Putting stdout from Python into vim

[Simon W. Jones]

Hello,

I am trying to capture the stdout (a simple digit) from a python script that I am calling from vim and assign it to a variable. I have been trying redir but can't seem to get it to work.

Any help would be appreciated!

Thanks.

Simon.

[Marc Weber]

let var = system('python script.py')

If you're using the :py command you have to lookup how to redirect
stdout within python if using redir doesn't work.

Marc Weber

[Tony Mechelynck]

Unless your Python script is using the Vim-Python interface (using
"import vim" etc.) you might run it independently:

:let py_retval = system('python mynicescript.py')

see :help system()


Or you might try to capture the stdout by means of the :redir statement
(see ":help :redir") but I don't know if it works:

(untested)
:redir => py_retval
:pyfile mynicescript.py
:redir END
:echo 'Result = �' . py_retval . '�'

Also, this might add ends-of-lines before and/or after your "single
digit" answer.


Best regards,
Tony.
--
We are all in the gutter, but some of us are looking at the stars.
-- Oscar Wilde

[Timothy Madden]

Redir worked just fine for me

:redir @a
:py import sys
:py print 2
:redir END
:echo @a

The code will display "2" preceded and followed by few new-lines

Timothy Madden

[Simon W. Jones]

Many thanks for the many answers, unfortunately I am still struggling.

The python script ends with:

sys.stdout.write(refs[int(chosen[1])][0])

When I run the script with %!nameofscript the correct answer is replaces the content of the current buffer. I still can't seem able to pipe it into a variable. Could it be because the python script gets user input from a dialog box that they have to select by pressing Enter?

Thanks again for all your assistance.

Simon.

[Tony Mechelynck]

%!nameofscript runs the script as a filter, i.e., its output replaces
the current buffer. This is intentional: for instance :2,$-1!sort uses
the external "sort" program to sort all lines of the current buffer
except the first and last. (It feeds lines 2 to $-1 to the stdin of
sort, and replaces them with its stdout.)

Use instead
:update | let variablename = system('nameofscript < ' .
shellescape(expand('%'),1))

Or if your script doesn't require to get your editfile as input, just use
:let variablename = system('nameofscript')

Or if your script can get its data from vim.current.range (after
importing vim), then

:redir => variablename
:%pyfile nameofscript
:redir END


Best regards,
Tony.
--
Keep Cool, but Don't Freeze
- Hellman's Mayonnaise

[Simon W. Jones]

On Sunday, September 16, 2012 5:32:09 PM UTC+1, Simon W. Jones wrote:

Brilliant. Thanks very much Tony. I've made sure your help is recognised in the vimscript!

[Marc Weber]

> Many thanks for the many answers, unfortunately I am still struggling.

> sys.stdout.write(refs[int(chosen[1])][0])

What about rereading what I wrote earlier?

Marc Weber

[Simon W. Jones]

I read and tried it Marc but it didn't work for me. Thanks for responding.

Simon.

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Simon W. Jones

[Marc Weber]

Excerpts from Simon W. Jones's message of Sun Sep 16 21:30:53 +0200 2012:

> I read and tried it Marc but it didn't work for me. Thanks for responding.

Hard to believe. Do you want to capture stderr?
let var = system('python script.py 2>&1') is the way to go then.

What else can go wrong this way?

Marc Weber

[Simon W. Jones]

Marc,

The solution that worked was the one provided by Tony, as I mentioned in my reply to him. It was:

:update | let variablename = system('nameofscript < ' . shellescape(expand('%'),1))

I did try your suggestion (as I've already written).

-------------
Simon W. Jones.

[Marc Weber]

Excerpts from Simon W. Jones's message of Sun Sep 16 22:37:24 +0200 2012:

> :update | let variablename = system('nameofscript < ' . shellescape(expand('%'),1))

system('nameofscript', join(getline(1,'$'),"\n"))

would be an alternative if you don't care about kind of line ending,
then you don't have to write the buffer.

I should have read all messages, I agree.

Marc Weber

[Timothy Madden]

On 09/16/2012 11:37 PM, Simon W. Jones wrote:
> Marc,
>
> The solution that worked was the one provided by Tony, as I mentioned in my reply to him. It was:
>
> :update | let variablename = system('nameofscript < ' . shellescape(expand('%'),1))
>
> I did try your suggestion (as I've already written).
>
> -------------
> Simon W. Jones.
>
> On 16 Sep 2012, at 21:20, Marc Weber <marco-...@gmx.de> wrote:
>
>> Excerpts from Simon W. Jones's message of Sun Sep 16 21:30:53 +0200 2012:
>>> I read and tried it Marc but it didn't work for me. Thanks for responding.
>> Hard to believe. Do you want to capture stderr?
>> let var = system('python script.py 2>&1') is the way to go then.
>>
>> What else can go wrong this way?

It looks to me what you actually needed was how to get the right input
for the python script.

Timothy Madden

[Tony Mechelynck]

Well, at first you didn't mention what kind of input your script needed;
I had to guess it from your mention of :%!nameofscript in a later post.


Best regards,
Tony.
--
With sufficient thrust, pigs fly just fine.
-- RFC 1925