Merge pull request #1 from Joe-noh/joe-noh-file-path

use relative path

lib/countries.ex

@@ -1,49 +1,53 @@
 defmodule Countries do
   alias Countries.Country, as: Country
-  
+
   @doc """
   Returns all countries.
   """
   def all do
     countries
   end
-  
+
   @doc """
   Filters countries by given attribute.
   Returns a List of %Country{}
-  
+
   ## Examples
     iex> Countries.filter_by(:region, "Europe")
     [%Countries.Country{address_format: nil, alpha2: 'VA' ...
   """
   def filter_by(attribute, value) do
-    Enum.filter(countries, fn(country) -> 
+    Enum.filter(countries, fn(country) ->
       value_as_char_list = to_char_list(value)
       country[attribute] == value_as_char_list
     end)
   end
 
-  defp countries do 
+  defp countries do
     # Lets load all country data from our yaml files
-    codes = List.first(:yamerl.decode_file("lib/data/countries.yaml"))
-    country_data = 
-      Enum.reduce(codes, [], fn (code, countries) -> 
-        countries ++ :yamerl.decode_file("lib/data/countries/#{code}.yaml") 
+    codes = List.first(:yamerl.decode_file(data_path "countries.yaml"))
+    country_data =
+      Enum.reduce(codes, [], fn (code, countries) ->
+        countries ++ :yamerl.decode_file(data_path "countries/#{code}.yaml")
       end)
-      
-    # :yamerl returns a really terrible data structure 
+
+    # :yamerl returns a really terrible data structure
     #    [[{'name', 'Germany'}, {'code', 'DE'}], [{'nam:e', 'Austria'}, {'code', 'AT'}]]
     # We need to transform that to maps:
     #    [%{name: 'Germany', code: "DE"}, %{name: 'Austria', code: "AT"}]
-    countries = 
+    countries =
       Enum.reduce(country_data, [], fn (country_data, countries) ->
-        country = 
+        country =
           Enum.reduce(country_data, %Country{}, fn({key, value}, country) ->
             key_as_atom = String.to_atom(to_string key)
             Map.put(country, key_as_atom, value)
           end)
-          
+
         List.insert_at(countries, 0, country)
       end)
   end
+
+  defp data_path(path) do
+    Path.join("data", path) |> Path.expand(__DIR__)
+  end
 end