fix: determine git root correctly from sub directories

@commitlint/cli/cli.test.js

@@ -108,7 +108,7 @@ test('should work with husky commitmsg hook', async () => {
 	await rm([HUSKY])();
 });
 
-test.failing('should work with husky commitmsg hook in sub packages', async () => {
+test('should work with husky commitmsg hook in sub packages', async () => {
 	const cwd = HUSKY_INTEGRATION;
 	const upper = path.dirname(HUSKY_INTEGRATION);
 
@@ -123,12 +123,7 @@ test.failing('should work with husky commitmsg hook in sub packages', async () =
 	await npm(['install', 'husky'], {cwd})();
 	await git(['add', 'package.json'], {cwd})();
 
-	try {
-		await git(['commit', '-m', '"chore: this should work"'], {cwd})();
-	} catch (err) {
-		console.log(err.stderr);
-		throw err;
-	}
+	await git(['commit', '-m', '"chore: this should work"'], {cwd})();
 
 	await rm([upper])();
 });

@commitlint/core/package.json

@@ -134,9 +134,9 @@
     "chalk": "^2.0.1",
     "conventional-changelog-angular": "^1.3.3",
     "conventional-commits-parser": "^1.3.0",
+    "find-up": "^2.1.0",
     "franc": "^2.0.0",
     "git-raw-commits": "^1.1.2",
-    "git-toplevel": "^1.1.1",
     "import-from": "^2.1.0",
     "lodash": "^4.17.4",
     "mz": "^2.6.0",

@commitlint/core/src/read.js

@@ -1,7 +1,7 @@
-import {join} from 'path';
+import path from 'path';
 import exists from 'path-exists';
+import up from 'find-up';
 import gitRawCommits from 'git-raw-commits';
-import gitToplevel from 'git-toplevel';
 import {readFile} from 'mz/fs';
 
 export default getCommitMessages;
@@ -45,16 +45,38 @@ function getHistoryCommits(options) {
 // Check if the current repository is shallow
 // () => Promise<Boolean>
 async function isShallow() {
-	const top = await gitToplevel();
-	const shallow = join(top, '.git/shallow');
+	const top = await toplevel();
+
+	if (typeof top !== 'string') {
+		throw new TypeError(`Could not find git root - is this a git repository?`);
+	}
+
+	const shallow = path.join(top, '.git/shallow');
 	return exists(shallow);
 }
 
 // Get recently edited commit message
 // () => Promise<Array<String>>
 async function getEditCommit() {
-	const top = await gitToplevel();
-	const editFilePath = join(top, '.git/COMMIT_EDITMSG');
+	const top = await toplevel();
+
+	if (typeof top !== 'string') {
+		throw new TypeError(`Could not find git root - is this a git repository?`);
+	}
+
+	const editFilePath = path.join(top, '.git/COMMIT_EDITMSG');
 	const editFile = await readFile(editFilePath);
 	return [`${editFile.toString('utf-8')}\n`];
 }
+
+// Find the next git root
+// (start: string) => Promise<string | null>
+async function toplevel(cwd = process.cwd()) {
+	const found = await up('.git', {cwd});
+
+	if (typeof found !== 'string') {
+		return found;
+	}
+
+	return path.join(found, '..');
+}