267 lines
9.3 KiB
Erlang
Executable file
267 lines
9.3 KiB
Erlang
Executable file
#!/usr/bin/env escript
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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
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%%! -smp enable
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%%% ---------------------------------------------------------------------------
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%%% @doc
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%%% The purpose of this command is to prepare a rebar3 project so that
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%%% rebar3 understands that the dependencies are all already
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%%% installed. If you want a hygienic build on nix then you must run
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%%% this command before running rebar3. I suggest that you add a
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%%% `Makefile` to your project and have the bootstrap command be a
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%%% dependency of the build commands. See the nix documentation for
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%%% more information.
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%%%
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%%% This command designed to have as few dependencies as possible so
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%%% that it can be a dependency of root level packages like rebar3. To
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%%% that end it does many things in a fairly simplistic way. That is
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%%% by design.
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%%%
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%%% ### Assumptions
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%%%
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%%% This command makes the following assumptions:
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%%%
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%%% * It is run in a nix-shell or nix-build environment
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%%% * that all dependencies have been added to the ERL_LIBS
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%%% Environment Variable
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-record(data, {version
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, debug_info = false
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, compile_ports
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, erl_libs
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, plugins
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, root
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, name}).
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-define(HEX_REGISTRY_PATH, ".cache/rebar3/hex/default/registry").
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main(Args) ->
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{ok, ArgData} = parse_args(Args),
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{ok, RequiredData} = gather_required_data_from_the_environment(ArgData),
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do_the_bootstrap(RequiredData).
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-spec do_the_bootstrap(#data{}) -> ok.
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do_the_bootstrap(RequiredData) ->
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ok = bootstrap_configs(RequiredData),
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ok = bootstrap_plugins(RequiredData),
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ok = bootstrap_libs(RequiredData).
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%% @doc
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%% Argument parsing is super simple only because we want to keep the
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%% dependencies minimal. For now there can be one entry on the
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%% command line: "debug-info"
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-spec parse_args([string()]) -> #data{}.
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parse_args(Args0) ->
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PossibleArgs = sets:from_list(["debug-info"]),
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Args1 = sets:from_list(Args0),
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Result = sets:subtract(Args1, PossibleArgs),
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case sets:to_list(Result) of
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[] ->
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{ok, #data{debug_info = sets:is_element("debug-info", Args1)}};
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UnknownArgs ->
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io:format("Unexpected command line arguments passed in: ~p~n",
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[UnknownArgs]),
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erlang:halt(120)
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end.
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-spec bootstrap_configs(#data{}) -> ok.
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bootstrap_configs(RequiredData)->
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io:format("Boostrapping app and rebar configurations~n"),
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ok = if_single_app_project_update_app_src_version(RequiredData),
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ok = if_compile_ports_add_pc_plugin(RequiredData),
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ok = if_debug_info_add(RequiredData).
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-spec bootstrap_plugins(#data{}) -> ok.
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bootstrap_plugins(#data{plugins = Plugins}) ->
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io:format("Bootstrapping rebar3 plugins~n"),
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Target = "_build/default/plugins/",
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Paths = string:tokens(Plugins, " "),
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CopiableFiles =
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lists:foldl(fun(Path, Acc) ->
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gather_dependency(Path) ++ Acc
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end, [], Paths),
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lists:foreach(fun (Path) ->
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ok = link_app(Path, Target)
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end, CopiableFiles).
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-spec bootstrap_libs(#data{}) -> ok.
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bootstrap_libs(#data{erl_libs = ErlLibs}) ->
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io:format("Bootstrapping dependent libraries~n"),
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Target = "_build/default/lib/",
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Paths = string:tokens(ErlLibs, ":"),
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CopiableFiles =
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lists:foldl(fun(Path, Acc) ->
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gather_directory_contents(Path) ++ Acc
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end, [], Paths),
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lists:foreach(fun (Path) ->
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ok = link_app(Path, Target)
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end, CopiableFiles).
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-spec gather_dependency(string()) -> [{string(), string()}].
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gather_dependency(Path) ->
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FullLibrary = filename:join(Path, "lib/erlang/lib/"),
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case filelib:is_dir(FullLibrary) of
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true ->
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gather_directory_contents(FullLibrary);
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false ->
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[raw_hex(Path)]
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end.
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-spec raw_hex(string()) -> {string(), string()}.
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raw_hex(Path) ->
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[_, Name] = re:split(Path, "-hex-source-"),
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{Path, erlang:binary_to_list(Name)}.
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-spec gather_directory_contents(string()) -> [{string(), string()}].
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gather_directory_contents(Path) ->
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{ok, Names} = file:list_dir(Path),
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lists:map(fun(AppName) ->
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{filename:join(Path, AppName), fixup_app_name(AppName)}
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end, Names).
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%% @doc
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%% Makes a symlink from the directory pointed at by Path to a
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%% directory of the same name in Target. So if we had a Path of
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%% {`foo/bar/baz/bash`, `baz`} and a Target of `faz/foo/foos`, the symlink
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%% would be `faz/foo/foos/baz`.
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-spec link_app({string(), string()}, string()) -> ok.
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link_app({Path, TargetFile}, TargetDir) ->
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Target = filename:join(TargetDir, TargetFile),
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make_symlink(Path, Target).
