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|
"""Implementation of magic functions for interaction with the OS.
|
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|
|
|
|
Note: this module is named 'osm' instead of 'os' to avoid a collision with the
|
|
|
builtin.
|
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|
"""
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|
#-----------------------------------------------------------------------------
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|
# Copyright (c) 2012 The IPython Development Team.
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|
|
#
|
|
|
# Distributed under the terms of the Modified BSD License.
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|
#
|
|
|
# The full license is in the file COPYING.txt, distributed with this software.
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|
|
#-----------------------------------------------------------------------------
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|
#-----------------------------------------------------------------------------
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|
|
# Imports
|
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|
#-----------------------------------------------------------------------------
|
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|
|
|
# Stdlib
|
|
|
import io
|
|
|
import os
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|
|
import re
|
|
|
import sys
|
|
|
from pprint import pformat
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|
|
|
|
|
# Our own packages
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|
|
from IPython.core import magic_arguments
|
|
|
from IPython.core import oinspect
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|
from IPython.core import page
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|
|
from IPython.core.error import UsageError
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|
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from IPython.core.magic import (
|
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|
Magics, compress_dhist, magics_class, line_magic, cell_magic, line_cell_magic
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|
)
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|
from IPython.testing.skipdoctest import skip_doctest
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|
from IPython.utils.openpy import source_to_unicode
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|
from IPython.utils.path import unquote_filename
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from IPython.utils.process import abbrev_cwd
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from IPython.utils.terminal import set_term_title
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#-----------------------------------------------------------------------------
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# Magic implementation classes
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|
#-----------------------------------------------------------------------------
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@magics_class
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class OSMagics(Magics):
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"""Magics to interact with the underlying OS (shell-type functionality).
|
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|
"""
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@skip_doctest
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|
@line_magic
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|
|
def alias(self, parameter_s=''):
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|
"""Define an alias for a system command.
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|
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|
'%alias alias_name cmd' defines 'alias_name' as an alias for 'cmd'
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|
|
|
|
Then, typing 'alias_name params' will execute the system command 'cmd
|
|
|
params' (from your underlying operating system).
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|
|
|
|
Aliases have lower precedence than magic functions and Python normal
|
|
|
variables, so if 'foo' is both a Python variable and an alias, the
|
|
|
alias can not be executed until 'del foo' removes the Python variable.
|
|
|
|
|
|
You can use the %l specifier in an alias definition to represent the
|
|
|
whole line when the alias is called. For example::
|
|
|
|
|
|
In [2]: alias bracket echo "Input in brackets: <%l>"
|
|
|
In [3]: bracket hello world
|
|
|
Input in brackets: <hello world>
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|
|
|
|
|
You can also define aliases with parameters using %s specifiers (one
|
|
|
per parameter)::
|
|
|
|
|
|
In [1]: alias parts echo first %s second %s
|
|
|
In [2]: %parts A B
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|
|
first A second B
|
|
|
In [3]: %parts A
|
|
|
Incorrect number of arguments: 2 expected.
|
|
|
parts is an alias to: 'echo first %s second %s'
|
|
|
|
|
|
Note that %l and %s are mutually exclusive. You can only use one or
|
|
|
the other in your aliases.
|
|
|
|
|
|
Aliases expand Python variables just like system calls using ! or !!
|
|
|
do: all expressions prefixed with '$' get expanded. For details of
|
|
|
the semantic rules, see PEP-215:
|
|
|
http://www.python.org/peps/pep-0215.html. This is the library used by
|
|
|
IPython for variable expansion. If you want to access a true shell
|
|
|
variable, an extra $ is necessary to prevent its expansion by
|
|
|
IPython::
|
|
|
|
|
|
In [6]: alias show echo
|
|
|
In [7]: PATH='A Python string'
|
|
|
In [8]: show $PATH
|
|
|
A Python string
|
|
|
In [9]: show $$PATH
|
|
|
/usr/local/lf9560/bin:/usr/local/intel/compiler70/ia32/bin:...
