From 870172d69230ad2cf0f409ec009ab3feaa723fee Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Sat, 24 Jan 2015 21:14:50 -0500
Subject: [PATCH] Add get with default to dictionary interface.

---
 src/hope.app.src               |  2 +-
 src/hope_gen_dictionary.erl    |  3 +++
 src/hope_kv_list.erl           |  7 +++++++
 test/hope_dictionary_SUITE.erl | 16 ++++++++++++++--
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/src/hope.app.src b/src/hope.app.src
index 051e619..3de6e3d 100644
--- a/src/hope.app.src
+++ b/src/hope.app.src
@@ -1,7 +1,7 @@
 {application, hope,
  [
   {description, "Higher Order Programming in Erlang"},
-  {vsn, "2.0.1"},
+  {vsn, "2.1.0"},
   {registered, []},
   {applications, [
                   kernel,
diff --git a/src/hope_gen_dictionary.erl b/src/hope_gen_dictionary.erl
index 0d45ecd..dda6eb0 100644
--- a/src/hope_gen_dictionary.erl
+++ b/src/hope_gen_dictionary.erl
@@ -15,6 +15,9 @@
 -callback get(t(K, V), K) ->
     hope_option:t(V).
 
+-callback get(t(K, V), K, V) ->
+    V.
+
 -callback set(t(K, V), K, V) ->
     t(K, V).
 
diff --git a/src/hope_kv_list.erl b/src/hope_kv_list.erl
index be11c31..d9a8177 100644
--- a/src/hope_kv_list.erl
+++ b/src/hope_kv_list.erl
@@ -12,6 +12,7 @@
 -export(
     [ empty/0
     , get/2
+    , get/3
     , set/3
     , update/3
     , pop/2
@@ -53,6 +54,12 @@ get(T, K) ->
     ;   {K, V} -> {some, V}
     end.
 
+-spec get(t(K, V), K, V) ->
+    V.
+get(T, K, Default) ->
+    Vopt = get(T, K),
+    hope_option:get(Vopt, Default).
+
 -spec set(t(K, V), K, V) ->
     t(K, V).
 set(T, K, V) ->
diff --git a/test/hope_dictionary_SUITE.erl b/test/hope_dictionary_SUITE.erl
index 914ae48..4f355ca 100644
--- a/test/hope_dictionary_SUITE.erl
+++ b/test/hope_dictionary_SUITE.erl
@@ -1,7 +1,5 @@
 -module(hope_dictionary_SUITE).
 
--include_lib("proper/include/proper.hrl").
-
 %% Callbacks
 -export(
     [ all/0
@@ -14,6 +12,7 @@
 -export(
     [ t_set_new/1
     , t_set_existing/1
+    , t_get/1
     , t_pop/1
     , t_fold/1
     , t_dictionary_specs/1
@@ -35,6 +34,7 @@ groups() ->
     Tests =
         [ t_set_new
         , t_set_existing
+        , t_get
         , t_pop
         , t_fold
         , t_dictionary_specs
@@ -53,6 +53,18 @@ end_per_group(_DictModule, _Cfg) ->
 %%  Test cases
 %% =============================================================================
 
+t_get(Cfg) ->
+    {some, DictModule} = hope_kv_list:get(Cfg, ?DICT_MODULE),
+    K1 = k1,
+    K2 = k2,
+    V1 = v1,
+    V2 = v2,
+    D = DictModule:set(DictModule:empty(), K1, V1),
+    {some, V1} = DictModule:get(D, K1),
+    V1         = DictModule:get(D, K1, V2),
+    none       = DictModule:get(D, K2),
+    V2         = DictModule:get(D, K2, V2).
+
 t_set_new(Cfg) ->
     {some, DictModule} = hope_kv_list:get(Cfg, ?DICT_MODULE),
     Key           = key,
-- 
2.20.1