1 files changed, 54 insertions, 0 deletions
diff --git a/awesome/.config/awesome/lain/widget/contrib/redshift.lua b/awesome/.config/awesome/lain/widget/contrib/redshift.lua
new file mode 100644
index 0000000..d91d941
--- /dev/null
+++ b/awesome/.config/awesome/lain/widget/contrib/redshift.lua
@@ -0,0 +1,54 @@
+--[[
+
+     Licensed under GNU General Public License v2
+      * (c) 2017, Luca CPZ
+      * (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