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a8c4cd7297bc01c830c06c4df98e0d5e05b1780a
[etc/awesome.git] / helpers.lua
1
2 --[[
3                                                       
4      Licensed under GNU General Public License v2     
5       * (c) 2013,      Luke Bonham                    
6       * (c) 2010-2012, Peter Hofmann                  
7                                                       
8 --]]
9
10 local debug  = require("debug")
11 local rawget = rawget
12 local io     = { open = io.open }
13
14 -- Lain helper functions for internal use
15 -- lain.helpers
16 local helpers = {}
17
18 helpers.lain_dir    = debug.getinfo(1, 'S').source:match[[^@(.*/).*$]]
19 helpers.icons_dir   = helpers.lain_dir .. 'icons/'
20 helpers.scripts_dir = helpers.lain_dir .. 'scripts/'
21
22 -- {{{ Modules loader
23
24 function helpers.wrequire(table, key)
25     local module = rawget(table, key)
26     return module or require(table._NAME .. '.' .. key)
27 end
28
29 -- }}}
30
31 -- {{{ Read the first line of a file or return nil.
32
33 function helpers.first_line(f)
34     local fp = io.open(f)
35     if not fp
36     then
37         return nil
38     end
39
40     local content = fp:read("*l")
41     fp:close()
42     return content
43 end
44
45 -- }}}
46
47 -- {{{ Timer maker 
48
49 helpers.timer_table = {}
50
51 function helpers.newtimer(name, timeout, fun, nostart)
52     helpers.timer_table[name] = timer({ timeout = timeout })
53     helpers.timer_table[name]:connect_signal("timeout", fun)
54     helpers.timer_table[name]:start()
55     if not nostart then
56         helpers.timer_table[name]:emit_signal("timeout")
57     end
58 end
59
60 -- }}}
61
62 -- {{{ A map utility
63
64 helpers.map_table = {}
65
66 function helpers.set_map(element, value)
67     helpers.map_table[element] = value
68 end
69
70 function helpers.get_map(element)
71     return helpers.map_table[element]
72 end
73
74 -- }}}
75
76 return helpers