simplify some things and remove some unused code

home/terminal/shell/zsh.nix

@@ -1,6 +1,4 @@
 {config, ...}: {
-  programs.fzf.enable = true;
-
   programs.zsh = {
     enable = true;
     autocd = true;
@@ -11,6 +9,8 @@
 
     history = {
       expireDuplicatesFirst = true;
+      extended = true;
+      save = 100 * 1000;
       path = "${config.xdg.dataHome}/zsh_history";
     };
     initExtra = ''
@@ -41,13 +41,31 @@
 
 
       ## PROMPT ##
+      function preexec() {
+        timer=$(date +%s%3N)
+      }
+
+      function precmd_timer() {
+        if [ $timer ]; then
+          now=$(date +%s%3N)
+          elapsed=$(($now-$timer))
+
+          if [[ elapsed -gt 100 ]]; then
+            export RPROMPT="%F{cyan}''${elapsed}ms %f"
+          else
+            unset RPROMPT
+          fi
+          unset timer
+        fi
+      }
+
       autoload -Uz vcs_info
       precmd_vcs_info() { vcs_info }
-      precmd_functions+=( precmd_vcs_info )
+      precmd_functions+=( precmd_vcs_info precmd_timer )
       zstyle ':vcs_info:git:*' formats ' %b '
       setopt prompt_subst
 
-      PROMPT="%F{blue}[%F{magenta}%n%F{blue}@%F{magenta}%M%F{blue}] %~%f %F{green}\$vcs_info_msg_0_%f%(?..%F{red}| %? )%#%f "
+      PROMPT='%F{blue}[%F{magenta}%n%F{blue}@%F{magenta}%M%F{blue}] %~%f %F{green}$vcs_info_msg_0_%f%(?..%F{red}| %? )%#%f '
     '';
   };
 }