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eww: show tdp graph
author
lassulus
date
(Dec 18, 2025, 9:24 PM CET)
commit
5ff1973e
5ff1973e35427971218a2b8eb8f8a5ede8824111
parent
5ea36888
5ea3688805c6226b5f5a536a389b02ac52d56d8d
+113
+113
2configs/desktops/sway/eww.nix
+113
2configs/desktops/sway/eww.nix
···
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(defpoll cpu-freq :interval "2s" :initial 0 "${lib.getExe cpuFreqScript}")
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(defpoll cpu-load :interval "2s" :initial "0.00" "cut -d' ' -f1 /proc/loadavg")
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(defpoll temperature :interval "2s" :initial '{"temp": 0, "fan": 0}' "${lib.getExe tempScript}")
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(defpoll power :interval "2s" :initial '{"watts": 0, "charging": false}' "${lib.getExe powerScript}")
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(defpoll battery :interval "10s" :initial '{"capacity": "100", "icon": "", "watts": "0", "time_remaining": "--", "status": "Full"}' "${lib.getExe batteryScript}")
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(defpoll volume :interval "1s" :initial '{"level": "0", "icon": ""}' "${lib.getExe volumeScript}")
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(defpoll network :interval "5s" :initial " ..." "${lib.getExe networkScript}")
···
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(graph-widget :value {EWW_CPU.avg} :icon "" :class "cpu" :unit "%" :tooltip "Load: ''${cpu-load} | ''${cpu-freq} MHz")
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(graph-widget :value {EWW_RAM.used_mem_perc} :icon "" :class "memory" :unit "%")
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(graph-widget :value {temperature.temp} :icon "" :class "temp" :unit "°" :tooltip "Fan: ''${temperature.fan} RPM")
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(power-graph-widget)
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(brightness-widget)
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(battery-widget)
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(idle-inhibitor)
···
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(box :class "battery" :orientation "h" :space-evenly false
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:tooltip "''${battery.watts}W | ''${battery.time_remaining} ''${battery.status == 'Charging' ? 'to full' : 'remaining'}"
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(label :text "''${battery.capacity}% ''${battery.icon}")))
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(defwidget power-graph-widget []
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(box :class {power.charging ? "graph-module power charging" : "graph-module power"} :orientation "h" :space-evenly false :spacing 4
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:tooltip "''${battery.time_remaining} ''${battery.status == 'Charging' ? 'to full' : 'remaining'}"
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(graph :class "graph"
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:value {power.watts}
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:thickness 3
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:time-range "60s"
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:min 0
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:max 45
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:dynamic false
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:line-style "round"
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:width 75)
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(label :text "''${round(power.watts, 1)}W ''${power.charging ? '' : ''}")))
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(defwidget volume-widget []
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(box :class "volume" :orientation "h" :space-evenly false
···
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background-color: #ff9e64;
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color: #1a1b26;
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}
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&.power {
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background-color: #f7768e;
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color: #1a1b26;
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&.charging {
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background-color: #9ece6a;
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}
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}
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}
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.graph {
···
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'';
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};
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powerScript = pkgs.writeShellApplication {
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name = "eww-power";
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runtimeInputs = [
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pkgs.jq
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pkgs.bc
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];
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text = ''
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# Use RAPL for actual system power consumption (works on Intel and AMD Zen)
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# Falls back to battery power_now if RAPL unavailable
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state_file="/tmp/eww-power-state"
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rapl_path="/sys/class/powercap/intel-rapl:0/energy_uj"
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# Check charging status
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charging="false"
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for p in /sys/class/power_supply/BAT* /sys/class/power_supply/BATT*; do
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if [ -f "$p/status" ]; then
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status=$(cat "$p/status" 2>/dev/null || echo "Unknown")
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if [ "$status" = "Charging" ]; then
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charging="true"
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fi
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break
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fi
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done
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# Try RAPL first (gives actual system power regardless of charging state)
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if [ -r "$rapl_path" ]; then
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current_energy=$(cat "$rapl_path")
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current_time=$(date +%s%N)
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if [ -f "$state_file" ]; then
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read -r prev_energy prev_time < "$state_file"
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# Calculate power from energy difference
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energy_diff=$((current_energy - prev_energy))
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time_diff=$((current_time - prev_time))
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# Handle counter wrap-around
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if [ "$energy_diff" -lt 0 ]; then
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max_energy=$(cat /sys/class/powercap/intel-rapl:0/max_energy_range_uj 2>/dev/null || echo 0)
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energy_diff=$((energy_diff + max_energy))
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fi
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if [ "$time_diff" -gt 0 ]; then
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# energy_diff is in microjoules, time_diff is in nanoseconds
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# watts = microjoules / (nanoseconds / 1e9) / 1e6 = microjoules * 1000 / nanoseconds
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watts=$(echo "scale=1; $energy_diff * 1000 / $time_diff" | bc)
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else
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watts="0"
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fi
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else
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watts="0"
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fi
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# Save current state
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echo "$current_energy $current_time" > "$state_file"
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jq -n --argjson watts "$watts" --argjson charging "$charging" '{watts: $watts, charging: $charging}'
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exit 0
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fi
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# Fallback: use battery power_now (only accurate when discharging)
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bat_path=""
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for p in /sys/class/power_supply/BAT* /sys/class/power_supply/BATT*; do
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if [ -f "$p/power_now" ]; then
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bat_path="$p"
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break
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fi
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done
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if [ -z "$bat_path" ]; then
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echo '{"watts": 0, "charging": false}'
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exit 0
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fi
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power_now=$(cat "$bat_path/power_now" 2>/dev/null || echo 0)
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watts=$(echo "scale=1; $power_now / 1000000" | bc)
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jq -n --argjson watts "$watts" --argjson charging "$charging" '{watts: $watts, charging: $charging}'
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'';
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};
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batteryScript = pkgs.writeShellApplication {
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name = "eww-battery";
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runtimeInputs = [
···
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hours=$(echo "scale=2; $energy_now / $power_now" | bc)
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fi
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# Convert to hours:minutes
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# Note: bc outputs ".76" for values < 1, so cut returns empty string
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h=$(echo "$hours" | cut -d. -f1)
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h=''${h:-0} # Default to 0 if empty (i.e., less than 1 hour)
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m=$(echo "scale=0; ($hours - $h) * 60 / 1" | bc)
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time_remaining="''${h}h ''${m}m"
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else
···
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in
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{
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# Make RAPL energy counters readable for power monitoring
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# Works on both Intel and AMD Zen CPUs (via intel_rapl_msr module)
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services.udev.extraRules = ''
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SUBSYSTEM=="powercap", ACTION=="add", RUN+="${pkgs.coreutils}/bin/chmod a+r /sys/class/powercap/%k/energy_uj"
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'';
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# eww daemon
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systemd.user.services.eww = {
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description = "ElKowars Wacky Widgets daemon";