Use dependencies variable to clean up output, also make installing dependencies more reliable by updating the package list if the installation fails the first time

arch_update

@@ -6,13 +6,43 @@ BACKUP_LIMIT=3
 # ---------------- Check dependencies ----------------
 echo -e '\nInstalling dependencies ...' >&2
 if ! which yay >/dev/null 2>&1; then
+    ! which git >/dev/null 2>&1 &&
+        if ! sudo pacman -S --noconfirm git; then
+            if sudo pacman -Syu; then
+                sudo pacman -S --noconfirm git
+            else
+                echo -e '\nUnable to fetch package list. Aborting ...' >&2
+                exit 1
+            fi
+        fi
+
+    cd /tmp
     git clone https://aur.archlinux.org/yay.git
     cd yay
     makepkg -cirs
     cd ..
     rm -fr yay
+    cd
 fi
-yay -S --needed --noconfirm curl git neovim pacman-contrib yaycache
+
+dependencies=
+! which curl >/dev/null 2>&1 && dependencies="$dependencies curl"
+! which git >/dev/null 2>&1 && dependencies="$dependencies git"
+! which neovim >/dev/null 2>&1 && dependencies="$dependencies neovim"
+! which pacman-contrib >/dev/null 2>&1 && dependencies="$dependencies pacman-contrib"
+which btrfs >/dev/null 2>&1 && ! which snapper >/dev/null 2>&1 && dependencies="$dependencies snapper"
+! which yaycache >/dev/null 2>&1 && dependencies="$dependencies yaycache"
+
+[ ! "X$dependencies" = 'X' ] &&
+    if ! yay -S --needed --noconfirm $dependencies; then
+        if yay -Syu; then
+            sudo yay -S --noconfirm git
+        else
+            echo -e '\nUnable to fetch package list. Aborting ...' >&2
+            exit 1
+        fi
+    fi
+
 [ ! -e /usr/local/bin/vim ] && sudo ln -s /usr/bin/nvim /usr/local/bin/vim
 
 # ---------------- Display updates beforehand ----------------
@@ -40,7 +70,6 @@ done
 
 # ---------------- Backup system ----------------
 if which btrfs >/dev/null 2>&1; then
-    yay -S --needed --noconfirm snapper
     [ ! -f /etc/snapper/configs/root ] && sudo snapper -c root create-config /
     [ ! $(sudo awk -F '"' '/NUMBER_LIMIT=/ {print $2}' /etc/snapper/configs/root) -eq $BACKUP_LIMIT ] && sudo sed -i.bak "s/\(NUMBER_LIMIT=\"\).*\"/\1$BACKUP_LIMIT\"/" /etc/snapper/configs/root