="p">)</span> <span class="p">{</span></pre></div>             </td>           </tr>                               <tr id="section-5">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-5">&#182;</a>               </div>               <p>Otherwise if the first argument is a string, then
assume that it is the first property to expose from
the package.json file on the parent module.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="nx">options</span> <span class="o">=</span> <span class="p">{</span> <span class="nx">include</span><span class="o">:</span> <span class="p">[</span><span class="nx">options</span><span class="p">]</span> <span class="p">};</span>
  <span class="p">}</span>
  </pre></div>             </td>           </tr>                               <tr id="section-6">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-6">&#182;</a>               </div>               <p><strong>Setup default options</strong></p>             </td>             <td class="code">               <div class="highlight"><pre>  <span class="nx">options</span> <span class="o">=</span> <span class="nx">options</span> <span class="o">||</span> <span class="p">{</span> <span class="nx">include</span><span class="o">:</span> <span class="p">[]</span> <span class="p">};</span>
  
  <span class="k">if</span> <span class="p">(</span><span class="nx">args</span><span class="p">.</span><span class="nx">length</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></div>             </td>           </tr>                               <tr id="section-7">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-7">&#182;</a>               </div>               <p>If additional string arguments have been passed in
then add them to the properties to expose on the 
parent module. </p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="nx">options</span><span class="p">.</span><span class="nx">include</span> <span class="o">=</span> <span class="nx">options</span><span class="p">.</span><span class="nx">include</span><span class="p">.</span><span class="nx">concat</span><span class="p">(</span><span class="nx">args</span><span class="p">);</span>
  <span class="p">}</span>
  
  <span class="kd">var</span> <span class="nx">pkg</span> <span class="o">=</span> <span class="nx">pkginfo</span><span class="p">.</span><span class="nx">read</span><span class="p">(</span><span class="nx">pmodule</span><span class="p">,</span> <span class="nx">options</span><span class="p">.</span><span class="nx">dir</span><span class="p">).</span><span class="kr">package</span><span class="p">;</span>
  <span class="nb">Object</span><span class="p">.</span><span class="nx">keys</span><span class="p">(</span><span class="nx">pkg</span><span class="p">).</span><span class="nx">forEach</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">key</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="nx">options</span><span class="p">.</span><span class="nx">include</span><span class="p">.</span><span class="nx">length</span> <span class="o">&gt;</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span> <span class="o">!~</span><span class="nx">options</span><span class="p">.</span><span class="nx">include</span><span class="p">.</span><span class="nx">indexOf</span><span class="p">(</span><span class="nx">key</span><span class="p">))</span> <span class="p">{</span>
      <span class="k">return</span><span class="p">;</span>
    <span class="p">}</span>
    
    <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">pmodule</span><span class="p">.</span><span class="nx">exports</span><span class="p">[</span><span class="nx">key</span><span class="p">])</span> <span class="p">{</span>
      <span class="nx">pmodule</span><span class="p">.</span><span class="nx">exports</span><span class="p">[</span><span class="nx">key</span><span class="p">]</span> <span class="o">=</span> <span class="nx">pkg</span><span class="p">[</span><span class="nx">key</span><span class="p">];</span>
    <span class="p">}</span>
  <span class="p">});</span>
  
  <span class="k">return</span> <span class="nx">pkginfo</span><span class="p">;</span>
<span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-8">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-8">&#182;</a>               </div>               <h3>function find (dir)</h3>

<h4>@pmodule {Module} Parent module to read from.</h4>

<h4>@dir {string} <strong>Optional</strong> Directory to start search from.</h4>

<p>Searches up the directory tree from <code>dir</code> until it finds a directory
which contains a <code>package.json</code> file. </p>             </td>             <td class="code">               <div class="highlight"><pre><span class="nx">pkginfo</span><span class="p">.</span><span class="nx">find</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">pmodule</span><span class="p">,</span> <span class="nx">dir</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">dir</span> <span class="o">=</span> <span class="nx">dir</span> <span class="o">||</span> <span class="nx">pmodule</span><span class="p">.</span><span class="nx">filename</span><span class="p">;</span>
  <span class="nx">dir</span> <span class="o">=</span> <span class="nx">path</span><span class="p">.</span><span class="nx">dirname</span><span class="p">(</span><span class="nx">dir</span><span class="p">);</span> 
  
