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# -*- coding: utf-8 -*-
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"""
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%store magic for lightweight persistence.
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Stores variables, aliases and macros in IPython's database.
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To automatically restore stored variables at startup, add this to your
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:file:`ipython_config.py` file::
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c.StoreMagics.autorestore = True
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import inspect, os, sys, textwrap
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from IPython.core.error import UsageError
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from IPython.core.magic import Magics, magics_class, line_magic
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from traitlets import Bool
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def restore_aliases(ip, alias=None):
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staliases = ip.db.get('stored_aliases', {})
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if alias is None:
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for k,v in staliases.items():
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#print "restore alias",k,v # dbg
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#self.alias_table[k] = v
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ip.alias_manager.define_alias(k,v)
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else:
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ip.alias_manager.define_alias(alias, staliases[alias])
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def refresh_variables(ip):
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db = ip.db
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for key in db.keys('autorestore/*'):
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# strip autorestore
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justkey = os.path.basename(key)
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try:
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obj = db[key]
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except KeyError:
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print("Unable to restore variable '%s', ignoring (use %%store -d to forget!)" % justkey)
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print("The error was:", sys.exc_info()[0])
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else:
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#print "restored",justkey,"=",obj #dbg
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ip.user_ns[justkey] = obj
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def restore_dhist(ip):
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ip.user_ns['_dh'] = ip.db.get('dhist',[])
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def restore_data(ip):
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refresh_variables(ip)
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restore_aliases(ip)
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restore_dhist(ip)
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@magics_class
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class StoreMagics(Magics):
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"""Lightweight persistence for python variables.
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Provides the %store magic."""
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autorestore = Bool(False, help=
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"""If True, any %store-d variables will be automatically restored
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when IPython starts.
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"""
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).tag(config=True)
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def __init__(self, shell):
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super(StoreMagics, self).__init__(shell=shell)
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self.shell.configurables.append(self)
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if self.autorestore:
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restore_data(self.shell)
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@line_magic
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def store(self, parameter_s=''):
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"""Lightweight persistence for python variables.
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Example::
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In [1]: l = ['hello',10,'world']
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In [2]: %store l
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In [3]: exit
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(IPython session is closed and started again...)
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ville@badger:~$ ipython
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In [1]: l
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NameError: name 'l' is not defined
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In [2]: %store -r
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In [3]: l
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Out[3]: ['hello', 10, 'world']
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Usage:
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* ``%store`` - Show list of all variables and their current
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values
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* ``%store spam bar`` - Store the *current* value of the variables spam
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and bar to disk
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* ``%store -d spam`` - Remove the variable and its value from storage
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* ``%store -z`` - Remove all variables from storage
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* ``%store -r`` - Refresh all variables, aliases and directory history
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from store (overwrite current vals)
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* ``%store -r spam bar`` - Refresh specified variables and aliases from store
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(delete current val)
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* ``%store foo >a.txt`` - Store value of foo to new file a.txt
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* ``%store foo >>a.txt`` - Append value of foo to file a.txt
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It should be noted that if you change the value of a variable, you
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need to %store it again if you want to persist the new value.
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Note also that the variables will need to be pickleable; most basic
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python types can be safely %store'd.
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Also aliases can be %store'd across sessions.
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To remove an alias from the storage, use the %unalias magic.
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"""
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opts,argsl = self.parse_options(parameter_s,'drz',mode='string')
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args = argsl.split()
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ip = self.shell
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db = ip.db
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# delete
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if 'd' in opts:
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try:
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todel = args[0]
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except IndexError as e:
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raise UsageError('You must provide the variable to forget') from e
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else:
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try:
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del db['autorestore/' + todel]
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except BaseException as e:
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raise UsageError("Can't delete variable '%s'" % todel) from e
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# reset
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elif 'z' in opts:
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for k in db.keys('autorestore/*'):
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del db[k]
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elif 'r' in opts:
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if args:
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for arg in args:
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try:
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obj = db['autorestore/' + arg]
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except KeyError:
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try:
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restore_aliases(ip, alias=arg)
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except KeyError:
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print("no stored variable or alias %s" % arg)
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else:
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ip.user_ns[arg] = obj
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else:
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restore_data(ip)
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# run without arguments -> list variables & values
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elif not args:
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vars = db.keys('autorestore/*')
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vars.sort()
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if vars:
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size = max(map(len, vars))
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else:
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size = 0
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print('Stored variables and their in-db values:')
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fmt = '%-'+str(size)+'s -> %s'
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get = db.get
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for var in vars:
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justkey = os.path.basename(var)
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# print 30 first characters from every var
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print(fmt % (justkey, repr(get(var, '<unavailable>'))[:50]))
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# default action - store the variable
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else:
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# %store foo >file.txt or >>file.txt
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if len(args) > 1 and args[1].startswith('>'):
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fnam = os.path.expanduser(args[1].lstrip('>').lstrip())
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if args[1].startswith('>>'):
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fil = open(fnam, 'a')
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else:
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fil = open(fnam, 'w')
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with fil:
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obj = ip.ev(args[0])
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print("Writing '%s' (%s) to file '%s'." % (args[0],
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obj.__class__.__name__, fnam))
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if not isinstance (obj, str):
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from pprint import pprint
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pprint(obj, fil)
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else:
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fil.write(obj)
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if not obj.endswith('\n'):
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fil.write('\n')
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return
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# %store foo
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for arg in args:
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try:
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obj = ip.user_ns[arg]
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except KeyError:
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# it might be an alias
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name = arg
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try:
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cmd = ip.alias_manager.retrieve_alias(name)
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except ValueError as e:
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raise UsageError("Unknown variable '%s'" % name) from e
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staliases = db.get('stored_aliases',{})
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staliases[name] = cmd
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db['stored_aliases'] = staliases
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print("Alias stored: %s (%s)" % (name, cmd))
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return
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else:
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modname = getattr(inspect.getmodule(obj), '__name__', '')
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if modname == '__main__':
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print(textwrap.dedent("""\
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Warning:%s is %s
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Proper storage of interactively declared classes (or instances
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of those classes) is not possible! Only instances
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of classes in real modules on file system can be %%store'd.
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""" % (arg, obj) ))
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return
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#pickled = pickle.dumps(obj)
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db[ 'autorestore/' + arg ] = obj
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print("Stored '%s' (%s)" % (arg, obj.__class__.__name__))
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def load_ipython_extension(ip):
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"""Load the extension in IPython."""
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ip.register_magics(StoreMagics)
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