README: Add Installation instructions

[etc/awesome.git] / luatz / tzinfo.lua

diff --git a/luatz/tzinfo.lua b/luatz/tzinfo.lua
index fd3f5e8b88d52339f6054ccd7c6e6b34a9dcb881..75be0f11bb5f4eebc95008b3b190becce0524f76 100644 (file)
--- a/luatz/tzinfo.lua
+++ b/luatz/tzinfo.lua
@@ -1,9 +1,23 @@
 local gettime = require "luatz.gettime".gettime
+local timetable_mt = require "luatz.timetable".timetable_mt
+
+local function to_timestamp ( o )
+       if type ( o ) == "number" then
+               return o
+       elseif getmetatable ( o ) == timetable_mt then
+               return o:timestamp ( )
+       end
+end
 
 local tz_info_methods = { }
 local tz_info_mt = {
        __index = tz_info_methods ;
 }
+local tt_info_mt = {
+       __tostring = function ( self )
+               return string.format ( "tt_info:%s=%d" , self.abbr , self.gmtoff )
+       end ;
+}
 
 -- Binary search
 local function _find_current ( tzinfo , target , i , j )
@@ -52,15 +66,18 @@ local function find_current_local ( tzinfo , ts_local )
 end
 
 function tz_info_methods:find_current ( current )
+       current = assert ( to_timestamp ( current ) , "invalid timestamp to :find_current" )
        return self [ _find_current ( self , current , 0 , #self ) ].info
 end
 
-function tz_info_methods:localize ( utc_ts )
+function tz_info_methods:localise ( utc_ts )
        utc_ts = utc_ts or gettime ( )
        return utc_ts + self:find_current ( utc_ts ).gmtoff
 end
+tz_info_methods.localize = tz_info_methods.localise
 
 function tz_info_methods:utctime ( ts_local )
+       ts_local = assert ( to_timestamp ( ts_local ) , "invalid timestamp to :utctime" )
        local tz1 , tz2 = find_current_local ( self , ts_local )
        tz1 = self [ tz1 ].info
        if tz2 == nil then
@@ -74,4 +91,5 @@ end
 
 return {
        tz_info_mt = tz_info_mt ;
+       tt_info_mt = tt_info_mt ;
 }