init

.config/i3blocks/wlan-dbm/README.md

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+# wlan-dbm
+
+Show wifi interface link quality in dBm or percent.
+
+![](wlan-dbm.png)
+
+# Usage
+
+The block uses dBm by default, set USE_PERCENT=1 to use percent.
+Note, however, that percent is just an estimate that may not accurately predict
+whether you have a good signal.
+
+# Dependencies
+
+* `iw`
+
+# Config
+
+```INI
+[wlan-dbm]
+command=$SCRIPT_DIR/wlan-dbm
+#IFACE=wlan0
+#USE_PERCENT=0
+```

.config/i3blocks/wlan-dbm/wlan-dbm

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+#!/usr/bin/env bash
+#
+# i3blocks blocklet script to display wifi signal in dBm
+
+if [[ -z "$IFACE" ]] ; then
+    IFACE="${BLOCK_INSTANCE:-wlan0}"
+fi
+
+USE_PERCENT=${USE_PERCENT:-0}
+
+IW=$(which iw || echo "/sbin/iw")
+
+if [[ ! -x $IW ]]; then
+	echo "No iw binary was found on the system." 1>2
+	exit 1
+fi
+
+while getopts p opt; do
+    case "$opt" in
+        p) USE_PERCENT=1 ;;
+    esac
+done
+
+dbm=$($IW dev "$IFACE" link | grep 'dBm$' | grep -Eoe '-[0-9]{2}')
+
+[[ -n "$dbm" ]] || exit 1
+
+if [[ $USE_PERCENT -eq 0 ]]; then
+    echo "$dbm" dBm
+    echo "$dbm"
+else
+    if [[ "$dbm" -le -100 ]]; then
+        quality=0
+    elif [[ $dbm -ge -50 ]]; then
+        quality=100
+    else
+        quality=$((2 * (dbm + 100)))
+    fi
+    echo "$quality%"
+    echo "$quality%"
+fi
+
+if [[ $dbm -ge -55 ]]; then
+	echo "#00FF00"
+elif [[ $dbm -ge -60 ]]; then
+	echo "#CCFF00"
+elif [[ $dbm -ge -70 ]]; then
+	echo "#FFFF00"
+elif [[ $dbm -ge -80 ]]; then
+	echo "#FFAA00"
+else
+	echo "#FF0000"
+fi