|
|
|
|
|
|
You can use the alias facility to acess all of $PATH. See the %rehash
|
|
|
and %rehashx functions, which automatically create aliases for the
|
|
|
contents of your $PATH.
|
|
|
|
|
|
If called with no parameters, %alias prints the current alias table."""
|
|
|
|
|
|
par = parameter_s.strip()
|
|
|
if not par:
|
|
|
aliases = sorted(self.shell.alias_manager.aliases)
|
|
|
# stored = self.shell.db.get('stored_aliases', {} )
|
|
|
# for k, v in stored:
|
|
|
# atab.append(k, v[0])
|
|
|
|
|
|
print "Total number of aliases:", len(aliases)
|
|
|
sys.stdout.flush()
|
|
|
return aliases
|
|
|
|
|
|
# Now try to define a new one
|
|
|
try:
|
|
|
alias,cmd = par.split(None, 1)
|
|
|
except:
|
|
|
print oinspect.getdoc(self.alias)
|
|
|
else:
|
|
|
self.shell.alias_manager.soft_define_alias(alias, cmd)
|
|
|
# end magic_alias
|
|
|
|
|
|
@line_magic
|
|
|
def unalias(self, parameter_s=''):
|
|
|
"""Remove an alias"""
|
|
|
|
|
|
aname = parameter_s.strip()
|
|
|
self.shell.alias_manager.undefine_alias(aname)
|
|
|
stored = self.shell.db.get('stored_aliases', {} )
|
|
|
if aname in stored:
|
|
|
print "Removing %stored alias",aname
|
|
|
del stored[aname]
|
|
|
self.shell.db['stored_aliases'] = stored
|
|
|
|
|
|
@line_magic
|
|
|
def rehashx(self, parameter_s=''):
|
|
|
"""Update the alias table with all executable files in $PATH.
|
|
|
|
|
|
This version explicitly checks that every entry in $PATH is a file
|
|
|
with execute access (os.X_OK), so it is much slower than %rehash.
|
|
|
|
|
|
Under Windows, it checks executability as a match against a
|
|
|
'|'-separated string of extensions, stored in the IPython config
|
|
|
variable win_exec_ext. This defaults to 'exe|com|bat'.
|
|
|
|
|
|
This function also resets the root module cache of module completer,
|
|
|
used on slow filesystems.
|
|
|
"""
|
|
|
from IPython.core.alias import InvalidAliasError
|
|
|
|
|
|
# for the benefit of module completer in ipy_completers.py
|
|
|
del self.shell.db['rootmodules_cache']
|
|
|
|
|
|
path = [os.path.abspath(os.path.expanduser(p)) for p in
|
|
|
os.environ.get('PATH','').split(os.pathsep)]
|
|
|
path = filter(os.path.isdir,path)
|
|
|
|
|
|
syscmdlist = []
|
|
|
# Now define isexec in a cross platform manner.
|
|
|
if os.name == 'posix':
|
|
|
isexec = lambda fname:os.path.isfile(fname) and \
|
|
|
os.access(fname,os.X_OK)
|
|
|
else:
|
|
|
try:
|
|
|
winext = os.environ['pathext'].replace(';','|').replace('.','')
|
|
|
except KeyError:
|
|
|
winext = 'exe|com|bat|py'
|
|
|
if 'py' not in winext:
|
|
|
winext += '|py'
|
|
|
execre = re.compile(r'(.*)\.(%s)$' % winext,re.IGNORECASE)
|
|
|
isexec = lambda fname:os.path.isfile(fname) and execre.match(fname)
|
|
|
savedir = os.getcwdu()
