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#!/usr/bin/env escript
%% -*- mode:erlang;tab-width:4;erlang-indent-level:4;indent-tabs-mode:nil -*-
%% ex: ft=erlang ts=4 sw=4 et
main(Args) ->
%% Get a string repr of build time
Built = build_time(),
%% Get a string repr of first matching VCS changeset
VcsInfo = vcs_info([{hg, ".hg", "hg identify -i"},
{git, ".git", "git describe --always"}]),
%% Check for force=1 flag to force a rebuild
case lists:member("force=1", Args) of
true ->
[] = os:cmd("rm -rf ebin/*.beam"),
ok;
false ->
os:cmd("rm -f ebin/rebar_core.beam"),
ok
end,
%% Compile all src/*.erl to ebin
case make:files(filelib:wildcard("src/*.erl"), [{outdir, "ebin"}, {i, "include"},
{d, 'BUILD_TIME', Built},
{d, 'VCS_INFO', VcsInfo}]) of
up_to_date ->
ok;
error ->
io:format("Failed to compile rebar files!\n"),
halt(1)
end,
%% Make sure file:consult can parse the .app file
case file:consult("ebin/rebar.app") of
{ok, _} ->
ok;
{error, Reason} ->
io:format("Invalid syntax in ebin/rebar.app: ~p\n", [Reason]),
halt(1)
end,
%% Add ebin/ to our path
true = code:add_path("ebin"),
%% Run rebar to do proper .app validation and such
rebar:main(["compile"] ++ Args),
%% Read the contents of the files in ebin and templates; note that we place
%% all the beam files at the top level of the code archive so that code loading
%% works properly.
Files = load_files("*", "ebin") ++ load_files("priv/templates/*", "."),
case zip:create("mem", Files, [memory]) of
{ok, {"mem", ZipBin}} ->
%% Archive was successfully created. Prefix that binary with our
%% header and write to "rebar" file
Script = <<"#!/usr/bin/env escript\n", ZipBin/binary>>,
case file:write_file("rebar", Script) of
ok ->
ok;
{error, WriteError} ->
io:format("Failed to write rebar script: ~p\n", [WriteError]),
halt(1)
end;
{error, ZipError} ->
io:format("Failed to construct rebar script archive: ~p\n", [ZipError]),
halt(1)
end,
%% Finally, update executable perms for our script
[] = os:cmd("chmod u+x rebar"),
%% Add a helpful message
io:format("Congratulations! You now have a self-contained script called \"rebar\" in\n"
"your current working directory. Place this script anywhere in your path\n"
"and you can use rebar to build OTP-compliant apps.\n").
build_time() ->
{{Y, M, D}, {H, Min, S}} = calendar:now_to_universal_time(now()),
lists:flatten(io_lib:format("~4..0w~2..0w~2..0w_~2..0w~2..0w~2..0w", [Y, M, D, H, Min, S])).
load_files(Wildcard, Dir) ->
[read_file(Filename, Dir) || Filename <- filelib:wildcard(Wildcard, Dir)].
read_file(Filename, Dir) ->
{ok, Bin} = file:read_file(filename:join(Dir, Filename)),
{Filename, Bin}.
vcs_info([]) ->
"No VCS info available.";
vcs_info([{Id, Dir, Cmd} | Rest]) ->
case filelib:is_dir(Dir) of
true ->
lists:concat([Id, " ", string:strip(os:cmd(Cmd), both, $\n)]);
false ->
vcs_info(Rest)
end.
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