how to contribute to ruby

how to contribute to ruby

* https://kirshatrov.com/2020/01/11/contributing-to-mri/
summary 
----
* learn make, autoconf
* docker makes life easy + vscode dev container
 Dockerfile 
```
FROM ubuntu:latest

# tools you need to build MRI
RUN apt-get update && apt-get install -y git ruby autoconf bison gcc make zlib1g-dev libffi-dev libreadline-dev libgdbm-dev libssl-dev build-essential
```
 docker-compose.yml 
```
version: '3'
services:
  dev:
    build:
      dockerfile: Dockerfile
      context: ./
    command: sleep infinity
    volumes:
      - .:/workspace:cached
```

* test
make test-all and make test-all TESTS='test/path/to/test'

* start
https://github.com/ko1/rubyhackchallenge

* flow
```
$ make # build within current directory
$ make install-nodoc # install built files skipping rdoc which takes time
./ruby my-script-to-reproduce.rb # run something on locally built ruby
$ make test-all # run all tests, thought that will take a while
$ make test-all TESTS='test/socket/test_socket.rb' # run socket-related tests

# push to github, let the CI generate more failed tests
# run tests locally again and try to fix it
```

* https://silverhammermba.github.io/emberb/c/