bluetooth - only show unregistered devices when scanning to simplify use

Before when looking for devices to pair with, previously registered devices could be shown
which can make it confusing with multiple gamepads with the same name as to which to add

Author: joolswills

scriptmodules/supplementary/bluetooth.sh

@@ -85,22 +85,36 @@ function list_available_bluetooth() {
     local device_name
     local info_text="\n\nSearching ..."
 
+    declare -A registered=()
+    declare -A found=()
+
+    # get an asc array of registered mac addresses
+    while read mac_address; read device_name; do
+        registered+=(["$mac_address"]="$device_name")
+    done < <(list_registered_bluetooth)
+
     # sixaxis: add USB pairing information
     [[ -n "$(lsmod | grep hid_sony)" ]] && info_text="Searching ...\n\nDualShock registration: while this text is visible, unplug the controller, press the PS/SHARE button, and then replug the controller."
 
     dialog --backtitle "$__backtitle" --infobox "$info_text" 7 60 >/dev/tty
     if hasPackage bluez 5; then
         # sixaxis: reply to authorization challenge on USB cable connect
         while read mac_address; read device_name; do
-            echo "$mac_address"
-            echo "$device_name"
-        done < <(bluez_cmd_bluetooth "default-agent\nscan on" "15" "Authorize service$" "yes" >/dev/null; bluez_cmd_bluetooth "devices" "3" | grep "^Device " | cut -d" " -f2,3- | sed 's/ /\n/')
+            found+=(["$mac_address"]="$device_name")
+       done < <(bluez_cmd_bluetooth "default-agent\nscan on" "15" "Authorize service$" "yes" >/dev/null; bluez_cmd_bluetooth "devices" "3" | grep "^Device " | cut -d" " -f2,3- | sed 's/ /\n/')
     else
         while read; read mac_address; read device_name; do
-            echo "$mac_address"
-            echo "$device_name"
+            found+=(["$mac_address"]="$device_name")
         done < <(hcitool scan --flush | tail -n +2 | sed 's/\t/\n/g')
     fi
+
+    # display any found addresses that are not already registered
+    for mac_address in "${!found[@]}"; do
+        if [[ -z "${registered[$mac_address]}" ]]; then
+            echo "$mac_address"
+            echo "${found[$mac_address]}"
+        fi
+    done
 }
 
 function list_registered_bluetooth() {