Add support for rebar3

Allow Jiffy to be used easily in projects using either rebar 2 or 3.

.gitignore

@@ -1,10 +1,15 @@
 .eunit
+.rebar
 .jiffy.dev
 *.app
 *.beam
+*.d
 *.o
 *.so
+_build
+compile_commands.json
 deps
 erln8.config
 hexer.config
+rebar.lock
 TEST-*.xml

rebar.config

@@ -33,13 +33,8 @@
 ]}.
 
 {eunit_opts, [
-    verbose,
-    {report, {
-        eunit_surefire, [{dir,"."}]
-    }}
-]}.
-
-{plugins, [
-    rebar_gdb_plugin
+    verbose
 ]}.
 
+{pre_hooks, [{"", compile, "./enc compile"}]}.
+{post_hooks, [{"", clean, "./enc clean"}]}.

test/jiffy_01_yajl_tests.erl

@@ -5,6 +5,7 @@
 
 
 -include_lib("eunit/include/eunit.hrl").
+-include("jiffy_util.hrl").
 
 
 yajl_test_() ->
@@ -19,7 +20,7 @@ gen({Name, Json, Erl}) ->
 
 
 read_cases() ->
-    CasesPath = filename:join(["..", "test", "cases", "*.json"]),
+    CasesPath = cases_path("*.json"),
     FileNames = lists:sort(filelib:wildcard(CasesPath)),
     lists:map(fun(F) -> make_pair(F) end, FileNames).
 

test/jiffy_10_short_double_tests.erl

@@ -8,7 +8,8 @@
 -include("jiffy_util.hrl").
 
 
-filename() -> "../test/cases/short-doubles.txt".
+filename() ->
+    cases_path("short-doubles.txt").
 
 
 short_double_test_() ->

test/jiffy_util.hrl

@@ -25,3 +25,16 @@ enc(V) ->
 
 enc(V, Opts) ->
     iolist_to_binary(jiffy:encode(V, Opts)).
+
+
+%% rebar runs eunit with PWD as .eunit/
+%% rebar3 runs eunit with PWD as ./
+%% this adapts to the differences
+cases_path(Suffix) ->
+    {ok, Cwd} = file:get_cwd(),
+    Prefix = case filename:basename(Cwd) of
+        ".eunit" -> "..";
+        _ -> "."
+    end,
+    Path = "test/cases",
+    filename:join([Prefix, Path, Suffix]).