added version check to pre-push script (#170)

When pushing, a script checks that the version in package.json and and the tag are in accordance

Author: janikwitzig

.husky/pre-commit

@@ -1,6 +1,6 @@
 lint-staged
-
 #!/bin/sh
+
 # Husky pre-commit hook to update companion/HELP.md with all action names and descriptions
 node scripts/update-actions-md.js
 git add companion/HELP.md

.husky/pre-push

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+node scripts/check-tag.js

scripts/check-tag.js

@@ -0,0 +1,42 @@
+import { execSync } from 'child_process'
+import * as fs from 'fs'
+
+function run(cmd) {
+	try {
+		return execSync(cmd, { stdio: ['ignore', 'pipe', 'ignore'] })
+			.toString()
+			.trim()
+	} catch {
+		return null
+	}
+}
+
+if (!fs.existsSync('package.json')) {
+	throw new Error('package.json not found')
+}
+
+const tag = run('git describe --tags --abbrev=0')
+
+if (!tag) {
+	throw new Error('No git tag found on this branch')
+}
+
+if (!/^v\d+(\.\d+){2,3}$/.test(tag)) {
+	throw new Error(`Latest tag '${tag}' does not match vX.Y.Z or vX.Y.Z.W`)
+}
+
+let pkg
+try {
+	pkg = JSON.parse(fs.readFileSync('package.json', 'utf8'))
+} catch {
+	throw new Error('Cannot parse package.json')
+}
+
+const pkgVersion = pkg.version
+const tagVersion = tag.slice(1)
+
+if (pkgVersion !== tagVersion) {
+	throw new Error(`ERROR: package.json version (${pkgVersion}) does not match git tag (${tag})`)
+}
+
+console.log(`Git tag '${tag}' matches package.json version '${pkgVersion}'`)