From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org
X-Spam-Level: 
X-Spam-Status: No, score=-1.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,
	DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_LOW,
	UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4
Received: (qmail 22164 invoked from network); 28 Aug 2020 08:21:40 -0000
Received: from zero.zsh.org (2a02:898:31:0:48:4558:7a:7368)
  by inbox.vuxu.org with ESMTPUTF8; 28 Aug 2020 08:21:40 -0000
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=zsh.org;
	s=rsa-20200801; h=List-Archive:List-Owner:List-Post:List-Unsubscribe:
	List-Subscribe:List-Help:List-Id:Sender:Content-Type:Cc:To:Subject:Message-ID
	:Date:From:In-Reply-To:References:MIME-Version:Reply-To:
	Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date:
	Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID;
	bh=K3DMFREKWRy/tvOBIqvwMWGPhuuRX/WbtfJ75Jm/eVM=; b=jDWQDDHcSfxq3+lUurZe8AICuA
	626ICAcHRIX+yLu9LT0PTSAINYyjn7IK28fEnX/JQjYOL+qKmNiNKpufj1QfEVxaX+6PUB/hpPjGl
	/v400gSX6yI0+mz8M4UnTGGMU9KRB/mgD6TfEEI8IWJ0RBldxOpwNk3aCdA7JKxKxPwz/SR65crtw
	YEYKRYC37B0ZOGLQVb1bgA2IakgTgGdL4Y3SjXSkgzwf4uqX/VXNCxYK+tplnS70S7FJIdZE+YHts
	DUNhqtR6Z89WsLp9cZdivismWbsS6iaDcJOF6zX0KajTh2YVgmyMl5HkRHopOgdkNsHoRvuPxBYjg
	UlSq5SVw==;
Received: from authenticated user by zero.zsh.org with local 
	id 1kBZdg-000ChJ-7S; Fri, 28 Aug 2020 08:21:36 +0000
Authentication-Results: zsh.org;
	iprev=pass (mail-io1-f54.google.com) smtp.remote-ip=209.85.166.54;
	dkim=pass header.d=gmail.com header.s=20161025 header.a=rsa-sha256;
	dmarc=skipped;
	arc=none
Received: from mail-io1-f54.google.com ([209.85.166.54]:39192)
	by zero.zsh.org with esmtps (TLS1.3:TLS_AES_128_GCM_SHA256:128)
	id 1kBZdN-000CYg-IM; Fri, 28 Aug 2020 08:21:19 +0000
Received: by mail-io1-f54.google.com with SMTP id h10so400636ioq.6
        for <zsh-workers@zsh.org>; Fri, 28 Aug 2020 01:21:17 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=mime-version:references:in-reply-to:from:date:message-id:subject:to
         :cc;
        bh=K3DMFREKWRy/tvOBIqvwMWGPhuuRX/WbtfJ75Jm/eVM=;
        b=quMkC8q4nfej6O7fsV+ncePtDRxzGXNKAwV9J8T6pFmYqhojyWgDe4U65k6RKW6Kwf
         siPLfM9EIe2IRhPxo8/IQWZMer5On/x7JTK7oZ6RTkAtt8xvrfMZYSIP3ch7nS0zsz4u
         T+WyyJy18W6QNMuBRLjLijXEz/19CECcr7+I+X6evjK8JIfJ823lgYwuzDf6wW/LJLD2
         QAW+g/vszQv9WF31uCK8oIH1YHD1a2lqMWNQKQQNSXppRQZ10Wd0Zd17A8nUe3OhtmYa
         moewc3Zm9Hg8ldH6UCa4CakOA/5qla5oxeIAT8GOigicgmWYdA2fRmUZUtnzqP87gieF
         9lvg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:mime-version:references:in-reply-to:from:date
         :message-id:subject:to:cc;
        bh=K3DMFREKWRy/tvOBIqvwMWGPhuuRX/WbtfJ75Jm/eVM=;
        b=eYYCYOSbmMsXk7W/YcCdhTEhSyj+R9UPgfc8ykWLnAqSPtx49Sr1tHW5PWqEa83tBt
         CvD6JzAytp8H8jB+5NxhFwbAfudDDwpjK3EPvieHopKntbXKqIXg/wzrQ1yYyItDCupY
         PNO7qewCsrWaCOyPQI5WYp1oIF8s+CSmtTkX7X/CYmqgSInpA6xufHpdHN+FE8oEZk0c
         lRz9J9NU4fYAIItcXTbqJhis39wu5Ho8HSDSbWa1RKmwKxt+adUZkC+FddZMQwA4Sgm1
         1GQz98US+bFzkGyb5Fma6Pjpw7/1Q+WDWMy+94fMAOwO0XZhSViKcmMqUrsIYjmzOXnl
         t4IQ==
X-Gm-Message-State: AOAM530BmHVIbXDe83trA6oywjrdkFo+Bbd5kujLSg2imusrD5VhwMtK
	7CETNocPu9sFlNbNZns5lVfKWP8/E4LQXJHyqoc=
X-Google-Smtp-Source: ABdhPJzpRykxGZZs7C+zKZjLQPjZpqVmUgqrpC3Jbo5Z/Ty41PWYSI2UBkZ6AFhkR+G1K7ePCmtbvwMHpRryfsr9BiI=
X-Received: by 2002:a02:820b:: with SMTP id o11mr175826jag.136.1598602875315;
 Fri, 28 Aug 2020 01:21:15 -0700 (PDT)
MIME-Version: 1.0
References: <CAH+w=7aUeoTJFJiEqZYMoa0D6StxTfZGraUYADJYWbuu1uSC4A@mail.gmail.com>
In-Reply-To: <CAH+w=7aUeoTJFJiEqZYMoa0D6StxTfZGraUYADJYWbuu1uSC4A@mail.gmail.com>
From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Date: Fri, 28 Aug 2020 10:21:04 +0200
Message-ID: <CAN=4vMpszhuF3V5RGgwwUa5tv1GZ9NSOcsKCmmAy__49qtNw+w@mail.gmail.com>
Subject: Re: Minor details of command_not_found_handler
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"
X-Seq: 47346
Archived-At: <https://zsh.org/workers/47346>
X-Loop: zsh-workers@zsh.org
Errors-To: zsh-workers-owner@zsh.org
Precedence: list
Precedence: bulk
Sender: zsh-workers-request@zsh.org
X-no-archive: yes
List-Id: <zsh-workers.zsh.org>
List-Help: <mailto:sympa@zsh.org?subject=help>
List-Subscribe: <mailto:sympa@zsh.org?subject=subscribe%20zsh-workers>
List-Unsubscribe: <mailto:sympa@zsh.org?subject=unsubscribe%20zsh-workers>
List-Post: <mailto:zsh-workers@zsh.org>
List-Owner: <mailto:zsh-workers-request@zsh.org>
List-Archive: <http://www.zsh.org/sympa/arc/zsh-workers>
Archived-At: <http://www.zsh.org/sympa/arcsearch_id/zsh-workers/2020-08/CAN%3D4vMpszhuF3V5RGgwwUa5tv1GZ9NSOcsKCmmAy__49qtNw%2Bw%40mail.gmail.com>

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.