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"""Magic functions for running cells in various scripts."""
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from __future__ import print_function
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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 errno
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import os
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import sys
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import signal
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import time
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from subprocess import Popen, PIPE
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import atexit
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from IPython.core import magic_arguments
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from IPython.core.magic import (
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Magics, magics_class, line_magic, cell_magic
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)
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from IPython.lib.backgroundjobs import BackgroundJobManager
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from IPython.utils import py3compat
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from IPython.utils.process import arg_split
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from traitlets import List, Dict, default
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#-----------------------------------------------------------------------------
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# Magic implementation classes
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#-----------------------------------------------------------------------------
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def script_args(f):
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"""single decorator for adding script args"""
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args = [
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magic_arguments.argument(
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'--out', type=str,
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help="""The variable in which to store stdout from the script.
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If the script is backgrounded, this will be the stdout *pipe*,
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instead of the stderr text itself.
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"""
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),
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magic_arguments.argument(
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'--err', type=str,
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help="""The variable in which to store stderr from the script.
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If the script is backgrounded, this will be the stderr *pipe*,
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instead of the stderr text itself.
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"""
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),
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magic_arguments.argument(
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'--bg', action="store_true",
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help="""Whether to run the script in the background.
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If given, the only way to see the output of the command is
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with --out/err.
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"""
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),
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magic_arguments.argument(
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'--proc', type=str,
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help="""The variable in which to store Popen instance.
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This is used only when --bg option is given.
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"""
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),
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]
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for arg in args:
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f = arg(f)
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return f
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@magics_class
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class ScriptMagics(Magics):
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"""Magics for talking to scripts
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This defines a base `%%script` cell magic for running a cell
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with a program in a subprocess, and registers a few top-level
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magics that call %%script with common interpreters.
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"""
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script_magics = List(
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help="""Extra script cell magics to define
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This generates simple wrappers of `%%script foo` as `%%foo`.
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If you want to add script magics that aren't on your path,
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specify them in script_paths
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""",
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).tag(config=True)
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@default('script_magics')
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def _script_magics_default(self):
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"""default to a common list of programs"""
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defaults = [
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'sh',
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'bash',
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'perl',
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'ruby',
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'python',
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'python2',
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'python3',
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'pypy',
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]
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if os.name == 'nt':
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defaults.extend([
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'cmd',
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])
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return defaults
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script_paths = Dict(
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help="""Dict mapping short 'ruby' names to full paths, such as '/opt/secret/bin/ruby'
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Only necessary for items in script_magics where the default path will not
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find the right interpreter.
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"""
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).tag(config=True)
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def __init__(self, shell=None):
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super(ScriptMagics, self).__init__(shell=shell)
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self._generate_script_magics()
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self.job_manager = BackgroundJobManager()
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self.bg_processes = []
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atexit.register(self.kill_bg_processes)
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def __del__(self):
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self.kill_bg_processes()
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def _generate_script_magics(self):
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cell_magics = self.magics['cell']
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for name in self.script_magics:
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cell_magics[name] = self._make_script_magic(name)
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def _make_script_magic(self, name):
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"""make a named magic, that calls %%script with a particular program"""
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# expand to explicit path if necessary:
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script = self.script_paths.get(name, name)
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@magic_arguments.magic_arguments()
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@script_args
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def named_script_magic(line, cell):
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# if line, add it as cl-flags
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if line:
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line = "%s %s" % (script, line)
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else:
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line = script
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return self.shebang(line, cell)
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# write a basic docstring:
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named_script_magic.__doc__ = \
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"""%%{name} script magic
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Run cells with {script} in a subprocess.
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This is a shortcut for `%%script {script}`
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""".format(**locals())
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return named_script_magic
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@magic_arguments.magic_arguments()
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@script_args
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@cell_magic("script")
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def shebang(self, line, cell):
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"""Run a cell via a shell command
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The `%%script` line is like the #! line of script,
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specifying a program (bash, perl, ruby, etc.) with which to run.
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The rest of the cell is run by that program.
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Examples
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--------
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::
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In [1]: %%script bash
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...: for i in 1 2 3; do
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...: echo $i
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...: done
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1
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2
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3
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"""
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argv = arg_split(line, posix = not sys.platform.startswith('win'))
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args, cmd = self.shebang.parser.parse_known_args(argv)
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try:
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p = Popen(cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE)
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except OSError as e:
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if e.errno == errno.ENOENT:
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print("Couldn't find program: %r" % cmd[0])
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return
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else:
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raise
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if not cell.endswith('\n'):
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cell += '\n'
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cell = cell.encode('utf8', 'replace')
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if args.bg:
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self.bg_processes.append(p)
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self._gc_bg_processes()
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if args.out:
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self.shell.user_ns[args.out] = p.stdout
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if args.err:
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self.shell.user_ns[args.err] = p.stderr
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self.job_manager.new(self._run_script, p, cell, daemon=True)
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if args.proc:
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self.shell.user_ns[args.proc] = p
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return
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try:
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out, err = p.communicate(cell)
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except KeyboardInterrupt:
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try:
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p.send_signal(signal.SIGINT)
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time.sleep(0.1)
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if p.poll() is not None:
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print("Process is interrupted.")
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return
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p.terminate()
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time.sleep(0.1)
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if p.poll() is not None:
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print("Process is terminated.")
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return
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p.kill()
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print("Process is killed.")
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except OSError:
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pass
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except Exception as e:
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print("Error while terminating subprocess (pid=%i): %s" \
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% (p.pid, e))
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return
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out = py3compat.bytes_to_str(out)
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err = py3compat.bytes_to_str(err)
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if args.out:
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self.shell.user_ns[args.out] = out
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else:
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sys.stdout.write(out)
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sys.stdout.flush()
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if args.err:
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self.shell.user_ns[args.err] = err
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else:
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sys.stderr.write(err)
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sys.stderr.flush()
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def _run_script(self, p, cell):
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"""callback for running the script in the background"""
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p.stdin.write(cell)
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p.stdin.close()
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p.wait()
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@line_magic("killbgscripts")
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def killbgscripts(self, _nouse_=''):
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"""Kill all BG processes started by %%script and its family."""
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self.kill_bg_processes()
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print("All background processes were killed.")
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def kill_bg_processes(self):
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"""Kill all BG processes which are still running."""
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.poll() is None:
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try:
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p.send_signal(signal.SIGINT)
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except:
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pass
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time.sleep(0.1)
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self._gc_bg_processes()
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.poll() is None:
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try:
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p.terminate()
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except:
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pass
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time.sleep(0.1)
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self._gc_bg_processes()
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if not self.bg_processes:
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return
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for p in self.bg_processes:
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if p.poll() is None:
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try:
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p.kill()
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except:
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pass
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self._gc_bg_processes()
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def _gc_bg_processes(self):
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self.bg_processes = [p for p in self.bg_processes if p.poll() is None]
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