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Date: Sun, 29 Apr 2012 13:00:45 -0400 (EDT)
From: "Benjamin R. Haskell" <benizi@benizi.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: Command not found handler for non-searched commands?
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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:
>
> 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
>
> Now $dir ends up containing '~/tmp/one-off-project', with the '~' 
> unexpanded.  Seeing as how the directory doesn't yet exist, I can't 
> just glob it.  Is there a function to do just named-directory 
> expansion?

Answered my own question, kind of...  I found the '~' parameter 
expansion flag.  Still don't 100% understand why pattern expansion 
(terminology?) is different than globbing w.r.t. non-existent files. 
Final solution ended up as the following (Difference is the 'dir=${~1}' 
line):


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

-- 
Best,
Ben