2 * (C) Copyright 2007-2009 John J. Foerch
3 * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
5 * Use, modification, and distribution are subject to the terms specified in the
11 var interactive_commands = {};
14 * name: string name of the command.
16 * doc: Documentation string, may be null.
18 * handler: A function to handle the command.
20 * The $prefix keyword, when true, means that the command
21 * is a prefix-command.
23 define_keywords("$prefix", "$browser_object", "$prompt");
24 function interactive (name, doc, handler) {
29 browser_object: arguments.$browser_object,
30 prefix: arguments.$prefix,
32 shortdoc: get_shortdoc_string(doc),
33 prompt: arguments.$prompt,
34 source_code_reference: get_caller_source_code_reference() };
35 interactive_commands[name] = cmd;
39 function interactive_error (str) {
40 var e = new Error(str);
41 e.__proto__ = interactive_error.prototype;
44 interactive_error.prototype.__proto__ = Error.prototype;
47 function interactive_context (buffer) {
48 this.local = conkeror;
51 this.window = this.buffer.window;
53 this.local = buffer.page.local;
55 this.local = buffer.local;
59 interactive_context.prototype = {
60 constructor: interactive_context,
61 toString: function () "#<interactive_context>",
62 get P () this.prefix_argument,
63 get p () univ_arg_to_number(this.prefix_argument),
64 set p (default_value) univ_arg_to_number(this.prefix_argument, default_value),
65 get minibuffer () this.window.minibuffer,
66 prefix_argument: null,
71 function handle_interactive_error (window, e) {
74 if (e instanceof interactive_error) {
75 window.minibuffer.message(e.message);
76 } else if (e instanceof abort) {
77 window.minibuffer.message("Quit");
80 window.minibuffer.message("call interactively: " + e);
84 // Coroutine that runs an interactive command synchronously.
85 // Returns true if prefix command, returns false otherwise.
86 // Exceptions are allowed to pass through.
87 function run_interactively (I, command) {
89 var window = I.window;
91 if (typeof command == "function") {
92 // Special interactive command
94 yield co_return(false);
97 var cmd = interactive_commands[command];
99 throw interactive_error("Invalid command: " + command);
102 handler = cmd.handler;
104 while (typeof handler == "string") {
105 let parent = interactive_commands[handler];
106 handler = parent.handler;
107 if (handler == command) {
108 throw interactive_error("circular command alias: " + command);
114 yield co_return(cmd.prefix ? true : false);
118 * Runs the interactive command asynchronously.
120 * Returns a Promise which will be resolved (with `undefined') when
121 * the command completes.
123 function call_interactively (I, command) {
124 return spawn(function () {
126 yield run_interactively(I, command);
128 handle_interactive_error(I.window, e);
133 function alternates () {
134 let alts = Array.prototype.slice.call(arguments, 0);
135 return function (I) {
137 if (array_p(I.prefix_argument)) {
138 let num = I.prefix_argument = I.prefix_argument[0];
139 while (num >= 4 && index + 1 < alts.length) {
144 yield alts[index](I);
150 * Utility functions for use in the rc to alter the behavior
151 * of interactive commands.
153 function set_handler (name, handler) {
154 var cmd = interactive_commands[name];
155 cmd.handler = handler;
158 function set_default_browser_object (name, browser_object) {
159 var cmd = interactive_commands[name];
160 cmd.browser_object = browser_object;
163 provide("interactive");