// ==UserScript==
// @name         Switch Slack channels.
// @namespace    http://kevinx.net/
// @version      0.2
// @description  Use ALT+PageUp/PageDown to navigate Slack channels.
// @author       Kevin DeLoach
// @match        http://*.slack.com/*
// @match        https://*.slack.com/*
// @run-at       document-end
// @grant        none
// ==/UserScript==
$(function() {
var $channels = $('#channel-list'),
$target = null;
function elAt(i) {
return $($channels.children().get(i));
}
function selectedOrActive() {
var $el = $channels.find('li.channel.underline');
if ($el.size() > 0) {
return $($el.get(0));
}
return $($channels.find('li.channel.active').get(0));
}
function move(dy) {
var $active = selectedOrActive(),
i = $channels.children().index($active),
j = i + dy;
j = Math.max(0, Math.min($channels.children().size() - 1, j));
switchChannel(elAt(j));
}
function switchChannel($el) {
$channels.find('li.channel.underline').removeClass('underline');
$el.addClass('underline');
$target = $el;
}
$(document.body).on('keyup', function(e) {
if (e.shiftKey) {
return;
}
if (e.altKey && e.keyCode === 33) {
move(-1);
} else if (e.altKey && e.keyCode === 34) {
move(1);
} else if ($target) {
$target.find('a').trigger('click');
$target = null;
}
});
});