refactor: resolveGitDir uses execGit

src/execGit.js

@@ -0,0 +1,23 @@
+'use strict'
+
+const debug = require('debug')('lint-staged:git')
+const execa = require('execa')
+const path = require('path')
+
+function getAbsolutePath(dir) {
+  return path.isAbsolute(dir) ? dir : path.resolve(dir)
+}
+
+module.exports = async function execGit(cmd, options = {}) {
+  const cwd = options.cwd || process.cwd()
+  debug('Running git command', cmd)
+  try {
+    const { stdout } = await execa('git', [].concat(cmd), {
+      ...options,
+      cwd: getAbsolutePath(cwd)
+    })
+    return stdout
+  } catch (err) {
+    throw new Error(err)
+  }
+}

src/gitWorkflow.js

@@ -1,33 +1,15 @@
 'use strict'
 
-const path = require('path')
-const execa = require('execa')
 const gStatus = require('g-status')
 const del = require('del')
 const debug = require('debug')('lint-staged:git')
 
+const execGit = require('./execGit')
+
 let workingCopyTree = null
 let indexTree = null
 let formattedIndexTree = null
 
-function getAbsolutePath(dir) {
-  return path.isAbsolute(dir) ? dir : path.resolve(dir)
-}
-
-async function execGit(cmd, options) {
-  const { cwd } = options
-  debug('Running git command', cmd)
-  try {
-    const { stdout } = await execa('git', [].concat(cmd), {
-      ...options,
-      cwd: getAbsolutePath(cwd)
-    })
-    return stdout
-  } catch (err) {
-    throw new Error(err)
-  }
-}
-
 async function writeTree(options) {
   return execGit(['write-tree'], options)
 }

src/resolveGitDir.js

@@ -1,7 +1,14 @@
 'use strict'
 
-const execa = require('execa')
+const execGit = require('./execGit')
+const printErrors = require('./printErrors')
 
 module.exports = async function resolveGitDir() {
-  return (await execa('git', ['rev-parse', '--show-toplevel'])).stdout
+  try {
+    const gitDir = await execGit(['rev-parse', '--show-toplevel'])
+    return gitDir
+  } catch (error) {
+    printErrors(error)
+    return null
+  }
 }