Survive EDoc crashes

Instead of a hard crash, display an error message indicating which app
failed.

We can't report the exact failure; only EDoc does it to stdout itself
and we can't capture it.

Pre/Post hooks are run properly despite the failure, as per escript and
compile providers.

14 files changed, 320 insertions, 10 deletions

diff --git a/src/rebar_prv_edoc.erl b/src/rebar_prv_edoc.erl
index 465fc34..97f70a9 100644
--- a/src/rebar_prv_edoc.erl
+++ b/src/rebar_prv_edoc.erl
@@ -7,6 +7,7 @@
          format_error/1]).
 
 -include("rebar.hrl").
+-include_lib("providers/include/providers.hrl").
 
 -define(PROVIDER, edoc).
 -define(DEPS, [compile]).
@@ -28,7 +29,8 @@ init(State) ->
                                                                {profiles, [docs]}])),
     {ok, State1}.
 
--spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
+-spec do(rebar_state:t()) ->
+    {ok, rebar_state:t()} | {error, string()} | {error, {module(), any()}}.
 do(State) ->
     code:add_pathsa(rebar_state:code_paths(State, all_deps)),
     ProjectApps = rebar_state:project_apps(State),
@@ -37,26 +39,42 @@ do(State) ->
     ShouldAccPaths = not has_configured_paths(EdocOpts),
     Cwd = rebar_state:dir(State),
     rebar_hooks:run_all_hooks(Cwd, pre, ?PROVIDER, Providers, State),
-    lists:foldl(fun(AppInfo, EdocOptsAcc) ->
+    Res = try
+        lists:foldl(fun(AppInfo, EdocOptsAcc) ->
                     rebar_hooks:run_all_hooks(Cwd, pre, ?PROVIDER, Providers, AppInfo, State),
                     AppName = ec_cnv:to_list(rebar_app_info:name(AppInfo)),
                     ?INFO("Running edoc for ~s", [AppName]),
                     AppDir = rebar_app_info:dir(AppInfo),
-                    ok = edoc:application(list_to_atom(AppName), AppDir, EdocOptsAcc),
+                    AppRes = (catch edoc:application(list_to_atom(AppName), AppDir, EdocOptsAcc)),
                     rebar_hooks:run_all_hooks(Cwd, post, ?PROVIDER, Providers, AppInfo, State),
-                    case ShouldAccPaths of
-                        true ->
+                    case {AppRes, ShouldAccPaths} of
+                        {ok, true} ->
                             %% edoc wants / on all OSes
                             add_to_paths(EdocOptsAcc, AppDir++"/doc");
-                        false ->
-                            EdocOptsAcc
+                        {ok, false} ->
+                            EdocOptsAcc;
+                        {{'EXIT', error}, _} ->
+                            %% EDoc is not very descriptive
+                            %% in terms of failures
+                            throw({app_failed, AppName})
                     end
-                end, EdocOpts, ProjectApps),
+                end, EdocOpts, ProjectApps)
+    catch
+        {app_failed, AppName} ->
+            {app_failed, AppName}
+    end,
     rebar_hooks:run_all_hooks(Cwd, post, ?PROVIDER, Providers, State),
     rebar_utils:cleanup_code_path(rebar_state:code_paths(State, default)),
-    {ok, State}.
+    case Res of
+        {app_failed, App} ->
+            ?PRV_ERROR({app_failed, App});
+        _ ->
+            {ok, State}
+    end.
 
 -spec format_error(any()) -> iolist().
+format_error({app_failed, AppName}) ->
+    io_lib:format("Failed to generate documentation for app '~s'", [AppName]);
 format_error(Reason) ->
     io_lib:format("~p", [Reason]).
 
diff --git a/test/rebar_edoc_SUITE.erl b/test/rebar_edoc_SUITE.erl
index fded2b0..2c4aba5 100644
--- a/test/rebar_edoc_SUITE.erl
+++ b/test/rebar_edoc_SUITE.erl
@@ -3,7 +3,7 @@
 -include_lib("eunit/include/eunit.hrl").
 -compile(export_all).
 
