waybar: use iwd D-Bus + /proc for wifi instead of scraping iwctl

Replace iwctl ANSI-stripping with busctl calls against net.connman.iwd
(a formally stable, documented D-Bus API) to get state and SSID, and
read signal strength directly from /proc/net/wireless. No more parser
fragility if iwctl's human-readable layout changes.

1 files changed, 35 insertions, 18 deletions

diff --git a/dot_config/waybar/executable_wifi-status.sh b/dot_config/waybar/executable_wifi-status.sh
index e69e5bb..eae2ff3 100755
--- a/dot_config/waybar/executable_wifi-status.sh
+++ b/dot_config/waybar/executable_wifi-status.sh
@@ -1,27 +1,44 @@
 #!/bin/sh
-# Emit waybar JSON describing wifi link state. Uses iwctl (from iwd) so we
-# don't need the separate `iw` package. Handles bond-slaved wlan where
-# waybar's built-in network module fails to detect wifi.
+# Emit waybar JSON describing wifi link state.
+#
+# Uses iwd's D-Bus API for state + SSID (net.connman.iwd is a documented,
+# stable interface) and /proc/net/wireless for signal strength. No reliance
+# on iwctl's human-readable TTY output.
 set -eu
 
 iface=wlan0
+svc=net.connman.iwd
 
-# iwctl emits ANSI colour codes even when stdout is a pipe; strip them.
-out=$(iwctl station "$iface" show 2>/dev/null | sed 's/\x1b\[[0-9;]*[a-zA-Z]//g' || true)
+down() {
+	printf '{"text":"wifi off","class":"down"}\n'
+	exit 0
+}
 
-state=$(printf '%s\n' "$out" | awk '/ State / {print $NF; exit}')
-if [ "$state" != "connected" ]; then
-  printf '{"text":"wifi off","class":"down"}\n'
-  exit 0
-fi
+# Locate the iwd object path for this interface.
+station=$(busctl --system --json=short call "$svc" / \
+	org.freedesktop.DBus.ObjectManager GetManagedObjects 2>/dev/null |
+	jq -r --arg iface "$iface" '
+      (.data[0] // .data) as $objs
+      | $objs | to_entries[]
+      | select(.value["net.connman.iwd.Device"].Name.data == $iface)
+      | .key' 2>/dev/null || true)
+[ -n "$station" ] || down
 
-ssid=$(printf '%s\n' "$out" |
-  sed -n 's/^[[:space:]]*Connected network[[:space:]]\{2,\}//p' |
-  sed 's/[[:space:]]*$//')
-rssi=$(printf '%s\n' "$out" |
-  sed -n 's/^[[:space:]]*\*\{0,1\}[[:space:]]*AverageRSSI[[:space:]]\{2,\}//p' |
-  awk '{print $1; exit}')
-pct=$(awk -v r="${rssi:-0}" 'BEGIN{p=2*(r+100); if(p>100)p=100; if(p<0)p=0; printf "%d",p}')
+state=$(busctl --system --json=short get-property "$svc" "$station" \
+	net.connman.iwd.Station State 2>/dev/null | jq -r '.data' 2>/dev/null || true)
+[ "$state" = "connected" ] || down
+
+netpath=$(busctl --system --json=short get-property "$svc" "$station" \
+	net.connman.iwd.Station ConnectedNetwork | jq -r '.data')
+ssid=$(busctl --system --json=short get-property "$svc" "$netpath" \
+	net.connman.iwd.Network Name | jq -r '.data')
+
+# /proc/net/wireless: "<iface>: <status> <qual>. <level>. <noise>. ..."
+# We want <level> (column 4), which is dBm. Strip trailing dot.
+rssi=$(awk -v i="$iface:" '$1==i { sub(/\./, "", $4); print $4; exit }' /proc/net/wireless)
+rssi=${rssi:-0}
+
+pct=$(awk -v r="$rssi" 'BEGIN{p=2*(r+100); if(p>100)p=100; if(p<0)p=0; printf "%d",p}')
 color=$(awk -v p="$pct" 'BEGIN{
 	if (p < 20) print "#fb4934"
 	else if (p < 40) print "#fe8019"
@@ -30,4 +47,4 @@ color=$(awk -v p="$pct" 'BEGIN{
 }')
 
 printf '{"text":"%s <span color=\x27%s\x27>%s%%</span>","class":"up","tooltip":"%s · %s dBm"}\n' \
-  "$ssid" "$color" "$pct" "$iface" "$rssi"
+	"$ssid" "$color" "$pct" "$iface" "$rssi"