Produce notifications when users join the mesh

src/zeronetavahi

@@ -76,6 +76,9 @@ ZERONET_ID_STR="ZeroNet ID Service"
 TEMPFILE_BASE=$(mktemp /tmp/zeronetavahibase.XXXXXX)
 TEMPFILE=$(mktemp /tmp/zeronetavahi.XXXXXX)
 
+# List of tox users previously seen
+PREV_TOX_USERS_FILE=/root/.prev_tox_users
+
 function ipfs_bootstrap {
     cat $TEMPFILE_BASE | grep "IPFS\|hostname =\|address =\|port =\|txt =" > $TEMPFILE
 
@@ -108,10 +111,40 @@ function ipfs_bootstrap {
     done < "$TEMPFILE"
 }
 
+function detect_new_tox_users {
+    CURRENT_USERS_FILE=$1
+
+    if [ ! -f $CURRENT_USERS_FILE ]; then
+        return
+    fi
+
+    # Check that this is a GUI installation with a desktop
+    if [ ! -d /home/fbone/Desktop ]; then
+        return
+    fi
+
+    # Produce notifications if new users appear
+    if [ -f $PREV_TOX_USERS_FILE ]; then
+        while IFS='' read -r line || [[ -n "$line" ]]; do
+            if ! grep -q "$line" $PREV_TOX_USERS_FILE; then
+                # get the nick of the user
+                toxuser="$(echo "$line" | awk -F ' ' '{print $1}')"
+
+                notify-send $"$PROJECT_NAME mesh" $"$toxuser has joined the mesh" --icon=dialog-information
+            fi
+        done < "$CURRENT_USERS_FILE"
+    fi
+
+    # Store the previous tox users list
+    cp -f $CURRENT_USERS_FILE $PREV_TOX_USERS_FILE
+}
+
 function detect_tox_users {
     # don't show the first peer field
     lstox | awk -F ' ' '{$1=""; print $0}' | sed -e 's/^[[:space:]]*//' | sort -d > $TEMPFILE
 
+    detect_new_tox_users $TEMPFILE
+
     toxctr=0
     echo '<ol type="square">' >> $TOX_USERS_FILE.new
     while IFS='' read -r line || [[ -n "$line" ]]; do