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<h1>Penlight</h1>
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<li><a href="https://github.com/lunarmodules/Penlight">GitHub Project</a></li>
<li><a href="../index.html">Documentation</a></li>
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<h2>Examples</h2>
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<li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
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<li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li>
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<li><strong>which.lua</strong></li>
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<h2>which.lua</h2>
<pre>
<span class="comment">-- a simple implementation of the which command. This looks for
</span><span class="comment">-- the given file on the path. On windows, it will assume an extension
</span><span class="comment">-- of .exe if no extension is given.
</span><span class="keyword">local</span> List = <span class="global">require</span> <span class="string">'pl.List'</span>
<span class="keyword">local</span> path = <span class="global">require</span> <span class="string">'pl.path'</span>
<span class="keyword">local</span> app = <span class="global">require</span> <span class="string">'pl.app'</span>
<span class="keyword">local</span> pathl = List.<span class="function-name">split</span>(<span class="global">os</span>.<span class="function-name">getenv</span> <span class="string">'PATH'</span>,path.dirsep)
<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">which</span> (file)
<span class="keyword">local</span> res = pathl:<span class="function-name">map</span>(path.join,file)
res = res:<span class="function-name">filter</span>(path.exists)
<span class="keyword">if</span> res <span class="keyword">then</span> <span class="keyword">return</span> res[<span class="number">1</span>] <span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">local</span> _,lua = app.<span class="function-name">lua</span>()
<span class="keyword">local</span> file = arg[<span class="number">1</span>] <span class="keyword">or</span> lua <span class="comment">-- i.e. location of lua executable
</span><span class="keyword">local</span> try
<span class="keyword">if</span> <span class="keyword">not</span> file <span class="keyword">then</span> <span class="keyword">return</span> <span class="global">print</span> <span class="string">'must provide a filename'</span> <span class="keyword">end</span>
<span class="keyword">if</span> path.<span class="function-name">extension</span>(file) == <span class="string">''</span> <span class="keyword">and</span> path.is_windows <span class="keyword">then</span>
try = <span class="function-name">which</span>(file..<span class="string">'.exe'</span>)
<span class="keyword">else</span>
try = <span class="function-name">which</span>(file)
<span class="keyword">end</span>
<span class="keyword">if</span> try <span class="keyword">then</span> <span class="global">print</span>(try) <span class="keyword">else</span> <span class="global">print</span> <span class="string">'cannot find on path'</span> <span class="keyword">end</span></pre>
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