Re: [Jython-Users] Defining commands in the shell ....

[Satya G. <sg...@be...>]

Jeff Emanuel wrote:

> 
>You would need to extend the language grammar. 
>
Is there any document that describes how to achieve this? Is it a 
recommended approach?
Thanks for any pointers,
-satya

> How about
>if your users issue this existing command?
> 
>  
>
>>>>print connect.__doc__
>>>>        
>>>>
> 
> 
>
>-----Original Message-----
>From: Satya Ghattu [mailto:sg...@be...]
>Sent: Friday, July 18, 2003 8:46 AM
>To: Updike, Clark
>Cc: 'jyt...@li...'
>Subject: Re: [Jython-Users] Defining commands in the shell ....
>
>
>Yes, I defined a sitecustomize.py file under the Lib directory to run and
>set my environment, something  like this:
>sitecustomize.py
>import sys
>def help(name):
>  if (name == "connect"):
>    print 'This command lets you connect to the server"
>The sitecustomize.py will be executed when you bring up an interactive
>session. I can do something like,
>  
>
>>>>help("connect")
>>>>        
>>>>
>And this will do what i want. 
>But my question is can I do something like,
>  
>
>>>>help connect
>>>>        
>>>>
>with out the enclosing brackets? Calling help("connect")  somehow doesn't
>seem natural. My users are complaining about that they do not want to call
>as if they are calling functions, they just want to be able to issue
>commands as if they are interacting with a command shell. 
>Can this be achieved?
>
>Thanks for any help,
>-satya
>
>Updike, Clark wrote:
>
>
>You can run a script in the environment that sets up the help function
>
>before the interactive session takes over.  I use this to set up
>
>lots of other stuff (database connections, app functions, variables)
>
>for users.
>
>
>
>I don't think the environment variable PYTHONSTARTUP (which runs the 
>
>specified script in Python) does anything in Jython.  However,
>
>this is how I achieve the same end.
>
>
>
>FILE PyEnv.py ----------------------------------------
>
># Sets up the custom command line environment.
>
># Can also run user scripts before going interactive.
>
>#
>
># FYI: calling batch file must use -i switch to go to an 
>
># interactive session after running the user's script.
>
>
>
>import sys
>
> 
>
># set up help function
>
># users can run help on the function object: help(envFunc)
>
># or on the string name of the function:     help('envFunc')
>
>def help(subject='help'):
>
>   """help([,subject]) -> None
>
>   
>
>      Put your high level help documentation goes here:
>
>      List of environments variables, functions, etc.
>
>   """   
>
>
>
>   if hasattr(subject,'__doc__'):
>
>
>
>     print subject.__doc__ # passed in function ref
>
>
>
>   else:
>
>
>
>     try:
>
>        exec("print " + subject + ".__doc__")
>
>     except NameError, e:
>
>        print "Nothing found by the name '" + subject + "'"
>
>
>
># set up anything else you want (variables, other fuctions, etc.)
>
>
>
># run user's script if present (argv[1])
>
>if len(sys.argv) > 1: 
>
>
>
>   execfile(sys.argv[1])
>
>   print 'Script %s has run' % sys.argv[1]
>
>
>
>
>
>FILE PyLaunch.bat ------------------------------------
>
>
>
>C:\APPS\jython-2.1\jython.bat -i PyEnv.py %1 %2 %3 %4 %5 %6 %7 
>
>
>
>
>
>Then, to start up the interactive session with the help function
>
>present, just run the bat file: 
>
>
>
>C:\temp>PyLaunch.bat
>
>
>
>C:\temp>C:\APPS\jython-2.1\jython.bat -i PyEnv.py
>
>  
>
>help(help)
>
>        
>
>help([,subject]) -> None
>
>
>
>      Put your high level help documentation goes here:
>
>      List of environments variables, functions, etc.
>
>
>
>  
>
>
>If you set up resources like database connections, be sure to use
>
>a try/finally construct in PyEnv.py to clean up after exceptions.
>
>
>
>Good luck,
>
>Clark
>
>
>
>-----Original Message-----
>
>From: Satya Ghattu [ mailto:sg...@be... <mailto:sg...@be...> ]
>
>Sent: Thursday, July 17, 2003 6:04 PM
>
>To: ' jyt...@li...
><mailto:jyt...@li...> '
>
>Subject: [Jython-Users] Defining commands in the shell ....
>
>
>
>
>
>Hello there...
>
>I am not sure if this is achievable in Jython interactive shell but 
>
>would like to know for sure ...
>
>Can I define 'commands' in jython that I can execute when a user types 
>
>it on the interactive shell?
>
>For example, I would like to define a 'help' command that shows the user 
>
>some basic help about my application. So, the user can just type,
>
> >>> help
>
>on the command prompt. And also can these commands take additional 
>
>arguments, like ...
>
> >>> help connection
>
>which should display help about connecting to my application.
>
>
>
>Thanks for any help,
>
>-satya
>
>
>
>
>
>
>
>
>
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