|
|
|
|
|
|
# Now walk the paths looking for executables to alias.
|
|
|
try:
|
|
|
# write the whole loop for posix/Windows so we don't have an if in
|
|
|
# the innermost part
|
|
|
if os.name == 'posix':
|
|
|
for pdir in path:
|
|
|
os.chdir(pdir)
|
|
|
for ff in os.listdir(pdir):
|
|
|
if isexec(ff):
|
|
|
try:
|
|
|
# Removes dots from the name since ipython
|
|
|
# will assume names with dots to be python.
|
|
|
if ff not in self.shell.alias_manager:
|
|
|
self.shell.alias_manager.define_alias(
|
|
|
ff.replace('.',''), ff)
|
|
|
except InvalidAliasError:
|
|
|
pass
|
|
|
else:
|
|
|
syscmdlist.append(ff)
|
|
|
else:
|
|
|
no_alias = self.shell.alias_manager.no_alias
|
|
|
for pdir in path:
|
|
|
os.chdir(pdir)
|
|
|
for ff in os.listdir(pdir):
|
|
|
base, ext = os.path.splitext(ff)
|
|
|
if isexec(ff) and base.lower() not in no_alias:
|
|
|
if ext.lower() == '.exe':
|
|
|
ff = base
|
|
|
try:
|
|
|
# Removes dots from the name since ipython
|
|
|
# will assume names with dots to be python.
|
|
|
self.shell.alias_manager.define_alias(
|
|
|
base.lower().replace('.',''), ff)
|
|
|
except InvalidAliasError:
|
|
|
pass
|
|
|
syscmdlist.append(ff)
|
|
|
self.shell.db['syscmdlist'] = syscmdlist
|
|
|
finally:
|
|
|
os.chdir(savedir)
|
|
|
|
|
|
@skip_doctest
|
|
|
@line_magic
|
|
|
def pwd(self, parameter_s=''):
|
|
|
"""Return the current working directory path.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
::
|
|
|
|
|
|
In [9]: pwd
|
|
|
Out[9]: '/home/tsuser/sprint/ipython'
|
|
|
"""
|
|
|
return os.getcwdu()
|
|
|
|
|
|
@skip_doctest
|
|
|
@line_magic
|
|
|
def cd(self, parameter_s=''):
|
|
|
"""Change the current working directory.
|
|
|
|
|
|
This command automatically maintains an internal list of directories
|
|
|
you visit during your IPython session, in the variable _dh. The
|
|
|
command %dhist shows this history nicely formatted. You can also
|
|
|
do 'cd -<tab>' to see directory history conveniently.
|
|
|
|
|
|
Usage:
|
|
|
|
|
|
cd 'dir': changes to directory 'dir'.
|
|
|
|
|
|
cd -: changes to the last visited directory.
|
|
|
|
|
|
cd -<n>: changes to the n-th directory in the directory history.
|
|
|
|
|
|
cd --foo: change to directory that matches 'foo' in history
|
|
|
|
|
|
cd -b <bookmark_name>: jump to a bookmark set by %bookmark
|
|
|
(note: cd <bookmark_name> is enough if there is no
|
|
|
directory <bookmark_name>, but a bookmark with the name exists.)
|
|
|
'cd -b <tab>' allows you to tab-complete bookmark names.
|
|
|
|
|
|
Options:
|
|
|
|
|
|
-q: quiet. Do not print the working directory after the cd command is
|
|
|
executed. By default IPython's cd command does print this directory,
|
|
|
since the default prompts do not display path information.
|
|
|
|
|
|
Note that !cd doesn't work for this purpose because the shell where
|
|
|
!command runs is immediately discarded after executing 'command'.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
::
|
|
|
|
|
|
In [10]: cd parent/child
|
|
|
/home/tsuser/parent/child
|
|
|
"""
|
|
|
|
|
|
oldcwd = os.getcwdu()
|
|
|
numcd = re.match(r'(-)(\d+)$',parameter_s)
|
|
|
# jump in directory history by number
|
|
|
if numcd:
|
|
|
nn = int(numcd.group(2))
|
|
|
try:
|
|
|
ps = self.shell.user_ns['_dh'][nn]
|
|
|
except IndexError:
|
|
|
print 'The requested directory does not exist in history.'
