1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
-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) ->
cull_deps(Graph,
Vertices,
1,
lists:foldl(fun({Key, _}, Levels) ->
dict:store(Key, 0, Levels)
end, dict:new(), Vertices),
lists:foldl(fun({Key, _}=N, Solution) ->
dict:store(Key, N, Solution)
end, dict:new(), Vertices),
[]).
cull_deps(_Graph, [], _Level, Levels, Solution, Discarded) ->
{_, Vertices} = lists:unzip(dict:to_list(Solution)),
LvlVertices = [{App,Vsn,dict:fetch(App,Levels)} || {App,Vsn} <- Vertices],
{ok, LvlVertices, Discarded};
cull_deps(Graph, Vertices, Level, Levels, Solution, Discarded) ->
{NV, NS, LS, DS} =
lists:foldl(fun(V, {NewVertices, SolutionAcc, LevelsAcc, DiscardedAcc}) ->
OutNeighbors = lists:keysort(1, digraph:out_neighbours(Graph, V)),
lists:foldl(fun({Key, _}=N, {NewVertices1, SolutionAcc1, LevelsAcc1, DiscardedAcc1}) ->
case dict:find(Key, SolutionAcc1) of
{ok, N} -> % already seen
{NewVertices1, SolutionAcc1, LevelsAcc, DiscardedAcc1};
{ok, _} -> % conflict resolution!
{NewVertices1, SolutionAcc1, LevelsAcc, [N|DiscardedAcc1]};
error ->
{[N | NewVertices1],
dict:store(Key, N, SolutionAcc1),
dict:store(Key, Level, LevelsAcc1),
DiscardedAcc1}
end
end, {NewVertices, SolutionAcc, LevelsAcc, DiscardedAcc}, OutNeighbors)
end, {[], Solution, Levels, Discarded}, lists:keysort(1, Vertices)),
cull_deps(Graph, NV, Level+1, LS, NS, DS).
subgraph(Graph, Vertices) ->
digraph_utils:subgraph(Graph, Vertices).
format_error(no_solution) ->
io_lib:format("No solution for packages found.", []).
%%====================================================================
%% Internal Functions
%%====================================================================
-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).
|
