fish-shell/share/functions/fish_mode_prompt.fish

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# The fish_mode_prompt function is prepended to the prompt
function fish_mode_prompt --description "Displays the current mode"
# Do nothing if not in vi mode
if set -q __fish_vi_mode
switch $fish_bind_mode
case default
set_color --bold --background red white
echo '[N]'
case insert
set_color --bold --background green white
echo '[I]'
case visual
set_color --bold --background magenta white
echo '[V]'
end
set_color normal
echo -n ' '
end
end