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pull #239; better implementation
[etc/awesome.git] / widgets / contrib / kbdlayout.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2015, Dario Gjorgjevski               
6                                                   
7 --]]
8
9 local newtimer     = require("lain.helpers").newtimer
10 local read_pipe    = require("lain.helpers").read_pipe
11
12 local wibox        = require("wibox")
13 local awful        = require("awful")
14
15 local string       = { match = string.match }
16
17 local setmetatable = setmetatable
18
19 -- Keyboard layout switcher
20 -- lain.widgets.contrib.kblayout
21
22 local function worker(args)
23    local kbdlayout    = {}
24    kbdlayout.widget   = wibox.widget.textbox('')
25
26    local layouts          = args.layouts
27    local settings         = args.settings or function () end
28    local add_us_secondary = true
29    local timeout          = args.timeout or 5
30    local idx              = 1
31
32    if args.add_us_secondary == false then add_us_secondary = false end
33
34    -- Mouse bindings
35    kbdlayout.widget:buttons(awful.util.table.join(
36                               awful.button({ }, 1, function () kbdlayout.next() end),
37                               awful.button({ }, 3, function () kbdlayout.prev() end)))
38
39    local function run_settings(layout, variant)
40       widget = kbdlayout.widget
41       kbdlayout_now = { layout=string.match(layout, "[^,]+"), -- Make sure to match the primary layout only.
42                         variant=variant }
43       settings()
44    end
45
46    function kbdlayout.update()
47       local status = read_pipe('setxkbmap -query')
48
49       run_settings(string.match(status, "layout:%s*([^\n]*)"),
50                    string.match(status, "variant:%s*([^\n]*)"))
51    end
52
53    function kbdlayout.set(i)
54       idx = ((i - 1) % #layouts) + 1 -- Make sure to wrap around as needed.
55       local to_execute = 'setxkbmap ' .. layouts[idx].layout
56
57       if add_us_secondary and not string.match(layouts[idx].layout, ",?us,?") then
58          to_execute = to_execute .. ",us"
59       end
60
61       if layouts[idx].variant then
62          to_execute = to_execute .. ' ' .. layouts[idx].variant
63       end
64
65       if os.execute(to_execute) then
66          run_settings(layouts[idx].layout, layouts[idx].variant)
67       end
68    end
69
70    function kbdlayout.next()
71       kbdlayout.set(idx + 1)
72    end
73
74    function kbdlayout.prev()
75       kbdlayout.set(idx - 1)
76    end
77
78    newtimer("kbdlayout", timeout, kbdlayout.update)
79    return setmetatable(kbdlayout, { __index = kbdlayout.widget })
80 end
81
82 return setmetatable({}, { __call = function (_, ...) return worker(...) end })