Allowing "file:<path>" --scripts-version values (facebook#3629)

* Allowing for local "file:" prefixed scripts packages * Fixing test failure

Author: GreenGremlin

packages/create-react-app/createReactApp.js

@@ -268,7 +268,7 @@ function run(
  template,
  useYarn
 ) {
- const packageToInstall = getInstallPackage(version);
+ const packageToInstall = getInstallPackage(version, originalDirectory);
  const allDependencies = ['react', 'react-dom', packageToInstall];
 
  console.log('Installing packages. This might take a couple of minutes.');
@@ -365,11 +365,16 @@ function run(
  });
 }
 
-function getInstallPackage(version) {
+function getInstallPackage(version, originalDirectory) {
  let packageToInstall = 'react-scripts';
  const validSemver = semver.valid(version);
  if (validSemver) {
  packageToInstall += `@${validSemver}`;
+ } else if (version && version.match(/^file:/)) {
+ packageToInstall = `file:${path.resolve(
+ originalDirectory,
+ version.match(/^file:(.*)?$/)[1]
+ )}`;
  } else if (version) {
  // for tar.gz or alternative paths
  packageToInstall = version;
@@ -459,6 +464,10 @@ function getPackageName(installPackage) {
  return Promise.resolve(
  installPackage.charAt(0) + installPackage.substr(1).split('@')[0]
  );
+ } else if (installPackage.match(/^file:/)) {
+ const installPackagePath = installPackage.match(/^file:(.*)?$/)[1];
+ const installPackageJson = require(path.join(installPackagePath, 'package.json'));
+ return Promise.resolve(installPackageJson.name);
  }
  return Promise.resolve(installPackage);
 }