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#!/usr/bin/env python
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#!/usr/bin/env python
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"""Module for interactively running scripts.
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"""Module for interactively running scripts.
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This module implements classes for interactively running scripts written for
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This module implements classes for interactively running scripts written for
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any system with a prompt which can be matched by a regexp suitable for
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any system with a prompt which can be matched by a regexp suitable for
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pexpect. It can be used to run as if they had been typed up interactively, an
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pexpect. It can be used to run as if they had been typed up interactively, an
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arbitrary series of commands for the target system.
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arbitrary series of commands for the target system.
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The module includes classes ready for IPython (with the default prompts),
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The module includes classes ready for IPython (with the default prompts),
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plain Python and SAGE, but making a new one is trivial. To see how to use it,
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plain Python and SAGE, but making a new one is trivial. To see how to use it,
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simply run the module as a script:
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simply run the module as a script:
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./irunner.py --help
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./irunner.py --help
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This is an extension of Ken Schutte <kschutte-AT-csail.mit.edu>'s script
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This is an extension of Ken Schutte <kschutte-AT-csail.mit.edu>'s script
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contributed on the ipython-user list:
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contributed on the ipython-user list:
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http://scipy.net/pipermail/ipython-user/2006-May/001705.html
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http://scipy.net/pipermail/ipython-user/2006-May/001705.html
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NOTES:
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NOTES:
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- This module requires pexpect, available in most linux distros, or which can
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- This module requires pexpect, available in most linux distros, or which can
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be downloaded from
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be downloaded from
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http://pexpect.sourceforge.net
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http://pexpect.sourceforge.net
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- Because pexpect only works under Unix or Windows-Cygwin, this has the same
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- Because pexpect only works under Unix or Windows-Cygwin, this has the same
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limitations. This means that it will NOT work under native windows Python.
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limitations. This means that it will NOT work under native windows Python.
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"""
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"""
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# Stdlib imports
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# Stdlib imports
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import optparse
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import optparse
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import sys
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import sys
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# Third-party modules.
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# Third-party modules.
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import pexpect
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import pexpect
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# Global usage strings, to avoid indentation issues when typing it below.
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# Global usage strings, to avoid indentation issues when typing it below.
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USAGE = """
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USAGE = """
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Interactive script runner, type: %s
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Interactive script runner, type: %s
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runner [opts] script_name
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runner [opts] script_name
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"""
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"""
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# The generic runner class
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# The generic runner class
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class InteractiveRunner(object):
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class InteractiveRunner(object):
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"""Class to run a sequence of commands through an interactive program."""
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"""Class to run a sequence of commands through an interactive program."""
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def __init__(self,program,prompts,args=None):
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def __init__(self,program,prompts,args=None):
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"""Construct a runner.
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"""Construct a runner.
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Inputs:
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Inputs:
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- program: command to execute the given program.
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- program: command to execute the given program.
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- prompts: a list of patterns to match as valid prompts, in the
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- prompts: a list of patterns to match as valid prompts, in the
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format used by pexpect. This basically means that it can be either
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format used by pexpect. This basically means that it can be either
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a string (to be compiled as a regular expression) or a list of such
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a string (to be compiled as a regular expression) or a list of such
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(it must be a true list, as pexpect does type checks).
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(it must be a true list, as pexpect does type checks).
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If more than one prompt is given, the first is treated as the main
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If more than one prompt is given, the first is treated as the main
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program prompt and the others as 'continuation' prompts, like
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program prompt and the others as 'continuation' prompts, like
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python's. This means that blank lines in the input source are
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python's. This means that blank lines in the input source are
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ommitted when the first prompt is matched, but are NOT ommitted when
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ommitted when the first prompt is matched, but are NOT ommitted when
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the continuation one matches, since this is how python signals the
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the continuation one matches, since this is how python signals the
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end of multiline input interactively.
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end of multiline input interactively.
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Optional inputs:
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Optional inputs:
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- args(None): optional list of strings to pass as arguments to the
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- args(None): optional list of strings to pass as arguments to the
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child program.
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child program.
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Public members not parameterized in the constructor:
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- delaybeforesend(0): Newer versions of pexpect have a delay before
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sending each new input. For our purposes here, it's typically best
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to just set this to zero, but if you encounter reliability problems
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or want an interactive run to pause briefly at each prompt, just
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increase this value (it is measured in seconds). Note that this
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variable is not honored at all by older versions of pexpect.
