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<h1 class="page-title">Configuration Files</h1>
<h2 id="general-information">General Information</h2>
<p>ENiGMA½ configuration files such as the <a href="/enigma-bbs/configuration/config-hjson.html">system config</a>, <a href="/enigma-bbs/configuration/menu-hjson.html">menus</a> and <a href="/enigma-bbs/art/themes.html">themes</a> are formatted in the <a href="/enigma-bbs/configuration/hjson.html">HJSON format</a>.</p>
<h2 id="hot-reload">Hot-Reload</h2>
<p>Nearly all of ENiGMA½’s configuration can be hot-reloaded. That is, a live system can have it’s configuration modified and it will be loaded in place.</p>
<blockquote>
<p><img class="emoji" title=":bulb:" alt=":bulb:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f4a1.png" height="20" width="20"> <a href="/enigma-bbs/troubleshooting/monitoring-logs.html">Monitoring live logs</a> is useful when making live changes. The system will complain if something is wrong!</p>
</blockquote>
<h2 id="common-directives">Common Directives</h2>
<h3 id="includes">Includes</h3>
<p>Most configuration files offer an <code class="language-plaintext highlighter-rouge">includes</code> directive that allows users to break up large configuration files into smaller and organized parts. For example, consider a system with many menus/screens. Instead of a single <code class="language-plaintext highlighter-rouge">menu.hjson</code>, the SysOp may break this into <code class="language-plaintext highlighter-rouge">message-base.hjson</code>, <code class="language-plaintext highlighter-rouge">file-base.hjson</code>, etc.</p>
<p>The <code class="language-plaintext highlighter-rouge">includes</code> directive may be used the top-level scope of a configuration file:</p>
<pre><code class="language-hjson">// menu.hjson
{
includes: [
message-base.hjson
file-base.hjson
]
menus: {
someOtherMenu: {
// ...
}
}
}
</code></pre>
<pre><code class="language-hjson">// message-base.hjson
{
menus: {
someMessageMenu: {
// ...
}
}
}
</code></pre>
<h3 id="references">References</h3>
<p>Often times in a configuration you will find that you’re repeating yourself quite a bit. ENiGMA½ provides an <code class="language-plaintext highlighter-rouge">@reference</code> that can help with this in the form of <code class="language-plaintext highlighter-rouge">@reference:dot.path.to.section</code>.</p>
<p>Consider <code class="language-plaintext highlighter-rouge">actionKeys</code> in a menu. Often times you may show a screen and the user presses <code class="language-plaintext highlighter-rouge">Q</code> or <code class="language-plaintext highlighter-rouge">ESC</code> to fall back to the previous. Instead of repeating this in many menus, a generic block can be referenced:</p>
<pre><code class="language-hjson">{
// note that 'recycle' here is arbitrary;
// only 'menus' and 'prompts' is reserved at this level.
recycle: {
prevMenu: [
{
keys: [ "escape" ]
action: @systemMethod:prevMenu
}
]
}
menus: {
someMenu: {
form: {
0: {
actionKeys: @reference:recycle.prevMenu
}
}
}
}
}
</code></pre>
<blockquote>
<p><img class="emoji" title=":information_source:" alt=":information_source:" src="https://github.githubassets.com/images/icons/emoji/unicode/2139.png" height="20" width="20"> An unresolved <code class="language-plaintext highlighter-rouge">@reference</code> will be left intact.</p>
</blockquote>
<h3 id="environment-variables">Environment Variables</h3>
<p>Especially in a container environment such as <a href="/enigma-bbs/installation/docker.html">Docker</a>, environment variable access in configuration files can become very handy. ENiGMA½ provides a flexible way to access variables using the <code class="language-plaintext highlighter-rouge">@environment</code> directive. The most basic form of <code class="language-plaintext highlighter-rouge">@environment:VAR_NAME</code> produces a string value. Additionally a <code class="language-plaintext highlighter-rouge">:type</code> suffix can be supplied to coerece the value to a particular type. Variables pointing to a comma separated list can be turned to arrays using an additional <code class="language-plaintext highlighter-rouge">:array</code> suffix.</p>
<p>Below is a table of the various forms:</p>
<table>
<thead>
<tr>
<th>Form</th>
<th>Variable Value</th>
<th>Produces</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR</code></td>
<td>“Foo”</td>
<td>
