sb-internet: fix wireguard, refactor

.local/libexec/statusbar/sb-internet

@@ -2,27 +2,38 @@
 
 shift=""
 
-if ls /sys/class/net/wl* 1>/dev/null 2>&1; then
-    for w in /sys/class/net/wl*/; do
-        percent="$(grep "$(basename "$(dirname "$w/operstate")")" /proc/net/wireless | tr -s ' ' | cut -d ' ' -f3 | tr -dc "[:digit:]")"
-        grep -vxq '0x\(1\|9\)003' "$w/flags" && wifi_icon="" || wifi_icon="$(sed "s/up/󰖩/;s/down/󰖪/;s/dormant/󰤯/" "$w/operstate" | tr -d "[:space:]")"
-        printf "%b" "$shift$wifi_icon $percent"
-        shift=" "
-    done
-fi
+# Ethernet
+for if in /sys/class/net/*; do
+    eval "$(cat "$if/uevent")"
+    [ -z "$DEVTYPE" ] || continue
+    printf "%b" "$shift󰈁"
+    shift=" "
+done
 
-if ls /sys/class/net/en* 1>/dev/null 2>&1; then
-    for e in /sys/class/net/e*/operstate; do
-        [ "$(cat "$e")" = "up" ] && printf "%b" "$shift󰈁"
-        shift=" "
-    done
-fi
+# WLAN
+for if in /sys/class/net/*; do
+    eval "$(cat "$if/uevent")"
+    [ "$DEVTYPE" = "wlan" ] || continue
+    if grep -vxq '0x\(1\|9\)003' "$if/flags"; then
+        wifi_icon=""
+    else
+        case "$(cat "$if/operstate")" in
+            up) wifi_icon="󰖩" ;;
+            down) wifi_icon="󰖪" ;;
+            dormant) wifi_icon="󰤯" ;;
+        esac
+    fi
+    percent="$(grep "$INTERFACE" /proc/net/wireless | tr -s ' ' | cut -d ' ' -f3 | tr -dc "[:digit:]")"
+    printf "%b" "$shift$wifi_icon $percent"
+    shift=" "
+done
 
-if ls /sys/class/net/wg* 1>/dev/null 2>&1; then
-    for _ in /sys/class/net/wg*/carrier; do
-        printf "%b" "$shift󰖂"
-        shift=" "
-    done
-fi
+# Wireguard
+for if in /sys/class/net/*; do
+    eval "$(cat "$if/uevent")"
+    [ "$DEVTYPE" = "wireguard" ] || continue
+    printf "%b" "$shift󰖂"
+    shift=" "
+done
 
 printf "\n"