|
|
"""Magic functions for running cells in various scripts."""
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (c) 2012 The IPython Development Team.
|
|
|
#
|
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
#
|
|
|
# The full license is in the file COPYING.txt, distributed with this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
# Stdlib
|
|
|
import errno
|
|
|
import os
|
|
|
import re
|
|
|
import sys
|
|
|
import signal
|
|
|
import time
|
|
|
from subprocess import Popen, PIPE
|
|
|
import atexit
|
|
|
|
|
|
# Our own packages
|
|
|
from IPython.config.configurable import Configurable
|
|
|
from IPython.core import magic_arguments
|
|
|
from IPython.core.error import UsageError
|
|
|
from IPython.core.magic import (
|
|
|
Magics, magics_class, line_magic, cell_magic
|
|
|
)
|
|
|
from IPython.lib.backgroundjobs import BackgroundJobManager
|
|
|
from IPython.testing.skipdoctest import skip_doctest
|
|
|
from IPython.utils import py3compat
|
|
|
from IPython.utils.process import arg_split
|
|
|
from IPython.utils.traitlets import List, Dict
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Magic implementation classes
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
def script_args(f):
|
|
|
"""single decorator for adding script args"""
|
|
|
args = [
|
|
|
magic_arguments.argument(
|
|
|
'--out', type=str,
|
|
|
help="""The variable in which to store stdout from the script.
|
|
|
If the script is backgrounded, this will be the stdout *pipe*,
|
|
|
instead of the stderr text itself.
|
|
|
"""
|
|
|
),
|
|
|
magic_arguments.argument(
|
|
|
'--err', type=str,
|
|
|
help="""The variable in which to store stderr from the script.
|
|
|
If the script is backgrounded, this will be the stderr *pipe*,
|
|
|
instead of the stderr text itself.
|
|
|
"""
|
|
|
),
|
|
|
magic_arguments.argument(
|
|
|
'--bg', action="store_true",
|
|
|
help="""Whether to run the script in the background.
|
|
|
If given, the only way to see the output of the command is
|
|
|
with --out/err.
|
|
|
"""
|
|
|
),
|
|
|
magic_arguments.argument(
|
|
|
'--proc', type=str,
|
|
|
help="""The variable in which to store Popen instance.
|
|
|
This is used only when --bg option is given.
|
|
|
"""
|
|
|
),
|
|
|
]
|
|
|
for arg in args:
|
|
|
f = arg(f)
|
|
|
return f
|
|
|
|
|
|
@magics_class
|
|
|
class ScriptMagics(Magics, Configurable):
|
|
|
"""Magics for talking to scripts
|
|
|
|
|
|
This defines a base `%%script` cell magic for running a cell
|
|
|
with a program in a subprocess, and registers a few top-level
|
|
|
magics that call %%script with common interpreters.
|
|
|
"""
|
|
|
script_magics = List(config=True,
|
|
|
help="""Extra script cell magics to define
|
|
|
|
|
|
This generates simple wrappers of `%%script foo` as `%%foo`.
|
|
|
|
|
|
If you want to add script magics that aren't on your path,
|
|
|
specify them in script_paths
|
|
|
""",
|
|
|
)
|
|
|
def _script_magics_default(self):
|
|
|
"""default to a common list of programs"""
|
|
|
|
|
|
defaults = [
|
|
|
'sh',
|
|
|
'bash',
|
|
|
'perl',
|
|
|
'ruby',
|
|
|
'python',
|
|
|
'python3',
|
|
|
'pypy',
|
|
|
]
|
|
|
if os.name == 'nt':
|
|
|
defaults.extend([
|
|
|
'cmd',
|
|
|
'powershell',
|
|
|
])
|
|
|
|
|
|
return defaults
|
|
|
|
|
|
script_paths = Dict(config=True,
|
|
|
help="""Dict mapping short 'ruby' names to full paths, such as '/opt/secret/bin/ruby'
|
|
|
|
|
|
Only necessary for items in script_magics where the default path will not
|
|
|
find the right interpreter.
|
|
|
"""
|
|
|
)
|
|
|
|
|
|
def __init__(self, shell=None):
|
|
|
Configurable.__init__(self, config=shell.config)
|
|
|
self._generate_script_magics()
|
|
|
Magics.__init__(self, shell=shell)
|
|
|
self.job_manager = BackgroundJobManager()
|
|
|
self.bg_processes = []
|
|
|
atexit.register(self.kill_bg_processes)
|
|
|
|
|
|
def __del__(self):
|
|
|
self.kill_bg_processes()
|
|
|
|
|
|
def _generate_script_magics(self):
|
|
|
cell_magics = self.magics['cell']
|
|
|
for name in self.script_magics:
|
|
|
cell_magics[name] = self._make_script_magic(name)
|
|
|
|
|
|
def _make_script_magic(self, name):
|
|
|
"""make a named magic, that calls %%script with a particular program"""
|
|
|
# expand to explicit path if necessary:
|
|
|
script = self.script_paths.get(name, name)
|
|
|
|
|
|
@magic_arguments.magic_arguments()
|
|
|
@script_args
|
|
|
def named_script_magic(line, cell):
|
|
|
# if line, add it as cl-flags
|
|
|
if line:
|
|
|
line = "%s %s" % (script, line)
|
|
|
else:
|
|
|
line = script
|
|
|
return self.shebang(line, cell)
|
|
|
|
|
|
# write a basic docstring:
|
|
|
named_script_magic.__doc__ = \
|
|
|
"""%%{name} script magic
|
|
|
|
|
|
Run cells with {script} in a subprocess.
