Re: Command not found handler for non-searched commands?

["Benjamin R. Haskell" <zsh@benizi.com>]

On Sun, 29 Apr 2012, Benjamin R. Haskell wrote:

> On Sun, 29 Apr 2012, Benjamin R. Haskell wrote:
>
>> On Sun, 29 Apr 2012, Benjamin R. Haskell wrote:
>> 
>> > I use autocd quite a bit.  And often the first thing I want to do 
>> > when starting a new project is to create a directory and cd into 
>> > it.  I tried creating the following command_not_found_handler:
>> > 
>> Okay.  Different tack, different problem:
>> [...]
> Final solution ended up as the following [...]:
>
> preexec {
> __last_command=$1
> # ... etc.
> }
>
> trap '
> local dir= create=
> set -- ${=__last_command}
> (( $# == 1 )) || return 1
> [[ $1 == */* ]] || return 1
> dir=${~1}
> read -q "create?Create $dir [y/N]? " || return 1
> mkdir -p $dir || return 1
> cd $dir
> ' ZERR

Still talking to myself, but in case someone else follows my lead, I 
found fairly quickly that this wreaks havoc on unrelated non-zero 
error codes.  (e.g. `false ; echo yay` does not echo 'yay').

After reading the section from the manual on:

trap '' ZERR
vs.
TRAPZERR () { }

yet again, I realized I shouldn't be calling 'return' explicitly 
(because it returns from the calling context).  So, I'm now at:

preexec {
 	__last_command=$1
 	# ... etc.
}

trap '
 	local dir= choose=
 	set -- ${=__last_command}
 	if (( $# == 1 )) && [[ $1 == */* ]] ; then
 		if read -q "choose?Create $1 [y/N]? " ; then
 			dir=${~1}
 			if mkdir -p $dir ; then
 				cd $dir
 			fi
 		fi
 	fi
' ZERR


This still feels substantially heavier-weight than the 
command_not_found_handler I'd been hoping for.  But, it seems to be 
working.

-- 
Best,
Ben