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Avoid extra list traversal when checking for modified source files

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This commit is contained in:
David Kubecka 2015-03-23 04:40:52 +01:00
parent 22acf8db67
commit 13fe77d3f5
1 changed files with 18 additions and 14 deletions
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32
src/rebar_erlc_compiler.erl
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@ -406,16 +406,23 @@ init_erlcinfo(InclDirs, Erls) ->
ok = file:delete(erlcinfo_file())
end,
Dirs = source_and_include_dirs(InclDirs, Erls),
Updates = [update_erlcinfo(G, Erl, Dirs) || Erl <- Erls],
Modified = lists:member(modified, Updates),
ok = store_erlcinfo(G, Modified, InclDirs),
Modified = lists:foldl(update_erlcinfo_fun(G, Dirs), false, Erls),
if Modified -> store_erlcinfo(G, InclDirs); not Modified -> ok end,
G.
source_and_include_dirs(InclDirs, Erls) ->
SourceDirs = lists:map(fun filename:dirname/1, Erls),
lists:usort(["include" | InclDirs ++ SourceDirs]).
update_erlcinfo(G, Source, Dirs) ->
update_erlcinfo_fun(G, Dirs) ->
fun(Erl, Modified) ->
case update_erlcinfo(G, Dirs, Erl) of
modified -> true;
unmodified -> Modified
end
end.
update_erlcinfo(G, Dirs, Source) ->
case digraph:vertex(G, Source) of
{_, LastUpdated} ->
case filelib:last_modified(Source) of
@ -426,14 +433,12 @@ update_erlcinfo(G, Source, Dirs) ->
digraph:del_vertex(G, Source),
modified;
LastModified when LastUpdated < LastModified ->
modify_erlcinfo(G, Source, Dirs),
modified;
modify_erlcinfo(G, Source, Dirs);
_ ->
unmodified
end;
false ->
modify_erlcinfo(G, Source, Dirs),
modified
modify_erlcinfo(G, Source, Dirs)
end.
modify_erlcinfo(G, Source, Dirs) ->
@ -445,9 +450,10 @@ modify_erlcinfo(G, Source, Dirs) ->
digraph:add_vertex(G, Source, LastUpdated),
lists:foreach(
fun(Incl) ->
update_erlcinfo(G, Incl, Dirs),
update_erlcinfo(G, Dirs, Incl),
digraph:add_edge(G, Source, Incl)
end, AbsIncls).
end, AbsIncls),
modified.
restore_erlcinfo(G, InclDirs) ->
case file:read_file(erlcinfo_file()) of
@ -468,9 +474,7 @@ restore_erlcinfo(G, InclDirs) ->
ok
end.
store_erlcinfo(_G, _Modified = false, _InclDirs) ->
ok;
store_erlcinfo(G, _Modified, InclDirs) ->
store_erlcinfo(G, InclDirs) ->
Vs = lists:map(
fun(V) ->
digraph:vertex(G, V)
@ -486,7 +490,7 @@ store_erlcinfo(G, _Modified, InclDirs) ->
File = erlcinfo_file(),
ok = filelib:ensure_dir(File),
Data = term_to_binary(#erlcinfo{info={Vs, Es, InclDirs}}, [{compressed, 9}]),
file:write_file(File, Data).
ok = file:write_file(File, Data).
%% NOTE: If, for example, one of the entries in Files refers to
%% gen_server.erl, that entry will be dropped. It is dropped because