%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*- %% ex: ts=4 sw=4 et %% ------------------------------------------------------------------- %% %% rebar: Erlang Build Tools %% %% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com) %% %% Permission is hereby granted, free of charge, to any person obtaining a copy %% of this software and associated documentation files (the "Software"), to deal %% in the Software without restriction, including without limitation the rights %% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell %% copies of the Software, and to permit persons to whom the Software is %% furnished to do so, subject to the following conditions: %% %% The above copyright notice and this permission notice shall be included in %% all copies or substantial portions of the Software. %% %% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR %% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, %% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE %% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER %% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, %% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN %% THE SOFTWARE. %% ------------------------------------------------------------------- -module(rebar_core). -export([process_commands/2, skip_dir/1, is_skip_dir/1, skip_dirs/0]). -include("rebar.hrl"). %% =================================================================== %% Public API %% =================================================================== skip_dir(Dir) -> SkipDir = {skip_dir, Dir}, case erlang:get(SkipDir) of undefined -> ?DEBUG("Adding skip dir: ~s\n", [Dir]), erlang:put(SkipDir, true); true -> ok end. is_skip_dir(Dir) -> case erlang:get({skip_dir, Dir}) of undefined -> false; true -> true end. skip_dirs() -> [Dir || {{skip_dir, Dir}, true} <- erlang:get()]. %% =================================================================== %% Internal functions %% =================================================================== process_commands([], _ParentConfig) -> case erlang:get(operations) of 0 -> %% none of the commands had an effect ?FAIL; _ -> ok end; process_commands([Command | Rest], ParentConfig) -> %% Reset skip dirs lists:foreach(fun (D) -> erlang:erase({skip_dir, D}) end, skip_dirs()), Operations = erlang:get(operations), %% Convert the code path so that all the entries are absolute paths. %% If not, code:set_path() may choke on invalid relative paths when trying %% to restore the code path from inside a subdirectory. true = rebar_utils:expand_code_path(), _ = process_dir(rebar_utils:get_cwd(), ParentConfig, Command, sets:new()), case erlang:get(operations) of Operations -> %% This command didn't do anything ?CONSOLE("Command '~p' not understood\n", [Command]); _ -> ok end, process_commands(Rest, ParentConfig). process_dir(Dir, ParentConfig, Command, DirSet) -> case filelib:is_dir(Dir) of false -> ?WARN("Skipping non-existent sub-dir: ~p\n", [Dir]), DirSet; true -> ?DEBUG("Entering ~s\n", [Dir]), ok = file:set_cwd(Dir), Config = rebar_config:new(ParentConfig), %% Save the current code path and then update it with %% lib_dirs. Children inherit parents code path, but we %% also want to ensure that we restore everything to pristine %% condition after processing this child CurrentCodePath = update_code_path(Config), %% Get the list of processing modules and check each one against %% CWD to see if it's a fit -- if it is, use that set of modules %% to process this dir. {ok, AvailModuleSets} = application:get_env(rebar, modules), {DirModules, ModuleSetFile} = choose_module_set(AvailModuleSets, Dir), %% Get the list of modules for "any dir". This is a catch-all list %% of modules that are processed in addition to modules associated %% with this directory type. These any_dir modules are processed %% FIRST. {ok, AnyDirModules} = application:get_env(rebar, any_dir_modules), Modules = AnyDirModules ++ DirModules, %% Invoke 'preprocess' on the modules -- this yields a list of other %% directories that should be processed _before_ the current one. Predirs = acc_modules(Modules, preprocess, Config, ModuleSetFile), ?DEBUG("Predirs: ~p\n", [Predirs]), DirSet2 = process_each(Predirs, Command, Config, ModuleSetFile, DirSet), %% Make sure the CWD is reset properly; processing the dirs may have %% caused it to change ok = file:set_cwd(Dir), %% Check that this directory is not on the skip list case is_skip_dir(Dir) of true -> %% Do not execute the command on the directory, as some %% module as requested a skip on it. ?INFO("Skipping ~s in ~s\n", [Command, Dir]); false -> %% Get the list of plug-in modules from rebar.config. These %% modules are processed LAST and do not participate %% in preprocess. {ok, PluginModules} = plugin_modules(Config), %% Execute any before_command plugins on this directory execute_pre(Command, PluginModules, Config, ModuleSetFile), %% Execute the current command on this directory execute(Command, Modules ++ PluginModules, Config, ModuleSetFile), %% Execute any after_command plugins on this directory execute_post(Command, PluginModules, Config, ModuleSetFile) end, %% Mark the current directory as processed DirSet3 = sets:add_element(Dir, DirSet2), %% Invoke 'postprocess' on the modules. This yields a list of other %% directories that should be processed _after_ the current one. Postdirs = acc_modules(Modules, postprocess, Config, ModuleSetFile), ?DEBUG("Postdirs: ~p\n", [Postdirs]), DirSet4 = process_each(Postdirs, Command, Config, ModuleSetFile, DirSet3), %% Make sure the CWD is reset properly; processing the dirs may have %% caused it to change ok = file:set_cwd(Dir), %% Once we're all done processing, reset the code path to whatever %% the parent initialized it to restore_code_path(CurrentCodePath), %% Return the updated dirset as our result DirSet4 end. %% %% Given a list of directories and a set of previously processed directories, %% process each one we haven't seen yet %% process_each([], _Command, _Config, _ModuleSetFile, DirSet) -> DirSet; process_each([Dir | Rest], Command, Config, ModuleSetFile, DirSet) -> case sets:is_element(Dir, DirSet) of true -> ?DEBUG("Skipping ~s; already processed!