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# pysh.py - command processing for pysh.
#
# Copyright 2007 Patrick Mezard
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
import optparse
import os
import sys
import interp
SH_OPT = optparse.OptionParser(prog='pysh', usage="%prog [OPTIONS]", version='0.1')
SH_OPT.add_option('-c', action='store_true', dest='command_string', default=None,
help='A string that shall be interpreted by the shell as one or more commands')
SH_OPT.add_option('--redirect-to', dest='redirect_to', default=None,
help='Redirect script commands stdout and stderr to the specified file')
# See utility_command in builtin.py about the reason for this flag.
SH_OPT.add_option('--redirected', dest='redirected', action='store_true', default=False,
help='Tell the interpreter that stdout and stderr are actually the same objects, which is really stdout')
SH_OPT.add_option('--debug-parsing', action='store_true', dest='debug_parsing', default=False,
help='Trace PLY execution')
SH_OPT.add_option('--debug-tree', action='store_true', dest='debug_tree', default=False,
help='Display the generated syntax tree.')
SH_OPT.add_option('--debug-cmd', action='store_true', dest='debug_cmd', default=False,
help='Trace command execution before parameters expansion and exit status.')
SH_OPT.add_option('--debug-utility', action='store_true', dest='debug_utility', default=False,
help='Trace utility calls, after parameters expansions')
SH_OPT.add_option('--ast', action='store_true', dest='ast', default=False,
help='Encoded commands to execute in a subprocess')
SH_OPT.add_option('--profile', action='store_true', default=False,
help='Profile pysh run')
def split_args(args):
# Separate shell arguments from command ones
# Just stop at the first argument not starting with a dash. I know, this is completely broken,
# it ignores files starting with a dash or may take option values for command file. This is not
# supposed to happen for now
command_index = len(args)
for i,arg in enumerate(args):
if not arg.startswith('-'):
command_index = i
break
return args[:command_index], args[command_index:]
def fixenv(env):
path = env.get('PATH')
if path is not None:
parts = path.split(os.pathsep)
# Remove Windows utilities from PATH, they are useless at best and
# some of them (find) may be confused with other utilities.
parts = [p for p in parts if 'system32' not in p.lower()]
env['PATH'] = os.pathsep.join(parts)
if env.get('HOME') is None:
# Several utilities, including cvsps, cannot work without
# a defined HOME directory.
env['HOME'] = os.path.expanduser('~')
return env
def _sh(cwd, shargs, cmdargs, options, debugflags=None, env=None):
if os.environ.get('PYSH_TEXT') != '1':
import msvcrt
for fp in (sys.stdin, sys.stdout, sys.stderr):
msvcrt.setmode(fp.fileno(), os.O_BINARY)
hgbin = os.environ.get('PYSH_HGTEXT') != '1'
if debugflags is None:
debugflags = []
if options.debug_parsing: debugflags.append('debug-parsing')
if options.debug_utility: debugflags.append('debug-utility')
if options.debug_cmd: debugflags.append('debug-cmd')
if options.debug_tree: debugflags.append('debug-tree')
if env is None:
env = fixenv(dict(os.environ))
if cwd is None:
cwd = os.getcwd()
if not cmdargs:
# Nothing to do
return 0
ast = None
command_file = None
if options.command_string:
input = cmdargs[0]
if not options.ast:
input += '\n'
else:
args, input = interp.decodeargs(input), None
env, ast = args
cwd = env.get('PWD', cwd)
else:
command_file = cmdargs[0]
arguments = cmdargs[1:]
prefix = interp.resolve_shebang(command_file, ignoreshell=True)
if prefix:
input = ' '.join(prefix + [command_file] + arguments)
else:
# Read commands from file
f = file(command_file)
try:
# Trailing newline to help the parser
input = f.read() + '\n'
finally:
f.close()
redirect = None
try:
if options.redirected:
stdout = sys.stdout
stderr = stdout
elif options.redirect_to:
redirect = open(options.redirect_to, 'wb')
stdout = redirect
stderr = redirect
else:
stdout = sys.stdout
stderr = sys.stderr
# TODO: set arguments to environment variables
opts = interp.Options()
opts.hgbinary = hgbin
ip = interp.Interpreter(cwd, debugflags, stdout=stdout, stderr=stderr,
opts=opts)
try:
# Export given environment in shell object
for k,v in env.iteritems():
ip.get_env().export(k,v)
return ip.execute_script(input, ast, scriptpath=command_file)
finally:
ip.close()
finally:
if redirect is not None:
redirect.close()
def sh(cwd=None, args=None, debugflags=None, env=None):
if args is None:
args = sys.argv[1:]
shargs, cmdargs = split_args(args)
options, shargs = SH_OPT.parse_args(shargs)
if options.profile:
import lsprof
p = lsprof.Profiler()
p.enable(subcalls=True)
try:
return _sh(cwd, shargs, cmdargs, options, debugflags, env)
finally:
p.disable()
stats = lsprof.Stats(p.getstats())
stats.sort()
stats.pprint(top=10, file=sys.stderr, climit=5)
else:
return _sh(cwd, shargs, cmdargs, options, debugflags, env)
def main():
sys.exit(sh())
if __name__=='__main__':
main()
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