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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Fri, 03 Oct 2014 08:23:30 -0700
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 <CAHYJk3Rx9iBLgeeKcnnu4N-56CqsgNyNhJof5+_M8H0Y0BBi9Q@mail.gmail.com>
Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
 "Re: piping question" (Oct  3,  4:42pm)
References: <1412259225.3798.0@numa-i>
	<CAHYJk3Rx9iBLgeeKcnnu4N-56CqsgNyNhJof5+_M8H0Y0BBi9Q@mail.gmail.com>
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To: Mikael Magnusson <mikachu@gmail.com>
Subject: Re: piping question
Cc: Zsh Users <zsh-users@zsh.org>
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On Oct 3,  4:42pm, Mikael Magnusson wrote:
}
} echo hi there | { xterm -e 'most <& 7' 7< <(cat) }

I avoided that because I was concerned that some terminal emulators
would close all the descriptors above 2 when launching the command.

If it works, though, you can use the {varname}<& syntax to obtain
a free descriptor, and then you don't need <(cat).

    xmost() {
      set - "${(qq)@}"  # Requote command line arguments
      if [[ -t 0 ]]
      then
        xterm -g 180x30+0+0  -hold -e "most $*"
      else
        local stdin
        exec {stdin}<&0
        xterm -g 180x30+0+0  -hold -e "most $* <&$stdin"
      fi
    }

It's possible the [[ -t 0 ]] branch is extraneous with this trick, but
it seems prudent not to have xmost reading from two different ttys.