|
|
|
return
|
|
|
else:
|
|
|
opts = {}
|
|
|
elif parameter_s.startswith('--'):
|
|
|
ps = None
|
|
|
fallback = None
|
|
|
pat = parameter_s[2:]
|
|
|
dh = self.shell.user_ns['_dh']
|
|
|
# first search only by basename (last component)
|
|
|
for ent in reversed(dh):
|
|
|
if pat in os.path.basename(ent) and os.path.isdir(ent):
|
|
|
ps = ent
|
|
|
break
|
|
|
|
|
|
if fallback is None and pat in ent and os.path.isdir(ent):
|
|
|
fallback = ent
|
|
|
|
|
|
# if we have no last part match, pick the first full path match
|
|
|
if ps is None:
|
|
|
ps = fallback
|
|
|
|
|
|
if ps is None:
|
|
|
print "No matching entry in directory history"
|
|
|
return
|
|
|
else:
|
|
|
opts = {}
|
|
|
|
|
|
|
|
|
else:
|
|
|
#turn all non-space-escaping backslashes to slashes,
|
|
|
# for c:\windows\directory\names\
|
|
|
parameter_s = re.sub(r'\\(?! )','/', parameter_s)
|
|
|
opts,ps = self.parse_options(parameter_s,'qb',mode='string')
|
|
|
# jump to previous
|
|
|
if ps == '-':
|
|
|
try:
|
|
|
ps = self.shell.user_ns['_dh'][-2]
|
|
|
except IndexError:
|
|
|
raise UsageError('%cd -: No previous directory to change to.')
|
|
|
# jump to bookmark if needed
|
|
|
else:
|
|
|
if not os.path.isdir(ps) or 'b' in opts:
|
|
|
bkms = self.shell.db.get('bookmarks', {})
|
|
|
|
|
|
if ps in bkms:
|
|
|
target = bkms[ps]
|
|
|
print '(bookmark:%s) -> %s' % (ps, target)
|
|
|
ps = target
|
|
|
else:
|
|
|
if 'b' in opts:
|
|
|
raise UsageError("Bookmark '%s' not found. "
|
|
|
"Use '%%bookmark -l' to see your bookmarks." % ps)
|
|
|
|
|
|
# strip extra quotes on Windows, because os.chdir doesn't like them
|
|
|
ps = unquote_filename(ps)
|
|
|
# at this point ps should point to the target dir
|
|
|
if ps:
|
|
|
try:
|
|
|
os.chdir(os.path.expanduser(ps))
|
|
|
if hasattr(self.shell, 'term_title') and self.shell.term_title:
|
|
|
set_term_title('IPython: ' + abbrev_cwd())
|
|
|
except OSError:
|
|
|
print sys.exc_info()[1]
|
|
|
else:
|
|
|
cwd = os.getcwdu()
|
|
|
dhist = self.shell.user_ns['_dh']
|
|
|
if oldcwd != cwd:
|
|
|
dhist.append(cwd)
|
|
|
self.shell.db['dhist'] = compress_dhist(dhist)[-100:]
|
|
|
|
|
|
else:
|
|
|
os.chdir(self.shell.home_dir)
|
|
|
if hasattr(self.shell, 'term_title') and self.shell.term_title:
|
|
|
set_term_title('IPython: ' + '~')
|
|
|
cwd = os.getcwdu()
|
|
|
dhist = self.shell.user_ns['_dh']
|
|
|
|
|
|
if oldcwd != cwd:
|
|
|
dhist.append(cwd)
|
|
|
self.shell.db['dhist'] = compress_dhist(dhist)[-100:]
|
|
|
if not 'q' in opts and self.shell.user_ns['_dh']:
|
|
|
print self.shell.user_ns['_dh'][-1]
|
|
|
|
|
|
|
|
|
@line_magic
|
|
|
def env(self, parameter_s=''):
|
|
|
"""List environment variables."""
