Use a new scorer to improve search results.

This makes the other pages take less priority than the API results.
It's kind of biased, but hopefully it helps out.

docs/_static/scorer.js

@@ -0,0 +1,78 @@
+var _queryBeingDone = null;
+var _pattern = null;
+var _escapedRegex = /[-\/\\^$*+?.()|[\]{}]/g;
+function escapeRegex(e) {
+    return e.replace(_escapedRegex, '\\$&');
+}
+
+// for some reason Sphinx shows some entries twice
+// if something has been scored already I'd rather sort it to the bottom
+var _beenScored = new Set();
+
+function __score(haystack, regex) {
+    let match = regex.exec(haystack);
+    if(match == null) {
+        return Number.MAX_VALUE;
+    }
+    let subLength = match[0].length;
+    let start = match.index;
+    return (subLength * 1000 + start) / 1000.0;
+}
+
+// unused for now
+function __cleanNamespaces(query) {
+    return query.replace(/(discord\.(ext\.)?)?(.+)/, '$3');
+}
+
+var Scorer = {
+    // Implement the following function to further tweak the score for each result
+    // The function takes a result array [filename, title, anchor, descr, score]
+    // and returns the new score.
+
+    score: function(result) {
+      // only inflate the score of things that are actual API reference things
+      if(_pattern !== null && result[1].startsWith('discord.')) {
+        let _score = __score(result[1], _pattern);
+        if(_score === Number.MAX_VALUE) {
+            return result[4];
+        }
+        if(_beenScored.has(result[1])) {
+            return 0;
+        }
+        _beenScored.add(result[1]);
+        let newScore = 100 + _queryBeingDone.length - _score;
+        // console.log(`${result[1]}: ${result[4]} -> ${newScore} (${_score})`);
+        return newScore;
+      }
+      return result[4];
+    },
+
+
+    // query matches the full name of an object
+    objNameMatch: 15,
+    // or matches in the last dotted part of the object name
+    objPartialMatch: 11,
+    // Additive scores depending on the priority of the object
+    objPrio: {0:  15,   // used to be importantResults
+              1:  7,   // used to be objectResults
+              2: -5},  // used to be unimportantResults
+    //  Used when the priority is not in the mapping.
+    objPrioDefault: 0,
+
+    // query found in title
+    title: 15,
+    partialTitle: 7,
+    // query found in terms
+    term: 5,
+    partialTerm: 2
+};
+
+
+$(document).ready(function() {
+    let params = $.getQueryParameters();
+    if(params.q) {
+        _queryBeingDone = params.q[0];
+        let pattern = Array.from(_queryBeingDone).map(escapeRegex).join('.*?');
+        _pattern = new RegExp(pattern, 'i');
+    }
+});

docs/conf.py

@@ -234,7 +234,7 @@ html_static_path = ['_static']
 
 # The name of a javascript file (relative to the configuration directory) that
 # implements a search results scorer. If empty, the default will be used.
-#html_search_scorer = 'scorer.js'
+html_search_scorer = '_static/scorer.js'
 
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'discord.pydoc'