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398 lines
14 KiB
Plaintext
398 lines
14 KiB
Plaintext
[[smjs-scripting]]
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Scripting ELinks with ECMAScript
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--------------------------------
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As a user of ELinks, you can control its behaviour by writing scripts
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in ECMAScript. Unlike <<ecmascript,scripts in SCRIPT elements of
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HTML>>, these user scripts run with all the permissions of your user
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account, the same as with <<lua-scripting,Lua>>. The object model is
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very different too.
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Support for ECMAScript user scripts was first added in ELinks 0.11.0.
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The `configure` script enables it by default if the required SpiderMonkey
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library has been installed, but you can disable it with `configure
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\--disable-sm-scripting` or by <<CONFIG-SCRIPTING-SPIDERMONKEY,editing
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features.conf>>.
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WARNING: ECMAScript scripting is still a bit experimental: there seem to be
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ways to crash ELinks with it, and the object model may change. However, if
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you don't have a `hooks.js` file, there is not much risk in enabling the
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feature at compile time.
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When ELinks starts up, it evaluates the ECMAScript file `hooks.js` in
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your ELinks configuration directory (thus normally `~/.config/elinks/hooks.js`
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on Unix-like systems), or if the file does not exist there, then in
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the system-wide ELinks configuration directory (the location depends
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on how ELinks was built, but `/etc/elinks/hooks.js` is typical).
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In the ELinks source tree, the `contrib/smjs` directory contains some
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examples about scripting ELinks with ECMAScript. Please see the
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`README` file in that directory for details.
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[[smjs-global-object]]
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Global Object
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~~~~~~~~~~~~~
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The global object provided to ECMAScript user scripts contains the standard
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ECMAScript classes, as well as the following:
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[[smjs-global-methods]]
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Global Object Methods
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^^^^^^^^^^^^^^^^^^^^^
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[[smjs-global.do_file]] do_file(path)::
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Load and evaluate the file with the given path (string). For example:
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+
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--
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----------------------------------------------------------------------
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do_file("/home/me/.config/elinks/hooks.js");
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----------------------------------------------------------------------
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will reload your hooks file.
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*Compatibility:* ELinks 0.11.0
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--
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[[smjs-global-properties]]
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Global Object Properties
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^^^^^^^^^^^^^^^^^^^^^^^^
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[[smjs-global.elinks]] elinks (elinks)::
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A reference to the <<smjs-elinks-object,ELinks object>>.
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+
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*Compatibility:* ELinks 0.11.0
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[[smjs-elinks-object]]
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ELinks Object
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~~~~~~~~~~~~~
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The global <<smjs-global.elinks,'elinks'>> property refers to this object.
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[[smjs-elinks-methods]]
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ELinks Object Methods
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^^^^^^^^^^^^^^^^^^^^^
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[[smjs-elinks.alert]] elinks.alert(message)::
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Display the given message (string) in a message box. For example:
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+
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--
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----------------------------------------------------------------------
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elinks.alert("Hello, world!");
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----------------------------------------------------------------------
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will display a friendly greeting.
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*Compatibility:* ELinks 0.11.0
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--
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[[smjs-elinks.execute]] elinks.execute(command)::
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Execute the given command (string) on the current terminal.
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For example:
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+
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--
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----------------------------------------------------------------------
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var quoted_uri = "'" + elinks.location.replace(/'/g, "'\\''") + "'";
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elinks.execute("firefox " + quoted_uri);
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----------------------------------------------------------------------
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will run Firefox with the URI of the current document.
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*Compatibility:* ELinks 0.12pre1
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WARNING: One must be very careful with 'elinks.execute', because depending
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on the OS, the command may be subject to interpretation by a command
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shell language. When constructing the command string, be sure to quote
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any dubious parts (such as the URI of the current document, as above).
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--
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[[smjs-elinks.load_uri]] elinks.load_uri(uri, callback)::
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Load the given URI (string). When the URI completes loading, ELinks
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calls the given callback (function). The callback is passed the
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<<smjs-cache_entry-object,cache object>> that corresponds to the URI.
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For example:
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+
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--
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----------------------------------------------------------------------
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elinks.load_uri("http://www.eldar.org/cgi-bin/fortune.pl?text_format=yes",
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function (cached) { elinks.alert(cached.content); });
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----------------------------------------------------------------------
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displays a fortune.
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The <<smjs-cache_entry-object,cache object>> will not expire until after the
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callback returns.
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*Compatibility:* ELinks 0.12pre1
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--
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[[smjs-elinks-properties]]
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ELinks Object Properties
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^^^^^^^^^^^^^^^^^^^^^^^^
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[[smjs-elinks.home]] elinks.home (string)::
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ELinks's ``home'' directory, where it stores its configuration files.
