aboutsummaryrefslogtreecommitdiff
path: root/.config/awesome/lain/helpers.lua
blob: 863bb87b905e7641313bd5db96a07ec9e3288060 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
--[[
                                                  
     Licensed under GNU General Public License v2 
      * (c) 2013,      Luke Bonham                
                                                  
--]]

local debug  = require("debug")

local capi   = { timer = timer }
local io     = { open = io.open,
                 lines = io.lines }
local rawget = rawget

-- Lain helper functions for internal use
-- lain.helpers
local helpers = {}

helpers.lain_dir    = debug.getinfo(1, 'S').source:match[[^@(.*/).*$]]
helpers.icons_dir   = helpers.lain_dir .. 'icons/'
helpers.scripts_dir = helpers.lain_dir .. 'scripts/'

-- {{{ Modules loader

function helpers.wrequire(table, key)
    local module = rawget(table, key)
    return module or require(table._NAME .. '.' .. key)
end

-- }}}

-- {{{ File operations

-- see if the file exists and is readable
function helpers.file_exists(file)
  local f = io.open(file)
  if f then
      local s = f:read()
      f:close()
      f = s
  end
  return f ~= nil
end

-- get all lines from a file, returns an empty 
-- list/table if the file does not exist
function helpers.lines_from(file)
  if not helpers.file_exists(file) then return {} end
  lines = {}
  for line in io.lines(file) do 
    lines[#lines + 1] = line
  end
  return lines
end

-- get first line of a file, return nil if
-- the file does not exist
function helpers.first_line(file)
    return helpers.lines_from(file)[1]
end

-- get first non empty line from a file,
-- returns nil otherwise
function helpers.first_nonempty_line(file)
  for k,v in pairs(helpers.lines_from(file)) do
    if #v then return v end 
  end
  return nil
end

-- }}}

-- {{{ Timer maker

helpers.timer_table = {}

function helpers.newtimer(name, timeout, fun, nostart)
    helpers.timer_table[name] = capi.timer({ timeout = timeout })
    helpers.timer_table[name]:connect_signal("timeout", fun)
    helpers.timer_table[name]:start()
    if not nostart then
        helpers.timer_table[name]:emit_signal("timeout")
    end
end

-- }}}

-- {{{ A map utility

helpers.map_table = {}

function helpers.set_map(element, value)
    helpers.map_table[element] = value
end

function helpers.get_map(element)
    return helpers.map_table[element]
end

-- }}}

return helpers