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