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# -*- coding: utf-8 -*-
""" %env magic command for storing environment variables persistently
"""
from IPython.core import ipapi
from IPython.core.error import TryNext
ip = ipapi.get()
import os,sys
def restore_env(self):
ip = self.getapi()
env = ip.db.get('stored_env', {'set' : {}, 'add' : [], 'pre' : []})
for k,v in env['set'].items():
os.environ[k] = v
for k,v in env['add']:
os.environ[k] = os.environ.get(k,"") + v
for k,v in env['pre']:
os.environ[k] = v + os.environ.get(k,"")
raise TryNext
ip.set_hook('late_startup_hook', restore_env)
def persist_env(self, parameter_s=''):
""" Store environment variables persistently
IPython remembers the values across sessions, which is handy to avoid
editing startup files.
%env - Show all environment variables
%env VISUAL=jed - set VISUAL to jed
%env PATH+=;/foo - append ;foo to PATH
%env PATH+=;/bar - also append ;bar to PATH
%env PATH-=/wbin; - prepend /wbin; to PATH
%env -d VISUAL - forget VISUAL persistent val
%env -p - print all persistent env modifications
"""
if not parameter_s.strip():
return os.environ.data
ip = self.getapi()
db = ip.db
env = ip.db.get('stored_env', {'set' : {}, 'add' : [], 'pre' : []})
if parameter_s.startswith('-p'):
return env
elif parameter_s.startswith('-d'):
parts = (parameter_s.split()[1], '<del>')
else:
parts = parameter_s.strip().split('=')
if len(parts) == 2:
k,v = [p.strip() for p in parts]
if v == '<del>':
if k in env['set']:
del env['set'][k]
env['add'] = [el for el in env['add'] if el[0] != k]
env['pre'] = [el for el in env['pre'] if el[0] != k]
print "Forgot '%s' (for next session)" % k
elif k.endswith('+'):
k = k[:-1]
env['add'].append((k,v))
os.environ[k] += v
print k,"after append =",os.environ[k]
elif k.endswith('-'):
k = k[:-1]
env['pre'].append((k,v))
os.environ[k] = v + os.environ.get(k,"")
print k,"after prepend =",os.environ[k]
else:
env['set'][k] = v
print "Setting",k,"to",v
os.environ[k] = v
db['stored_env'] = env
def env_completer(self,event):
""" Custom completer that lists all env vars """
return os.environ.keys()
ip.define_magic('env', persist_env)
ip.set_hook('complete_command',env_completer, str_key = '%env')
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