From 8874e414a80f7f29e3a8c8f00b3887399a7a6cbc Mon Sep 17 00:00:00 2001
From: Tristan Sloughter <t@crashfast.com>
Date: Thu, 19 Feb 2015 08:13:56 -0600
Subject: sort project apps before merging deps

---
 src/rebar_utils.erl | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/rebar_utils.erl')

diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index 85f59d6..943c0d7 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -26,7 +26,8 @@
 %% -------------------------------------------------------------------
 -module(rebar_utils).
 
--export([droplast/1,
+-export([sort_deps/1,
+         droplast/1,
          filtermap/2,
          is_arch/1,
          sh/2,
@@ -56,11 +57,20 @@
 -include("rebar.hrl").
 
 -define(ONE_LEVEL_INDENT, "     ").
+-define(APP_NAME_INDEX, 2).
 
 %% ====================================================================
 %% Public API
 %% ====================================================================
 
+sort_deps(Deps) ->
+    %% We need a sort stable, based on the name. So that for multiple deps on
+    %% the same level with the same name, we keep the order the parents had.
+    %% `lists:keysort/2' is documented as stable in the stdlib.
+    %% The list of deps is revered when we get it. For the proper stable
+    %% result, re-reverse it.
+    lists:keysort(?APP_NAME_INDEX, lists:reverse(Deps)).
+
 droplast(L) ->
     lists:reverse(tl(lists:reverse(L))).
 
-- 
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