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"""
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"""
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self.program = program
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self.program = program
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self.prompts = prompts
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self.prompts = prompts
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if args is None: args = []
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if args is None: args = []
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self.args = args
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self.args = args
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# Other public members which we don't make as parameters, but which
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# users may occasionally want to tweak
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self.delaybeforesend = 0
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def run_file(self,fname,interact=False):
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def run_file(self,fname,interact=False):
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"""Run the given file interactively.
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"""Run the given file interactively.
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Inputs:
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Inputs:
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-fname: name of the file to execute.
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-fname: name of the file to execute.
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See the run_source docstring for the meaning of the optional
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See the run_source docstring for the meaning of the optional
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arguments."""
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arguments."""
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fobj = open(fname,'r')
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fobj = open(fname,'r')
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try:
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try:
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self.run_source(fobj,interact)
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self.run_source(fobj,interact)
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finally:
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finally:
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fobj.close()
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fobj.close()
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def run_source(self,source,interact=False):
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def run_source(self,source,interact=False):
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"""Run the given source code interactively.
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"""Run the given source code interactively.
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Inputs:
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Inputs:
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- source: a string of code to be executed, or an open file object we
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- source: a string of code to be executed, or an open file object we
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can iterate over.
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can iterate over.
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Optional inputs:
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Optional inputs:
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- interact(False): if true, start to interact with the running
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- interact(False): if true, start to interact with the running
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program at the end of the script. Otherwise, just exit.
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program at the end of the script. Otherwise, just exit.
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"""
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"""
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# if the source is a string, chop it up in lines so we can iterate
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# if the source is a string, chop it up in lines so we can iterate
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# over it just as if it were an open file.
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# over it just as if it were an open file.
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if not isinstance(source,file):
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if not isinstance(source,file):
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source = source.splitlines(True)
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source = source.splitlines(True)
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# grab the true write method of stdout, in case anything later
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# grab the true write method of stdout, in case anything later
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# reassigns sys.stdout, so that we really are writing to the true
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# reassigns sys.stdout, so that we really are writing to the true
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# stdout and not to something else.
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# stdout and not to something else.
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write = sys.stdout.write
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write = sys.stdout.write
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c = pexpect.spawn(self.program,self.args,timeout=None)
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c = pexpect.spawn(self.program,self.args,timeout=None)
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c.delaybeforesend = self.delaybeforesend
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prompts = c.compile_pattern_list(self.prompts)
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prompts = c.compile_pattern_list(self.prompts)
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prompt_idx = c.expect_list(prompts)
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prompt_idx = c.expect_list(prompts)
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# Flag whether the script ends normally or not, to know whether we can
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# Flag whether the script ends normally or not, to know whether we can
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# do anything further with the underlying process.
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# do anything further with the underlying process.
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end_normal = True
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end_normal = True
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for cmd in source:
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for cmd in source:
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# skip blank lines for all matches to the 'main' prompt, while the
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# skip blank lines for all matches to the 'main' prompt, while the
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# secondary prompts do not
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# secondary prompts do not
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if prompt_idx==0 and cmd.isspace():
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if prompt_idx==0 and cmd.isspace():
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continue
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continue
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write(c.after)
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write(c.after)
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c.send(cmd)
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c.send(cmd)
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try:
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try:
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prompt_idx = c.expect_list(prompts)
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prompt_idx = c.expect_list(prompts)
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except pexpect.EOF:
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except pexpect.EOF:
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# this will happen if the child dies unexpectedly
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# this will happen if the child dies unexpectedly
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write(c.before)
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write(c.before)
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end_normal = False
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end_normal = False
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break
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break
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write(c.before)
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write(c.before)
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if isinstance(source,file):
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if isinstance(source,file):
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source.close()
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source.close()
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if end_normal:
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if end_normal:
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if interact:
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if interact:
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c.send('\n')
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c.send('\n')
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print '<< Starting interactive mode >>',
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print '<< Starting interactive mode >>',
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try:
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try:
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c.interact()
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c.interact()
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except OSError:
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except OSError:
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# This is what fires when the child stops. Simply print a
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# This is what fires when the child stops. Simply print a
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# newline so the system prompt is aligned. The extra
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# newline so the system prompt is aligned. The extra
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# space is there to make sure it gets printed, otherwise
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# space is there to make sure it gets printed, otherwise
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# OS buffering sometimes just suppresses it.
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# OS buffering sometimes just suppresses it.
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write(' \n')
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write(' \n')
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sys.stdout.flush()
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sys.stdout.flush()
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else:
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else:
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c.close()
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c.close()
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else:
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else:
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if interact:
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if interact:
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e="Further interaction is not possible: child process is dead."
