Add pre and post script support for all commands

This change makes it possible to assign pre/post scripts to all
rebar commands. This allows users fine grained control over
when scripts and/or shell commands should be executed, where such
extensions are absolutely needed.

Several examples have been added to the rebar.config.sample file.

3 files changed, 52 insertions, 0 deletions

diff --git a/inttest/thooks/fish.erl b/inttest/thooks/fish.erl
new file mode 100644
index 0000000..739cb94
--- /dev/null
+++ b/inttest/thooks/fish.erl
@@ -0,0 +1,5 @@
+-module(fish).
+
+-compile(export_all).
+
+fish() -> fish.
diff --git a/inttest/thooks/rebar.config b/inttest/thooks/rebar.config
new file mode 100644
index 0000000..6514818
--- /dev/null
+++ b/inttest/thooks/rebar.config
@@ -0,0 +1,7 @@
+%% pre-scripts
+{pre_hooks, [{clean, "echo preclean >> preclean.out"},
+             {compile, "echo precompile >> precompile.out"}]}.
+
+%% post-scripts
+{post_hooks, [{clean, "echo postclean >> postclean.out"},
+              {compile, "echo postcompile >> postcompile.out"}]}.
diff --git a/inttest/thooks/thooks_rt.erl b/inttest/thooks/thooks_rt.erl
new file mode 100644
index 0000000..52af9f5
--- /dev/null
+++ b/inttest/thooks/thooks_rt.erl
@@ -0,0 +1,40 @@
+-module(thooks_rt).
+
+-include_lib("eunit/include/eunit.hrl").
+-compile(export_all).
+
+files() ->
+    [
+     %% dummy lfe files
+     {copy, "../../rebar", "rebar"},
+     {copy, "rebar.config", "rebar.config"},
+     {copy, "fish.erl", "src/fish.erl"},
+     {create, "ebin/fish.app", app(fish, [fish])}
+    ].
+
+run(_Dir) ->
+    ?assertMatch({ok, _}, retest_sh:run("./rebar -v clean compile", [])),
+    ensure_command_ran_only_once("preclean"),
+    ensure_command_ran_only_once("precompile"),
+    ensure_command_ran_only_once("postclean"),
+    ensure_command_ran_only_once("postcompile"),
+    ok.
+
+ensure_command_ran_only_once(Command) ->
+    File = Command ++ ".out",
+    ?assert(filelib:is_regular(File)),
+    %% ensure that this command only ran once (not for each module)
+    {ok, Content} = file:read_file(File),
+    ?assertEqual(Command ++ "\n", binary_to_list(Content)).
+
+%%
+%% Generate the contents of a simple .app file
+%%
+app(Name, Modules) ->
+    App = {application, Name,
+           [{description, atom_to_list(Name)},
+            {vsn, "1"},
+            {modules, Modules},
+            {registered, []},
+            {applications, [kernel, stdlib]}]},
+    io_lib:format("~p.\n", [App]).