* Minor details of command_not_found_handler
@ 2020-08-28 5:41 Bart Schaefer
2020-08-28 8:21 ` Roman Perepelitsa
0 siblings, 1 reply; 2+ messages in thread
From: Bart Schaefer @ 2020-08-28 5:41 UTC (permalink / raw)
To: Zsh hackers list
Doc says:
... If the function wishes to mimic the behaviour of the shell
when the command is not found, it should print the message `command not
found: cmd' to standard error and return status 127.
Except that does not really mimic the behavior. Interactive shells print e.g.:
zsh: command not found: notacommand
and non-interactive shells add a line number:
zsh:1: command not found: notacommand
This almost does it:
print -u2 -r -- "${functrace[1]:-$ZSH_ARGZERO}: command not found: $1"
return 127
The nit being that $functrace[1] for a login shell contains "-zsh"
rather than "zsh", and of course includes the line number whether or
not the shell is interactive.
One thing that the doc fails to mention is that, even when
function_argzero is set, $0 inside command_not_found_handler is the
same as $1 (i.e., the name of the not-found command). However, %N for
prompt expansion is "command_not_found_handler".
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Minor details of command_not_found_handler
2020-08-28 5:41 Minor details of command_not_found_handler Bart Schaefer
@ 2020-08-28 8:21 ` Roman Perepelitsa
0 siblings, 0 replies; 2+ messages in thread
From: Roman Perepelitsa @ 2020-08-28 8:21 UTC (permalink / raw)
To: Bart Schaefer; +Cc: Zsh hackers list
On Fri, Aug 28, 2020 at 7:41 AM Bart Schaefer <schaefer@brasslantern.com> wrote:
>
> Doc says:
> ... If the function wishes to mimic the behaviour of the shell
> when the command is not found, it should print the message `command not
> found: cmd' to standard error and return status 127.
FWIW, here's how I hook up GNU command-not-found in interactive Zsh:
function command_not_found_handler() {
emulate -L zsh
if (( $#functrace >= 2 )); then
print -ru2 -- "$functrace[1]: command not found: $1"
else
local msg="$(/usr/lib/command-not-found --no-failure-msg -- $1 2>&1)"
if [[ -n $msg ]]; then
print -ru2 -- ${msg#$'\n'}
else
print -ru2 -- "zsh: command not found: $1"
fi
fi
return 127
}
The check for (( $#functrace >= 2 )) is there in order to invoke the
incredibly slow /usr/lib/command-not-found only when mistyping a
command on the command line. It doesn't do exactly that but it's close
enough.
Roman.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-08-28 5:41 Minor details of command_not_found_handler Bart Schaefer
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