-all() -> [multiapp].
+all() -> [multiapp, error_survival].
 
 init_per_testcase(multiapp, Config) ->
     application:load(rebar),
@@ -16,6 +16,18 @@ init_per_testcase(multiapp, Config) ->
     rebar_log:init(command_line, Verbosity),
     State = rebar_state:new([{base_dir, filename:join([AppsDir, "_build"])}
                             ,{root_dir, AppsDir}]),
+    [{apps, AppsDir}, {state, State}, {name, Name} | Config];
+init_per_testcase(error_survival, Config) ->
+    application:load(rebar),
+    DataDir = ?config(data_dir, Config),
+    PrivDir = ?config(priv_dir, Config),
+    Name = rebar_test_utils:create_random_name("error_survival"),
+    AppsDir = filename:join([PrivDir, rebar_test_utils:create_random_name(Name)]),
+    ec_file:copy(filename:join([DataDir, "bad"]), AppsDir, [recursive]),
+    Verbosity = rebar3:log_level(),
+    rebar_log:init(command_line, Verbosity),
+    State = rebar_state:new([{base_dir, filename:join([AppsDir, "_build"])}
+                            ,{root_dir, AppsDir}]),
     [{apps, AppsDir}, {state, State}, {name, Name} | Config].
 
 end_per_testcase(_, Config) ->
@@ -42,6 +54,14 @@ multiapp(Config) ->
               filename:join([AppsDir, "apps", "foo", "doc", "foo.html"]),
               "apps/bar1/doc/bar1.html")).
 
+error_survival(Config) ->
+    RebarConfig = [],
+    rebar_test_utils:run_and_check(
+        Config, RebarConfig, ["edoc"],
+        {error,{rebar_prv_edoc,{app_failed,"bar2"}}}
+    ),
+    ok.
+
 
 file_content_matches(Path, Regex) ->
     case file:read_file(Path) of
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.app.src b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.app.src
new file mode 100644
index 0000000..6e7ec24
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.app.src
@@ -0,0 +1,16 @@
+{application, bar1,
+ [{description, "An OTP application"},
+  {vsn, "0.1.0"},
+  {registered, []},
+  {mod, { bar1_app, []}},
+  {applications,
+   [kernel,
+    stdlib
+   ]},
+  {env,[]},
+  {modules, []},
+
+  {maintainers, []},
+  {licenses, []},
+  {links, []}
+ ]}.
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.erl
new file mode 100644
index 0000000..2700aef
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1.erl
@@ -0,0 +1,9 @@
+-module(bar1).

+-export([bar1/0]).

+-export_type([barer1/0]).

+

+-type barer1() :: string().

+

+% @doc Bar1 bars the bar.

+-spec bar1() -> barer1().

+bar1() -> "Barer1".
\ No newline at end of file
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_app.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_app.erl
new file mode 100644
index 0000000..414ac30
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_app.erl
@@ -0,0 +1,26 @@
+%%%-------------------------------------------------------------------
+%% @doc bar1 public API
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(bar1_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+%%====================================================================
+%% API
+%%====================================================================
+
+start(_StartType, _StartArgs) ->
+    bar1_sup:start_link().
+
+%%--------------------------------------------------------------------
+stop(_State) ->
+    ok.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_sup.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_sup.erl
new file mode 100644
index 0000000..f9d6670
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar1/src/bar1_sup.erl
@@ -0,0 +1,35 @@
+%%%-------------------------------------------------------------------
+%% @doc bar1 top level supervisor.
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(bar1_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+
+%%====================================================================
+%% API functions
+%%====================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?SERVER}, ?MODULE, []).
+
+%%====================================================================
+%% Supervisor callbacks
+%%====================================================================
+
+%% Child :: {Id,StartFunc,Restart,Shutdown,Type,Modules}
+init([]) ->
+    {ok, { {one_for_all, 0, 1}, []} }.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.app.src b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.app.src
new file mode 100644
index 0000000..58de8bc
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.app.src
@@ -0,0 +1,16 @@
+{application, bar2,
+ [{description, "An OTP application"},
+  {vsn, "0.1.0"},
+  {registered, []},
+  {mod, { bar2_app, []}},
+  {applications,
+   [kernel,
+    stdlib
+   ]},
+  {env,[]},
+  {modules, []},
+
+  {maintainers, []},
+  {licenses, []},
+  {links, []}
+ ]}.
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.erl
new file mode 100644
index 0000000..2afb745
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2.erl
@@ -0,0 +1,12 @@
+%% @doc one docline is fine

+%% @doc a second docline causes a failure

+%% @doc if not, then a & causes a bad ref error.

