Automatic detection of wifi adaptor

src/freedombone-wifi

 COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt
 
 WIFI_INTERFACE=wlan0
+wifi_interface_specified=
 WIFI_TYPE='wpa2-psk'
 WIFI_SSID=
 WIFI_PASSPHRASE=
 NETWORKS_INTERACTIVE=
 WIFI_DISABLE=
 
+IFACE=
+IFACE_SECONDARY=
+
+function update_wifi_adaptors {
+    IFACE=
+    IFACE_SECONDARY=
+
+    for i in $(seq 10 -1 0); do
+        if grep -q "wlan${i}" /proc/net/dev; then
+            if [ ! $IFACE ]; then
+                IFACE="wlan${i}"
+            else
+                IFACE_SECONDARY="wlan${i}"
+                return
+            fi
+        fi
+    done
+}
+
 function wifi_get_psk {
     ssid=$1
     passphrase=$2
 }
 
 function create_networks_interactive {
+    update_wifi_adaptors
+    if [ ! $IFACE ]; then
+        # Don't try to configure wifi if there are no adaptors
+        return
+    fi
+
     if [ -f $WIFI_NETWORKS_FILE ]; then
         rm $WIFI_NETWORKS_FILE
     fi
         -i|--if|--interface)
             shift
             WIFI_INTERFACE=${1}
+            wifi_interface_specified=1
             ;;
         -t|--type)
             shift
     shift
 done
 
+if [ $NETWORKS_INTERACTIVE ]; then
+    create_networks_interactive
+    exit 0
+fi
+
 if [ $WIFI_DISABLE ]; then
     disable_wifi $WIFI_DISABLE
     exit 0
 fi
 
-if [ $NETWORKS_INTERACTIVE ]; then
-    create_networks_interactive
-    exit 0
+if [ ! $wifi_interface_specified= ]; then
+    update_wifi_adaptors
+    if [ ! $IFACE ]; then
+        echo $'No wifi adaptors were found'
+        exit 872356
+    fi
+    WIFI_INTERFACE=$IFACE
 fi
 
 if [ -f $WIFI_NETWORKS_FILE ]; then