|
|
|
|
|
|
This is a shortcut for `%%script {script}`
|
|
|
""".format(**locals())
|
|
|
|
|
|
return named_script_magic
|
|
|
|
|
|
@magic_arguments.magic_arguments()
|
|
|
@script_args
|
|
|
@cell_magic("script")
|
|
|
def shebang(self, line, cell):
|
|
|
"""Run a cell via a shell command
|
|
|
|
|
|
The `%%script` line is like the #! line of script,
|
|
|
specifying a program (bash, perl, ruby, etc.) with which to run.
|
|
|
|
|
|
The rest of the cell is run by that program.
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
::
|
|
|
|
|
|
In [1]: %%script bash
|
|
|
...: for i in 1 2 3; do
|
|
|
...: echo $i
|
|
|
...: done
|
|
|
1
|
|
|
2
|
|
|
3
|
|
|
"""
|
|
|
argv = arg_split(line, posix = not sys.platform.startswith('win'))
|
|
|
args, cmd = self.shebang.parser.parse_known_args(argv)
|
|
|
|
|
|
try:
|
|
|
p = Popen(cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE)
|
|
|
except OSError as e:
|
|
|
if e.errno == errno.ENOENT:
|
|
|
print "Couldn't find program: %r" % cmd[0]
|
|
|
return
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
cell = cell.encode('utf8', 'replace')
|
|
|
if args.bg:
|
|
|
self.bg_processes.append(p)
|
|
|
self._gc_bg_processes()
|
|
|
if args.out:
|
|
|
self.shell.user_ns[args.out] = p.stdout
|
|
|
if args.err:
|
|
|
self.shell.user_ns[args.err] = p.stderr
|
|
|
self.job_manager.new(self._run_script, p, cell, daemon=True)
|
|
|
if args.proc:
|
|
|
self.shell.user_ns[args.proc] = p
|
|
|
return
|
|
|
|
|
|
try:
|
|
|
out, err = p.communicate(cell)
|
|
|
except KeyboardInterrupt:
|
|
|
try:
|
|
|
p.send_signal(signal.SIGINT)
|
|
|
time.sleep(0.1)
|
|
|
if p.poll() is not None:
|
|
|
print "Process is interrupted."
|
|
|
return
|
|
|
p.terminate()
|
|
|
time.sleep(0.1)
|
|
|
if p.poll() is not None:
|
|
|
print "Process is terminated."
|
|
|
return
|
|
|
p.kill()
|
|
|
print "Process is killed."
|
|
|
except OSError:
|
|
|
pass
|
|
|
except Exception as e:
|
|
|
print "Error while terminating subprocess (pid=%i): %s" \
|
|
|
% (p.pid, e)
|
|
|
return
|
|
|
out = py3compat.bytes_to_str(out)
|
|
|
err = py3compat.bytes_to_str(err)
|
|
|
if args.out:
|
|
|
self.shell.user_ns[args.out] = out
|
|
|
else:
|
|
|
sys.stdout.write(out)
|
|
|
sys.stdout.flush()
|
|
|
if args.err:
|
|
|
self.shell.user_ns[args.err] = err
|
|
|
else:
|
|
|
sys.stderr.write(err)
|
|
|
sys.stderr.flush()
|
|
|
|
|
|
def _run_script(self, p, cell):
|
|
|
"""callback for running the script in the background"""
|
|
|
p.stdin.write(cell)
|
|
|
p.stdin.close()
|
|
|
p.wait()
|
|
|
|
|
|
@line_magic("killbgscripts")
|
|
|
def killbgscripts(self, _nouse_=''):
|
|
|
"""Kill all BG processes started by %%script and its family."""
|
|
|
self.kill_bg_processes()
|
|
|
print "All background processes were killed."
|
|
|
|
|
|
def kill_bg_processes(self):
|
|
|
"""Kill all BG processes which are still running."""
|
|
|
for p in self.bg_processes:
|
|
|
if p.poll() is None:
|
|
|
try:
|
|
|
p.send_signal(signal.SIGINT)
|
|
|
except:
|
|
|
pass
|
|
|
time.sleep(0.1)
|
|
|
for p in self.bg_processes:
|
|
|
if p.poll() is None:
|
|
|
try:
|
|
|
p.terminate()
|
|
|
except:
|
|
|
pass
|
|
|
time.sleep(0.1)
|
|
|
for p in self.bg_processes:
|
|
|
if p.poll() is None:
|
|
|
try:
|
|
|
p.kill()
|
|
|
except:
|
|
|
pass
|
|
|
self._gc_bg_processes()
|
|
|
|
|
|
def _gc_bg_processes(self):
|
|
|
self.bg_processes = [p for p in self.bg_processes if p.poll() is None]
|
|
|
|