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-spec make_symlink(string(), string()) -> ok.
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make_symlink(Path, TargetFile) ->
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file:delete(TargetFile),
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ok = filelib:ensure_dir(TargetFile),
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io:format("Making symlink from ~s to ~s~n", [Path, TargetFile]),
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ok = file:make_symlink(Path, TargetFile).
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%% @doc
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%% This takes an app name in the standard OTP <name>-<version> format
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%% and returns just the app name. Why? Because rebar doesn't
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%% respect OTP conventions in some cases.
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-spec fixup_app_name(string()) -> string().
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fixup_app_name(FileName) ->
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case string:tokens(FileName, "-") of
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[Name] -> Name;
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[Name, _Version] -> Name;
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[Name, _Version, _Tag] -> Name
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end.
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-spec gather_required_data_from_the_environment(#data{}) -> {ok, #data{}}.
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gather_required_data_from_the_environment(ArgData) ->
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{ok, ArgData#data{ version = guard_env("version")
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, erl_libs = get_env("ERL_LIBS", [])
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, plugins = get_env("buildPlugins", [])
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, root = code:root_dir()
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, name = guard_env("name")
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, compile_ports = nix2bool(get_env("compilePorts", ""))}}.
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-spec nix2bool(any()) -> boolean().
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nix2bool("1") ->
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true;
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nix2bool("") ->
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false.
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get_env(Name) ->
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os:getenv(Name).
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get_env(Name, Def) ->
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case get_env(Name) of
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false -> Def;
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Val -> Val
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end.
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-spec guard_env(string()) -> string().
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guard_env(Name) ->
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case get_env(Name) of
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false ->
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stderr("Expected Environment variable ~s! Are you sure you are "
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"running in a Nix environment? Either a nix-build, "
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"nix-shell, etc?~n", [Name]),
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erlang:halt(1);
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Variable ->
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Variable
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end.
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%% @doc
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%% If debug info is set we need to add debug info to the list of compile options
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%%
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-spec if_debug_info_add(#data{}) -> ok.
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if_debug_info_add(#data{debug_info = true}) ->
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ConfigTerms = add_debug_info(read_rebar_config()),
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Text = lists:map(fun(Term) -> io_lib:format("~tp.~n", [Term]) end,
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ConfigTerms),
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file:write_file("rebar.config", Text);
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if_debug_info_add(_) ->
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ok.
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-spec add_debug_info([term()]) -> [term()].
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add_debug_info(Config) ->
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ExistingOpts = case lists:keysearch(erl_opts, 1, Config) of
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{value, {erl_opts, ExistingOptsList}} -> ExistingOptsList;
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_ -> []
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end,
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case lists:member(debug_info, ExistingOpts) of
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true ->
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Config;
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false ->
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lists:keystore(erl_opts, 1, Config,
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{erl_opts, [debug_info | ExistingOpts]})
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end.
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%% @doc
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%% If the compile ports flag is set, rewrite the rebar config to
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%% include the 'pc' plugin.
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-spec if_compile_ports_add_pc_plugin(#data{}) -> ok.
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if_compile_ports_add_pc_plugin(#data{compile_ports = true}) ->
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ConfigTerms = add_pc_to_plugins(read_rebar_config()),
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Text = lists:map(fun(Term) -> io_lib:format("~tp.~n", [Term]) end,
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ConfigTerms),
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file:write_file("rebar.config", Text);
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if_compile_ports_add_pc_plugin(_) ->
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ok.
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-spec add_pc_to_plugins([term()]) -> [term()].
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add_pc_to_plugins(Config) ->
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PluginList = case lists:keysearch(plugins, 1, Config) of
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{value, {plugins, ExistingPluginList}} -> ExistingPluginList;
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_ -> []
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end,
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lists:keystore(plugins, 1, Config, {plugins, [pc | PluginList]}).
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-spec read_rebar_config() -> [term()].
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read_rebar_config() ->
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case file:consult("rebar.config") of
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{ok, Terms} ->
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Terms;
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_ ->
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stderr("Unable to read rebar config!", []),
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erlang:halt(1)
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end.
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-spec if_single_app_project_update_app_src_version(#data{}) -> ok.
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if_single_app_project_update_app_src_version(#data{name = Name,
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version = Version}) ->
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SrcFile = filename:join("src",
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lists:concat([Name, ".app.src"])),
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case filelib:is_file(SrcFile) of
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true ->
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update_app_src_with_version(SrcFile, Version);
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false ->
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ok
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end.
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-spec update_app_src_with_version(string(), string()) -> ok.
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update_app_src_with_version(SrcFile, Version) ->
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{ok, [{application, Name, Details}]} = file:consult(SrcFile),
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NewDetails = lists:keyreplace(vsn, 1, Details, {vsn, Version}),
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ok = file:write_file(SrcFile, io_lib:fwrite("~p.\n", [{application, Name, NewDetails}])).
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%% @doc
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%% Write the result of the format string out to stderr.
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-spec stderr(string(), [term()]) -> ok.
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stderr(FormatStr, Args) ->
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io:put_chars(standard_error, io_lib:format(FormatStr, Args)).
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