RVM project init script which creates the appropriate .ruby-version .ruby-gemset files

rvm_init.sh

#!/usr/bin/env zsh
# or #!/usr/bin/env bash

function rvm_init(){

    RVM_VERSION=$(echo $MY_RUBY_HOME | awk -F'-' '{print $2}')
    RVM_GEMSET=$(basename $(PWD))

    for i in "$@"
    do
	case $i in
	    -g=*|--gemset=*)
		RVM_GEMSET="${i#*=}"
		;;
	    -r=*|--ruby=*)
		RVM_VERSION="${i#*=}"
		;;
	    *) # unknown option
		;;
	esac
    done

    print Gemset: $RVM_GEMSET
    print Version: $RVM_VERSION

    if ! type rvm > /dev/null 2>&1; then
	print RVM is not installed
	exit 1
    fi
    rvm --create --ruby-version $RVM_VERSION@$RVM_GEMSET
}

Installation

Copy and paste contents of rvm-init.sh into your ~/.zshrc or ~/.bashrc file

Usage

The following reuses the current Ruby version and directory name for the gemset as defaults
$ rvm_init

Custom ruby version and gemset name can be passed
$rvm_init --ruby=2.1.0 --gemset=custom_project