  <span class="kd">var</span> <span class="nx">files</span> <span class="o">=</span> <span class="nx">fs</span><span class="p">.</span><span class="nx">readdirSync</span><span class="p">(</span><span class="nx">dir</span><span class="p">);</span>
  
  <span class="k">if</span> <span class="p">(</span><span class="o">~</span><span class="nx">files</span><span class="p">.</span><span class="nx">indexOf</span><span class="p">(</span><span class="s1">&#39;package.json&#39;</span><span class="p">))</span> <span class="p">{</span>
    <span class="k">return</span> <span class="nx">path</span><span class="p">.</span><span class="nx">join</span><span class="p">(</span><span class="nx">dir</span><span class="p">,</span> <span class="s1">&#39;package.json&#39;</span><span class="p">);</span>
  <span class="p">}</span>
  
  <span class="k">if</span> <span class="p">(</span><span class="nx">dir</span> <span class="o">===</span> <span class="s1">&#39;/&#39;</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">throw</span> <span class="k">new</span> <span class="nb">Error</span><span class="p">(</span><span class="s1">&#39;Could not find package.json up from: &#39;</span> <span class="o">+</span> <span class="nx">dir</span><span class="p">);</span>
  <span class="p">}</span>
  
  <span class="k">return</span> <span class="nx">pkginfo</span><span class="p">.</span><span class="nx">find</span><span class="p">(</span><span class="nx">dir</span><span class="p">);</span>
<span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-9">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-9">&#182;</a>               </div>               <h3>function read (pmodule, dir)</h3>

<h4>@pmodule {Module} Parent module to read from.</h4>

<h4>@dir {string} <strong>Optional</strong> Directory to start search from.</h4>

<p>Searches up the directory tree from <code>dir</code> until it finds a directory
which contains a <code>package.json</code> file and returns the package information.</p>             </td>             <td class="code">               <div class="highlight"><pre><span class="nx">pkginfo</span><span class="p">.</span><span class="nx">read</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">pmodule</span><span class="p">,</span> <span class="nx">dir</span><span class="p">)</span> <span class="p">{</span> 
  <span class="nx">dir</span> <span class="o">=</span> <span class="nx">pkginfo</span><span class="p">.</span><span class="nx">find</span><span class="p">(</span><span class="nx">pmodule</span><span class="p">,</span> <span class="nx">dir</span><span class="p">);</span>
  
  <span class="kd">var</span> <span class="nx">data</span> <span class="o">=</span> <span class="nx">fs</span><span class="p">.</span><span class="nx">readFileSync</span><span class="p">(</span><span class="nx">dir</span><span class="p">).</span><span class="nx">toString</span><span class="p">();</span>
      
  <span class="k">return</span> <span class="p">{</span>
    <span class="nx">dir</span><span class="o">:</span> <span class="nx">dir</span><span class="p">,</span> 
    <span class="kr">package</span><span class="o">:</span> <span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">data</span><span class="p">)</span>
  <span class="p">};</span>
<span class="p">};</span></pre></div>             </td>           </tr>                               <tr id="section-10">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-10">&#182;</a>               </div>               <p>Call <code>pkginfo</code> on this module and expose version.</p>             </td>             <td class="code">               <div class="highlight"><pre><span class="nx">pkginfo</span><span class="p">(</span><span class="nx">module</span><span class="p">,</span> <span class="p">{</span>
  <span class="nx">dir</span><span class="o">:</span> <span class="nx">__dirname</span><span class="p">,</span>
  <span class="nx">include</span><span class="o">:</span> <span class="p">[</span><span class="s1">&#39;version&#39;</span><span class="p">],</span>
  <span class="nx">target</span><span class="o">:</span> <span class="nx">pkginfo</span>
<span class="p">});</span>

</pre></div>             </td>           </tr>                </tbody>     </table>   </div> </body> </html>