Fix dupes in deps provider, support atom pkgs

Whenever files were being locked *and* provided in rebar.config
duplicates could be printed. This is taken care of.

Also whenever atom packages were being used, they would cause the merge
step to fail. The new format does proper name-based deduplication of
resources, giving priority to locks to work.

ModificatioN/needs-update support is still in.

This may also act as a fix for #341, if automation isn't required too
much.

src/rebar_prv_deps.erl

@@ -13,14 +13,18 @@
 
 -spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
 init(State) ->
-    State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
-                                                               {module, ?MODULE},
-                                                               {bare, true},
-                                                               {deps, ?DEPS},
-                                                               {example, "rebar3 deps"},
-                                                               {short_desc, "List dependencies"},
-                                                               {desc, info("List dependencies")},
-                                                               {opts, []}])),
+    State1 = rebar_state:add_provider(
+            State,
+            providers:create([
+                    {name, ?PROVIDER},
+                    {module, ?MODULE},
+                    {bare, true},
+                    {deps, ?DEPS},
+                    {example, "rebar3 deps"},
+                    {short_desc, "List dependencies"},
+                    {desc, "List dependencies. Those not matching lock files "
+                           "are followed by an asterisk (*)."},
+                    {opts, []}])),
     {ok, State1}.
 
 -spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
@@ -44,21 +48,49 @@ display(State, Profile, Deps) ->
     display_deps(State, Deps),
     ?CONSOLE("", []).
 
-merge(Deps, Deps) ->
-    Deps;
 merge(Deps, SourceDeps) ->
+    merge1(dedup([normalize(Dep) || Dep <- Deps]),
+           [normalize(Dep) || Dep <- SourceDeps]).
+
+normalize(Name) when is_binary(Name) ->
+    Name;
+normalize(Name) when is_atom(Name) ->
+    ec_cnv:to_binary(Name);
+normalize(Dep) when is_tuple(Dep) ->
+    Name = element(1, Dep),
+    setelement(1, Dep, normalize(Name)).
+
+merge1(Deps, SourceDeps) ->
+    Names = [name(Dep) || Dep <- Deps],
     ToAdd = [Dep || Dep <- SourceDeps,
-                    not lists:keymember(ec_cnv:to_binary(element(1,Dep)), 1, Deps)],
+                    not lists:member(name(Dep), Names)],
     Deps ++ ToAdd.
 
+%% Keep the latter one as locks come after regular deps in the list.
+%% This is totally not safe as an assumption, but it's what we got.
+%% We do this by comparing the current element and looking if a
+%% similar named one happens later. If so, drop the current one.
+dedup(Deps) -> dedup(Deps, [name(Dep) || Dep <- Deps]).
+
+dedup([], []) -> [];
+dedup([Dep|Deps], [Name|DepNames]) ->
+    case lists:member(Name, DepNames) of
+        true -> dedup(Deps, DepNames);
+        false -> [Dep | dedup(Deps, DepNames)]
+    end.
+
+name(T) when is_tuple(T) -> element(1, T);
+name(B) when is_binary(B) -> B.
+
+
 display_deps(State, Deps) ->
     lists:foreach(fun(Dep) -> display_dep(State, Dep) end, Deps).
 
 %% packages
 display_dep(_State, {Name, Vsn}) when is_list(Vsn) ->
     ?CONSOLE("~s* (package ~s)", [ec_cnv:to_binary(Name), ec_cnv:to_binary(Vsn)]);
-display_dep(_State, Name) when is_atom(Name) ->
-    ?CONSOLE("~s* (package)", [ec_cnv:to_binary(Name)]);
+display_dep(_State, Name) when is_binary(Name) ->
+    ?CONSOLE("~s* (package)", [Name]);
 %% git source
 display_dep(_State, {Name, Source}) when is_tuple(Source), element(1, Source) =:= git ->
     ?CONSOLE("~s* (git source)", [ec_cnv:to_binary(Name)]);
@@ -98,38 +130,3 @@ display_dep(State, {Name, Source, Level}) when is_tuple(Source), is_integer(Leve
         false -> ""
     end,
     ?CONSOLE("~s~s (locked ~p)", [Name, NeedsUpdate, Source]).
-
-info(Description) ->
-    io_lib:format("~s.~n"
-                 "~n"
-                 "Valid rebar.config options:~n"
-                 "  ~p~n"
-                 "  ~p~n"
-                 "Valid command line options:~n"
-                 "  deps_dir=\"deps\" (override default or rebar.config deps_dir)~n",
-                 [
-                 Description,
-                 {deps_dir, "deps"},
-                 {deps,
-                  [app_name,
-                   {rebar, "1.0.*"},
-                   {rebar, ".*",
-                    {git, "git://github.com/rebar/rebar.git"}},
-                   {rebar, ".*",
-                    {git, "git://github.com/rebar/rebar.git", "Rev"}},
-                   {rebar, "1.0.*",
-                    {git, "git://github.com/rebar/rebar.git", {branch, "master"}}},
-                   {rebar, "1.0.0",
-                    {git, "git://github.com/rebar/rebar.git", {tag, "1.0.0"}}},
-                   {rebar, "",
-                    {git, "git://github.com/rebar/rebar.git", {branch, "master"}},
-                    [raw]},
-                   {app_name, ".*", {hg, "https://www.example.org/url"}},
-                   {app_name, ".*", {rsync, "Url"}},
-                   {app_name, ".*", {svn, "https://www.example.org/url"}},
-                   {app_name, ".*", {svn, "svn://svn.example.org/url"}},
-                   {app_name, ".*", {bzr, "https://www.example.org/url", "Rev"}},
-                   {app_name, ".*", {fossil, "https://www.example.org/url"}},
-                   {app_name, ".*", {fossil, "https://www.example.org/url", "Vsn"}},
-                   {app_name, ".*", {p4, "//depot/subdir/app_dir"}}]}
-                 ]).