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weather: fix indentation
[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
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 })