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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <111013123237.ZM9529@torch.brasslantern.com>
Date: Thu, 13 Oct 2011 12:32:37 -0700
In-reply-to: <5F28EC71-35D4-45EF-9F75-FE853DF420BA@gmail.com>
Comments: In reply to Aaron Davies <aaron.davies@gmail.com>
 "Re: Would like an alias to read the part of the current command line that
 precedes the alias" (Oct 12, 11:15pm)
References: <20111010231518.BFD1A10E2AA@smtp.hushmail.com>
	<111010190517.ZM5763@torch.brasslantern.com>
	<5F28EC71-35D4-45EF-9F75-FE853DF420BA@gmail.com>
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To: zsh-users@zsh.org
Subject: Re: Would like an alias to read the part of the current command line
 that precedes the alias
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On Oct 12, 11:15pm, Aaron Davies wrote:
}
} First, and I think this is general, it triggers again off of a blank
} command line (i.e. pressing return a second time) after the specified
} time has elapsed.

You can fix this by keeping track of $HISTCMD and skipping the alert
if it hasn't incremented.

} Second, and this is probably due to my setup, I can't get the failure
} detection working. The third growlnotify call below should have a -a
} argument of "Problem Reporter".
}
} Any idea what I'm doing wrong?

My example was incomplete.  I tested without the (( SECONDS > N )) and
that resets $? before the part after the && happens.

    typeset -g _LASTALERT=$HISTCMD
    preexec() {
      SECONDS=0
    }
    precmd() {
      local alert="${${?/0/Terminal}//<->*/Problem Reporter}"
      (( _LASTALERT < HISTCMD && SECONDS > 1 )) &&
        growlnotify -p "Very Low" -a "$alert" -m "$history[$_LASTALERT]"
      _LASTALERT=$HISTCMD
    }

Note that this is also going to put up a dialog if you interrupt a
command with ctrl-c.  Fixing that would involve saving $? and checking
for what signal it indicates was received, i.e. ^C is 130.