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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 etc. in PickleShare database.
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"""
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from IPython.core import ipapi
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from IPython.core.error import TryNext, UsageError
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ip = ipapi.get()
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import pickleshare
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import inspect,pickle,os,sys,textwrap
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from IPython.core.fakemodule import FakeModule
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def restore_aliases(self):
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ip = self.getapi()
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staliases = ip.db.get('stored_aliases', {})
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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.define_alias(k,v)
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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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db = ip.db
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ip.user_ns['_dh'] = db.get('dhist',[])
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def restore_data(self):
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ip = self.getapi()
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refresh_variables(ip)
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restore_aliases(self)
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restore_dhist(self)
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raise TryNext
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ip.set_hook('late_startup_hook', restore_data)
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def magic_store(self, parameter_s=''):
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"""Lightweight persistence for python variables.
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Example:
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ville@badger[~]|1> A = ['hello',10,'world']\\
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ville@badger[~]|2> %store A\\
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ville@badger[~]|3> Exit
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(IPython session is closed and started again...)
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ville@badger:~$ ipython -p pysh\\
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ville@badger[~]|1> print A
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['hello', 10, 'world']
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Usage:
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%store - Show list of all variables and their current values\\
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%store <var> - Store the *current* value of the variable to disk\\
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%store -d <var> - 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 from store (delete current vals)\\
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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 %stored.
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Also aliases can be %store'd across sessions.
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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(None,1)
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ip = self.getapi()
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db = ip.db
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# delete
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if opts.has_key('d'):
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try:
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todel = args[0]
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except IndexError:
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raise UsageError('You must provide the variable to forget')
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else:
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try:
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del db['autorestore/' + todel]
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except:
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raise UsageError("Can't delete variable '%s'" % todel)
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# reset
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elif opts.has_key('z'):
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for k in db.keys('autorestore/*'):
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del db[k]
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elif opts.has_key('r'):
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refresh_variables(ip)
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# run without arguments -> list variables & values
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elif not args:
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vars = self.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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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,basestring):
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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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fil.close()
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return
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# %store foo
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try:
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obj = ip.user_ns[args[0]]
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except KeyError:
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# it might be an alias
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# This needs to be refactored to use the new AliasManager stuff.
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if args[0] in self.alias_table:
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staliases = db.get('stored_aliases',{})
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staliases[ args[0] ] = self.alias_table[ args[0] ]
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db['stored_aliases'] = staliases
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print "Alias stored:", args[0], self.alias_table[ args[0] ]
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return
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else:
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raise UsageError("Unknown variable '%s'" % args[0])
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else:
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if isinstance(inspect.getmodule(obj), FakeModule):
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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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""" % (args[0], obj) )
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return
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#pickled = pickle.dumps(obj)
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self.db[ 'autorestore/' + args[0] ] = obj
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print "Stored '%s' (%s)" % (args[0], obj.__class__.__name__)
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ip.define_magic('store',magic_store)
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