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