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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                                                   
7 --]]
8
9 local debug  = require("debug")
10
11 local capi   = { timer = timer }
12 local io     = { open = io.open,
13                  lines = io.lines }
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 -- {{{ File operations
34
35 -- see if the file exists and is readable
36 function helpers.file_exists(file)
37   local f = io.open(file)
38   if f then
39       local s = f:read()
40       f:close()
41       f = s
42   end
43   return f ~= nil
44 end
45
46 -- get all lines from a file, returns an empty 
47 -- list/table if the file does not exist
48 function helpers.lines_from(file)
49   if not helpers.file_exists(file) then return {} end
50   lines = {}
51   for line in io.lines(file) do 
52     lines[#lines + 1] = line
53   end
54   return lines
55 end
56
57 -- get first line of a file, return nil if
58 -- the file does not exist
59 function helpers.first_line(file)
60     return helpers.lines_from(file)[1]
61 end
62
63 -- get first non empty line from a file,
64 -- returns nil otherwise
65 function helpers.first_nonempty_line(file)
66   for k,v in pairs(helpers.lines_from(file)) do
67     if #v then return v end 
68   end
69   return nil
70 end
71
72 -- }}}
73
74 -- {{{ Timer maker
75
76 helpers.timer_table = {}
77
78 function helpers.newtimer(name, timeout, fun, nostart)
79     helpers.timer_table[name] = capi.timer({ timeout = timeout })
80     helpers.timer_table[name]:connect_signal("timeout", fun)
81     helpers.timer_table[name]:start()
82     if not nostart then
83         helpers.timer_table[name]:emit_signal("timeout")
84     end
85 end
86
87 -- }}}
88
89 -- {{{ A map utility
90
91 helpers.map_table = {}
92
93 function helpers.set_map(element, value)
94     helpers.map_table[element] = value
95 end
96
97 function helpers.get_map(element)
98     return helpers.map_table[element]
99 end
100
101 -- }}}
102
103 return helpers