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Read-only. For example,
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+
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--
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----------------------------------------------------------------------
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do_file(elinks.home + "hooks.js");
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----------------------------------------------------------------------
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will reload your hooks file.
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*Compatibility:* ELinks 0.11.0
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--
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[[smjs-elinks.location]] elinks.location (string)::
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The URI of the currently open document. This can be read to get a
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string with the URI or set to load a different document.
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For example,
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+
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--
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----------------------------------------------------------------------
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elinks.location = elinks.location + "/..";
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----------------------------------------------------------------------
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will go up a directory (if the URI doesn't end in a file).
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*Compatibility:* ELinks 0.11.0
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--
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[[smjs-elinks.bookmarks]] elinks.bookmarks (hash)::
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This is a hash, the elements of which correspond to the bookmarks.
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One can delve into the bookmarks hierarchy in a reasonably nifty
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fashion, just by using standard ECMAScript syntax:
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+
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--
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----------------------------------------------------------------------
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elinks.bookmarks.x.children.y.children.z.children.foo.title
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----------------------------------------------------------------------
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gets the title of the bookmark titled ``foo'' under the folder ``z'',
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which is a subfolder of ``y'', which is a subfolder of ``x''.
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*Compatibility:* ELinks 0.11.0
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[[smjs-bookmark-properties]]
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A bookmark object has these properties:
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[[smjs-bookmark.title]] item.title (string)::
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This is the title of the bookmark. It can be read and set.
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[[smjs-bookmark.url]] item.url (string)::
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This is the URI of the bookmark. It can be read and set.
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[[smjs-bookmark.children]] item.children (hash)::
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This is a hash, the elements of which are the bookmarks that
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are children to the item. It is read-only.
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--
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[[smjs-elinks.globhist]] elinks.globhist (hash)::
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This is a hash, the elements of which correspond to entries in ELinks's
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global history. The hash is indexed by URI. For example,
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+
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--
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----------------------------------------------------------------------
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elinks.globhist["file:///"]
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----------------------------------------------------------------------
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will get you the history item for your root directory.
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*Compatibility:* ELinks 0.12pre1
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[[smjs-global_history_item-properties]]
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A history item has these properties:
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[[smjs-global_history_item.title]] item.title (string)::
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This is the title of the history item. It can be read and set.
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[[smjs-global_history_item.url]] item.url (string)::
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This is the URI of the history item. It can be read and set.
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[[smjs-global_history_item.last_visit]] item.last_visit (number)::
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This is the UNIX time of the last visit time for the item. UNIX time
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is the number of seconds that have passed between the UNIX epoch
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(which is 1970-01-01 00:00:00 UTC) and the represented time. Note that
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this is 'seconds' since the epoch, whereas ECMAScript likes to use
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'milliseconds' since the epoch. This property can be set or read.
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--
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[[smjs-elinks.action]] elinks.action (hash)::
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This hash lets you call the built-in actions of ELinks. For example,
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you can call `elinks.action.auth_manager()` to open the authentication
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manager. The names of the actions are the same as in elinks.conf or
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in the keybinding manager, except they have underscores instead of
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dashes in order to make them valid ECMAScript identifiers.
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+
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--
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*Compatibility:* ELinks 0.12pre1
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NOTE: When you read an action function from this hash, ELinks binds it to the
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current tab; any later calls to the function throw errors if that tab no
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longer has the focus (in its terminal). This may be changed in a future
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version. It is safest to call the function right away, rather than save it
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in a variable and call it later.
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--
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[[smjs-elinks.keymaps]] elinks.keymaps (hash)::
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This is a hash, the elements of which correspond to ELinks's keymaps.
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Currently, there are three: 'elinks.keymaps.main', 'elinks.keymaps.edit',
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and 'elinks.keymaps.menu'. These elements are also hashes, the elements of
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which correspond to bindings. For example, `elinks.keymaps.main["q"]` is
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the binding to the ``q'' key in the main map. These bindings can be read,
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to get the name of the action to which the key is bound, or set to one of:
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+
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--
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- A string with the name of the ELinks action.
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- A function, which will thenceforth be called when the key is pressed.
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- The string `"none"`, to unbind the key. You can also use the `null`
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value for this purpose, but that crashes ELinks 0.11.4 and 0.12pre1
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(http://bugzilla.elinks.cz/show_bug.cgi?id=1027[bug 1027]),
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so it may be best to use the string for now.
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--
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+
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--
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For example,
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----------------------------------------------------------------------
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elinks.keymaps.main["!"] = function () { elinks.alert("Hello!"); }
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----------------------------------------------------------------------
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binds the ``!'' key in the main map to a function that displays a friendly
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alert.
