heroku_envs_to_json.rb

require "json"

skipenvs = %w(
  _
  SHLVL
  PATH
  TERM
  HEROKU_RELEASE_CREATED_AT
  HEROKU_DYNO_ID
  HEROKU_APP_NAME
  DYNO
  GEM_HOME
)

input = $stdin.read
lines = input.split("\n")

envs = {}
lines.each do |line|
  key, value = line.split("=", 2)
  next if skipenvs.include? key
  envs[key] = value
end

puts envs.to_json