Add support for verbose :set querying of options.

Querying of commands, autocommands, mappings, abbreviations, highlight
groups, and styles should also be supported.

common/content/options.js

@@ -111,12 +111,18 @@ function Option(names, description, type, defaultValue, extraInfo) //{{{
      * @see #has
      */
     this.checkHas = extraInfo.checkHas || null;
+
     /**
      * @property {boolean} Set to true whenever the option is first set. This
      * is useful to see whether it was changed from its default value
      * interactively or by some RC file.
      */
     this.hasChanged = false;
+    /**
+     * @property {nsIFile} The script in which this option was last set. null
+     *     implies an interactive command.
+     */
+    this.setFrom = null;
 
     // add no{option} variant of boolean {option} to this.names
     if (this.type == "boolean")
@@ -572,6 +578,7 @@ function Options() //{{{
                 }
 
                 if (name == "all" && reset)
+                    // TODO: Why? --djk
                     liberator.echoerr("You can't reset all options, it could make " + config.hostApplication + " unusable.");
                 else if (name == "all")
                     options.listPrefs(onlyNonDefault, "");
@@ -620,7 +627,10 @@ function Options() //{{{
                         option.reset();
                 }
                 else
+                {
+                    option.setFrom = modifiers.setFrom || null;
                     option.reset();
+                }
             }
             // read access
             else if (opt.get)
@@ -630,9 +640,15 @@ function Options() //{{{
                 else
                 {
                     if (option.type == "boolean")
-                        liberator.echo((opt.optionValue ? "  " : "no") + option.name);
+                        var msg = (opt.optionValue ? "  " : "no") + option.name;
                     else
-                        liberator.echo("  " + option.name + "=" + opt.optionValue);
+                        msg = "  " + option.name + "=" + opt.optionValue;
+
+                    if (options["verbose"] > 0 && option.setFrom)
+                        msg += "\n        Last set from " + option.setFrom.path;
+
+                    // FIXME: Message highlight group wrapping messes up the indent up for multi-arg verbose :set queries
+                    liberator.echo(<span highlight="CmdOutput">{msg}</span>);
                 }
             }
             // write access
@@ -640,6 +656,8 @@ function Options() //{{{
             // improved. i.e. Vim's behavior is pretty sloppy to no real benefit
             else
             {
+                option.setFrom = modifiers.setFrom || null;
+
                 if (opt.option.type == "boolean")
                 {
                     if (opt.valueGiven)
@@ -832,9 +850,10 @@ function Options() //{{{
 
     commands.add(["setl[ocal]"],
         "Set local option",
-        function (args)
+        function (args, modifiers)
         {
-            return setAction(args, { scope: options.OPTION_SCOPE_LOCAL });
+            modifiers.scope = options.OPTION_SCOPE_LOCAL;
+            setAction(args, modifiers);
         },
         {
             bang: true,
@@ -849,9 +868,10 @@ function Options() //{{{
 
     commands.add(["setg[lobal]"],
         "Set global option",
-        function (args)
+        function (args, modifiers)
         {
-            return setAction(args, { scope: options.OPTION_SCOPE_GLOBAL });
+            modifiers.scope = options.OPTION_SCOPE_GLOBAL;
+            setAction(args, modifiers);
         },
         {
             bang: true,
@@ -866,10 +886,7 @@ function Options() //{{{
 
     commands.add(["se[t]"],
         "Set an option",
-        function (args)
-        {
-            return setAction(args);
-        },
+        function (args, modifiers) { setAction(args, modifiers); },
         {
             bang: true,
             completer: function (context, args)