Add commands command to run commands returned from a filter (#7073)

core/language/en-GB/Help/commands.tid

@@ -0,0 +1,14 @@
+title: $:/language/Help/commands
+description: Run commands returned from a filter
+
+It runs sequentially the commands returned from the filter.
+
+```
+--commands <filter>
+```
+
+Examples
+
+`--commands "[enlist{$:/build-commands-as-text}]"`
+
+`--commands "[{$:/build-commands-as-json}jsonindexes[]] :map[{$:/build-commands-as-json}jsonget<currentTiddler>]"`

core/modules/commands/commands.js

@@ -0,0 +1,43 @@
+/*\
+title: $:/core/modules/commands/commands.js
+type: application/javascript
+module-type: command
+
+Runs sequentially the commands returned from the filter.
+
+\*/
+
+(function() {
+
+  /*jslint node: true, browser: true */
+  /*global $tw: false */
+  "use strict";
+
+  exports.info = {
+    name: "commands",
+    synchronous: true
+  };
+
+  var Command = function(params, commander) {
+    this.params = params;
+    this.commander = commander;
+  };
+
+  Command.prototype.execute = function() {
+    // Parse the filter
+    var filter = this.params[0];
+    if(!filter) {
+      return "No filter specified";
+    }
+    var commands = this.commander.wiki.filterTiddlers(filter)
+    if(commands.length === 0) {
+      return "No tiddlers found for filter '" + filter + "'";
+    }
+
+    this.commander.addCommandTokens(commands);
+    return null;
+  };
+
+  exports.Command = Command;
+
+})();