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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <120327065911.ZM6744@torch.brasslantern.com>
Date: Tue, 27 Mar 2012 06:59:11 -0700
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Comments: In reply to Madsen Zhang <md11235@gmail.com>
 "Re: are there some ways to get things like isearch-{start,end}-position?"
 (Mar 27,  2:58pm)
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To: zsh-users@zsh.org
Subject: Re: are there some ways to get things like
 isearch-{start,end}-position?
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On Mar 27,  2:58pm, Madsen Zhang wrote:
>
> if the last isearch direction is available, the following script, based on
> the one from Bart Schaefer, should work in both forward and backward
> isearch:
> 
> zle-isearch-exit() {
>     if [[ $ISEARCHDIR -eq 1 ]]; then
>         local match mbegin mend
>         setopt extendedglob
>         [[ -n $LASTSEARCH ]] || return 0
>         : ${LBUFFER%(#b)(*)$LASTSEARCH}
>         CURSOR=$mend[1]
>     fi
> 
>     return 0
> }
> zle -N zle-isearch-exit

You can set ISEARCHDIR for yourself by putting a little wrapper function
around history-incremental-search-*.

hist-inc-search-save-direction() {
    if [[ $WIDGET = *-forward ]]; then
        typeset -g ISEARCHDIR=1
        zle .history-incremental-search-forward "$@"
    else
        typeset -g ISEARCHDIR=-1
        zle .history-incremental-search-backward "$@"
    fi
}
zle -N history-incremental-search-forward hist-inc-search-save-direction
zle -N history-incremental-search-backward hist-inc-search-save-direction

I'm not sure I got the semantics of ISEARCHDIR the way you wanted them,
but you get the idea.