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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <151012192908.ZM15508@torch.brasslantern.com>
Date: Mon, 12 Oct 2015 19:29:08 -0700
In-Reply-To: <561BE8DC.7060506@eastlink.ca>
Comments: In reply to Ray Andrews <rayandrews@eastlink.ca>
        "Re: subsitutions and beginning of lines." (Oct 12, 10:07am)
References: <561AB49A.4060801@eastlink.ca> 
	<20151011210902.566de251@ntlworld.com> 
	<561AEB2F.8030808@eastlink.ca> 
	<20151012103455.5f6159d7@pwslap01u.europe.root.pri> 
	<561BD55C.3080006@eastlink.ca> 
	<561BE8DC.7060506@eastlink.ca>
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To: zsh-users@zsh.org
Subject: Re: subsitutions and beginning of lines.
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On Oct 12, 10:07am, Ray Andrews wrote:
}
} ... Each search parameter is colorized incrementally.  (I add the minus 
} sign automatically) It now strips off the leading stuff as we've 
} discussed.  Code as I have it now is:
} 
}      OLDIFS=$IFS
}      IFS=$'\n' var=($(eval history $nnumber $sstring))
} 
}       echo "${(F)var[@]//#???????/}"
}       IFS=$OLDIFS
} 
} So, the 'eval'ed expression ends up like:
} 
} 'history -100 | grep --color=always to | grep --color=always 'a date' | ... '

If you're using "grep" to do the colorizing, there's no point in using
the $history variable to get the history entries, because you need them
to end up on stdout for passing through grep anyway.

(Generic advice to anyone reading this:  Asking about one small piece of
a larger problem is quite likely to get you an inappropriate solution.
Context is important.)

} the outputno longer lines up because double spaces become single
} spaces whereas double spaces are needed for the brutal ' //#???????/'
} substitution to work properly.

Why not simply use "history -n" so the numbers are omitted in the first
place?  Then you don't need to assign to var=(...) and apply //#.../.
That whole chunk of code just reduces to

    eval history -n $nnumber $sstring

and you're done.