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e="Further interaction is not possible: child process is dead."
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print >> sys.stderr, e
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print >> sys.stderr, e
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def main(self,argv=None):
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def main(self,argv=None):
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"""Run as a command-line script."""
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"""Run as a command-line script."""
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parser = optparse.OptionParser(usage=USAGE % self.__class__.__name__)
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parser = optparse.OptionParser(usage=USAGE % self.__class__.__name__)
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newopt = parser.add_option
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newopt = parser.add_option
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newopt('-i','--interact',action='store_true',default=False,
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newopt('-i','--interact',action='store_true',default=False,
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help='Interact with the program after the script is run.')
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help='Interact with the program after the script is run.')
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opts,args = parser.parse_args(argv)
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opts,args = parser.parse_args(argv)
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if len(args) != 1:
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if len(args) != 1:
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print >> sys.stderr,"You must supply exactly one file to run."
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print >> sys.stderr,"You must supply exactly one file to run."
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sys.exit(1)
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sys.exit(1)
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self.run_file(args[0],opts.interact)
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self.run_file(args[0],opts.interact)
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# Specific runners for particular programs
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# Specific runners for particular programs
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class IPythonRunner(InteractiveRunner):
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class IPythonRunner(InteractiveRunner):
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"""Interactive IPython runner.
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"""Interactive IPython runner.
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This initalizes IPython in 'nocolor' mode for simplicity. This lets us
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This initalizes IPython in 'nocolor' mode for simplicity. This lets us
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avoid having to write a regexp that matches ANSI sequences, though pexpect
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avoid having to write a regexp that matches ANSI sequences, though pexpect
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does support them. If anyone contributes patches for ANSI color support,
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does support them. If anyone contributes patches for ANSI color support,
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they will be welcome.
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they will be welcome.
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It also sets the prompts manually, since the prompt regexps for
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It also sets the prompts manually, since the prompt regexps for
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pexpect need to be matched to the actual prompts, so user-customized
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pexpect need to be matched to the actual prompts, so user-customized
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prompts would break this.
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prompts would break this.
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"""
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"""
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def __init__(self,program = 'ipython',args=None):
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def __init__(self,program = 'ipython',args=None):
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"""New runner, optionally passing the ipython command to use."""
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"""New runner, optionally passing the ipython command to use."""
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args0 = ['-colors','NoColor',
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args0 = ['-colors','NoColor',
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'-pi1','In [\\#]: ',
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'-pi1','In [\\#]: ',
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'-pi2',' .\\D.: ']
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'-pi2',' .\\D.: ']
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if args is None: args = args0
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if args is None: args = args0
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else: args = args0 + args
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else: args = args0 + args
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prompts = [r'In \[\d+\]: ',r' \.*: ']
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prompts = [r'In \[\d+\]: ',r' \.*: ']
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InteractiveRunner.__init__(self,program,prompts,args)
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InteractiveRunner.__init__(self,program,prompts,args)
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class PythonRunner(InteractiveRunner):
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class PythonRunner(InteractiveRunner):
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"""Interactive Python runner."""
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"""Interactive Python runner."""
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def __init__(self,program='python',args=None):
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def __init__(self,program='python',args=None):
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"""New runner, optionally passing the python command to use."""
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"""New runner, optionally passing the python command to use."""
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prompts = [r'>>> ',r'\.\.\. ']
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prompts = [r'>>> ',r'\.\.\. ']
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InteractiveRunner.__init__(self,program,prompts,args)
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InteractiveRunner.__init__(self,program,prompts,args)
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class SAGERunner(InteractiveRunner):
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class SAGERunner(InteractiveRunner):
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"""Interactive SAGE runner.
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"""Interactive SAGE runner.
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XXX - This class is currently untested, meant for feedback from the SAGE
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WARNING: this runner only works if you manually configure your SAGE copy
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team. """
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to use 'colors NoColor' in the ipythonrc config file, since currently the
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prompt matching regexp does not identify color sequences."""
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def __init__(self,program='sage',args=None):
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def __init__(self,program='sage',args=None):
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"""New runner, optionally passing the sage command to use."""
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"""New runner, optionally passing the sage command to use."""
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print 'XXX - This class is currently untested!!!'
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print 'It is a placeholder, meant for feedback from the SAGE team.'
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prompts = ['sage: ',r'\s*\.\.\. ']
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prompts = ['sage: ',r'\s*\.\.\. ']
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InteractiveRunner.__init__(self,program,prompts,args)
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|
InteractiveRunner.__init__(self,program,prompts,args)
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247
|
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# Global usage string, to avoid indentation issues if typed in a function def.
