Fix initiating a project within the current directory

[seanyusa]

This PR is intended to address #203. Reading through the code, it seems like this functionality was intended to be supported and seemed like a simple fix so I thought I'd give it a go!

Before:

The installation would successfully create all template project files but fail on

process.chdir(relativeProjectDir);

Thus not completing the git init step and failing to print out success instructions.

Output

>>> TURBOREPO

>>> Welcome to Turborepo! Let's get you set up with a new codebase.

? Where would you like to create your turborepo? .
? Which package manager do you want to use? Yarn
? Do you want me to run `yarn install`? Yes

>>> Bootstrapping a new turborepo with the following:

 - apps/web: Next.js with TypeScript
 - apps/docs: Next.js with TypeScript
 - packages/ui: Shared React component library
 - packages/config: Shared configuration (ESLint)
 - packages/tsconfig: Shared TypeScript `tsconfig.json`


Aborting installation.
Unexpected error. Please report it as a bug:
Error: ENOENT: no such file or directory, chdir '/Users/sean/development/test-dir' -> ''
    at process.wrappedChdir (internal/bootstrap/switches/does_own_process_state.js:116:14)
    at process.chdir (/Users/sean/development/turborepo/node_modules/graceful-fs/polyfills.js:22:11)
    at run (/Users/sean/development/turborepo/create-turbo/dist/index.js:277:11)
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'chdir',
  path: '/Users/sean/development/test-dir',
  dest: ''
}

% ls -al
total 288
Dec 12 12:20 .
Dec 12 12:14 ..
Dec 12 12:20 .gitignore
Dec 12 12:20 README.md
Dec 12 12:20 apps
Dec 12 12:20 node_modules
Dec 12 12:20 package.json
Dec 12 12:20 packages
Dec 12 12:20 yarn.lock

After:

Changes dir correctly for current directory by directly using projectDir. in preparation for the tryGitInit call.

Output

>>> TURBOREPO

>>> Welcome to Turborepo! Let's get you set up with a new codebase.

? Where would you like to create your turborepo? .
? Which package manager do you want to use? Yarn
? Do you want me to run `yarn install`? Yes

>>> Bootstrapping a new turborepo with the following:

 - apps/web: Next.js with TypeScript
 - apps/docs: Next.js with TypeScript
 - packages/ui: Shared React component library
 - packages/config: Shared configuration (ESLint)
 - packages/tsconfig: Shared TypeScript `tsconfig.json`

>>> Success! Check the README for development and deploy instructions!

% ls -al
total 288
Dec 12 12:32 .
Dec 12 12:31 ..
Dec 12 12:32 .git
Dec 12 12:32 .gitignore
Dec 12 12:32 README.md
Dec 12 12:32 apps
Dec 12 12:32 node_modules
Dec 12 12:32 package.json
Dec 12 12:32 packages
Dec 12 12:32 yarn.lock

Testing

Can manually test by running create-turbo using . as the project directory.

I wasn't able to run the jest tests as is (Jest encountered an unexpected token), didn't have too much time to see what was required to make things work. Should the tests be working right now?

Further Improvements

• Adding a test for current directory support at some point would be nice.
• Seems like the message for creating a project within a current directory simply says the following at the moment: (Success! Check the README for development and deploy instructions!) Can improve this output to produce similar instructions to those that are shown when not using the current directory. (Your new Turborepo is ready. To build all apps and packages, run the following...)

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