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#!/usr/bin/env escript
%% -*- erlang -*-
-mode(compile).
%% We expect the list of Erlang source and header files to arrive on stdin
main([TargetFile, EbinDir]) ->
ErlsAndHrls = string:tokens(io:get_line(""), ":\n"),
ErlFiles = [F || F <- ErlsAndHrls, lists:suffix(".erl", F)],
Modules = sets:from_list(
[list_to_atom(filename:basename(FileName, ".erl")) ||
FileName <- ErlFiles]),
HrlFiles = [F || F <- ErlsAndHrls, lists:suffix(".hrl", F)],
IncludeDirs = lists:usort([filename:dirname(Path) || Path <- HrlFiles]),
Headers = sets:from_list(HrlFiles),
Deps = lists:foldl(
fun (Path, Deps1) ->
dict:store(Path, detect_deps(IncludeDirs, 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(IncludeDirs, EbinDir, Modules, Headers, Path) ->
{ok, Forms} = epp:parse_file(Path, IncludeDirs, [{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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