add postversion script

https://github.com/mifi/lossless-cut/pull/987#issuecomment-1014246807

package.json

@@ -25,6 +25,7 @@
     "pack-win": "electron-builder --win",
     "prepack-win": "yarn build",
     "postinstall": "patch-package && electron-builder install-app-deps",
+    "version": "node script/postversion.mjs && git add no.mifi.losslesscut.appdata.xml",
     "pack-linux": "electron-builder --linux",
     "prepack-linux": "yarn build",
     "scan-i18n": "i18next-scanner --config i18next-scanner.config.js",

script/postversion.mjs

@@ -0,0 +1,19 @@
+import { readFile, writeFile } from 'fs/promises';
+import { XMLParser, XMLBuilder } from 'fast-xml-parser';
+import moment from 'moment';
+
+const xmlUrl = new URL('../no.mifi.losslesscut.appdata.xml', import.meta.url);
+const xmlData = await readFile(xmlUrl);
+
+const packageJson = JSON.parse(await readFile(new URL('../package.json', import.meta.url)));
+
+const parser = new XMLParser({ alwaysCreateTextNode: true, ignoreAttributes: false, ignoreDeclaration: false });
+const xml = parser.parse(xmlData);
+// console.log(xml);
+
+const { version } = packageJson;
+
+xml.component.releases.release = [{ '@_version': version, '@_date': moment().format('YYYY-MM-DD') }, ...xml.component.releases.release];
+
+const builder = new XMLBuilder({ format: true, ignoreAttributes: false, suppressEmptyNode: true });
+await writeFile(xmlUrl, builder.build(xml));