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Re: problem with call-process function
From: |
Emanuel Berg |
Subject: |
Re: problem with call-process function |
Date: |
Tue, 01 Dec 2015 01:15:13 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) |
Bostjan Vilfan <bostjanv@alum.mit.edu> writes:
> Hello, I'm using emacs version 24.5.1 on Windows 10,
Mega-gulp!
> The simple cases are straightforward enough.
> For example,
>
> (call-process "myprog.exe" nil t nil <additional> arguments>)
>
> will place the output plus error output of
> myprog.exe into the current buffer. However, when
> I tried to separate the output from the error
> output, I ran into problems. According to my reading
> of the manual (see above) one should replace
> "destination" (1st line of manual text) with
> ‘(REAL-DESTINATION ERROR-DESTINATION)’ where
> REAL-DESTINATION and ERROR-DESTINATION are one of
> the given alternatives; for example:
>
> (call-process "myprog.exe" nil (t nil) nil
> <additional arguments>)
Yeah, you need to quote the (t nil) otherwise it is
not a list with data but a *form*, i.e. a unary
function which named `t' to which you upon invocation
send the argument nil!
It works with '(t nil)
You can try this with this zsh script:
#!/bin/zsh
echo "This output is so standard, it even goes to stdout."
echo "I always do things the opposite way - it is so immature!" >&2
And this Elisp:
(call-process "~/chatty-program" ; the program to run
nil ; (no INFILE)
`(,(get-buffer-create "stdout-buffer") ; create #<buffer
stdout-buffer>
"~/chatty-errors") ; send errors to this file
) ; evaluate me
The backquote (`) creates a list, only it allows for
evaluation if something is preceeded by a comma (,).
Or, put it like this:
(list (get-buffer-create "stdout-buffer")
"~/chatty-errors")
--
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http://user.it.uu.se/~embe8573