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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <131025102311.ZM9171@torch.brasslantern.com>
Date: Fri, 25 Oct 2013 10:23:11 -0700
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 <CANSNSoUB6pJ=6++7yL=2BUrYLyjDvZ7y6cDERfe_zYWtot9WHQ@mail.gmail.com>
Comments: In reply to Jesse Hathaway <jesse@mbuki-mvuki.org>
 "Re: Duplicating TRANSIENT_RPROMPT for left PROPMT?" (Oct 25, 10:50am)
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 <CANSNSoWkeU4GyV4qbd1TJEheX5gQ4=0mm-TwPPs+TNjHxyv4Qg@mail.gmail.com>
	<131023064759.ZM9762@torch.brasslantern.com>
	<CANSNSoUB6pJ=6++7yL=2BUrYLyjDvZ7y6cDERfe_zYWtot9WHQ@mail.gmail.com>
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To: ZSH Users Mailing List <zsh-users@zsh.org>
Subject: Re: Duplicating TRANSIENT_RPROMPT for left PROPMT?
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On Oct 25, 10:50am, Jesse Hathaway wrote:
}
} I tried the zle -M approach, but it seemed to result in my cursor sometimes
} being at the bottom of the output, and them sometimes the vim_mode prompt
} appearing, i.e. my cursor was jumping up and down.
} 
} I ended up adding a preexec which solves the problem:
} 
} # Clear vim_mode prompt before executing command, as the command output
} will be
} # written to same line as the vim_mode prompt on the terminal
} function preexec {
}   echo -n "$terminfo[el]"
} }

Here's another possibility I should have thought of before:

---- 8< ----
PS1='%~ '
vim_ins_mode=$'\n'"-- INSERT --"
vim_cmd_mode=""

zle-keymap-select() {
  vim_mode="${${KEYMAP/vicmd/${vim_cmd_mode}}/(main|viins)/${vim_ins_mode}}"
  POSTDISPLAY=$vim_mode
  zle redisplay
}
zle -N zle-keymap-select
zle -N zle-line-init zle-keymap-select

zle-line-finish() {
  if [[ -n $POSTDISPLAY ]]
  then
    POSTDISPLAY=''
    zle redisplay
  fi
}
zle -N zle-line-finish
---- 8< ----

I think this solves all the problems so far discussed.