Re: [Jython-users] Interactive os.system()

[Philip J. <pj...@un...>]

On Aug 18, 2009, at 4:28 AM, Mayne, Peter wrote:

> Consider:
>
> >>> import os
> >>> os.system(‘vim file.txt’)
>
> Using CPython, this does what you’d expect. Using Jython, this  
> doesn’t: I get
>
> >>>  Warning: Output is not to a terminal
> >>>  Warning: Input is not from a terminal
>
> then depending on circumstance, on Linux I get a vim that can’t be  
> typed into, or is stuck in insert mode; on Windows vim uses all  
> remaining CPU. In both cases I have to kill the vim process to get  
> out.
>
> What’s happening here? Is it possible to make this work as expected?

We're limited by Java with what we can do with the input/output to  
subprocesses. It sounds like Java 7 will finally allow us to do this,  
though

A workaround is to explicitly direct in/out/err to your controlling  
tty. I don't think there's an easy way to determine the controlling  
tty from Jython, though. E.g.:

$ tty
/dev/ttys000
$ jython
Jython 2.5.0+ (trunk:6694, Aug 18 2009, 12:20:17)
[Java HotSpot(TM) 64-Bit Server VM (Apple Inc.)] on java1.6.0_13
Type "help", "copyright", "credits" or "license" for more information.
 >>> import os
 >>> os.system('vim < /dev/ttys000 > /dev/ttys000 2>&1')


--
Philip Jenvey