|
|
|
|
|
|
return dict(os.environ)
|
|
|
|
|
|
@line_magic
|
|
|
def pushd(self, parameter_s=''):
|
|
|
"""Place the current dir on stack and change directory.
|
|
|
|
|
|
Usage:\\
|
|
|
%pushd ['dirname']
|
|
|
"""
|
|
|
|
|
|
dir_s = self.shell.dir_stack
|
|
|
tgt = os.path.expanduser(unquote_filename(parameter_s))
|
|
|
cwd = os.getcwdu().replace(self.shell.home_dir,'~')
|
|
|
if tgt:
|
|
|
self.cd(parameter_s)
|
|
|
dir_s.insert(0,cwd)
|
|
|
return self.shell.magic('dirs')
|
|
|
|
|
|
@line_magic
|
|
|
def popd(self, parameter_s=''):
|
|
|
"""Change to directory popped off the top of the stack.
|
|
|
"""
|
|
|
if not self.shell.dir_stack:
|
|
|
raise UsageError("%popd on empty stack")
|
|
|
top = self.shell.dir_stack.pop(0)
|
|
|
self.cd(top)
|
|
|
print "popd ->",top
|
|
|
|
|
|
@line_magic
|
|
|
def dirs(self, parameter_s=''):
|
|
|
"""Return the current directory stack."""
|
|
|
|
|
|
return self.shell.dir_stack
|
|
|
|
|
|
@line_magic
|
|
|
def dhist(self, parameter_s=''):
|
|
|
"""Print your history of visited directories.
|
|
|
|
|
|
%dhist -> print full history\\
|
|
|
%dhist n -> print last n entries only\\
|
|
|
%dhist n1 n2 -> print entries between n1 and n2 (n2 not included)\\
|
|
|
|
|
|
This history is automatically maintained by the %cd command, and
|
|
|
always available as the global list variable _dh. You can use %cd -<n>
|
|
|
to go to directory number <n>.
|
|
|
|
|
|
Note that most of time, you should view directory history by entering
|
|
|
cd -<TAB>.
|
|
|
|
|
|
"""
|
|
|
|
|
|
dh = self.shell.user_ns['_dh']
|
|
|
if parameter_s:
|
|
|
try:
|
|
|
args = map(int,parameter_s.split())
|
|
|
except:
|
|
|
self.arg_err(self.dhist)
|
|
|
return
|
|
|
if len(args) == 1:
|
|
|
ini,fin = max(len(dh)-(args[0]),0),len(dh)
|
|
|
elif len(args) == 2:
|
|
|
ini,fin = args
|
|
|
fin = min(fin, len(dh))
|
|
|
else:
|
|
|
self.arg_err(self.dhist)
|
|
|
return
|
|
|
else:
|
|
|
ini,fin = 0,len(dh)
|
|
|
print 'Directory history (kept in _dh)'
|
|
|
for i in range(ini, fin):
|
|
|
print "%d: %s" % (i, dh[i])
|
|
|
|
|
|
@skip_doctest
|
|
|
@line_magic
|
|
|
def sc(self, parameter_s=''):
|
|
|
"""Shell capture - run shell command and capture output (DEPRECATED use !).
|
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DEPRECATED. Suboptimal, retained for backwards compatibility.
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You should use the form 'var = !command' instead. Example:
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"%sc -l myfiles = ls ~" should now be written as
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"myfiles = !ls ~"
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myfiles.s, myfiles.l and myfiles.n still apply as documented
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below.
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--
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%sc [options] varname=command
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IPython will run the given command using commands.getoutput(), and
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will then update the user's interactive namespace with a variable
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called varname, containing the value of the call. Your command can
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contain shell wildcards, pipes, etc.
