zsh vi mode status line

This has already been answered at Super User and Unix Stack Exchange. For the completeness of Stack Overflow:

function zle-line-init zle-keymap-select {    RPS1="${${KEYMAP/vicmd/-- NORMAL --}/(main|viins)/-- INSERT --}"    RPS2=$RPS1    zle reset-prompt}zle -N zle-line-initzle -N zle-keymap-select

And if you want the indicator below the current line rather than to the right, from Unix Stack Exchange:

terminfo_down_sc=$terminfo[cud1]$terminfo[cuu1]$terminfo[sc]$terminfo[cud1]function zle-line-init zle-keymap-select {    PS1_2="${${KEYMAP/vicmd/-- NORMAL --}/(main|viins)/-- INSERT --}"    PS1="%{$terminfo_down_sc$PS1_2$terminfo[rc]%}%~ %# "    zle reset-prompt}preexec () { print -rn -- $terminfo[el]; }

Exactly, I can understand your concern and if you don't mind using a plugin, I think the below one can help you show the vi mode status perfectly, also the additional bonus of better experience on vi mode and so on.

zsh-vi-mode: A better and friendly vi(vim) mode plugin for ZSH.
https://github.com/jeffreytse/zsh-vi-mode

This plugin has provided a ZVM_MODE variable for you to retrieve current vi mode and better show the indicator.

And currently the below modes are supported:

ZVM_MODE_NORMALZVM_MODE_INSERTZVM_MODE_VISUALZVM_MODE_VISUAL_LINE

For updating the vi mode indicator, we should add our commands to zvm_after_select_vi_mode_commands. For example:

After you install this plugin

# The plugin will auto execute this `zvm_after_select_vi_mode` functionfunction zvm_after_select_vi_mode() {  case $ZVM_MODE in    $ZVM_MODE_NORMAL)      # Something you want to do...      ;;    $ZVM_MODE_INSERT)      # Something you want to do...      ;;    $ZVM_MODE_VISUAL)      # Something you want to do...      ;;    $ZVM_MODE_VISUAL_LINE)      # Something you want to do...      ;;  esac}

Here is an example: