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#!/usr/bin/env escript
%% -*- mode: erlang;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", "hg status"},
{git, ".git", "git describe --always --tags",
"git status -s"}]),
%% Check for force=1 flag to force a rebuild
case lists:member("force=1", Args) of
true ->
rm("ebin/*.beam");
false ->
rm("ebin/rebar.beam")
end,
%% Add check for debug flag
DebugFlag = case lists:member("debug", Args) of
true -> debug_info;
false -> undefined
end,
%% Extract the system info of the version of OTP we use to compile rebar
OtpInfo = string:strip(erlang:system_info(otp_release), both, $\n),
%% Types dict:dict() and digraph:digraph() have been introduced in
%% Erlang 17.
%% At the same time, their counterparts dict() and digraph() are to be
%% deprecated in Erlang 18. namespaced_types option is used to select
%% proper type name depending on the OTP version used.
NamespacedTypes = case is_otp(OtpInfo, "^[0-9]+") of
true -> {d, namespaced_types};
false -> undefined
end,
%% Compile all src/*.erl to ebin
case make:files(filelib:wildcard("src/*.erl"),
[{outdir, "ebin"}, {i, "include"},
DebugFlag,
NamespacedTypes,
{d, 'BUILD_TIME', Built},
{d, 'VCS_INFO', VcsInfo},
{d, 'OTP_INFO', OtpInfo}]) 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 compile to do proper .app validation etc.
%% and rebar escriptize to create the rebar script
RebarArgs = Args -- ["debug"], %% Avoid trying to run 'debug' command
rebar:main(["compile", "escriptize"] ++ RebarArgs),
%% Finally, update executable perms for our script on *nix,
%% or write out script files on win32.
case os:type() of
{unix,_} ->
[] = os:cmd("chmod u+x rebar"),
ok;
{win32,_} ->
write_windows_scripts(),
ok;
_ ->
ok
end,
%% 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").
is_otp(OtpInfo, Regex) ->
case re:run(OtpInfo, Regex, [{capture, none}]) of
match -> true;
nomatch -> false
end.
rm(Path) ->
NativePath = filename:nativename(Path),
Cmd = case os:type() of
{unix,_} -> "rm -f ";
{win32,_} -> "del /q "
end,
[] = os:cmd(Cmd ++ NativePath),
ok.
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])).
vcs_info([]) ->
"No VCS info available.";
vcs_info([{Id, Dir, VsnCmd, StatusCmd} | Rest]) ->
case filelib:is_dir(Dir) of
true ->
Vsn = string:strip(os:cmd(VsnCmd), both, $\n),
Status = case string:strip(os:cmd(StatusCmd), both, $\n) of
[] ->
"";
_ ->
"-dirty"
end,
lists:concat([Id, " ", Vsn, Status]);
false ->
vcs_info(Rest)
end.
write_windows_scripts() ->
CmdScript=
"@echo off\r\n"
"setlocal\r\n"
"set rebarscript=%~f0\r\n"
"escript.exe \"%rebarscript:.cmd=%\" %*\r\n",
ok = file:write_file("rebar.cmd", CmdScript).
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