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,
 How about
if your users issue this existing command?
print connect.__doc__

-----Original Message-----
From: Satya Ghattu []
Sent: Friday, July 18, 2003 8:46 AM
To: Updike, Clark
Cc: ''
Subject: Re: [Jython-Users] Defining commands in the shell ....

Yes, I defined a file under the Lib directory to run and
set my environment, something  like this:
import sys
def help(name):
  if (name == "connect"):
    print 'This command lets you connect to the server"
The will be executed when you bring up an interactive
session. I can do something like,
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,

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 ----------------------------------------

# 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



        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: 


   print 'Script %s has run' % sys.argv[1]

FILE PyLaunch.bat ------------------------------------

C:\APPS\jython-2.1\jython.bat -i %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>C:\APPS\jython-2.1\jython.bat -i




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 to clean up after exceptions.

Good luck,


-----Original Message-----

From: Satya Ghattu [ <> ]

Sent: Thursday, July 17, 2003 6:04 PM

To: '
<> '

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,



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