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Use command line tool in Python

Project description

This library makes you use command line tool in Python more easier. The original idea and most of basic codes are from GitPython project

Basic Usage

# without options
uname = SingleCmd('uname')
# result is Linux
print uname()

# with args
expr  = SingleCmd('expr')
# result is 10
print expr(7, '+', 3)

# with options, the style is '-a - l'
# example: ls -a -l
ls = SingleCmd('ls')
# enable debug mode to see what command string will be executed.
# show the debug message like this: DBG: execute cmd 'ls -a -l'
ls.__DEBUG__ = True
print ls(l=True, a=True)

# with boolean options, the style is 'ls --all --almost-all'
# variable has '-' should replaced by '_', otherwise syntax error happens
print ls(all=True, almost_all=True)

# with key-value optons, has 2 different style,
# `--key value` or `--key=value`, you can use opt_style variable to control them
wget = SingleCmd('wget')

# replacement of wget -o log http://url
wget('http://url', o='log')

# replacement of wget -o log=http://url
wget = SingleCmd('wget', opt_style=1)
wget('http://url', o='log')

# you can also overwrite the bound command
ls.cmdname = 'echo'
# the result is
# DBG: execute cmd 'echo hi'
print ls("hi")

# some options is mutiple, which means the name is name, but you can give
# many different values, for example
# `foo -a -b -o Dir=/var -o Dir::Cache=/tmp`
# so you need to use make_optargs to create args if the opt name is duplicate
optargs = ucltip.make_optargs('o', ('Dir=/var','Dir::Cache=/tmp'))
SingleCmd('foo')(optargs, a=True, b=True)

The command be executed by, it bypass the shell.

# the result is $HOME, and it will not show output directly
print SingleCmd('echo')("$HOME")

if you want execute command via shell and use shell enviroment variable, please do as follow, if args of function includes via_shell=True, the command be executed by os.system

# the result is "/home/somebody", and show output directly
SingleCmd('echo')("$HOME", via_shell=True)

And here is the replacement if you want to do pipe for mutiple commands

ls = SingleCmd('ls')
grep = SingleCmd('grep')
# the result is
print grep('', stdin=ls(a=True, interact=True).stdout))

#p.s ls(a=True, interact=True) return a Popen instance, so you can have more control
#    of that process

Handling Error of command execution

if the command you want to use is not exists, the exception ucltip.CommandNotFound raises

>> a=ucltip.SingleCmd('oo')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "ucltip/", line 103, in __init__
    raise CommandNotFound()

if the command be executed falied, the exception ucltip.CommandExecutedFalur raises

>>> a=ucltip.SingleCmd('ls')
>>> a
SingleCmd object bound 'ls'
>>> a(ccc=True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "ucltip/", line 109, in __call__
    return self._callProcess(*args, **kwargs)
  File "ucltip/", line 126, in _callProcess
    return self.execute(call, **_kwargs)
  File "ucltip/", line 169, in execute
    raise CommandExecutedFalur(status, stderr_value)
ucltip.CommandExecutedFalur: ls: unrecognized option '--ccc'
Try `ls --help' for more information.

here is a example to hanlde error:

        print ucltip.SingleCmd('ls')
except ucltip.CommandExecutedFalur as e:
        print e

Command Dispatcher

Some command tools has sub command, like git, zenity, pbuilder, apt-get, etc. and some commands like zenity, they have prefix string in their sub command.

# the sub command name is the method name
git = CmdDispatcher('git')
# and you can also give args and options like what SingleCmd can use
git.log(raw=True, since='2010')

# you can get Popen instance also
proc = git.log(interact=True)

# zenity has '--' prefix in its sub command, so you need to specify prefix string
# and option style
zenity = CmdDispatcher('zneity', opt_style=1, subcmd_prefix='--')

# zneity --info --text=hi"hi")

Project details

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