fix(commit): fix windows by separating add and commit exec (#55)

Windows cmd doesn't support separating commands with ';'. Fix by separating
the execution of the 'git add' and 'git commit' commands. Added separate
test for git add.

Fixes #49

index.js

@@ -121,15 +121,21 @@ function commit (argv, newVersion, cb) {
     args.unshift('package.json')
   }
   checkpoint(msg, args)
-  exec('git add package.json ' + argv.infile + ';git commit ' + verify + (argv.sign ? '-S ' : '') + 'package.json ' + argv.infile + ' -m "' + formatCommitMessage(argv.message, newVersion) + '"', function (err, stdout, stderr) {
-    var errMessage = null
-    if (err) errMessage = err.message
-    if (stderr) errMessage = stderr
+
+  function handleExecError (err, stderr) {
+    // If exec returns an error or content in stderr, log it and exit with return code 1
+    var errMessage = stderr || (err && err.message)
     if (errMessage) {
       console.log(chalk.red(errMessage))
       process.exit(1)
     }
-    return cb()
+  }
+  exec('git add package.json ' + argv.infile, function (err, stdout, stderr) {
+    handleExecError(err, stderr)
+    exec('git commit ' + verify + (argv.sign ? '-S ' : '') + 'package.json ' + argv.infile + ' -m "' + formatCommitMessage(argv.message, newVersion) + '"', function (err, stdout, stderr) {
+      handleExecError(err, stderr)
+      return cb()
+    })
   })
 }
 

test.js

@@ -118,6 +118,20 @@ describe('cli', function () {
         })
     })
 
+    it('exits with error code if git add fails', function () {
+      // mock git by throwing on attempt to add
+      return mockGit('console.error("addition is hard"); process.exit(128);', 'add')
+        .then(function (unmock) {
+          writePackageJson('1.0.0')
+
+          var result = shell.exec(cliPath)
+          result.code.should.equal(1)
+          result.stdout.should.match(/addition is hard/)
+
+          unmock()
+        })
+    })
+
     it('exits with error code if git tag fails', function () {
       // mock git by throwing on attempt to commit
       return mockGit('console.error("tag, you\'re it"); process.exit(128);', 'tag')