refactor(packages): optimize package installation logic to check for existing packages

refactor(shell): enhance TTY keyboard layout setup with existing keymap check
refactor(browsers): improve browser installation script to avoid reinstalling existing packages
refactor(devtools): streamline development tools installation by checking for already installed packages

modules/01-packages.sh

@@ -26,4 +26,16 @@ PACKAGES=(
     # Add more packages here
 )
 
-paru -S --needed --noconfirm "${PACKAGES[@]}"
+to_install=()
+for pkg in "${PACKAGES[@]}"; do
+  if ! paru -Q "$pkg" &>/dev/null; then
+    to_install+=("$pkg")
+  fi
+
+done
+
+if [ "${#to_install[@]}" -gt 0 ]; then
+  paru -S --noconfirm "${to_install[@]}"
+else
+  echo "All packages already installed."
+fi

modules/03-shell.sh

@@ -7,7 +7,12 @@ fi
 
 # Set German nodeadkeys layout for TTY/console
 if command -v localectl >/dev/null 2>&1; then
+    current_keymap=$(localectl status | awk -F': ' '/VC Keymap/ {print $2}' | xargs)
+    if [ "$current_keymap" != "de-latin1-nodeadkeys" ]; then
         echo "Setting TTY keyboard layout to de-latin1-nodeadkeys..."
         sudo localectl set-keymap de-latin1-nodeadkeys
+    else
+        echo "TTY keyboard layout already set to de-latin1-nodeadkeys."
+    fi
 fi
 

modules/07-browsers.sh

@@ -8,6 +8,17 @@ BROWSERS=(google-chrome firefox brave-bin)
 
 # Install browsers with paru (AUR helper)
 echo "Installing browsers: ${BROWSERS[*]}"
-paru -S --needed --noconfirm "${BROWSERS[@]}"
+to_install=()
+for pkg in "${BROWSERS[@]}"; do
+  if ! paru -Q "$pkg" &>/dev/null; then
+    to_install+=("$pkg")
+  fi
 
-echo "Browsers installed."
+done
+
+if [ "${#to_install[@]}" -gt 0 ]; then
+  paru -S --noconfirm "${to_install[@]}"
+  echo "Browsers installed."
+else
+  echo "All browsers already installed."
+fi

modules/50-devtools.sh

@@ -17,6 +17,17 @@ DEVTOOLS_PACKAGES=(
     opencode
 )
 
-paru -S --needed --noconfirm "${DEVTOOLS_PACKAGES[@]}"
+to_install=()
+for pkg in "${DEVTOOLS_PACKAGES[@]}"; do
+  if ! paru -Q "$pkg" &>/dev/null; then
+    to_install+=("$pkg")
+  fi
 
-echo "Development tools installed."
+done
+
+if [ "${#to_install[@]}" -gt 0 ]; then
+  paru -S --noconfirm "${to_install[@]}"
+  echo "Development tools installed."
+else
+  echo "All development tools already installed."
+fi