Converting YAML to Environment Variables with Python.md

How to use

Install dependencies

sudo easy_install everyconfig visitor

or

sudo pip install everyconfig visitor

get the sample file

wget https://gist.githubusercontent.com/bcopy/a12c8b5eb01fc606beac4463128a04fd/raw/a7d664a35d17826e6c419ee422505d0872bdb0cb/default.yaml

chmod and Run !

chmod 755 yaml_to_env.py
python yaml_to_env.py .

default.yaml

EDITOR: /usr/bin/nano
PREFIX: /usr/local
CC: gcc
# Sass
SASS_PATH: [~/.sasslib]

# Node.js load paths
NODE_PATH: # using an alternate installation due to problem with Homebrew on Mavericks
  - ~/.node/lib
  - ~/.node/lib/node_modules
# Directories to add to the $LOAD_PATH variable for all Ruby interpreters
RUBYLIB:
  - ~/.rubylib

yaml_to_env.py

#!/usr/bin/env python

##############################
# This script converts an everyconfig YAML fileset into a list of
# environment variables.
# Inspired by https://gist.github.com/SteveBenner/588fff3e54636f3d8297 without the Ruby
# Depends on everyconfig and visitor packages
#

import sys
from visitor import Visitor
from everyconfig import everyconfig

if len(sys.argv) < 2:
    msg = """Usage : yaml_to_env.py <settings folder> [<command prefix="export ">]
    Purpose : convert a given YAML file into a set of environment variables to produce a properties file or shell export directives.

    """
    print msg
    raise RuntimeError("Please provide an input YAML path")

varsYaml = everyconfig(sys.argv[1]) 
if len(sys.argv) > 2:
    cmd_prefix = sys.argv[2]
else:
    cmd_prefix = "export "

if varsYaml is None:
    raise RuntimeError("Could not parse input YAML path")

class EnvEncoder(Visitor):
    def __init__(self):
        self.parentKey = ""
    
    def visit_str(self, node):
        print cmd_prefix+self.parentKey+"="+node
    
    def visit_int(self, node):
        return self.visit(str(node))
    
    def visit_bool(self, node):
        return self.visit(str(node))

    def visit_list(self, node):
        if len(node) > 0:
            baseParentKey = self.parentKey+("" if self.parentKey =="" else "_")
            print cmd_prefix+baseParentKey+"COUNT="+str(len(node))
            for index, item in enumerate(node):
                self.parentKey = baseParentKey+str(index)
                self.visit(item)

    def visit_dict(self, node):
        prevParent = self.parentKey
        for key, value in sorted(node.items()):
            self.parentKey = prevParent+("" if prevParent =="" else "_")+key.upper()
            if type(value) == str:
                print cmd_prefix+self.parentKey+"="+value
            else:
                self.visit(value)
        # Pop the last known key
        self.parentKey = prevParent
       
EnvEncoder().visit(varsYaml)