making awesome more awesome

awesome/evil/battery.lua

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+-- Provides:
+-- evil::battery
+--      percentage (integer)
+-- evil::charger
+--      plugged (boolean)
+
+local awful = require("awful")
+
+local update_interval = 60
+
+local battery_script = [[
+    sh -c "
+    upower -i $(upower -e | grep BAT) | grep percentage | awk '{print $2}'
+    "
+]]
+
+-- Subscribe to power supply status changes with acpi_listen
+local charger_script = [[
+    sh -c '
+    acpi_listen | grep --line-buffered ac_adapter
+    '
+]]
+
+-- Periodically get battery info
+awful.widget.watch(battery_script, update_interval, function(widget, stdout)
+    local battery = stdout:gsub("%%", "")
+    awesome.emit_signal("evil::battery", tonumber(battery))
+end)
+
+local emit_charger_info = function()
+    awful.spawn.easy_async_with_shell("cat /sys/class/power_supply/*/online", function (out)
+        local status = tonumber(out) == 1
+        awesome.emit_signal("evil::charger", status)
+    end)
+end
+
+-- Run once to initialize widgets
+emit_charger_info()
+
+-- Kill old acpi_listen process
+awful.spawn.easy_async_with_shell("ps x | grep \"acpi_listen\" | grep -v grep | awk '{print $1}' | xargs kill", function ()
+    -- Update charger status with each line printed
+    awful.spawn.with_line_callback(charger_script, {
+        stdout = function(_)
+            emit_charger_info()
+        end
+    })
+end)
+