\n", [Dir]), process_each(Rest, Command, Config, ModuleSetFile, DirSet); false -> DirSet2 = process_dir(Dir, Config, Command, DirSet), process_each(Rest, Command, Config, ModuleSetFile, DirSet2) end. %% %% Given a list of module sets from rebar.app and a directory, find %% the appropriate subset of modules for this directory %% choose_module_set([], _Dir) -> {[], undefined}; choose_module_set([{Type, Modules} | Rest], Dir) -> case is_dir_type(Type, Dir) of {true, File} -> {Modules, File}; false -> choose_module_set(Rest, Dir) end. is_dir_type(app_dir, Dir) -> rebar_app_utils:is_app_dir(Dir); is_dir_type(rel_dir, Dir) -> rebar_rel_utils:is_rel_dir(Dir); is_dir_type(_, _) -> false. execute_pre(Command, Modules, Config, ModuleFile) -> execute_plugin_hook("pre_", Command, Modules, Config, ModuleFile). execute_post(Command, Modules, Config, ModuleFile) -> execute_plugin_hook("post_", Command, Modules, Config, ModuleFile). execute_plugin_hook(Hook, Command, Modules, Config, ModuleFile) -> HookFunction = list_to_atom(Hook ++ atom_to_list(Command)), execute(HookFunction, Modules, Config, ModuleFile). %% %% Execute a command across all applicable modules %% execute(Command, Modules, Config, ModuleFile) -> case select_modules(Modules, Command, []) of [] -> ?WARN("'~p' command does not apply to directory ~s\n", [Command, rebar_utils:get_cwd()]); TargetModules -> %% Provide some info on where we are Dir = rebar_utils:get_cwd(), ?CONSOLE("==> ~s (~s)\n", [filename:basename(Dir), Command]), %% Increment the count of operations, since some module %% responds to this command erlang:put(operations, erlang:get(operations) + 1), %% Check for and get command specific environments Env = setup_envs(Config, Modules), %% Run the available modules apply_hooks(pre_hooks, Config, Command, Env), case catch(run_modules(TargetModules, Command, Config, ModuleFile)) of ok -> apply_hooks(post_hooks, Config, Command, Env), ok; {error, failed} -> ?FAIL; {Module, {error, _} = Other} -> ?ABORT("~p failed while processing ~s in module ~s: ~s\n", [Command, Dir, Module, io_lib:print(Other, 1, 80, -1)]); Other -> ?ABORT("~p failed while processing ~s: ~s\n", [Command, Dir, io_lib:print(Other, 1, 80, -1)]) end end. update_code_path(Config) -> case rebar_config:get_local(Config, lib_dirs, []) of [] -> no_change; Paths -> OldPath = code:get_path(), LibPaths = expand_lib_dirs(Paths, rebar_utils:get_cwd(), []), ok = code:add_pathsa(LibPaths), {old, OldPath} end. restore_code_path(no_change) -> ok; restore_code_path({old, Path}) -> %% Verify that all of the paths still exist -- some dynamically %% added paths can get blown away during clean. true = code:set_path([F || F <- Path, filelib:is_file(F)]), ok. expand_lib_dirs([], _Root, Acc) -> Acc; expand_lib_dirs([Dir | Rest], Root, Acc) -> Apps = filelib:wildcard(filename:join([Dir, "*", "ebin"])), FqApps = [filename:join([Root, A]) || A <- Apps], expand_lib_dirs(Rest, Root, Acc ++ FqApps). select_modules([], _Command, Acc) -> lists:reverse(Acc); select_modules([Module | Rest], Command, Acc) -> {module, Module} = code:ensure_loaded(Module), case erlang:function_exported(Module, Command, 2) of true -> select_modules(Rest, Command, [Module | Acc]); false -> select_modules(Rest, Command, Acc) end. run_modules([], _Command, _Config, _File) -> ok; run_modules([Module | Rest], Command, Config, File) -> case Module:Command(Config, File) of ok -> run_modules(Rest, Command, Config, File); {error, _} = Error -> {Module, Error} end. apply_hooks(Mode, Config, Command, Env) -> Hooks = rebar_config:get_local(Config, Mode, []), lists:foreach(fun apply_hook/1, [{Env, Hook} || Hook <- Hooks, element(1, Hook) =:= Command]). apply_hook({Env, {Command, Hook}}) -> Msg = lists:flatten(io_lib:format("Command [~p] failed!~n", [Command])), rebar_utils:sh(Hook, [{env, Env}, {abort_on_error, Msg}]). setup_envs(Config, Modules) -> lists:flatten([M:setup_env(Config) || M <- Modules, erlang:function_exported(M, setup_env, 1)]). acc_modules(Modules, Command, Config, File) -> acc_modules(select_modules(Modules, Command, []), Command, Config, File, []). acc_modules([], _Command, _Config, _File, Acc) -> Acc; acc_modules([Module | Rest], Command, Config, File, Acc) -> {ok, Dirs} = Module:Command(Config, File), acc_modules(Rest, Command, Config, File, Acc ++ Dirs). %% %% Return a flat list of rebar plugin modules. %% plugin_modules(Config) -> Modules = lists:flatten(rebar_config:get_all(Config, rebar_plugins)), plugin_modules(Config, ulist(Modules)). ulist(L) -> ulist(L, []). ulist([], Acc) -> lists:reverse(Acc); ulist([H | T], Acc) -> case lists:member(H, Acc) of true -> ulist(T, Acc); false -> ulist(T, [H | Acc]) end. plugin_modules(_Config, []) -> {ok, []}; plugin_modules(_Config, Modules) -> FoundModules = [M || M <- Modules, code:which(M) =/= non_existing], case (Modules =:= FoundModules) of true -> ok; false -> ?WARN("Missing plugins: ~p\n", [Modules -- FoundModules]), ok end, {ok, FoundModules}.