Make use of fzf-tmux

[debnath-d]

Please make use of the __fzfcmd function as used in junegunn/fzf/shell/key-bindings.fish

function __fzfcmd
  test -n "$FZF_TMUX"; or set FZF_TMUX 0
  test -n "$FZF_TMUX_HEIGHT"; or set FZF_TMUX_HEIGHT 40%
  if [ -n "$FZF_TMUX_OPTS" ]
    echo "fzf-tmux $FZF_TMUX_OPTS -- "
  else if [ $FZF_TMUX -eq 1 ]
    echo "fzf-tmux -d$FZF_TMUX_HEIGHT -- "
  else
    echo "fzf"
  end
end

I'm not very familiar with fish scripting, but it seems to me that we need to make some modifications to this line:

eval $MCFLY_FZF_PATH --history-format fish dump --header -0 --options-json $MCFLY_FZF_OPTS | eval fzf -q '(commandline)' | 

where eval fzf needs to be eval (__fzfcmd).

This is for fish, and similar changes would need to be made for bash and zsh as well.