setup script to prepare for pre-release vsix (#941)

Signed-off-by: Yan Zhang <[email protected]>

Author: Eskibear

scripts/prepare-nightly-build.js

@@ -0,0 +1,25 @@
+const fs = require("fs");
+
+const json = JSON.parse(fs.readFileSync("./package.json").toString());
+const stableVersion = json.version.match(/(\d+)\.(\d+)\.(\d+)/);
+const major = stableVersion[1];
+const minor = stableVersion[2];
+
+function prependZero(number) {
+    if (number > 99) {
+        throw "Unexpected value to prepend with zero";
+    }
+    return `${number < 10 ? "0" : ""}${number}`;
+}
+
+const date = new Date();
+const month = date.getMonth() + 1;
+const day = date.getDate();
+const hours = date.getHours();
+patch = `${date.getFullYear()}${prependZero(month)}${prependZero(day)}${prependZero(hours)}`;
+
+const insiderPackageJson = Object.assign(json, {
+    version: `${major}.${minor}.${patch}`,
+});
+
+fs.writeFileSync("./package.insiders.json", JSON.stringify(insiderPackageJson));