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d347e059b9646f8882108caf2427ff2e0361acf8
[etc/awesome.git] / src / tzinfo.lua
1 local gettime = require "luatz.gettime".gettime
2
3 local tz_info_methods = { }
4 local tz_info_mt = {
5         __index = tz_info_methods ;
6 }
7
8 -- Binary search
9 local function _find_current ( tzinfo , target , i , j )
10         if i >= j then return j end
11
12         local half = math.ceil ( (j+i) / 2 )
13
14         if target >= tzinfo [ half ].transition_time then
15                 return _find_current ( tzinfo , target , half , j )
16         else
17                 return _find_current ( tzinfo , target , i , half-1 )
18         end
19 end
20 function tz_info_methods:find_current ( current )
21         return self [ _find_current ( self , current , 0 , #self ) ].info
22 end
23
24 function tz_info_methods:localize ( utc_ts )
25         utc_ts = utc_ts or gettime ( )
26         return utc_ts + self:find_current ( utc_ts ).gmtoff
27 end
28
29 return {
30         tz_info_mt = tz_info_mt ;
31 }