Sorry, stashed changes including:

Change util.range to accept an increment as the third argument.
    Sanitize Makefile.doc

common/content/buffer.js

@@ -1064,7 +1064,7 @@ function Buffer() //{{{
                 let res = buffer.evaluateXPath(options["hinttags"], frame.document);
                 for (let [,regex] in Iterator(regexps))
                 {
-                    for (let i in util.range(res.snapshotLength, 0, true))
+                    for (let i in util.range(res.snapshotLength, 0, -1))
                     {
                         let elem = res.snapshotItem(i);
                         if (regex.test(elem.textContent))

common/content/completion.js

@@ -554,10 +554,10 @@ CompletionContext.prototype = {
     {
         let self = this;
         let items = this.items;
-        let reverse = start > end;
+        let step = start > end ? -1 : 1;
         start = Math.max(0, start || 0);
         end = Math.min(items.length, end ? end : items.length);
-        return util.map(util.range(start, end, reverse), function (i) items[i]);
+        return util.map(util.range(start, end, step), function (i) items[i]);
     },
 
     getRows: function getRows(start, end, doc)
@@ -565,10 +565,10 @@ CompletionContext.prototype = {
         let self = this;
         let items = this.items;
         let cache = this.cache.rows;
-        let reverse = start > end;
+        let step = start > end ? -1 : 1;
         start = Math.max(0, start || 0);
         end = Math.min(items.length, end != null ? end : items.length);
-        for (let i in util.range(start, end, reverse))
+        for (let i in util.range(start, end, step))
             yield [i, cache[i] = cache[i] || util.xmlToDom(self.createRow(items[i]), doc)];
     },
 

common/content/editor.js

@@ -204,7 +204,7 @@ function Editor() //{{{
             function (args)
             {
                 let matches = args.string.match(RegExp("^\\s*($|" + abbrevmatch + ")(?:\\s*$|\\s+(.*))"));
-                if (! matches)
+                if (!matches)
                 {
                     liberator.echoerr("E474: Invalid argument");
                     return false;

common/content/util.js

@@ -519,25 +519,28 @@ const util = { //{{{
     },
 
     /**
-     * A generator that returns the values between <b>start</b> and <b>end</b>.
-     * If <b>reverse</b> is true then the values are returned in reverse order.
+     * A generator that returns the values between <b>start</b> and <b>end</b>,
+     * in <b>step</b> increments.
      *
      * @param {number} start The interval's start value.
      * @param {number} end The interval's end value.
-     * @param {boolean} reverse Reverse the order in which the values are produced.
+     * @param {boolean} step The value to step the range by. May be
+     *     negative. @default 1
      * @returns {Iterator(Object)}
      */
-    range: function range(start, end, reverse)
+    range: function range(start, end, step)
     {
-        if (!reverse)
+        if (!step)
+            step = 1;
+        if (step > 0)
         {
-            while (start < end)
-                yield start++;
+            for (; start < end; start += step)
+                yield start;
         }
         else
         {
             while (start > end)
-                yield --start;
+                yield start += step;
         }
     },