Alias plugin promoted to built-in command

- Uses the code at https://github.com/tsloughter/rebar_alias and brings
  it within rebar3
- adds safety checks to prevent redefining built-in commands or obvious
  circular dependencies between commands (indirect circular deps are
  still possible)
- adds tests
- adds a systest to ensure no clash with the existing plugin

2 files changed, 28 insertions, 0 deletions

diff --git a/systest/all_SUITE_data/alias_clash/src/alias_clash.app.src b/systest/all_SUITE_data/alias_clash/src/alias_clash.app.src
new file mode 100644
index 0000000..b4cdda2
--- /dev/null
+++ b/systest/all_SUITE_data/alias_clash/src/alias_clash.app.src
@@ -0,0 +1,15 @@
+{application, alias_clash,
+ [{description, "An OTP library"},
+  {vsn, "0.1.0"},
+  {registered, []},
+  {applications,
+   [kernel,
+    stdlib
+   ]},
+  {env,[]},
+  {modules, []},
+
+  {maintainers, []},
+  {licenses, ["Apache 2.0"]},
+  {links, []}
+ ]}.
diff --git a/systest/all_SUITE_data/alias_clash/src/alias_clash.erl b/systest/all_SUITE_data/alias_clash/src/alias_clash.erl
new file mode 100644
index 0000000..9249cdb
--- /dev/null
+++ b/systest/all_SUITE_data/alias_clash/src/alias_clash.erl
@@ -0,0 +1,13 @@
+-module(alias_clash).
+
+%% API exports
+-export([]).
+
+%%====================================================================
+%% API functions
+%%====================================================================
+
+
+%%====================================================================
+%% Internal functions
+%%====================================================================