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The '=' sign in the syntax is mandatory, and the variable name you
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supply must follow Python's standard conventions for valid names.
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(A special format without variable name exists for internal use)
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Options:
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-l: list output. Split the output on newlines into a list before
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assigning it to the given variable. By default the output is stored
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as a single string.
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-v: verbose. Print the contents of the variable.
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In most cases you should not need to split as a list, because the
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returned value is a special type of string which can automatically
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provide its contents either as a list (split on newlines) or as a
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space-separated string. These are convenient, respectively, either
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for sequential processing or to be passed to a shell command.
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For example::
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# Capture into variable a
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In [1]: sc a=ls *py
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# a is a string with embedded newlines
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In [2]: a
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Out[2]: 'setup.py\\nwin32_manual_post_install.py'
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# which can be seen as a list:
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In [3]: a.l
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Out[3]: ['setup.py', 'win32_manual_post_install.py']
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# or as a whitespace-separated string:
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In [4]: a.s
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Out[4]: 'setup.py win32_manual_post_install.py'
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# a.s is useful to pass as a single command line:
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In [5]: !wc -l $a.s
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146 setup.py
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130 win32_manual_post_install.py
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276 total
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# while the list form is useful to loop over:
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In [6]: for f in a.l:
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...: !wc -l $f
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...:
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146 setup.py
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130 win32_manual_post_install.py
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Similarly, the lists returned by the -l option are also special, in
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the sense that you can equally invoke the .s attribute on them to
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automatically get a whitespace-separated string from their contents::
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In [7]: sc -l b=ls *py
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In [8]: b
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Out[8]: ['setup.py', 'win32_manual_post_install.py']
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In [9]: b.s
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Out[9]: 'setup.py win32_manual_post_install.py'
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In summary, both the lists and strings used for output capture have
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the following special attributes::
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.l (or .list) : value as list.
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.n (or .nlstr): value as newline-separated string.
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.s (or .spstr): value as space-separated string.
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"""
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opts,args = self.parse_options(parameter_s, 'lv')
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# Try to get a variable name and command to run
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try:
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# the variable name must be obtained from the parse_options
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# output, which uses shlex.split to strip options out.
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var,_ = args.split('=', 1)
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var = var.strip()
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# But the command has to be extracted from the original input
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# parameter_s, not on what parse_options returns, to avoid the
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# quote stripping which shlex.split performs on it.
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_,cmd = parameter_s.split('=', 1)
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except ValueError:
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var,cmd = '',''
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# If all looks ok, proceed
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split = 'l' in opts
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out = self.shell.getoutput(cmd, split=split)
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if 'v' in opts:
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print '%s ==\n%s' % (var, pformat(out))
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if var:
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self.shell.user_ns.update({var:out})
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else:
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return out
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@line_cell_magic
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def sx(self, line='', cell=None):
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"""Shell execute - run shell command and capture output (!! is short-hand).
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%sx command
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IPython will run the given command using commands.getoutput(), and
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return the result formatted as a list (split on '\\n'). Since the
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output is _returned_, it will be stored in ipython's regular output
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cache Out[N] and in the '_N' automatic variables.
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Notes:
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1) If an input line begins with '!!', then %sx is automatically
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invoked. That is, while::
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!ls
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causes ipython to simply issue system('ls'), typing::
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!!ls
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is a shorthand equivalent to::
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%sx ls
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2) %sx differs from %sc in that %sx automatically splits into a list,
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like '%sc -l'. The reason for this is to make it as easy as possible
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to process line-oriented shell output via further python commands.
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%sc is meant to provide much finer control, but requires more
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typing.
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3) Just like %sc -l, this is a list with special attributes:
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::
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.l (or .list) : value as list.
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.n (or .nlstr): value as newline-separated string.
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.s (or .spstr): value as whitespace-separated string.
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This is very useful when trying to use such lists as arguments to
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system commands."""
