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-module(rebar_digraph).
-export([compile_order/1
,restore_graph/1
,cull_deps/2
,subgraph/2
,format_error/1]).
-include("rebar.hrl").
%% Sort apps with topological sort to get proper build order
compile_order(Apps) ->
Graph = digraph:new(),
lists:foreach(fun(App) ->
Name = rebar_app_info:name(App),
Deps = all_apps_deps(App),
add(Graph, {Name, Deps})
end, Apps),
case digraph_utils:topsort(Graph) of
false ->
case digraph_utils:is_acyclic(Graph) of
true ->
{error, no_sort};
false ->
Cycles = lists:sort(
[lists:sort(Comp) || Comp <- digraph_utils:strong_components(Graph),
length(Comp)>1]),
{error, {cycles, Cycles}}
end;
V ->
{ok, names_to_apps(lists:reverse(V), Apps)}
end.
add(Graph, {PkgName, Deps}) ->
case digraph:vertex(Graph, PkgName) of
false ->
V = digraph:add_vertex(Graph, PkgName);
{V, []} ->
V
end,
lists:foreach(fun(DepName) ->
Name1 = case DepName of
{Name, _Vsn} ->
ec_cnv:to_binary(Name);
Name ->
ec_cnv:to_binary(Name)
end,
V3 = case digraph:vertex(Graph, Name1) of
false ->
digraph:add_vertex(Graph, Name1);
{V2, []} ->
V2
end,
digraph:add_edge(Graph, V, V3)
end, Deps).
restore_graph({Vs, Es}) ->
Graph = digraph:new(),
lists:foreach(fun({V, LastUpdated}) ->
digraph:add_vertex(Graph, V, LastUpdated)
end, Vs),
lists:foreach(fun({V1, V2}) ->
digraph:add_edge(Graph, V1, V2)
end, Es),
Graph.
%% Pick packages to fullfill dependencies
%% The first dep while traversing the graph is chosen and any conflicting
%% dep encountered later on is ignored.
cull_deps(Graph, Vertices) ->
{Solution, Levels} = build_initial_dicts(Vertices),
cull_deps(Graph, Vertices, Levels, Solution, []).
format_error(no_solution) ->
io_lib:format("No solution for packages found.", []).
%%====================================================================
%% Internal Functions
%%====================================================================
cull_deps(_Graph, [], Levels, Solution, Discarded) ->
{_, Vertices} = lists:unzip(dict:to_list(Solution)),
LvlVertices = [{Profile, {Parent,App,Vsn,dict:fetch(App,Levels)}} || {Profile, {Parent,App,Vsn}} <- Vertices],
{ok, LvlVertices, Discarded};
cull_deps(Graph, [{Profile, Level, Vs} | Vertices], Levels, Solution, Discarded) ->
{NV, NS, LS, DS} =
lists:foldl(fun({_, Name, Vsn}, {Acc, SolutionAcc, LevelsAcc, DiscardedAcc}) ->
OutNeighbors = lists:keysort(1, digraph:out_neighbours(Graph, {Name,Vsn})),
handle_neighbors(Profile, Level, Name
,OutNeighbors, Acc, SolutionAcc
,LevelsAcc, DiscardedAcc)
end, {[], Solution, Levels, Discarded}, lists:keysort(2, Vs)),
cull_deps(Graph, Vertices++NV, LS, NS, DS).
%% For each outgoing edge of a dep check if it should be added to the solution
%% and add it to the list of vertices to do the same for
handle_neighbors(Profile, Level, Parent, OutNeighbors, Vertices
,Solution, Levels, Discarded) ->
case lists:foldl(fun({Name, _}=N, {NewVertices, Solution1, Levels1, Discarded1}) ->
maybe_add_to_solution(Profile, Level, Name, N, Parent
,NewVertices, Solution1
,Levels1, Discarded1)
end, {[], Solution, Levels, Discarded}, OutNeighbors) of
{[], SolutionAcc2, LevelsAcc2, DiscardedAcc2} ->
{Vertices, SolutionAcc2, LevelsAcc2, DiscardedAcc2};
{NewVertices1, SolutionAcc2, LevelsAcc2, DiscardedAcc2} ->
{Vertices++[{Profile, Level+1, NewVertices1}]
,SolutionAcc2, LevelsAcc2, DiscardedAcc2}
end.
maybe_add_to_solution(Profile, Level, Key, {Name, Vsn}=Value, Parent
,Vertices ,Solution, Levels, Discarded) ->
case dict:find(Key, Solution) of
{ok, {Profile, {Parent, Name, Vsn}}} -> % already seen
{Vertices,
Solution,
Levels,
Discarded};
{ok, _} -> % conflict resolution!
{Vertices,
Solution,
Levels,
[Value|Discarded]};
error ->
{[{Parent, Name, Vsn} | Vertices],
dict:store(Key, {Profile, {Parent, Name, Vsn}}, Solution),
dict:store(Key, Level+1, Levels),
Discarded}
end.
subgraph(Graph, Vertices) ->
digraph_utils:subgraph(Graph, Vertices).
maybe_add_to_dict(Key, Value, Dict) ->
case dict:is_key(Key, Dict) of
true ->
Dict;
false ->
dict:store(Key, Value, Dict)
end.
%% Track the profile (so we know where to install it), name/vsn of each dep
%% and the level it is from (for the lock file)
build_initial_dicts(Vertices) ->
lists:foldl(fun({Profile, Level, Vs}, {Solution, Levels}) ->
lists:foldl(fun({Parent, Key, Vsn}, {SAcc, LAcc}) ->
{maybe_add_to_dict(Key, {Profile, {Parent,Key,Vsn}}, SAcc),
maybe_add_to_dict(Key, Level, LAcc)}
end, {Solution, Levels}, Vs)
end, {dict:new(), dict:new()}, Vertices).
-spec names_to_apps([atom()], [rebar_app_info:t()]) -> [rebar_app_info:t()].
names_to_apps(Names, Apps) ->
[element(2, App) || App <- [find_app_by_name(Name, Apps) || Name <- Names], App =/= error].
-spec find_app_by_name(atom(), [rebar_app_info:t()]) -> {ok, rebar_app_info:t()} | error.
find_app_by_name(Name, Apps) ->
ec_lists:find(fun(App) ->
rebar_app_info:name(App) =:= Name
end, Apps).
%% The union of all entries in the applications list for an app and
%% the deps listed in its rebar.config is all deps that may be needed
%% for building the app.
all_apps_deps(App) ->
Applications = lists:usort([atom_to_binary(X, utf8) || X <- rebar_app_info:applications(App)]),
Deps = lists:usort(lists:map(fun({Name, _}) -> Name; (Name) -> Name end, rebar_app_info:deps(App))),
lists:umerge(Deps, Applications).
|
