dotenv but 3 lines of ruby

edit: Thanks to Ben Curtis for inspiring me to cut this from 7 lines to 3.
edit2: More complex regexp to handle multiline vars.

Make an executable file with the following contents:

#!/usr/bin/env ruby

regexp = /^(?<a>\w+)=(?:'(?<b>.+?)'|"\g<b>"|\g<b>)$/m

ENV.update File.read(".env").scan(regexp).to_h if File.exist?(".env")
exec(ENV, *ARGV)

Make an alias. Here is one with bundle exec also included.

alias be="/path/to/executable bundle exec"

Make an .env file.

echo HELLO=WORLD > .env

Run be bash -c 'echo $HELLO'

edit3: this has an added benefit of being language independent over the regular ruby dotenv as this is a shell program and ruby dotenv runs inside your ruby program.

edit4: do the following to have a .gitconfig like transversal up the parent directories.

#!/usr/bin/env ruby

require 'pathname'
env = Pathname.pwd.ascend.map{|x| x.join(".env")}.select(&:exist?).map(&:read).reverse.join

regexp = /^(?<a>\w+)=(?:'(?<b>.+?)'|"\g<b>"|\g<b>)$/m
ENV.update env.scan(regexp).to_h
exec(ENV, *ARGV)