Streamline monitors_exist with usb_devices_exist

.local/bin/xmonconf

@@ -65,15 +65,20 @@ monitor_exist() {
 # monitors_exist checks if the specified monitors are connected to the system
 # $1..$n: The monitor names to search for
 monitors_exist() {
-    local monitor
+    local monitor matches=0
 
     for monitor in "$@"; do
-        if ! monitor_exist "$monitor"; then
-            return 1
+        if monitor_exist "$monitor"; then
+            echo "$monitor"
+            matches=$((matches + 1))
         fi
     done
 
-    echo "Monitors exist: ${*}"
+    if [ "$matches" -ne "$#" ]; then
+        echo "Amount of devices does not match the amount of arguments" 1>&2
+        return 1
+    fi
+
     return 0
 }
 
@@ -303,7 +308,7 @@ main() {
 
         for monitor in "${monitors[@]}"; do
             IFS=',' read -r -a monitor_array <<<"$monitor"
-            if monitors_exist "${monitor_array[@]}"; then
+            if monitors_exist "${monitor_array[@]}" >/dev/null; then
                 echo "Applying dock profile for ${monitor_array[*]}"
                 xrandr \
                     --output "${monitor_array[0]}" --mode 1920x1200 --rotate normal --pos 1200x1474 --primary \