From b79afea06befb5309f4a3f0388e587e17c484b83 Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Thu, 11 Dec 2014 16:04:17 -0500
Subject: [PATCH] Add labeled result lifting.

---
 src/hope.app.src           |  2 +-
 src/hope_result.erl        | 17 +++++++++++++++++
 test/hope_result_SUITE.erl |  5 ++++-
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/hope.app.src b/src/hope.app.src
index bf3fd3d..3b019ef 100644
--- a/src/hope.app.src
+++ b/src/hope.app.src
@@ -1,7 +1,7 @@
 {application, hope,
  [
   {description, "Higher Order Programming in Erlang"},
-  {vsn, "0.0.0"},
+  {vsn, "1.1.0"},
   {registered, []},
   {applications, [
                   kernel,
diff --git a/src/hope_result.erl b/src/hope_result.erl
index 44f3ddd..feda537 100644
--- a/src/hope_result.erl
+++ b/src/hope_result.erl
@@ -8,6 +8,7 @@
 -export(
     [ pipe/2
     , lift_exn/1
+    , lift_exn/2
     ]).
 
 
@@ -47,3 +48,19 @@ lift_exn(F) when is_function(F, 1) ->
             {error, {Class, Reason}}
         end
     end.
+
+-spec lift_exn(F, Label) -> G
+    when F     :: fun((A)-> B)
+       , G     :: fun((A)-> t(B, {Label, {Class, Reason :: any()}}))
+       , Class :: error
+                | exit
+                | throw
+       .
+lift_exn(F, Label) when is_function(F, 1) ->
+    fun(X) ->
+        try
+            {ok, F(X)}
+        catch Class:Reason ->
+            {error, {Label, {Class, Reason}}}
+        end
+    end.
diff --git a/test/hope_result_SUITE.erl b/test/hope_result_SUITE.erl
index 9587345..390f28c 100644
--- a/test/hope_result_SUITE.erl
+++ b/test/hope_result_SUITE.erl
@@ -90,6 +90,9 @@ t_hope_result_specs(_) ->
 t_lift_exn(_Cfg) ->
     Class = throw,
     Reason = foofoo,
+    Label = bar,
     F = fun (ok) -> apply(erlang, Class, [Reason]) end,
     G = hope_result:lift_exn(F),
-    {error, {Class, Reason}} = G(ok).
+    H = hope_result:lift_exn(F, Label),
+    {error, {Class, Reason}} = G(ok),
+    {error, {Label, {Class, Reason}}} = H(ok).
-- 
2.20.1