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#!/usr/bin/env escript
%% -*- erlang -*-
-mode(compile).
main([IncludeDir, ErlDir, EbinDir, TargetFile]) ->
ErlDirContents = filelib:wildcard("*.erl", ErlDir),
ErlFiles = [filename:join(ErlDir, FileName) || FileName <- ErlDirContents],
Modules = sets:from_list(
[list_to_atom(filename:basename(FileName, ".erl")) ||
FileName <- ErlDirContents]),
Headers = sets:from_list(
[filename:join(IncludeDir, FileName) ||
FileName <- filelib:wildcard("*.hrl", IncludeDir)]),
Deps = lists:foldl(
fun (Path, Deps1) ->
dict:store(Path, detect_deps(IncludeDir, EbinDir,
Modules, Headers, Path),
Deps1)
end, dict:new(), ErlFiles),
{ok, Hdl} = file:open(TargetFile, [write, delayed_write]),
dict:fold(
fun (_Path, [], ok) ->
ok;
(Path, Dep, ok) ->
Module = filename:basename(Path, ".erl"),
ok = file:write(Hdl, [EbinDir, "/", Module, ".beam: ",
Path]),
ok = sets:fold(fun (E, ok) -> file:write(Hdl, [" ", E]) end,
ok, Dep),
file:write(Hdl, ["\n"])
end, ok, Deps),
ok = file:write(Hdl, [TargetFile, ": ", escript:script_name(), "\n"]),
ok = file:sync(Hdl),
ok = file:close(Hdl).
detect_deps(IncludeDir, EbinDir, Modules, Headers, Path) ->
{ok, Forms} = epp:parse_file(Path, [IncludeDir], [{use_specs, true}]),
lists:foldl(
fun ({attribute, _LineNumber, Attribute, Behaviour}, Deps)
when Attribute =:= behaviour orelse Attribute =:= behavior ->
case sets:is_element(Behaviour, Modules) of
true -> sets:add_element(
[EbinDir, "/", atom_to_list(Behaviour), ".beam"],
Deps);
false -> Deps
end;
({attribute, _LineNumber, file, {FileName, _LineNumber1}}, Deps) ->
case sets:is_element(FileName, Headers) of
true -> sets:add_element(FileName, Deps);
false -> Deps
end;
(_Form, Deps) ->
Deps
end, sets:new(), Forms).
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