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|
# Global usage string, to avoid indentation issues if typed in a function def.
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MAIN_USAGE = """
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|
MAIN_USAGE = """
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|
%prog [options] file_to_run
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|
%prog [options] file_to_run
|
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|
|
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251
|
|
|
240
|
This is an interface to the various interactive runners available in this
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252
|
This is an interface to the various interactive runners available in this
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241
|
module. If you want to pass specific options to one of the runners, you need
|
|
253
|
module. If you want to pass specific options to one of the runners, you need
|
|
242
|
to first terminate the main options with a '--', and then provide the runner's
|
|
254
|
to first terminate the main options with a '--', and then provide the runner's
|
|
243
|
options. For example:
|
|
255
|
options. For example:
|
|
244
|
|
|
256
|
|
|
245
|
irunner.py --python -- --help
|
|
257
|
irunner.py --python -- --help
|
|
246
|
|
|
258
|
|
|
247
|
will pass --help to the python runner. Similarly,
|
|
259
|
will pass --help to the python runner. Similarly,
|
|
248
|
|
|
260
|
|
|
249
|
irunner.py --ipython -- --log test.log script.ipy
|
|
261
|
irunner.py --ipython -- --interact script.ipy
|
|
|
|
|
262
|
|
|
|
|
|
263
|
will run the script.ipy file under the IPython runner, and then will start to
|
|
|
|
|
264
|
interact with IPython at the end of the script (instead of exiting).
|
|
|
|
|
265
|
|
|
|
|
|
266
|
The already implemented runners are listed below; adding one for a new program
|
|
|
|
|
267
|
is a trivial task, see the source for examples.
|
|
250
|
|
|
268
|
|
|
251
|
will run the script.ipy file under the IPython runner, logging all output into
|
|
269
|
WARNING: the SAGE runner only works if you manually configure your SAGE copy
|
|
252
|
the test.log file.
|
|
270
|
to use 'colors NoColor' in the ipythonrc config file, since currently the
|
|
|
|
|
271
|
prompt matching regexp does not identify color sequences.
|
|
253
|
"""
|
|
272
|
"""
|
|
254
|
|
|
273
|
|
|
255
|
def main():
|
|
274
|
def main():
|
|
256
|
"""Run as a command-line script."""
|
|
275
|
"""Run as a command-line script."""
|
|
257
|
|
|
276
|
|
|
258
|
parser = optparse.OptionParser(usage=MAIN_USAGE)
|
|
277
|
parser = optparse.OptionParser(usage=MAIN_USAGE)
|
|
259
|
newopt = parser.add_option
|
|
278
|
newopt = parser.add_option
|
|
260
|
parser.set_defaults(mode='ipython')
|
|
279
|
parser.set_defaults(mode='ipython')
|
|
261
|
newopt('--ipython',action='store_const',dest='mode',const='ipython',
|
|
280
|
newopt('--ipython',action='store_const',dest='mode',const='ipython',
|
|
262
|
help='IPython interactive runner (default).')
|
|
281
|
help='IPython interactive runner (default).')
|
|
263
|
newopt('--python',action='store_const',dest='mode',const='python',
|
|
282
|
newopt('--python',action='store_const',dest='mode',const='python',
|
|
264
|
help='Python interactive runner.')
|
|
283
|
help='Python interactive runner.')
|
|
265
|
newopt('--sage',action='store_const',dest='mode',const='sage',
|
|
284
|
newopt('--sage',action='store_const',dest='mode',const='sage',
|
|
266
|
help='SAGE interactive runner - UNTESTED.')
|
|
285
|
help='SAGE interactive runner.')
|
|
267
|
|
|
286
|
|
|
268
|
opts,args = parser.parse_args()
|
|
287
|
opts,args = parser.parse_args()
|
|
269
|
runners = dict(ipython=IPythonRunner,
|
|
288
|
runners = dict(ipython=IPythonRunner,
|
|
270
|
python=PythonRunner,
|
|
289
|
python=PythonRunner,
|
|
271
|
sage=SAGERunner)
|
|
290
|
sage=SAGERunner)
|
|
272
|
runners[opts.mode]().main(args)
|
|
291
|
runners[opts.mode]().main(args)
|
|
273
|
|
|
292
|
|
|
274
|
if __name__ == '__main__':
|
|
293
|
if __name__ == '__main__':
|
|
275
|
main()
|
|
294
|
main()
|