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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>Resource Finder</title>
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<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<meta name="viewport" content="width=device-width initial-scale=1">
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<script>
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function togglePopup(material_id) {
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var popup = document.getElementById(material_id);
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popup.classList.toggle("show");
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}
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</script>
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<link href="../docs-assets/Popups.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<h1><a href="../index.html">
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<img src="../docs-assets/Inform.png" height=72">
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</a></h1>
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<ul><li><a href="../index.html">home</a></li>
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</ul><h2>Compiler</h2><ul>
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<li><a href="../structure.html">structure</a></li>
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<li><a href="../inbuildn.html">inbuild</a></li>
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<li><a href="../inform7n.html">inform7</a></li>
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<li><a href="../intern.html">inter</a></li>
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<li><a href="../services.html">services</a></li>
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<li><a href="../secrets.html">secrets</a></li>
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</ul><h2>Other Tools</h2><ul>
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<li><a href="../inblorbn.html">inblorb</a></li>
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<li><a href="../indocn.html">indoc</a></li>
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<li><a href="../inform6.html">inform6</a></li>
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<li><a href="../inpolicyn.html">inpolicy</a></li>
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</ul><h2>Resources</h2><ul>
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<li><a href="../extensions.html">extensions</a></li>
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<li><a href="../kits.html">kits</a></li>
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</ul><h2>Repository</h2><ul>
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<li><a href="https://github.com/ganelson/inform"><img src="../docs-assets/github.png" height=18> github</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inweb/index.html">inweb</a></li>
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<li><a href="../../../intest/index.html">intest</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of 'Resource Finder' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">multimedia</a></li><li><a href="index.html#2">Chapter 2: Multimedia Features</a></li><li><b>Resource Finder</b></li></ul></div>
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<p class="purpose">To find resources such as sound and image files.</p>
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<ul class="toc"><li><a href="2-rf.html#SP1">§1. Resource finder</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Resource finder. </b>This simple function is shared by the code for figures, sound effects and
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internal data files. When Inform reads a sentence such as:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">Sound</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">Organ</span><span class="plain-syntax"> </span><span class="identifier-syntax">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">file</span><span class="plain-syntax"> </span><span class="string-syntax">"Passacaglia.aiff"</span><span class="plain-syntax">.</span>
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</pre>
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<p class="commentary">it needs to find this file, which will either be in the materials for the
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project, or in materials for the extension in which this sentence occurs
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(if it occurs in an extension). In either case, it'll be in the <span class="extract"><span class="extract-syntax">Sounds</span></span>
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subdirectory. Here <span class="extract"><span class="extract-syntax">"Sounds"</span></span> is what we will call the department name for
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sound effects.
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</p>
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<p class="commentary">This code was introduced as part of the implementation of IE-0001, and for
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the first time throws problem messages if named resources do not exist.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">check_resources_are_present</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ResourceFinder::set_mode</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">check_resources_are_present</span><span class="plain-syntax"> = </span><span class="identifier-syntax">val</span><span class="plain-syntax">; </span><span class="comment-syntax"> set by </span><span class="extract"><span class="extract-syntax">-resource-checking</span></span><span class="comment-syntax"> at command line</span>
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<span class="plain-syntax">}</span>
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<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">ResourceFinder::find_resource</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">ResourceFinder::find_resource</span></span>:<br/>Figures - <a href="2-fgr.html#SP5">§5</a><br/>Sound Effects - <a href="2-se.html#SP5">§5</a><br/>Internal Files - <a href="2-if.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">department</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">leaf</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::nonempty</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Extensions::corresponding_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">Lexer::file_of_origin</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">materials_dept</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Pathnames::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::resources_path</span><span class="plain-syntax">(), </span><span class="identifier-syntax">department</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">extension_dept</span><span class="plain-syntax"> = </span><span class="identifier-syntax">E</span><span class="plain-syntax">?(</span><span class="identifier-syntax">Pathnames::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">Extensions::materials_path</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">), </span><span class="identifier-syntax">department</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">extension_dept</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-rf.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Look for an extension resource</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">materials_dept</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-rf.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Look for a regular materials resource</span><span class="named-paragraph-number">1.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_wording</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">department</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">Untestable</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"You wrote %1, which means I am looking for a file called %2, but I'm "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"unable to find it. "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">extension_dept</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"The file should either be in the '%3' subfolder of the materials folder, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"or in the 'Materials/%3' subfolder of this extension."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"The file should be in the '%3' subfolder of the materials folder."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b>So here we're reading the line from an extension, say <span class="extract"><span class="extract-syntax">Leipzig Organ Recitals</span></span>.
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We first look for an audio file called something like
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<span class="extract"><span class="extract-syntax">Leipzig Organ Recitals-v1/Materials/Sounds/Passacaglia.aiff</span></span>. If that exists, then we
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know this is a resource which the extension provides; but we still give the
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project a chance to override that with a file
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<span class="extract"><span class="extract-syntax">Project.materials/Sounds/Leipzig Organ Recitals/Passacaglia.aiff</span></span>,
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which would be used in preference.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Look for an extension resource</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="2-rf.html#SP2" class="function-link"><span class="function-syntax">ResourceFinder::if_present</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">extension_dept</span><span class="plain-syntax">, </span><span class="identifier-syntax">leaf</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">materials_override</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Pathnames::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">materials_dept</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</span><span class="plain-syntax">-></span><span class="identifier-syntax">as_copy</span><span class="plain-syntax">-></span><span class="identifier-syntax">edition</span><span class="plain-syntax">-></span><span class="identifier-syntax">work</span><span class="plain-syntax">-></span><span class="identifier-syntax">title</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OF</span><span class="plain-syntax"> = </span><a href="2-rf.html#SP2" class="function-link"><span class="function-syntax">ResourceFinder::if_present</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">materials_override</span><span class="plain-syntax">, </span><span class="identifier-syntax">leaf</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">OF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">OF</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-rf.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_2" class="paragraph-anchor"></a><b>§1.2. </b>Otherwise the resource is not provided by the extension in which the sentence
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occurs, or else, the sentence does not occur in an extension. (Of course, this is
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by far the most likely thing.) Here we just look in the project's materials folder,
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so for example <span class="extract"><span class="extract-syntax">Project.materials/Sounds/Passacaglia.aiff</span></span>.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Look for a regular materials resource</span><span class="named-paragraph-number">1.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">materials_dept</span><span class="plain-syntax">, </span><span class="identifier-syntax">leaf</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">check_resources_are_present</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="2-rf.html#SP2" class="function-link"><span class="function-syntax">ResourceFinder::if_present</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-rf.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>This checks the existence of such a file on disc. We're not going to fret
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over the possibility of accidentally opening a directory here.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">ResourceFinder::if_present</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">ResourceFinder::if_present</span></span>:<br/><a href="2-rf.html#SP1_1">§1.1</a>, <a href="2-rf.html#SP1_2">§1.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::fopen</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="string-syntax">"rb"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">fclose</span><span class="plain-syntax">(</span><span class="identifier-syntax">handle</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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