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[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
12 local capi   = { timer = timer }
13 local io     = { open = io.open }
14 local rawget = rawget
15
16 -- Lain helper functions for internal use
17 -- lain.helpers
18 local helpers = {}
19
20 helpers.lain_dir    = debug.getinfo(1, 'S').source:match[[^@(.*/).*$]]
21 helpers.icons_dir   = helpers.lain_dir .. 'icons/'
22 helpers.scripts_dir = helpers.lain_dir .. 'scripts/'
23
24 -- {{{ Modules loader
25
26 function helpers.wrequire(table, key)
27     local module = rawget(table, key)
28     return module or require(table._NAME .. '.' .. key)
29 end
30
31 -- }}}
32
33 -- {{{ Read the first line of a file or return nil
34
35 function helpers.first_line(f)
36     local fp = io.open(f)
37     if not fp
38     then
39         return nil
40     end
41
42     local content = fp:read("*l")
43     fp:close()
44     return content
45 end
46
47 -- }}}
48
49 -- {{{ Timer maker
50
51 helpers.timer_table = {}
52
53 function helpers.newtimer(name, timeout, fun, nostart)
54     helpers.timer_table[name] = capi.timer({ timeout = timeout })
55     helpers.timer_table[name]:connect_signal("timeout", fun)
56     helpers.timer_table[name]:start()
57     if not nostart then
58         helpers.timer_table[name]:emit_signal("timeout")
59     end
60 end
61
62 -- }}}
63
64 -- {{{ A map utility
65
66 helpers.map_table = {}
67
68 function helpers.set_map(element, value)
69     helpers.map_table[element] = value
70 end
71
72 function helpers.get_map(element)
73     return helpers.map_table[element]
74 end
75
76 -- }}}
77
78 return helpers