--- /dev/null
+
+--[[
+
+ Licensed under GNU General Public License v2
+ * (c) 2014, blueluke <http://github.com/blueluke>
+
+--]]
+
+local async = require("lain.helpers").async
+local awful = require("awful")
+local execute = os.execute
+local type = type
+
+-- Redshift
+-- lain.widget.contrib.redshift
+local redshift = { active = false, pid = nil }
+
+function redshift:start()
+ execute("pkill redshift")
+ awful.spawn.with_shell("redshift -x") -- clear adjustments
+ redshift.pid = awful.spawn.with_shell("redshift")
+ redshift.active = true
+ if type(redshift.update_fun) == "function" then
+ redshift.update_fun(redshift.active)
+ end
+end
+
+function redshift:toggle()
+ async({ awful.util.shell, "-c", string.format("ps -p %d -o pid=", redshift.pid) }, function(f)
+ if f and #f > 0 then -- redshift is running
+ -- Sending -USR1 toggles redshift (See project website)
+ execute("pkill -USR1 redshift")
+ redshift.active = not redshift.active
+ else -- not started or killed, (re)start it
+ redshift:start()
+ end
+ redshift.update_fun(redshift.active)
+ end)
+end
+
+-- Attach to a widget
+-- Provides a button which toggles redshift on/off on click
+-- @param widget: Widget to attach to.
+-- @param fun: Function to be run each time redshift is toggled (optional).
+-- Use it to update widget text or icons on status change.
+function redshift:attach(widget, fun)
+ redshift.update_fun = fun or function() end
+ if not redshift.pid then redshift:start() end
+ if widget then
+ widget:buttons(awful.util.table.join(awful.button({}, 1, function () redshift:toggle() end)))
+ end
+end
+
+return redshift