/* eslint-disable no-multi-spaces */
// ==UserScript==
// @name         GreasyForkScriptUpdate
// @namespace    GreasyForkScriptUpdate
// @version      0.4.2
// @description  Check update for Greasyfork userscript
// @author       PY-DNG
// @match        http*://*/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        GM_xmlhttpRequest
// @grant        unsafeWindow
// ==/UserScript==
(function () {
'use strict';
// Accessable in Global_Scope
typeof(unsafeWindow) !== 'object' && (window.unsafeWindow = window);
unsafeWindow.GreasyForkUpdater = GreasyForkUpdater;
// Use 'new' keyword
function GreasyForkUpdater(metarule=null) {
const GFU = this;
const singles = metarule ? metarule.singles : [];
const multiples = metarule ? metarule.multiples : [];
// Parse '// ==UserScript==\n...\n// ==/UserScript==' to {name: '', namespace: '', version: '', ...}
// Returns metaData object directly
GFU.parseMetaData = function(metaText) {
const metaData = {};
const lines = metaText.split('\n');
const edgeMatcher     = /==\/?UserScript==/i;
const keyValueMatcher = /^\/\/ *@([^@ ]+) +(.+) *$/;
const keyOnlyMatcher  = /^\/\/ *@([^@ ]+) *$/;
for (let line of lines) {
// Get & validate line
line = line.trim();
if (line.match(edgeMatcher)) {continue;};
if (!line.match(keyValueMatcher) && !line.match(keyOnlyMatcher)) {continue;};
// Get key-value
const match = line.match(keyValueMatcher) ? line.match(keyValueMatcher) : line.match(keyOnlyMatcher);
const key = match[1];
const value = match[2] ? match[2] : true;
// Attach to metaData object
if (singles.includes(key)) {
// Single value metaitem: stores only the first value
if (!metaData.hasOwnProperty(key)) {
metaData[key] = value;
}
} else if (multiples.includes(key)) {
// Multiple value metaitem: always stores all values in an array whether provided value are multiple or not
if (!metaData.hasOwnProperty(key)) {
metaData[key] = [value];
} else {
metaData[key].push(value);
}
} else {
// Unspecificed metaitem: stores single-provided values directly and multiple-provided values in arrays
if (!metaData.hasOwnProperty(key)) {
metaData[key] = value;
} else {
if (Array.isArray(metaData[key])) {
metaData[key].push(value);
} else {
metaData[key] = [metaData[key], value];
}
}
}
}
return metaData;
}
// Request latest script meta text from greasyfork
// You'll get metaText string as the first argument in your callback function
GFU.requestMetaText = function(scriptID, callback, args=[]) {
if (!scriptID) {return false;};
const url = 'https://greasyfork.org/scripts/{SID}/code/script.meta.js'.replace('{SID}', String(scriptID));
GM_xmlhttpRequest({
method: 'GET',
url: url,
responseType: 'text',
onload: function(e) {
callback && callback.apply(null, [e.responseText].concat(args));
}
})
}
// Request & parse latest script meta data from greasyfork
// You'll get metaData object as the first argument in your callback function
GFU.getMetaData = function(scriptID, callback, args=[]) {
if (!scriptID) {return false;};
GFU.requestMetaText(scriptID, function(metaText) {
const metaData = GFU.parseMetaData(metaText);
callback && callback.apply(null, [metaData].concat(args));
})
}
// Compare two version texts(v1, v2), returns true if v1 > v2
// Returns null while version text contains Non-demical text period(s)
GFU.versionNewer = function(v1, v2) {
v1 = v1.trim().split('.');
v2 = v2.trim().split('.');
for (let i = 0; i < Math.min(v1.length, v2.length); i++) {
v1[i] = Number(v1[i]);
v2[i] = Number(v2[i]);
if (!v1[i] || !v2[i]) {return null;};
if (v1[i] !== v2[i]) {return v1[i] > v2[i];};
}
return v1.length > v2.length;
}
// Check if there's new version of the script on GreasyFork using scriptID, current version text
// You'll get update(bool), updateurl(string), metaData(object) as the first, second and third argument in your callback function
GFU.checkUpdate = function(scriptID, curver, callback, args=[]) {
if (!scriptID) {return false;};
GFU.getMetaData(scriptID, function(metaData) {
const update = GFU.versionNewer(metaData.version, curver);
const updateurl = 'https://greasyfork.org/scripts/{SID}/code/script.user.js'.replace('{SID}', String(scriptID));
callback && callback.apply(null, [update, updateurl, metaData].concat(args));
})
}
// Check & Install update automatically
GFU.update = function(scriptID, curver) {
GFU.checkUpdate(scriptID, curver, function() {
const url = 'https://greasyfork.org/scripts/{SID}/code/script.user.js'.replace('{SID}', String(scriptID));
location.href = url;
})
}
}
})();