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helpers: powerset and trivial_partition_set
[etc/awesome.git] / widget / contrib / kbdlayout.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2015, Dario Gjorgjevski
5
6 --]]
7
8 local helpers      = require("lain.helpers")
9 local awful        = require("awful")
10 local wibox        = require("wibox")
11 local string       = { format = string.format,
12                        match  = string.match }
13 local execute      = os.execute
14 local setmetatable = setmetatable
15
16 -- Keyboard layout switcher
17 -- lain.widget.contrib.kblayout
18
19 local function factory(args)
20     local kbdlayout        = { widget = wibox.widget.textbox() }
21     local args             = args or {}
22     local layouts          = args.layouts or {}
23     local settings         = args.settings or function () end
24     local add_us_secondary = true
25     local timeout          = args.timeout or 5
26     local idx              = 1
27
28     if args.add_us_secondary == false then add_us_secondary = false end
29
30     local function kbd_run_settings(layout, variant)
31         kbdlayout_now = {
32             layout  = string.match(layout, "[^,]+"), -- Make sure to match the primary layout only.
33             variant = variant
34         }
35         widget = kbdlayout.widget
36         settings()
37     end
38
39     function kbdlayout.update()
40         helpers.async("setxkbmap -query", function(status)
41             kbd_run_settings(string.match(status, "layout:%s*([^\n]*)"),
42             string.match(status, "variant:%s*([^\n]*)"))
43         end)
44     end
45
46     function kbdlayout.set(i)
47         if #layouts == 0 then return end
48         idx = ((i - 1) % #layouts) + 1 -- Make sure to wrap around as needed.
49         local to_execute = "setxkbmap " .. layouts[idx].layout
50
51         if add_us_secondary and not string.match(layouts[idx].layout, ",?us,?") then
52             to_execute = to_execute .. ",us"
53         end
54
55         if layouts[idx].variant then
56             to_execute = to_execute .. " " .. layouts[idx].variant
57         end
58
59         if execute(to_execute) then
60             kbd_run_settings(layouts[idx].layout, layouts[idx].variant)
61         end
62    end
63
64    function kbdlayout.next() kbdlayout.set(idx + 1) end
65    function kbdlayout.prev() kbdlayout.set(idx - 1) end
66
67    -- Mouse bindings
68    kbdlayout.widget:buttons(awful.util.table.join(
69                               awful.button({ }, 1, function () kbdlayout.next() end),
70                               awful.button({ }, 3, function () kbdlayout.prev() end)))
71
72    helpers.newtimer("kbdlayout", timeout, kbdlayout.update)
73
74    return kbdlayout
75 end
76
77 return factory