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[etc/awesome.git] / widgets / contrib / redshift.lua
1
2 --[[
3                                                    
4      Licensed under GNU General Public License v2  
5       * (c) 2014, blueluke <http://github.com/blueluke>
6                                                    
7 --]]
8
9 local os = os
10 local awful = require("awful")
11 local spawn = awful.util.spawn_with_shell
12
13 local setmetatable = setmetatable
14
15 -- redshift
16 -- lain.widgets.contrib.redshift
17 local redshift = {}
18
19 local attached = false                       -- true if attached to a widget
20 local active = false                         -- true if redshift is active            
21 local running = false                        -- true if redshift was initialized 
22 local update_fnct = function() end           -- function that is run each time redshift is toggled. See redshift:attach().
23
24
25 local function init()
26     -- As there is no way to determine if redshift was previously
27     -- toggled off (i.e Awesome on-the-fly restart), kill redshift to make sure
28     os.execute("pkill redshift")
29     -- Remove existing color adjustment
30     spawn("redshift -x")
31     -- (Re)start redshift
32     spawn("redshift")
33     running = true
34     active = true
35 end
36
37 function redshift:toggle()
38     if running then 
39         -- Sending -USR1 toggles redshift (See project website)
40         os.execute("pkill -USR1 redshift")
41         active = not active
42     else 
43         init()
44     end
45     update_fnct()
46 end
47
48 function redshift:off()
49     if running and active then
50         redshift:toggle()
51     end
52 end
53
54 function redshift:on()
55     if not active then
56         redshift:toggle()
57     end
58 end
59
60 function redshift:is_active()
61     return active
62 end
63
64 -- Attach to a widget
65 -- Provides a button which toggles redshift on/off on click
66 -- @ param widget:  widget to attach to
67 -- @ param fnct:  function to be run each time redshift is toggled (optional).
68 --                         Use it to update widget text or icons on status change.
69 function redshift:attach(widget, fnct)
70     update_fnct  = fnct or function() end
71     if not attached then
72         init()
73         attached = true
74         update_fnct()
75     end
76     widget:buttons(awful.util.table.join( awful.button({}, 1, function () redshift:toggle() end) ))
77 end
78
79 return setmetatable(redshift, { _call = function(_, ...) return create(...) end })