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

common/modules/prefs.jsm

@@ -131,7 +131,7 @@ const Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference
         if (saved == null && curval != defval || curval != saved) {
             let msg = "Warning: setting preference " + name + ", but it's changed from its default value.";
             if (message)
-                msg += " " + message;
+                msg = template.linkifyHelp(msg + " " + message);
             util.dactyl.echomsg(msg);
         }
     },

common/modules/template.jsm

@@ -7,7 +7,8 @@
 Components.utils.import("resource://dactyl/base.jsm");
 defineModule("template", {
     exports: ["Template", "template"],
-    require: ["util"]
+    require: ["util"],
+    use: ["services"]
 });
 
 default xml namespace = XHTML;
@@ -78,6 +79,16 @@ const Template = Module("Template", {
         // </e4x>
     },
 
+    helpLink: function (topic, type) {
+        if (services["dactyl:"].initialized && !set.has(services["dactyl:"].HELP_TAGS, topic))
+            return <>{topic}</>;
+
+        XML.ignoreWhitespace = false; XML.prettyPrinting = false;
+        type = type || /^'.*'$/.test(topic) ? "HelpOpt" :
+                       /^:\w/.test(topic)   ? "HelpEx"  : "HelpKey";
+        return <a highlight={type} href={"dactyl://help-tag/" + topic} dactyl:command="dactyl.help" xmlns:dactyl={NS}>{topic}</a>
+    },
+
     // if "processStrings" is true, any passed strings will be surrounded by " and
     // any line breaks are displayed as \n
     highlight: function highlight(arg, processStrings, clip) {
@@ -199,6 +210,21 @@ const Template = Module("Template", {
         // </e4x>
     },
 
+    linkifyHelp: function linkifyHelp(str) {
+        util.dactyl.initHelp();
+
+        let re = util.regexp(<![CDATA[
+            ([/\s]|^)
+            ( '[\w-]+' | :(?:[\w-]+|!) | (?:._)?<[\w-]+> )
+            (?=[[!,;./\s]|$)
+        ]]>, "g");
+        return this.highlightSubstrings(str, (function () {
+            let res;
+            while ((res = re.exec(str)) && res[2].length)
+                yield [res.index + res[1].length, res[2].length];
+        })(), template.helpLink);
+    },
+
     options: function options(title, opts) {
         XML.ignoreWhitespace = false; XML.prettyPrinting = false;
         // <e4x>
@@ -285,8 +311,9 @@ const Template = Module("Template", {
         // </e4x>
     },
 
-    usage: function usage(iter) {
+    usage: function usage(iter, format) {
         XML.ignoreWhitespace = false; XML.prettyPrinting = false;
+        let desc = format && format.description || function (item) template.linkifyHelp(item.description);
         // <e4x>
         return <table>
             {
@@ -298,7 +325,7 @@ const Template = Module("Template", {
                                 <span highlight="Title">{name}</span> + <> </> +
                                 <span highlight="LineInfo">Defined at {template.sourceLink(frame)}</span>
                     }</td>
-                    <td>{item.description}</td>
+                    <td>{desc(item)}</td>
                 </tr>)
             }
             </table>;

common/modules/util.jsm

@@ -30,7 +30,7 @@ memoize(this, "Commands", function () {
 
 const FailedAssertion = Class("FailedAssertion", Error, {
     init: function (message) {
-        this.message = message;
+        update(this, Error(message))
     }
 });
 
@@ -102,7 +102,7 @@ const Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      */
     assert: function (condition, message) {
         if (!condition)
-            throw new FailedAssertion(message);
+            throw FailedAssertion(message);
     },
 
     get chromePackages() {