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+ <section id="unit-converter-plugin">
+<span id="id1"></span><h1>Unit converter plugin<a class="headerlink" href="#unit-converter-plugin" title="Link to this heading">¶</a></h1>
+<p id="module-searx.plugins.unit_converter">A plugin for converting measured values from one unit to another unit (a
+unit converter).</p>
+<p>The plugin looks up the symbols (given in the query term) in a list of
+converters, each converter is one item in the list (compare
+<a class="reference internal" href="#searx.plugins.unit_converter.ADDITIONAL_UNITS" title="searx.plugins.unit_converter.ADDITIONAL_UNITS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ADDITIONAL_UNITS</span></code></a>). If the symbols are ambiguous, the matching units
+of measurement are evaluated. The weighting in the evaluation results from the
+sorting of the <a class="reference internal" href="#searx.plugins.unit_converter.symbol_to_si" title="searx.plugins.unit_converter.symbol_to_si"><code class="xref py py-obj docutils literal notranslate"><span class="pre">list</span> <span class="pre">of</span> <span class="pre">unit</span> <span class="pre">converters</span></code></a>.</p>
+<p>Enable in <code class="docutils literal notranslate"><span class="pre">settings.yml</span></code>:</p>
+<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">enabled_plugins</span><span class="p">:</span>
+<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">..</span>
+<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">- &#39;Unit converter plugin&#39;</span>
+</pre></div>
+</div>
+<dl class="py function">
+<dt class="sig sig-object py" id="searx.plugins.unit_converter.symbol_to_si">
+<span class="sig-prename descclassname"><span class="pre">searx.plugins.unit_converter.</span></span><span class="sig-name descname"><span class="pre">symbol_to_si</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/searx/plugins/unit_converter.html#symbol_to_si"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#searx.plugins.unit_converter.symbol_to_si" title="Link to this definition">¶</a></dt>
+<dd><p>Generates a list of tuples, each tuple is a measure unit and the fields
+in the tuple are:</p>
+<ol class="arabic simple" start="0">
+<li><p>Symbol of the measure unit (e.g. ‘mi’ for measure unit ‘miles’ Q253276)</p></li>
+<li><p>SI name of the measure unit (e.g. Q11573 for SI unit ‘metre’)</p></li>
+<li><p>Factor to get SI value from measure unit (e.g. 1mi is equal to SI 1m
+multiplied by 1609.344)</p></li>
+<li><p>Factor to get measure value from from SI value (e.g. SI 100m is equal to
+100mi divided by 1609.344)</p></li>
+</ol>
+<p>The returned list is sorted, the first items are created from
+<code class="docutils literal notranslate"><span class="pre">WIKIDATA_UNITS</span></code>, the second group of items is build from
+<a class="reference internal" href="#searx.plugins.unit_converter.ADDITIONAL_UNITS" title="searx.plugins.unit_converter.ADDITIONAL_UNITS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ADDITIONAL_UNITS</span></code></a> and items created from <a class="reference internal" href="#searx.plugins.unit_converter.ALIAS_SYMBOLS" title="searx.plugins.unit_converter.ALIAS_SYMBOLS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ALIAS_SYMBOLS</span></code></a>.</p>
+<p>If you search this list for a symbol, then a match with a symbol from
+Wikidata has the highest weighting (first hit in the list), followed by the
+symbols from the <a class="reference internal" href="#searx.plugins.unit_converter.ADDITIONAL_UNITS" title="searx.plugins.unit_converter.ADDITIONAL_UNITS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ADDITIONAL_UNITS</span></code></a> and the lowest weighting is
+given to the symbols resulting from the aliases <a class="reference internal" href="#searx.plugins.unit_converter.ALIAS_SYMBOLS" title="searx.plugins.unit_converter.ALIAS_SYMBOLS"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ALIAS_SYMBOLS</span></code></a>.</p>
+</dd></dl>
+
+<dl class="py data">
+<dt class="sig sig-object py" id="searx.plugins.unit_converter.ADDITIONAL_UNITS">
+<span class="sig-prename descclassname"><span class="pre">searx.plugins.unit_converter.</span></span><span class="sig-name descname"><span class="pre">ADDITIONAL_UNITS</span></span><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">[{'from_si':</span> <span class="pre">&lt;function</span> <span class="pre">&lt;lambda&gt;&gt;,</span> <span class="pre">'si_name':</span> <span class="pre">'Q11579',</span> <span class="pre">'symbol':</span> <span class="pre">'°C',</span> <span class="pre">'to_si':</span> <span class="pre">&lt;function</span> <span class="pre">&lt;lambda&gt;&gt;},</span> <span class="pre">{'from_si':</span> <span class="pre">&lt;function</span> <span class="pre">&lt;lambda&gt;&gt;,</span> <span class="pre">'si_name':</span> <span class="pre">'Q11579',</span> <span class="pre">'symbol':</span> <span class="pre">'°F',</span> <span class="pre">'to_si':</span> <span class="pre">&lt;function</span> <span class="pre">&lt;lambda&gt;&gt;}]</span></em><a class="headerlink" href="#searx.plugins.unit_converter.ADDITIONAL_UNITS" title="Link to this definition">¶</a></dt>
