gnome-shell/js/misc/util.js

237 lines
8.0 KiB
JavaScript
Raw Normal View History

// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Clutter = imports.gi.Clutter;
const GLib = imports.gi.GLib;
const St = imports.gi.St;
const Main = imports.ui.main;
// http://daringfireball.net/2010/07/improved_regex_for_matching_urls
const _balancedParens = '\\((?:[^\\s()<>]+|(?:\\(?:[^\\s()<>]+\\)))*\\)';
const _leadingJunk = '[\\s`(\\[{\'\\"<\u00AB\u201C\u2018]';
const _notTrailingJunk = '[^\\s`!()\\[\\]{};:\'\\".,<>?\u00AB\u00BB\u201C\u201D\u2018\u2019]';
const _urlRegexp = new RegExp(
'(^|' + _leadingJunk + ')' +
'(' +
'(?:' +
'[a-z][\\w-]+://' + // scheme://
'|' +
'www\\d{0,3}[.]' + // www.
'|' +
'[a-z0-9.\\-]+[.][a-z]{2,4}/' + // foo.xx/
')' +
'(?:' + // one or more:
'[^\\s()<>]+' + // run of non-space non-()
'|' + // or
_balancedParens + // balanced parens
')+' +
'(?:' + // end with:
_balancedParens + // balanced parens
'|' + // or
_notTrailingJunk + // last non-junk char
')' +
')', 'gi');
// findUrls:
// @str: string to find URLs in
//
// Searches @str for URLs and returns an array of objects with %url
// properties showing the matched URL string, and %pos properties indicating
// the position within @str where the URL was found.
//
// Return value: the list of match objects, as described above
function findUrls(str) {
let res = [], match;
while ((match = _urlRegexp.exec(str)))
res.push({ url: match[2], pos: match.index + match[1].length });
return res;
}
// spawn:
// @argv: an argv array
//
// Runs @argv in the background, handling any errors that occur
// when trying to start the program.
function spawn(argv) {
try {
trySpawn(argv);
} catch (err) {
_handleSpawnError(argv[0], err);
}
}
// spawnCommandLine:
// @command_line: a command line
//
// Runs @command_line in the background, handling any errors that
// occur when trying to parse or start the program.
function spawnCommandLine(command_line) {
try {
let [success, argv] = GLib.shell_parse_argv(command_line);
trySpawn(argv);
} catch (err) {
_handleSpawnError(command_line, err);
}
}
// trySpawn:
// @argv: an argv array
//
// Runs @argv in the background. If launching @argv fails,
// this will throw an error.
function trySpawn(argv)
{
var success, pid;
try {
[success, pid] = GLib.spawn_async(null, argv, null,
GLib.SpawnFlags.SEARCH_PATH | GLib.SpawnFlags.DO_NOT_REAP_CHILD,
null);
} catch (err) {
/* Rewrite the error in case of ENOENT */
if (err.matches(GLib.SpawnError, GLib.SpawnError.NOENT)) {
throw new GLib.SpawnError({ code: GLib.SpawnError.NOENT,
message: _("Command not found") });
} else if (err instanceof GLib.Error) {
// The exception from gjs contains an error string like:
// Error invoking GLib.spawn_command_line_async: Failed to
// execute child process "foo" (No such file or directory)
// We are only interested in the part in the parentheses. (And
// we can't pattern match the text, since it gets localized.)
let message = err.message.replace(/.*\((.+)\)/, '$1');
throw new (err.constructor)({ code: err.code,
message: message });
} else {
throw err;
}
}
// Dummy child watch; we don't want to double-fork internally
// because then we lose the parent-child relationship, which
// can break polkit. See https://bugzilla.redhat.com//show_bug.cgi?id=819275
GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, function () {}, null);
}
// trySpawnCommandLine:
// @command_line: a command line
//
// Runs @command_line in the background. If launching @command_line
// fails, this will throw an error.
function trySpawnCommandLine(command_line) {
let success, argv;
try {
[success, argv] = GLib.shell_parse_argv(command_line);
} catch (err) {
// Replace "Error invoking GLib.shell_parse_argv: " with
// something nicer
err.message = err.message.replace(/[^:]*: /, _("Could not parse command:") + "\n");
throw err;
}
trySpawn(argv);
}
function _handleSpawnError(command, err) {
let title = _("Execution of '%s' failed:").format(command);
Main.notifyError(title, err.message);
}
// killall:
// @processName: a process name
//
// Kills @processName. If no process with the given name is found,
// this will fail silently.
function killall(processName) {
try {
// pkill is more portable than killall, but on Linux at least
// it won't match if you pass more than 15 characters of the
// process name... However, if you use the '-f' flag to match
// the entire command line, it will work, but we have to be
// careful in that case that we can match
// '/usr/bin/processName' but not 'gedit processName.c' or
// whatever...
let argv = ['pkill', '-f', '^([^ ]*/)?' + processName + '($| )'];
GLib.spawn_sync(null, argv, null, GLib.SpawnFlags.SEARCH_PATH, null);
// It might be useful to return success/failure, but we'd need
// a wrapper around WIFEXITED and WEXITSTATUS. Since none of
// the current callers care, we don't bother.
} catch (e) {
logError(e, 'Failed to kill ' + processName);
}
}
// lowerBound:
// @array: an array or array-like object, already sorted
// according to @cmp
// @val: the value to add
// @cmp: a comparator (or undefined to compare as numbers)
//
// Returns the position of the first element that is not
// lower than @val, according to @cmp.
// That is, returns the first position at which it
// is possible to insert @val without violating the
// order.
// This is quite like an ordinary binary search, except
// that it doesn't stop at first element comparing equal.
function lowerBound(array, val, cmp) {
let min, max, mid, v;
cmp = cmp || function(a, b) { return a - b; };
if (array.length == 0)
return 0;
min = 0; max = array.length;
while (min < (max - 1)) {
mid = Math.floor((min + max) / 2);
v = cmp(array[mid], val);
if (v < 0)
min = mid + 1;
else
max = mid;
}
return (min == max || cmp(array[min], val) < 0) ? max : min;
}
// insertSorted:
// @array: an array sorted according to @cmp
// @val: a value to insert
// @cmp: the sorting function
//
// Inserts @val into @array, preserving the
// sorting invariants.
// Returns the position at which it was inserted
function insertSorted(array, val, cmp) {
let pos = lowerBound(array, val, cmp);
array.splice(pos, 0, val);
return pos;
}
function makeCloseButton() {
let closeButton = new St.Button({ style_class: 'notification-close'});
// This is a bit tricky. St.Bin has its own x-align/y-align properties
// that compete with Clutter's properties. This should be fixed for
// Clutter 2.0. Since St.Bin doesn't define its own setters, the
// setters are a workaround to get Clutter's version.
closeButton.set_x_align(Clutter.ActorAlign.END);
closeButton.set_y_align(Clutter.ActorAlign.START);
// XXX Clutter 2.0 workaround: ClutterBinLayout needs expand
// to respect the alignments.
closeButton.set_x_expand(true);
closeButton.set_y_expand(true);
closeButton.connect('style-changed', function() {
let themeNode = closeButton.get_theme_node();
closeButton.translation_x = themeNode.get_length('-shell-close-overlap-x');
closeButton.translation_y = themeNode.get_length('-shell-close-overlap-y');
});
return closeButton;
}