Add :list* commands, linkify help tags in certain output, and augment :yank to accept JavaScript directly.

common/content/options.js

@@ -817,6 +817,36 @@ const Options = Module("options", {
 }, {
 }, {
     commands: function () {
+        let args = {
+            getMode: function (args) findMode(args["-mode"]),
+            iterate: function (args) {
+                for (let map in mappings.iterate(this.getMode(args)))
+                    for (let name in values(map.names))
+                        yield { name: name, __proto__: map };
+            },
+            format: {
+                description: function (map) (XML.ignoreWhitespace = false, XML.prettyPrinting = false, <>
+                        {options.get("passkeys").has(map.name)
+                            ? <span highlight="URLExtra">(passed by {template.helpLink("'passkeys'")})</span>
+                            : <></>}
+                        {template.linkifyHelp(map.description)}
+                </>)
+            }
+        }
+
+        dactyl.addUsageCommand({
+            name: ["listo[ptions]", "lo"],
+            description: "List all options along with their short descriptions",
+            iterate: function (args) options,
+            format: {
+                description: function (opt) (XML.ignoreWhitespace = false, XML.prettyPrinting = false, <>
+                        {opt.scope == Option.SCOPE_LOCAL
+                            ? <span highlight="URLExtra">(buffer local)</span> : ""}
+                        {template.linkifyHelp(opt.description)}
+                </>)
+            }
+        });
+
         function setAction(args, modifiers) {
             let bang = args.bang;
             if (!args.length)