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<ul><li><a href="../compiler.html">compiler tools</a></li>
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<main role="main">
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<!--Weave of 'The Options File' 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="../compiler.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#6">Chapter 6: Inform Source Text</a></li><li><b>The Options File</b></li></ul></div>
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<p class="purpose">The optional file of Options applied to all of the user's projects.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>An Inform user with unyielding views on punctuation may want to have:
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</p>
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<blockquote>
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<p>Use the serial comma.</p>
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</blockquote>
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<p class="commentary">applied to every project she works on. For such needs, it's possible to
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create an <span class="extract"><span class="extract-syntax">Options.txt</span></span> file of sentence which are present, by implication,
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in every project.
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</p>
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<p class="commentary">When Inform reads this file, very early in its run, it tries to obey any use
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options in the file right away — earlier even than <structural-sentence>. It
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spots these, very crudely, as sentences which match the following (that is,
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which start with "use"). Note the final full stop — this is all occurring
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before sentence-breaking has even taken place. Fortunately, no matter how
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unyielding the user's views, it's not allowed to write:
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</p>
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<blockquote>
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<p>Use the serial comma!</p>
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</blockquote>
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<p class="commentary">so the sentence-terminator will certainly be a full stop.
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</p>
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<pre class="Preform-displayed-code all-displayed-code code-font">
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<span class="Preform-function-syntax"><use-option-sentence-shape></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">use</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use></span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">.</span>
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<span class="Preform-function-syntax"><immediate-use></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">...</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> { lookahead }</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use-tail></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use-entry></span>
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<span class="Preform-function-syntax"><immediate-use-tail></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">,</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">_and</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">_,/and</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><immediate-use></span>
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<span class="Preform-function-syntax"><immediate-use-entry></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax"><notable-use-option-name></span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==></span><span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-tof.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Act on this use option immediately</span><span class="named-paragraph-number">1.1</span></a></span>
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<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">......</span>
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</pre>
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<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Act on this use option immediately</span><span class="named-paragraph-number">1.1</span></span><span class="Preform-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">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CompilationSettings::set</span><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">[1], -1, </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">endif</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-tof.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>There is just one options file, so no need to load it more than once.
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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">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">options_file_wording</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EMPTY_WORDING_INIT</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">OptionsFile::read</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">OptionsFile::read</span></span>:<br/>Project Services - <a href="5-ps2.html#SP29_1">§29.1</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Wordings::empty</span><span class="plain-syntax">(</span><span class="identifier-syntax">options_file_wording</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">feed_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">id</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Feeds::begin</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TextFiles::read</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><a href="6-tof.html#SP2" class="function-link"><span class="function-syntax">OptionsFile::read_helper</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">options_file_wording</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Feeds::end</span><span class="plain-syntax">(</span><span class="identifier-syntax">id</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">OptionsFile::read_helper</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">line</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_file_position</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tfp</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">unused_state</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
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<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><span class="identifier-syntax">Feeds::feed_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="function-syntax"><use-option-sentence-shape></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>
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