+<dd><p>Additional items to convert from a measure unit to a SI unit (vice versa).</p>
+<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
+ <span class="s2">&quot;si_name&quot;</span><span class="p">:</span> <span class="s2">&quot;Q11579&quot;</span><span class="p">,</span> <span class="c1"># Wikidata item ID of the SI unit (Kelvin)</span>
+ <span class="s2">&quot;symbol&quot;</span><span class="p">:</span> <span class="s2">&quot;°C&quot;</span><span class="p">,</span> <span class="c1"># symbol of the measure unit</span>
+ <span class="s2">&quot;to_si&quot;</span><span class="p">:</span> <span class="k">lambda</span> <span class="n">val</span><span class="p">:</span> <span class="n">val</span> <span class="o">+</span> <span class="mf">273.15</span><span class="p">,</span> <span class="c1"># convert measure value (val) to SI unit</span>
+ <span class="s2">&quot;from_si&quot;</span><span class="p">:</span> <span class="k">lambda</span> <span class="n">val</span><span class="p">:</span> <span class="n">val</span> <span class="o">-</span> <span class="mf">273.15</span><span class="p">,</span> <span class="c1"># convert SI value (val) measure unit</span>
+<span class="p">},</span>
+<span class="p">{</span>
+ <span class="s2">&quot;si_name&quot;</span><span class="p">:</span> <span class="s2">&quot;Q11573&quot;</span><span class="p">,</span>
+ <span class="s2">&quot;symbol&quot;</span><span class="p">:</span> <span class="s2">&quot;mi&quot;</span><span class="p">,</span>
+ <span class="s2">&quot;to_si&quot;</span><span class="p">:</span> <span class="mf">1609.344</span><span class="p">,</span> <span class="c1"># convert measure value (val) to SI unit</span>
+ <span class="s2">&quot;from_si&quot;</span><span class="p">:</span> <span class="mi">1</span> <span class="o">/</span> <span class="mf">1609.344</span> <span class="c1"># convert SI value (val) measure unit</span>
+<span class="p">},</span>
+</pre></div>
+</div>
+<p>The values of <code class="docutils literal notranslate"><span class="pre">to_si</span></code> and <code class="docutils literal notranslate"><span class="pre">from_si</span></code> can be of <a class="reference external" href="https://docs.python.org/3/library/functions.html#float" title="(in Python v3.12)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">float</span></code></a> (a multiplier)
+or a <a class="reference external" href="https://docs.python.org/3/glossary.html#term-callable">callable</a> (val in / converted value returned).</p>
+</dd></dl>
+
+<dl class="py data">
+<dt class="sig sig-object py" id="searx.plugins.unit_converter.ALIAS_SYMBOLS">
+<span class="sig-prename descclassname"><span class="pre">searx.plugins.unit_converter.</span></span><span class="sig-name descname"><span class="pre">ALIAS_SYMBOLS</span></span><em class="property"><span class="w"> </span><span class="p"><span class="pre">=</span></span><span class="w"> </span><span class="pre">{'mi':</span> <span class="pre">('L',),</span> <span class="pre">'°C':</span> <span class="pre">('C',),</span> <span class="pre">'°F':</span> <span class="pre">('F',)}</span></em><a class="headerlink" href="#searx.plugins.unit_converter.ALIAS_SYMBOLS" title="Link to this definition">¶</a></dt>
+<dd><p>Alias symbols for known unit of measure symbols / by example:</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="s1">&#39;°C&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;C&#39;</span><span class="p">,</span> <span class="o">...</span><span class="p">),</span> <span class="c1"># list of alias symbols for °C (Q69362731)</span>
+<span class="s1">&#39;°F&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;F&#39;</span><span class="p">,</span> <span class="o">...</span><span class="p">),</span> <span class="c1"># list of alias symbols for °F (Q99490479)</span>
+<span class="s1">&#39;mi&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;L&#39;</span><span class="p">,),</span> <span class="c1"># list of alias symbols for mi (Q253276)</span>
+</pre></div>
+</div>
+</dd></dl>
+
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+<li class="toctree-l2"><a class="reference internal" href="searx.plugins.tor_check.html">Tor check plugin</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Unit converter plugin</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#searx.plugins.unit_converter.symbol_to_si"><code class="docutils literal notranslate"><span class="pre">symbol_to_si()</span></code></a></li>
+<li class="toctree-l3"><a class="reference internal" href="#searx.plugins.unit_converter.ADDITIONAL_UNITS"><code class="docutils literal notranslate"><span class="pre">ADDITIONAL_UNITS</span></code></a></li>
+<li class="toctree-l3"><a class="reference internal" href="#searx.plugins.unit_converter.ALIAS_SYMBOLS"><code class="docutils literal notranslate"><span class="pre">ALIAS_SYMBOLS</span></code></a></li>
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