├── README.md
└── vm-detector.user.js


/README.md:
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 1 | VM detector
 2 | ---
 3 | 
 4 | Detect installation status for scripts on Violentmonkey.
 5 | 
 6 | This is a userscript to work with Violentmonkey 2.6.4+.
 7 | 
 8 | It changes the label of install button on userscript sites according to version of currently installed script, i.e. if there is an update, the label may be something like `Upgrade to v2.x.x`.
 9 | 
10 | Links:
11 | - GitHub: <https://github.com/violentmonkey/vm-detector>
12 | - Greasyfork: <https://greasyfork.org/scripts/30346-vm-detector>
13 | 
14 | Supported sites:
15 | - <https://greasyfork.org>
16 | 
17 | ### Snapshots
18 | - before using this script:
19 | 
20 |   ![before](https://user-images.githubusercontent.com/3139113/26868463-b051bf64-4b9b-11e7-94d7-6313be7ec259.png)
21 | 
22 | - after using this script:
23 | 
24 |   ![after](https://user-images.githubusercontent.com/3139113/26868474-b8655080-4b9b-11e7-9042-eb6561c57425.png)
25 | 


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/vm-detector.user.js:
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 1 | // ==UserScript==
 2 | // @name VM detector
 3 | // @name:en VM detector
 4 | // @name:zh-CN 暴力猴嗅探器
 5 | // @namespace https://violentmonkey.github.io
 6 | // @description Detector installation status for scripts on Violentmonkey.
 7 | // @description:en Detector installation status for scripts on Violentmonkey.
 8 | // @description:zh-CN 检测脚本在暴力猴上的安装状态。
 9 | // @version 1.0.1
10 | // @author Gerald <i@gerald.top>
11 | // @match https://greasyfork.org/*
12 | // @grant none
13 | // ==/UserScript==
14 | 
15 | initialize();
16 | 
17 | function initialize() {
18 |   if (!check()) return;
19 | 
20 |   const $ = selector => document.querySelector(selector);
21 |   const button = $('.install-link');
22 |   if (!button) return;
23 | 
24 |   const name = button.dataset.scriptName;
25 |   const namespace = button.dataset.scriptNamespace;
26 |   const version = button.dataset.scriptVersion;
27 |   external.Violentmonkey.isInstalled(name, namespace)
28 |   .then(result => {
29 |     if (result) {
30 |       const compare = compareVersions(result, version);
31 |       if (compare < 0) {
32 |         button.textContent = button.dataset.updateLabel;
33 |       } else if (compare > 0) {
34 |         button.textContent = button.dataset.downgradeLabel;
35 |       } else {
36 |         button.textContent = button.dataset.reinstallLabel;
37 |       }
38 |     }
39 |   });
40 | }
41 | 
42 | function check() {
43 |   const warn = message => {
44 |     console.warn('[VM detector]', message);
45 |   };
46 |   if (GM_info.scriptHandler !== 'Violentmonkey') {
47 |     warn('This script only works for Violentmonkey.');
48 |     return false;
49 |   }
50 |   if (!external.Violentmonkey) {
51 |     warn('This script requires Violentmonkey 2.6.4+.');
52 |     return false;
53 |   }
54 |   return true;
55 | }
56 | 
57 | function compareVersions(a, b) {
58 |   const va = a.split('.').map(i => +i);
59 |   const vb = b.split('.').map(i => +i);
60 |   for (let i = 0; i < va.length || i < vb.length; i++) {
61 |     const ua = va[i];
62 |     const ub = vb[i];
63 |     if ((ua || ub) && (ua !== ub)) {
64 |       return ua && (!ub || ua > ub) ? 1 : -1;
65 |     }
66 |   }
67 |   return 0;
68 | }
69 | 


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