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<title>How To Include This Module</title>
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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="../services.html">services</a></li>
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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="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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<!--Weave of 'How To Include This Module' 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="../services.html">Services</a></li><li><a href="index.html">problems</a></li><li><a href="index.html#P">Preliminaries</a></li><li><b>How To Include This Module</b></li></ul></div>
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<p class="purpose">What to do to make use of the problems module in a new command-line tool.</p>
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<ul class="toc"><li><a href="P-htitm.html#SP1">§1. Status</a></li><li><a href="P-htitm.html#SP2">§2. Importing the module</a></li><li><a href="P-htitm.html#SP3">§3. Using callbacks</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Status. </b>The problems module provided as one of the "services" suite of modules, which means
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that it was built with a view to potential incorporation in multiple tools.
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It can be found, for example, in <a href="../inform7/index.html" class="internal">inform7</a> and <a href="../problems-test/index.html" class="internal">problems-test</a>.
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</p>
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<p class="commentary">By convention, the modules considered as "services" have no dependencies on
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other modules except for <a href="../../../inweb/foundation-module/index.html" class="internal">foundation</a> and other "services" modules.
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</p>
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<p class="commentary">A tool can import <a href="index.html" class="internal">problems</a> only if it also imports <a href="../../../inweb/foundation-module/index.html" class="internal">foundation</a>,
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<a href="../words-module/index.html" class="internal">words</a> and <a href="../syntax-module/index.html" class="internal">syntax</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Importing the module. </b>We'll use the term "parent" to mean the tool which is importing <a href="index.html" class="internal">problems</a>,
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that is, which will include its code and be able to use it. As with any
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imported module,
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</p>
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<ul class="items"><li>● The contents page of the parent's web must identify and locate the
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module:
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</li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="element-syntax">Import</span><span class="plain-syntax">:</span><span class="string-syntax"> somepath/problems</span>
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</pre>
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<ul class="items"><li>● The parent must call <span class="extract"><span class="extract-syntax">ProblemsModule::start()</span></span> just after it starts up, and
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<span class="extract"><span class="extract-syntax">ProblemsModule::end()</span></span> just before it shuts down. (But just after, and just
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before, the corresponding calls to <a href="../../../inweb/foundation-module/index.html" class="internal">foundation</a>.)
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Using callbacks. </b>Shared modules like this one are tweaked in behaviour by defining "callback
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functions". This means that the parent might provide a function of its own
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which would answer a question put to it by the module, or take some action
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on behalf of the module: it's a callback in the sense that the parent is
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normally calling the module, but then the module calls the parent back to
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ask for data or action.
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</p>
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<p class="commentary">The problems module has only a few callbacks, and they are all optional. The
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following alphabetical list has references to fuller explanations:
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b><span class="extract"><span class="extract-syntax">DESCRIBE_SOURCE_FILE_PROBLEMS_CALLBACK</span></span> can change the description of a
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file used in problem messages; Inform uses this to say "the source text" or
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"Standard Rules" rather than citing filenames. See <a href="2-pl1.html#SP4" class="internal">ProblemBuffer::copy_source_reference</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b><span class="extract"><span class="extract-syntax">DOCUMENTATION_REFERENCE_PROBLEMS_CALLBACK</span></span> is invited to add a clickable
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link to in-app documentation; if no callback function is provided, no
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such links appear. See <a href="2-pl2.html#SP10" class="internal">Problems::problem_documentation_links</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b><span class="extract"><span class="extract-syntax">ENDING_MESSAGE_PROBLEMS_CALLBACK</span></span> is called just before a problem message
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is about to end, and can be used to append some extra wording. See
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<a href="2-pl2.html#SP9" class="internal">Problems::issue_problem_end</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b><span class="extract"><span class="extract-syntax">FIRST_PROBLEMS_CALLBACK</span></span> is called before the first problem in a run is
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issued, and takes as an argument the <span class="extract"><span class="extract-syntax">text_stream *</span></span> to which problems are
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being written. See <a href="2-pl2.html#SP3" class="internal">Problems::show_problem_location</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b><span class="extract"><span class="extract-syntax">FORMAT_CONSOLE_PROBLEMS_CALLBACK</span></span> is called when a Problem message is to
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be printed to the <span class="extract"><span class="extract-syntax">stderr</span></span> console (it has no effect on the rendering of Problems
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in HTML). See <a href="2-pl1.html#SP5" class="internal">ProblemBuffer::output_problem_buffer_to</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b><span class="extract"><span class="extract-syntax">GLOSS_EXTENSION_SOURCE_FILE_PROBLEMS_CALLBACK</span></span> is called to add a note
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like "in the extension Locksmith by Emily Short"; see <a href="2-pl2.html#SP3" class="internal">Problems::show_problem_location</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b><span class="extract"><span class="extract-syntax">INFORMATIONAL_ADDENDA_PROBLEMS_CALLBACK</span></span> is called just before a problems
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report closes, to give it a chance to add informational messages. (<a href="../core-module/index.html" class="internal">core</a>
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uses this mechanism to append text such as "There were 3 rooms and 27 things.")
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Such addenda are not problems, and do not affect the program's exit code.
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See <a href="2-pl1.html#SP7" class="internal">ProblemBuffer::write_reports</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b><span class="extract"><span class="extract-syntax">START_PROBLEM_FILE_PROBLEMS_CALLBACK</span></span> is called when <a href="index.html" class="internal">problems</a> wants
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to open some kind of file for problem messages, with two arguments: the
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filename <span class="extract"><span class="extract-syntax">F</span></span> and the stream <span class="extract"><span class="extract-syntax">P</span></span> to open to it. If the callback function wants
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this to come to anything, it must perform the file-open, and write any header
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material it would like. See <a href="2-pl3.html#SP19" class="internal">StandardProblems::start_problems_report</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b><span class="extract"><span class="extract-syntax">END_PROBLEM_FILE_PROBLEMS_CALLBACK</span></span> is called when <a href="index.html" class="internal">problems</a> wants
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to close this file again. See <a href="2-pl1.html#SP7" class="internal">ProblemBuffer::write_reports</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. </b><span class="extract"><span class="extract-syntax">WORDING_FOR_HEADING_NODE_PROBLEMS_CALLBACK</span></span> is called to ask what wording
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should be used to describe a heading in problem messages. See
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<a href="2-pl2.html#SP3" class="internal">Problems::show_problem_location</a>.
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</p>
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<ul class="progressbar"><li class="progressprev"><a href="P-wtmd.html">❮</a></li><li class="progresscurrentchapter">P</li><li class="progresssection"><a href="P-wtmd.html">wtmd</a></li><li class="progresscurrent">htitm</li><li class="progresschapter"><a href="1-pm.html">1</a></li><li class="progresschapter"><a href="2-pl0.html">2</a></li><li class="progressnext"><a href="1-pm.html">❯</a></li></ul></div>
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