functions.zsh: set exa+bat preview for fzf-open

.zsh/functions.zsh

@@ -48,9 +48,14 @@ delete-branches() {
 
 fzf-open() {
   local output
+  local old_opts="$FZF_DEFAULT_OPTS"
+  FZF_DEFAULT_OPTS+=" --preview 'exa -al --group --group-directories-first --colour-scale --list-dirs --icons --git --time-style=full-iso {}' --bind '?:preview:bat --style=numbers --color=always --line-range :200 {}'"
   output=$(fzf </dev/tty)
-  vim --not-a-term ${output}
+  if [ ! -z "$output" ]; then
+      vim --not-a-term ${output}
+  fi
   zle reset-prompt
+  export FZF_DEFAULT_OPTS="$old_opts"
 }
 
 zle -N fzf-open