* Always save first N bytes of output from all commands?
@ 2019-01-08 14:53 Francisco Borges
2019-01-08 15:43 ` Daniel Shahaf
0 siblings, 1 reply; 2+ messages in thread
From: Francisco Borges @ 2019-01-08 14:53 UTC (permalink / raw)
To: zsh-users
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Hi,
Is there an easy easy way to *always* save the (first N bytes) of the
output all commands? Or least save the output of the very last command?
Something like always having
| tee ~/.output_history/$TTY/${HISTCMD}.out
but ideally with a control over the number of bytes written. Is something
like that possible?
Right now I resort to insert-last-command-output function (original by pws
at http://www.zsh.org/mla/users/2005/msg00550.html while answering a
question of mine...). To re-execute a command and insert its output in the
command line. Sometimes it is fast enough and sometimes it is slow. I know
we have "keep" (./share/zsh/functions/keeper) distributed with Zsh itself,
but keep much like tee has to be manually inserted into the command itself
and that it becomes less awesome.
I work on OSX and I bet I can write AppleScript code to... somehow fetch
the output and insert in the buffer but it I'd rather a (portable)
Zsh-based solution.
Any ideas other than going the AppleScript route?
--
Francisco
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Always save first N bytes of output from all commands?
2019-01-08 14:53 Always save first N bytes of output from all commands? Francisco Borges
@ 2019-01-08 15:43 ` Daniel Shahaf
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Shahaf @ 2019-01-08 15:43 UTC (permalink / raw)
To: Francisco Borges, zsh-users
Francisco Borges wrote on Tue, 08 Jan 2019 15:53 +0100:
> Is there an easy easy way to *always* save the (first N bytes) of the
> output all commands? Or least save the output of the very last command?
>
> Something like always having
>
> | tee ~/.output_history/$TTY/${HISTCMD}.out
>
> but ideally with a control over the number of bytes written. Is something
> like that possible?
>
> Right now I resort to insert-last-command-output function (original by pws
> at http://www.zsh.org/mla/users/2005/msg00550.html while answering a
> question of mine...). To re-execute a command and insert its output in the
> command line. Sometimes it is fast enough and sometimes it is slow. I know
> we have "keep" (./share/zsh/functions/keeper) distributed with Zsh itself,
> but keep much like tee has to be manually inserted into the command itself
> and that it becomes less awesome.
You could wrap the accept-line widget with something along these lines:
accept-line() {
PREBUFFER="{ $PREBUFFER"; BUFFER+=" }"
BUFFER+="| tee >(head -c 1024 > /path/to/file)"
zle .accept-word -- "$@"
}
zle -N accept-line
(untested)
However, commands that check if their stdout isatty() (the C equivalent
of «[[ -t 1 ]]») will with this change think it's not a tty. ls(1)
without arguments is the standard example of this. You could probably
fix that by creating a pty, but I don't have an example of that.
> I work on OSX and I bet I can write AppleScript code to... somehow fetch
> the output and insert in the buffer but it I'd rather a (portable)
> Zsh-based solution.
>
> Any ideas other than going the AppleScript route?
Cheers,
Daniel
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