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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 awful        = require("awful")
10 local os           = os
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 local function init()
25     -- As there is no way to determine if redshift was previously
26     -- toggled off (i.e Awesome on-the-fly restart), kill redshift to make sure
27     os.execute("pkill redshift")
28     -- Remove existing color adjustment
29     spawn("redshift -x")
30     -- (Re)start redshift
31     spawn("redshift")
32     running = true
33     active = true
34 end
35
36 function redshift:toggle()
37     if running then
38         -- Sending -USR1 toggles redshift (See project website)
39         os.execute("pkill -USR1 redshift")
40         active = not active
41     else
42         init()
43     end
44     update_fnct()
45 end
46
47 function redshift:off()
48     if running and active then
49         redshift:toggle()
50     end
51 end
52
53 function redshift:on()
54     if not active then
55         redshift:toggle()
56     end
57 end
58
59 function redshift:is_active()
60     return active
61 end
62
63 -- Attach to a widget
64 -- Provides a button which toggles redshift on/off on click
65 -- @param widget:  Widget to attach to.
66 -- @param fnct:    Function to be run each time redshift is toggled (optional).
67 --                 Use it to update widget text or icons on status change.
68 function redshift:attach(widget, fnct)
69     update_fnct  = fnct or function() end
70     if not attached then
71         init()
72         attached = true
73         update_fnct()
74     end
75     widget:buttons(awful.util.table.join( awful.button({}, 1, function () redshift:toggle() end) ))
76 end
77
78 return setmetatable(redshift, { _call = function(_, ...) return create(...) end })