Activate zsh rehash with pacman hook

home/.config/zsh/03-aliases.zsh

@@ -21,6 +21,34 @@ _fzf_compgen_path() {
 	_skim_compgen_path
 }
 
+# Command not found handler
+# source https://wiki.archlinux.org/title/Zsh#pacman_-F_%22command_not_found%22_handler
+function command_not_found_handler {
+    local purple='\e[1;35m' bright='\e[0;1m' green='\e[1;32m' reset='\e[0m'
+    printf 'zsh: command not found: %s\n' "$1"
+    local entries=(
+        ${(f)"$(/usr/bin/pacman -F --machinereadable -- "/usr/bin/$1")"}
+    )
+    if (( ${#entries[@]} ))
+    then
+        printf "${bright}$1${reset} may be found in the following packages:\n"
+        local pkg
+        for entry in "${entries[@]}"
+        do
+            # (repo package version file)
+            local fields=(
+                ${(0)entry}
+            )
+            if [[ "$pkg" != "${fields[2]}" ]]
+            then
+                printf "${purple}%s/${bright}%s ${green}%s${reset}\n" "${fields[1]}" "${fields[2]}" "${fields[3]}"
+            fi
+            printf '    /%s\n' "${fields[4]}"
+            pkg="${fields[2]}"
+        done
+    fi
+}
+
 # search and install packages with skim
 pi() { 
 	SELECTED_PKGS="$(paru -Slq | sk --header='Install packages' -m --preview 'paru -Si {1}')"

home/.config/zsh/06-pacman.zsh

@@ -1,6 +1,17 @@
 # from https://wiki.archlinux.org/index.php/Zsh#On-demand_rehash
-catch_signal_usr1() {
-  trap catch_signal_usr1 USR1
-  rehash
+
+zshcache_time="$(date +%s%N)"
+
+autoload -Uz add-zsh-hook
+
+rehash_precmd() {
+  if [[ -a /var/cache/zsh/pacman ]]; then
+    local paccache_time="$(date -r /var/cache/zsh/pacman +%s%N)"
+    if (( zshcache_time < paccache_time )); then
+      rehash
+      zshcache_time="$paccache_time"
+    fi
+  fi
 }
-trap catch_signal_usr1 USR1
+
+add-zsh-hook -Uz precmd rehash_precmd