+-module(bar2).

+-export([bar2/0]).

+-export_type([barer2/0]).

+

+-type barer2() :: string().

+

+% @doc Bar2 bars the bar2.

+-spec bar2() -> barer2().

+bar2() -> "Barer2".

diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_app.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_app.erl
new file mode 100644
index 0000000..d0058a0
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_app.erl
@@ -0,0 +1,26 @@
+%%%-------------------------------------------------------------------
+%% @doc bar2 public API
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(bar2_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+%%====================================================================
+%% API
+%%====================================================================
+
+start(_StartType, _StartArgs) ->
+    bar2_sup:start_link().
+
+%%--------------------------------------------------------------------
+stop(_State) ->
+    ok.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_sup.erl b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_sup.erl
new file mode 100644
index 0000000..0bdaf4a
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/bar2/src/bar2_sup.erl
@@ -0,0 +1,35 @@
+%%%-------------------------------------------------------------------
+%% @doc bar2 top level supervisor.
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(bar2_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+
+%%====================================================================
+%% API functions
+%%====================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?SERVER}, ?MODULE, []).
+
+%%====================================================================
+%% Supervisor callbacks
+%%====================================================================
+
+%% Child :: {Id,StartFunc,Restart,Shutdown,Type,Modules}
+init([]) ->
+    {ok, { {one_for_all, 0, 1}, []} }.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.app.src b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.app.src
new file mode 100644
index 0000000..9987fd5
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.app.src
@@ -0,0 +1,17 @@
+{application, foo,
+ [{description, "An OTP application"},
+  {vsn, "0.1.0"},
+  {registered, []},
+  {mod, { foo_app, []}},
+  {applications,
+   [kernel,
+    stdlib,
+    bar1, bar2
+   ]},
+  {env,[]},
+  {modules, []},
+
+  {maintainers, []},
+  {licenses, []},
+  {links, []}
+ ]}.
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.erl b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.erl
new file mode 100644
index 0000000..52e3d0a
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo.erl
@@ -0,0 +1,19 @@
+-module(foo).

+

+-export([foo/0, bar1/0, bar2/0]).

+

+-export_type([fooer/0]).

+

+-type fooer() :: string().

+

+% @doc Foo function returns fooer.

+-spec foo() -> fooer().

+foo() -> "fooer".

+

+% @doc Bar1 function returns barer1.

+-spec bar1() -> bar1:barer1().

+bar1() -> bar1:bar1().

+

+% @doc Bar2 functions returns barer2.

+-spec bar2() -> bar2:barer2().

+bar2() -> bar2:bar2().
\ No newline at end of file
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_app.erl b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_app.erl
new file mode 100644
index 0000000..d0158d7
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_app.erl
@@ -0,0 +1,26 @@
+%%%-------------------------------------------------------------------
+%% @doc foo public API
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(foo_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+%%====================================================================
+%% API
+%%====================================================================
+
+start(_StartType, _StartArgs) ->
+    foo_sup:start_link().
+
+%%--------------------------------------------------------------------
+stop(_State) ->
+    ok.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================
diff --git a/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_sup.erl b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_sup.erl
new file mode 100644
index 0000000..67e88b4
--- /dev/null
+++ b/test/rebar_edoc_SUITE_data/bad/apps/foo/src/foo_sup.erl
@@ -0,0 +1,35 @@
+%%%-------------------------------------------------------------------
+%% @doc foo top level supervisor.
+%% @end
+%%%-------------------------------------------------------------------
+
+-module(foo_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+
+%%====================================================================
+%% API functions
+%%====================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?SERVER}, ?MODULE, []).
+
+%%====================================================================
+%% Supervisor callbacks
+%%====================================================================
+
+%% Child :: {Id,StartFunc,Restart,Shutdown,Type,Modules}
+init([]) ->
+    {ok, { {one_for_all, 0, 1}, []} }.
+
+%%====================================================================
+%% Internal functions
+%%====================================================================