gnome-shell/js/misc/util.js

// -*- 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;
const Tweener = imports.ui.tweener;

const SCROLL_TIME = 0.1;

// 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 + ')' +
    '(' +
        '(?:' +
            '(?:http|https|ftp)://' +             // 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);
}

// 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;
}

function ensureActorVisibleInScrollView(scrollView, actor) {
    let adjustment = scrollView.vscroll.adjustment;
    let [value, lower, upper, stepIncrement, pageIncrement, pageSize] = adjustment.get_values();

    let offset = 0;
    let vfade = scrollView.get_effect("fade");
    if (vfade)
        offset = vfade.vfade_offset;

    let box = actor.get_allocation_box();
    let y1 = box.y1, y2 = box.y2;

    let parent = actor.get_parent();
    while (parent != scrollView) {
        if (!parent)
            throw new Error("actor not in scroll view");

        let box = parent.get_allocation_box();
        y1 += box.y1;
        y2 += box.y1;
        parent = parent.get_parent();
    }

    if (y1 < value + offset)
        value = Math.max(0, y1 - offset);
    else if (y2 > value + pageSize - offset)
        value = Math.min(upper, y2 + offset - pageSize);
    else
        return;

    Tweener.addTween(adjustment,
                     { value: value,
                       time: SCROLL_TIME,
                       transition: 'easeOutQuad' });
}