97 lines
2.7 KiB
Plaintext
97 lines
2.7 KiB
Plaintext
``cli`` : command line interpreter
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===================================
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As Catherine Devlin, the author of `cmd2 <https://pythonhosted.org/cmd2/>`_ explained it:
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| Slightly after the bronze age came the command line interpreter.
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| I'm talking about **command line interpreters**
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| that is somewhat more specific terms than **command line applications**
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| or **command line utilities**
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A command line interpreter is a program that is
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- plain text
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- gives you a prompt
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- it gets all of its input at once
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- produces his output usually as text lines
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- gives you a prompt again
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unix shell instructions are a good example of that.
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A command line utilities is a unix-like program that gets all of its inputs at once
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and gives a result at once.
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At the other side, a text user interface is a litlle bit like a gui, it's closer to a gui.
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at this time, you have to think of how much effort your interface is worth,
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| otherwise it's gonna kill you to write it (Catherine Devlin)
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Basic cli functionnalities
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---------------------------
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A complete command line interpreter written with ``cmd``
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- it recognizes the concept of help (contextual help)
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- the previous commands (history) can be called again with the keyboard's up and down arrows
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- if yout hit Ctr-R and the first letters of a command you can call it again
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(bash-style history)
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- the tab key will finish out your command
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how to use it
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--------------
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::
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>>> from cli import Cli
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>>> prompt = Cli()
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>>> prompt.cmdloop()
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cli (command line interpreter)
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(type help or ? for commands list)
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#Prompt> ?
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Documented commands (type help <command>):
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==========================================
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EOF exit
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Undocumented commands:
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======================
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cmd help quit
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#Prompt>
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to add a command, just use inheritance::
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>>> from cli import Cli
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>>> class Prompt(Cli):
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... def do_hello(self, line):
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... print "hello %s", line
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...
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>>> prompt = Prompt()
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>>> prompt.cmdloop()
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cli (command line interpreter)
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(type help or ? for commands list)
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#Prompt> ?
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Documented commands (type help <command>):
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==========================================
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EOF exit
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Undocumented commands:
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======================
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cmd hello help quit
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#Prompt> hello world
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.. glossary::
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CLI
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CLI stands for Command Line Interface, is a tool that, well, it gives you a prompt
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.. literalinclude:: ../snippets/cli.py
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:caption: basic command line utility library
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If you want your :term:`cli` to have more functionalities, try `cm2 <http://www.phyast.pitt.edu/~micheles/python/cmd2.html>`_.
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.. important:: Don't use `input()` but `raw_input()` for your command lines
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