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1# pysh.py - command processing for pysh.
2#
3# Copyright 2007 Patrick Mezard
4#
5# This software may be used and distributed according to the terms
6# of the GNU General Public License, incorporated herein by reference.
7
8import optparse
9import os
10import sys
11
12import interp
13
14SH_OPT = optparse.OptionParser(prog='pysh', usage="%prog [OPTIONS]", version='0.1')
15SH_OPT.add_option('-c', action='store_true', dest='command_string', default=None,
16 help='A string that shall be interpreted by the shell as one or more commands')
17SH_OPT.add_option('--redirect-to', dest='redirect_to', default=None,
18 help='Redirect script commands stdout and stderr to the specified file')
19# See utility_command in builtin.py about the reason for this flag.
20SH_OPT.add_option('--redirected', dest='redirected', action='store_true', default=False,
21 help='Tell the interpreter that stdout and stderr are actually the same objects, which is really stdout')
22SH_OPT.add_option('--debug-parsing', action='store_true', dest='debug_parsing', default=False,
23 help='Trace PLY execution')
24SH_OPT.add_option('--debug-tree', action='store_true', dest='debug_tree', default=False,
25 help='Display the generated syntax tree.')
26SH_OPT.add_option('--debug-cmd', action='store_true', dest='debug_cmd', default=False,
27 help='Trace command execution before parameters expansion and exit status.')
28SH_OPT.add_option('--debug-utility', action='store_true', dest='debug_utility', default=False,
29 help='Trace utility calls, after parameters expansions')
30SH_OPT.add_option('--ast', action='store_true', dest='ast', default=False,
31 help='Encoded commands to execute in a subprocess')
32SH_OPT.add_option('--profile', action='store_true', default=False,
33 help='Profile pysh run')
34
35
36def split_args(args):
37 # Separate shell arguments from command ones
38 # Just stop at the first argument not starting with a dash. I know, this is completely broken,
39 # it ignores files starting with a dash or may take option values for command file. This is not
40 # supposed to happen for now
41 command_index = len(args)
42 for i,arg in enumerate(args):
43 if not arg.startswith('-'):
44 command_index = i
45 break
46
47 return args[:command_index], args[command_index:]
48
49
50def fixenv(env):
51 path = env.get('PATH')
52 if path is not None:
53 parts = path.split(os.pathsep)
54 # Remove Windows utilities from PATH, they are useless at best and
55 # some of them (find) may be confused with other utilities.
56 parts = [p for p in parts if 'system32' not in p.lower()]
57 env['PATH'] = os.pathsep.join(parts)
58 if env.get('HOME') is None:
59 # Several utilities, including cvsps, cannot work without
60 # a defined HOME directory.
61 env['HOME'] = os.path.expanduser('~')
62 return env
63
64def _sh(cwd, shargs, cmdargs, options, debugflags=None, env=None):
65 if os.environ.get('PYSH_TEXT') != '1':
66 import msvcrt
67 for fp in (sys.stdin, sys.stdout, sys.stderr):
68 msvcrt.setmode(fp.fileno(), os.O_BINARY)
69
70 hgbin = os.environ.get('PYSH_HGTEXT') != '1'
71
72 if debugflags is None:
73 debugflags = []
74 if options.debug_parsing: debugflags.append('debug-parsing')
75 if options.debug_utility: debugflags.append('debug-utility')
76 if options.debug_cmd: debugflags.append('debug-cmd')
77 if options.debug_tree: debugflags.append('debug-tree')
78
79 if env is None:
80 env = fixenv(dict(os.environ))
81 if cwd is None:
82 cwd = os.getcwd()
83
84 if not cmdargs:
85 # Nothing to do
86 return 0
87
88 ast = None
89 command_file = None
90 if options.command_string:
91 input = cmdargs[0]
92 if not options.ast:
93 input += '\n'
94 else:
95 args, input = interp.decodeargs(input), None
96 env, ast = args
97 cwd = env.get('PWD', cwd)
98 else:
99 command_file = cmdargs[0]
100 arguments = cmdargs[1:]
101
102 prefix = interp.resolve_shebang(command_file, ignoreshell=True)
103 if prefix:
104 input = ' '.join(prefix + [command_file] + arguments)
105 else:
106 # Read commands from file
107 f = file(command_file)
108 try:
109 # Trailing newline to help the parser
110 input = f.read() + '\n'
111 finally:
112 f.close()
113
114 redirect = None
115 try:
116 if options.redirected:
117 stdout = sys.stdout
118 stderr = stdout
119 elif options.redirect_to:
120 redirect = open(options.redirect_to, 'wb')
121 stdout = redirect
122 stderr = redirect
123 else:
124 stdout = sys.stdout
125 stderr = sys.stderr
126
127 # TODO: set arguments to environment variables
128 opts = interp.Options()
129 opts.hgbinary = hgbin
130 ip = interp.Interpreter(cwd, debugflags, stdout=stdout, stderr=stderr,
131 opts=opts)
132 try:
133 # Export given environment in shell object
134 for k,v in env.iteritems():
135 ip.get_env().export(k,v)
136 return ip.execute_script(input, ast, scriptpath=command_file)
137 finally:
138 ip.close()
139 finally:
140 if redirect is not None:
141 redirect.close()
142
143def sh(cwd=None, args=None, debugflags=None, env=None):
144 if args is None:
145 args = sys.argv[1:]
146 shargs, cmdargs = split_args(args)
147 options, shargs = SH_OPT.parse_args(shargs)
148
149 if options.profile:
150 import lsprof
151 p = lsprof.Profiler()
152 p.enable(subcalls=True)
153 try:
154 return _sh(cwd, shargs, cmdargs, options, debugflags, env)
155 finally:
156 p.disable()
157 stats = lsprof.Stats(p.getstats())
158 stats.sort()
159 stats.pprint(top=10, file=sys.stderr, climit=5)
160 else:
161 return _sh(cwd, shargs, cmdargs, options, debugflags, env)
162
163def main():
164 sys.exit(sh())
165
166if __name__=='__main__':
167 main()