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if cell is None:
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# line magic
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return self.shell.getoutput(line)
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else:
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opts,args = self.parse_options(line, '', 'out=')
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output = self.shell.getoutput(cell)
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out_name = opts.get('out', opts.get('o'))
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if out_name:
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self.shell.user_ns[out_name] = output
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else:
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return output
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system = line_cell_magic('system')(sx)
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bang = cell_magic('!')(sx)
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@line_magic
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def bookmark(self, parameter_s=''):
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"""Manage IPython's bookmark system.
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%bookmark <name> - set bookmark to current dir
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%bookmark <name> <dir> - set bookmark to <dir>
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%bookmark -l - list all bookmarks
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%bookmark -d <name> - remove bookmark
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%bookmark -r - remove all bookmarks
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You can later on access a bookmarked folder with::
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%cd -b <name>
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or simply '%cd <name>' if there is no directory called <name> AND
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there is such a bookmark defined.
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Your bookmarks persist through IPython sessions, but they are
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associated with each profile."""
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opts,args = self.parse_options(parameter_s,'drl',mode='list')
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if len(args) > 2:
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raise UsageError("%bookmark: too many arguments")
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bkms = self.shell.db.get('bookmarks',{})
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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:
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raise UsageError(
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"%bookmark -d: must provide a bookmark to delete")
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else:
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try:
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del bkms[todel]
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except KeyError:
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raise UsageError(
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"%%bookmark -d: Can't delete bookmark '%s'" % todel)
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elif 'r' in opts:
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bkms = {}
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elif 'l' in opts:
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bks = bkms.keys()
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bks.sort()
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if bks:
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size = max(map(len, bks))
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else:
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size = 0
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fmt = '%-'+str(size)+'s -> %s'
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print 'Current bookmarks:'
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for bk in bks:
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print fmt % (bk, bkms[bk])
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else:
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if not args:
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raise UsageError("%bookmark: You must specify the bookmark name")
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elif len(args)==1:
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bkms[args[0]] = os.getcwdu()
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elif len(args)==2:
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bkms[args[0]] = args[1]
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self.shell.db['bookmarks'] = bkms
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@line_magic
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def pycat(self, parameter_s=''):
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"""Show a syntax-highlighted file through a pager.
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This magic is similar to the cat utility, but it will assume the file
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to be Python source and will show it with syntax highlighting.
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This magic command can either take a local filename, an url,
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an history range (see %history) or a macro as argument ::
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%pycat myscript.py
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%pycat 7-27
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%pycat myMacro
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%pycat http://www.example.com/myscript.py
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"""
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if not parameter_s:
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raise UsageError('Missing filename, URL, input history range, '
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'or macro.')
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try :
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cont = self.shell.find_user_code(parameter_s, skip_encoding_cookie=False)
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except (ValueError, IOError):
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print "Error: no such file, variable, URL, history range or macro"
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return
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page.page(self.shell.pycolorize(source_to_unicode(cont)))
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@magic_arguments.magic_arguments()
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@magic_arguments.argument(
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'-a', '--append', action='store_true', default=False,
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help='Append contents of the cell to an existing file. '
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'The file will be created if it does not exist.'
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)
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@magic_arguments.argument(
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'filename', type=unicode,
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help='file to write'
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)
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@cell_magic
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def file(self, line, cell):
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"""Write the contents of the cell to a file.
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The file will be overwritten unless the -a (--append) flag is specified.
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"""
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args = magic_arguments.parse_argstring(self.file, line)
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filename = os.path.expanduser(unquote_filename(args.filename))
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if os.path.exists(filename):
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if args.append:
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print "Appending to %s" % filename
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else:
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print "Overwriting %s" % filename
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else:
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print "Writing %s" % filename
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mode = 'a' if args.append else 'w'
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with io.open(filename, mode, encoding='utf-8') as f:
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f.write(cell)
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