xpc-interfaces: Provides a Ubiquity command to query interfaces supported by a contract ID.

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function get_ifaces(component) {
  // WARNING: This is implemented in a stupid way.
  var nsis = Components.interfaces.nsISupports;
  var cc = Components.classes;

  var clazz = cc[component].createInstance(nsis);
  var ifaces = Array();

  for each (iface in Components.interfaces) {
    if (clazz instanceof iface) { 
      ifaces.push(iface);
    }
  }

  return ifaces;

}

/* This is a template command */
CmdUtils.CreateCommand({ 
  name: "xpc-interfaces",
  icon: "http://example.com/example.png",
  homepage: "http://example.com/",
  author: { name: "Christopher Granade", email: "cgranade@gmail.com"},
  license: "GPL",
  description: "Lists interfaces supported by an XPCOM component.",
  help: "Select the contract ID of an XPCOM component.",
  takes: {"input": noun_arb_text},

  preview: function( pblock, input ) {

    var compId = input.text;
    
    var itemTemplate = "<li><tt>${interface}</tt></li>";
    var listTemplate =
      "<p>Interfaces supported by <tt>${component}</tt>:</p>" + 
      "<ul>${interfaces}</ul>"
    var errorTemplate = "<strong>${name}</strong>: ${message}";
    var noCompTemplate = "<p>No such component: <tt>${component}</tt></p>";

    try {
      var ifaces = get_ifaces(compId);
      if (ifaces == 0) {
        pblock.innerHTML = CmdUtils.renderTemplate(noCompTemplate, {"component": compId});
      } else {
        var itemHTMLArray = ifaces.map(function (item) {
          return CmdUtils.renderTemplate(itemTemplate, {"interface": item.toString()});
        });

        pblock.innerHTML = CmdUtils.renderTemplate(listTemplate, {"component": compId, "interfaces": itemHTMLArray.join("")});
      }
    } catch (e) {
      pblock.innerHTML = CmdUtils.renderTemplate(errorTemplate, {"name": e.name, "message": e.message});
    }
  },

  execute: function(input) {
    CmdUtils.setSelection("You selected: "+input.html);
  }
});