fix: add fallback with husky git params to deprecation handling (#498)

* refactor(cli): rename old husky git params to husky prefix

* fix(cli): add old git params as alias to husky params

Author: byCedric

Diff for: @commitlint/cli/src/cli.js

@@ -224,20 +224,28 @@ function getEditValue(flags) {
 	if (typeof edit === 'boolean') {
 		return edit;
 	}
-	// The recommended method to specify -e with husky was `commitlint -e $GIT_PARAMS`
+	// The recommended method to specify -e with husky was `commitlint -e $HUSKY_GIT_PARAMS`
 	// This does not work properly with win32 systems, where env variable declarations
 	// use a different syntax
 	// See https://github.com/marionebl/commitlint/issues/103 for details
 	// This has been superceded by the `-E GIT_PARAMS` / `-E HUSKY_GIT_PARAMS`
-	if (edit === '$GIT_PARAMS' || edit === '%GIT_PARAMS%') {
+	const isGitParams = edit === '$GIT_PARAMS' || edit === '%GIT_PARAMS%';
+	const isHuskyParams =
+		edit === '$HUSKY_GIT_PARAMS' || edit === '%HUSKY_GIT_PARAMS%';
+
+	if (isGitParams || isHuskyParams) {
 		console.warn(`Using environment variable syntax (${edit}) in -e |\
---edit is deprecated. Use '{-E|--env} GIT_PARAMS instead'`);
-		if (!('GIT_PARAMS' in process.env)) {
-			throw new Error(
-				`Received ${edit} as value for -e | --edit, but GIT_PARAMS is not available globally.`
-			);
+--edit is deprecated. Use '{-E|--env} HUSKY_GIT_PARAMS instead'`);
+
+		if (isGitParams && 'GIT_PARAMS' in process.env) {
+			return process.env.GIT_PARAMS;
+		}
+		if ('HUSKY_GIT_PARAMS' in process.env) {
+			return process.env.HUSKY_GIT_PARAMS;
 		}
-		return process.env.GIT_PARAMS;
+		throw new Error(
+			`Received ${edit} as value for -e | --edit, but GIT_PARAMS or HUSKY_GIT_PARAMS are not available globally.`
+		);
 	}
 	return edit;
 }

Diff for: @commitlint/cli/src/cli.test.js

@@ -127,6 +127,30 @@ test('should work with husky via commitlint -e %GIT_PARAMS%', async () => {
 	await execa('git', ['commit', '-m', '"test: this should work"'], {cwd});
 });
 
+test('should work with husky via commitlint -e $HUSKY_GIT_PARAMS', async () => {
+	const cwd = await git.bootstrap('fixtures/husky/integration');
+	await writePkg(
+		{scripts: {commitmsg: `'${bin}' -e $HUSKY_GIT_PARAMS`}},
+		{cwd}
+	);
+
+	await execa('npm', ['install'], {cwd});
+	await execa('git', ['add', 'package.json'], {cwd});
+	await execa('git', ['commit', '-m', '"test: this should work"'], {cwd});
+});
+
+test('should work with husky via commitlint -e %HUSKY_GIT_PARAMS%', async () => {
+	const cwd = await git.bootstrap('fixtures/husky/integration');
+	await writePkg(
+		{scripts: {commitmsg: `'${bin}' -e %HUSKY_GIT_PARAMS%`}},
+		{cwd}
+	);
+
+	await execa('npm', ['install'], {cwd});
+	await execa('git', ['add', 'package.json'], {cwd});
+	await execa('git', ['commit', '-m', '"test: this should work"'], {cwd});
+});
+
 test('should allow reading of environment variables for edit file, succeeding if valid', async t => {
 	const cwd = await git.bootstrap();
 	await sander.writeFile(cwd, 'commit-msg-file', 'foo');