<code class="language-plaintext highlighter-rouge">"Foo"</code> (without quotes)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR</code></td>
<td>“123”</td>
<td>
<code class="language-plaintext highlighter-rouge">"123"</code> (without quotes)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:string</code></td>
<td>“Bar”</td>
<td>
<code class="language-plaintext highlighter-rouge">"Bar"</code> (without quotes)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:string:array</code></td>
<td>“Foo,Bar”</td>
<td><code class="language-plaintext highlighter-rouge">[ 'Foo', 'Bar' ]</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:boolean</code></td>
<td>“1”</td>
<td><code class="language-plaintext highlighter-rouge">true</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:boolean</code></td>
<td>“True”</td>
<td><code class="language-plaintext highlighter-rouge">true</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:boolean</code></td>
<td>“false”</td>
<td><code class="language-plaintext highlighter-rouge">false</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:boolean</code></td>
<td>“cat”</td>
<td><code class="language-plaintext highlighter-rouge">false</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:boolean:array</code></td>
<td>“True,false,TRUE”</td>
<td><code class="language-plaintext highlighter-rouge">[ true, false, true ]</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:number</code></td>
<td>“123”</td>
<td><code class="language-plaintext highlighter-rouge">123</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:number:array</code></td>
<td>“123,456”</td>
<td><code class="language-plaintext highlighter-rouge">[ 123, 456 ]</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:number</code></td>
<td>“kitten”</td>
<td>(invalid)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:object</code></td>
<td>’{“a”:”b”}’</td>
<td><code class="language-plaintext highlighter-rouge">{ 'a' : 'b' }</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:object:array</code></td>
<td>’{“a”:”b”},{“c”:”d”}’</td>
<td><code class="language-plaintext highlighter-rouge">[ { 'a' : 'b' }, { 'c' : 'd' } ]</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:timestamp</code></td>
<td>“2020-01-05”</td>
<td>A <a href="https://momentjs.com/">moment</a> object representing 2020-01-05</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">@environment:SOME_VAR:timestamp:array</code></td>
<td>“2020-01-05,2016-05-16T01:15:37’”</td>
<td>An array of <a href="https://momentjs.com/">moment</a> objects representing 2020-01-05 and 2016-05-16T01:15:37</td>
</tr>
</tbody>
</table>
<blockquote>
<p><img class="emoji" title=":bulb:" alt=":bulb:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f4a1.png" height="20" width="20"> <code class="language-plaintext highlighter-rouge">bool</code> may be used as an alias to <code class="language-plaintext highlighter-rouge">boolean</code>.</p>
</blockquote>
<blockquote>
<p><img class="emoji" title=":bulb:" alt=":bulb:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f4a1.png" height="20" width="20"> <code class="language-plaintext highlighter-rouge">timestamp</code> values can be in any form that <a href="https://momentjs.com/docs/#/parsing/">moment can parse</a>.</p>
</blockquote>
<blockquote>
<p><img class="emoji" title=":information_source:" alt=":information_source:" src="https://github.githubassets.com/images/icons/emoji/unicode/2139.png" height="20" width="20"> An unresolved or invalid <code class="language-plaintext highlighter-rouge">@environment</code> will be left intact.</p>
</blockquote>
<p>Consider the following fragment:</p>
<pre><code class="language-hjson">{
foo: {
bar: @environment:BAR_VAR:number
}
}
</code></pre>
<p>If the environment has <code class="language-plaintext highlighter-rouge">BAR_VAR=1337</code>, this would produce:</p>
<pre><code class="language-hjson">{
foo: {
bar: 1337
}
}
</code></pre>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="/enigma-bbs/configuration/config-hjson.html">System Configuration</a></li>
<li><a href="/enigma-bbs/configuration/menu-hjson.html">Menu Configuration</a></li>
<li><a href="/enigma-bbs/configuration/hjson.html">The HJSON Format</a></li>
</ul>
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<a class="btn" style="float: right;margin-left: 20px" href="/enigma-bbs/configuration/config-hjson.html">System Configuration »</a>
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