/**
 * part of Hachette
 * Facilitate listening to events
 *
 * Copyright (C) 2021 Wojtek Kosior
 * Redistribution terms are gathered in the `copyright' file.
 */

function make()
{
    return new Set();
}

function subscribe(observable, cb)
{
    observable.add(cb);
}

function unsubscribe(observable, cb)
{
    observable.delete(cb);
}

function broadcast(observable, event)
{
    for (const callback of observable)
	callback(event);
}

const observables = {make, subscribe, unsubscribe, broadcast};

/*
 * EXPORTS_START
 * EXPORT observables
 * EXPORTS_END
 */
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<div class='path'>path: <a href='/guix/log/?id=7f2b1c4af0d24f8ce36b1a546d6d853126929551'>root</a>/<a href='/guix/log/gnu?id=7f2b1c4af0d24f8ce36b1a546d6d853126929551'>gnu</a>/<a href='/guix/log/gnu/packages?id=7f2b1c4af0d24f8ce36b1a546d6d853126929551'>packages</a>/<a href='/guix/log/gnu/packages/slang.scm?id=7f2b1c4af0d24f8ce36b1a546d6d853126929551'>slang.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/slang.scm?id=7f2b1c4af0d24f8ce36b1a546d6d853126929551&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-11-07 18:39:19 +0900'>2018-11-07</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=8243f4e55a9f87821370eb2198fa9b5c8eac6648'>gnu: slang: Use a correct location for terminfo dirs.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2018-08-28 01:19:28 +0200'>2018-08-28</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=eb87b634a7723111bdbc84f1971fe64bc96a8963'>gnu: slang: Update to 2.3.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-03-16 09:08:31 -0400'>2018-03-16</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=6cbee49d6668eb7fd738080666f66febfce8c7e8'>gnu: All snippets report errors using exceptions, else return #t.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-02-21 15:02:47 +0100'>2018-02-21</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=61faf24df66bdade0ec780d4a5e5e3d461329341'>gnu: slang: Update to 2.3.1a.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-01-21 20:40:29 +0100'>2018-01-21</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=982dab0ba73a8556bb5ab65bf199efbd1f2b508b'>gnu: newt: Update to 0.52.20.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>