[iface] refactoring

i3blocks.conf

@@ -87,8 +87,8 @@ interval=30
 # instance=eth0
 # instance=wlp2s0
 color=#00FF00
-# interval=10
-interval=once
+interval=10
+# interval=once
 separator=false
 
 # [wifi]

scripts/i3blocks/iface

@@ -19,11 +19,11 @@
 #------------------------------------------------------------------------
 
 # Use the provided interface, otherwise the device used for the default route.
-if [[ -z $IF ]] && [[ -n $BLOCK_INSTANCE ]]; then
-    IF=$BLOCK_INSTANCE
-elif [[ -z $IF ]]; then
-    IF=$(ip route | awk '/^default/ { print $5 ; exit }')
-fi
+IF="${IFACE:-$BLOCK_INSTANCE}"
+IF="${IF:-$(ip route | awk '/^default/ { print $5 ; exit }')}"
+
+# Exit if there is no default route
+[[ -z "$IF" ]] && exit
 
 #------------------------------------------------------------------------
 
@@ -33,21 +33,30 @@ fi
 
 #------------------------------------------------------------------------
 
-if [[ "$(cat "/sys/class/net/$IF/operstate")" = 'down' ]]; then
-    echo down # full text
-    echo down # short text
-    echo \#FF0000 # color
-    exit
-fi
+AF=${ADDRESS_FAMILY:-inet6?}
+LABEL="${LABEL:-}"
 
-case $1 in
+for flag in "$1" "$2"; do
+    case "$flag" in
         -4)
             AF=inet ;;
         -6)
             AF=inet6 ;;
-    *)
-        AF=inet6? ;;
+        -L)
+            if [[ "$IF" = "" ]]; then
+                LABEL="iface "
+            else
+                LABEL="$IF: "
+            fi ;;
     esac
+done
+
+if [[ "$IF" = "" ]] || [[ "$(cat "/sys/class/net/$IF/operstate")" = 'down' ]]; then
+    echo "${LABEL}down" # full text
+    echo "${LABEL}down" # short text
+    echo \#FF0000 # color
+    exit
+fi
 
 # look for the vpn connection, if no interface is found, use the first device with a global scope
 if [[ $(ip addr show tun0) ]]; then
@@ -62,5 +71,5 @@ esac
 
 #------------------------------------------------------------------------
 
-echo "$IPADDR" # full text
-echo "$IPADDR" # short text
+echo "$LABEL$IPADDR" # full text
+echo "$LABEL$IPADDR" # short text