From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-request@math.gatech.edu>
Received: (qmail 16879 invoked from network); 9 Dec 1998 02:58:11 -0000
Received: from math.gatech.edu (list@130.207.146.50)
  by ns1.primenet.com.au with SMTP; 9 Dec 1998 02:58:11 -0000
Received: (from list@localhost)
	by math.gatech.edu (8.9.1/8.9.1) id VAA09535;
	Tue, 8 Dec 1998 21:56:44 -0500 (EST)
Resent-Date: Tue, 8 Dec 1998 21:56:10 -0500 (EST)
From: "Bart Schaefer" <schaefer@brasslantern.com>
Message-Id: <981208185501.ZM7746@candle.brasslantern.com>
Date: Tue, 8 Dec 1998 18:55:01 -0800
In-Reply-To: <19981209011923.40055@athenaeum.demon.co.uk>
Comments: In reply to Phil Pennock <phil@athenaeum.demon.co.uk>
        "Re: "Fallback" alias/function in zsh" (Dec  9,  1:19am)
References: <19981208220443.A180@morpheus.demon.co.uk> 
	<981208155032.ZM7173@candle.brasslantern.com> 
	<19981209011923.40055@athenaeum.demon.co.uk>
X-Mailer: Z-Mail (4.0b.820 20aug96)
To: zsh-users@math.gatech.edu
Subject: Re: "Fallback" alias/function in zsh
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Resent-Message-ID: <"vhLMD.0.8K2.ARURs"@math>
Resent-From: zsh-users@math.gatech.edu
X-Mailing-List: <zsh-users@math.gatech.edu> archive/latest/1968
X-Loop: zsh-users@math.gatech.edu
X-Loop: zsh-workers@math.gatech.edu
Precedence: list
Resent-Sender: zsh-workers-request@math.gatech.edu

On Dec 9,  1:19am, Phil Pennock wrote:
} Subject: Re: "Fallback" alias/function in zsh
}
} Typing away merrily, Bart Schaefer produced the immortal words:
} > In 3.1.5, there's the preexec() function, in which you could do something
} > like this:
} > 
} >   function preexec() {
} >     command=("$@")
} >   }
} >   function precmd() {
} >     (($?)) && CMD /C "$command[@]"
} >   }
} 
} That seems dangerous.  The problem looks to be 'if path lookup fails'
} not 'if path lookup fails or program returns non-zero'; could be fun to
} run a grep(1) port and have it run twice if no matches were found ...

Easily enough adjusted:

  function precmd() {
    (($?)) && { whence "$command[1]" >& /dev/null || CMD /C "$command[@]" }
  }

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com