zsh: add pacman module

functions/pacman.zsh

@@ -0,0 +1,9 @@
+if ! command -v pacman &>/dev/null; then return; fi
+
+function pacpreview() {
+    if ! command -v fzf &>/dev/null; then
+        echo "Requires fzf! Quitting"
+        return 1
+    fi
+    pacman -Slq | fzf --multi --preview 'grc --colour=on pacman -Si {1}' | xargs -ro sudo pacman -S
+}