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----------------------------------------------------------------------
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elinks.keymaps.main["/"] = "search-typeahead-text";
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----------------------------------------------------------------------
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changes the ``/'' key to use the nice typeahead search function instead of
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opening that ugly old search dialogue box.
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*Compatibility:* ELinks 0.11.0, unless you use `null`.
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NOTE: Do not read a function from <<smjs-elinks.action,'elinks.action'>>,
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e.g. `elinks.action.search_typeahead_text`, and place it in a keymap.
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ELinks binds such functions to the current tab when the script reads
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them from 'elinks.action', so they will not work right in other tabs.
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Use the name of the action instead.
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--
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[[smjs-elinks.vs]] elinks.vs (view_state)::
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This property refers to the <<smjs-view_state-object,view-state
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object>> for the current document, if any.
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+
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*Compatibility:* ELinks 0.12pre1
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[[smjs-elinks-hooks]]
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ELinks Object Hooks
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^^^^^^^^^^^^^^^^^^^
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These are actually properties, but a special case: one assigns functions
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to them, which functions are called at certain events.
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In the ELinks source tree, `contrib/smjs/hooks.js` provides a mechanism
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with which multiple scripts can add their functions to the same hooks.
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Please see `contrib/smjs/README` for details.
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[[smjs-elinks.preformat_html]] elinks.preformat_html(cached, vs)::
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This function is called every time a document is loaded, before the
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document is actually rendered, to give scripts the opportunity to
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modify it. The first parameter is the <<smjs-cache_entry-object,cache
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object>> and the second is the <<smjs-view_state-object,view-state
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object>>.
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--
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The <<smjs-cache_entry-object,cache object>> will not expire until after this
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function returns.
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*Compatibility:* ELinks 0.11.1 as described. ELinks 0.11.0 did not provide
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the 'vs' argument.
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--
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[[smjs-elinks.goto_url_hook]] elinks.goto_url_hook(url)::
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This function is called every time the user enters something in the
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'Go to URL' box. The url (string) can be modified or not, and the
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returned string is substituted for what the user entered. If the
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value `false` is returned, the URL is not changed and further hooks
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in ELinks are not run.
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+
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*Compatibility:* ELinks 0.11.0
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[[smjs-elinks.follow_url_hook]] elinks.follow_url_hook(url)::
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This function is called every time the user tries to load a document,
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whether by following a link, by entering a URI in the Go to URL box,
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by setting <<smjs-elinks.location,'elinks.location'>>, or whatever.
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It behaves the same as <<smjs-elinks.goto_url_hook,'elinks.goto_url_hook'>>
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above.
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*Compatibility:* ELinks 0.11.0
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[[smjs-cache_entry-object]]
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Cache Object
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~~~~~~~~~~~~
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The cache object mentioned in the descriptions of
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<<smjs-elinks.load_uri,'elinks.load_uri'>> and
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<<smjs-elinks.preformat_html,'elinks.preformat_html'>> is a wrapper for the
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internal ELinks cache object. ELinks passes the ECMAScript cache object as an
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argument to your ECMAScript function, and keeps the corresponding document in
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the cache until the function returns. After that, ELinks may remove the
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document from the cache, even if the function has saved the cache object to
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some global variable. Such an expired cache object does not work but it does
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not crash ELinks either.
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*Compatibility:* ELinks 0.11.0
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[[smjs-cache_entry-properties]]
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Cache Object Properties
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^^^^^^^^^^^^^^^^^^^^^^^
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[[smjs-cache_entry.content]] cached.content (string)::
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This is the content received from the server. It can be read and set.
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[[smjs-cache_entry.type]] cached.type (string)::
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This is the MIME type of the cache entry. It can be read and set.
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[[smjs-cache_entry.length]] cached.length (number)::
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This is the length of cached.content. It is read-only.
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[[smjs-cache_entry.head]] cached.head (string)::
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This is the header received from the server. It can be read and set.
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[[smjs-cache_entry.uri]] cached.uri (string)::
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This is the URI of the cache entry. It is read-only.
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[[smjs-view_state-object]]
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View-state Object
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~~~~~~~~~~~~~~~~~
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The view-state object mentioned in the descriptions of
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<<smjs-elinks.preformat_html,'elinks.preformat_html'>> and
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<<smjs-elinks.vs,'elinks.vs'>> is a wrapper for the internal ELinks view_state
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object. The view state holds information on how the current document is being
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displayed.
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*Compatibility:* ELinks 0.11.1
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[[smjs-view_state-properties]]
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View-state Object Properties
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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[[smjs.view_state.plain]] vs.plain (boolean)::
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Whether the current document is rendered as HTML or displayed
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as plaintext. This can be read and set.
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[[smjs.view_state.uri]] vs.uri (string)::
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This is the URI of the current document. It is read-only.
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