[awesome] add redshift widget

home/.config/awesome/rc.lua

@@ -203,6 +203,7 @@ awful.screen.connect_for_each_screen(function(s)
         { -- Right widgets
             layout = wibox.layout.fixed.horizontal,
             wibox.widget.systray(),
+            widgets.redshift,
             widgets.bluetooth,
             widgets.netdown_icon,
             widgets.netdown.widget,
@@ -518,4 +519,3 @@ awful.util.spawn({"nm-applet"})
 awful.util.spawn({"ibus-daemon", "-r", "--xim"})
 awful.util.spawn({"/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1"})
 awful.util.spawn_with_shell("~/bin/spawn-once pasystray")
-awful.util.spawn_with_shell("~/bin/spawn-once redshift-gtk")

home/.config/awesome/widgets.lua

@@ -110,4 +110,32 @@ widgets.bluetooth:buttons(
 
 helpers.newtimer("bluetooth", 10, widgets.bluetooth.update)
 
+widgets.redshift = wibox.widget.imagebox(iconsdir .. "redshift-on.png")
+widgets.redshift.pid = nil
+helpers.async_with_shell("ps x -o pid=,command=|grep -E 'redshift$' |cut -d' ' -f 1", function(pid)
+    if pid and #pid > 0 then
+        widgets.redshift.pid = tonumber(pid)
+    else
+        widgets.redshift.pid = awful.spawn.spawn({ "redshift" })
+    end
+end)
+widgets.redshift.active = true
+
+widgets.redshift.toggle = function()
+    awful.spawn.spawn({ "kill", "-SIGUSR1", tostring(widgets.redshift.pid) })
+    widgets.redshift.active = not widgets.redshift.active
+
+    if widgets.redshift.active == true then
+        widgets.redshift:set_image(iconsdir .. "redshift-on.png")
+    else
+        widgets.redshift:set_image(iconsdir .. "redshift-off.png")
+    end
+end
+
+widgets.redshift:buttons(
+    table.join(
+        awful.button({ }, 1, widgets.redshift.toggle)
+    )
+)
+
 return widgets