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%% -*- 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,
help/2]).
-include("rebar.hrl").
%% ===================================================================
%% Internal functions
%% ===================================================================
-spec help(rebar_config:config(), [atom()]) -> ok.
help(ParentConfig, Commands) ->
%% get all core modules
{ok, AnyDirModules} = application:get_env(rebar, any_dir_modules),
{ok, RawCoreModules} = application:get_env(rebar, modules),
AppDirModules = proplists:get_value(app_dir, RawCoreModules),
RelDirModules = proplists:get_value(rel_dir, RawCoreModules),
CoreModules = AnyDirModules ++ AppDirModules ++ RelDirModules,
%% get plugin modules
Predirs = [],
Dir = rebar_utils:get_cwd(),
PredirsAssoc = remember_cwd_predirs(Dir, Predirs),
Config = maybe_load_local_config(Dir, ParentConfig),
{ok, PluginModules} = plugin_modules(Config, PredirsAssoc),
AllModules = CoreModules ++ PluginModules,
lists:foreach(
fun(Cmd) ->
?CONSOLE("==> help ~p~n~n", [Cmd]),
CmdModules = select_modules(AllModules, Cmd, []),
Modules = select_modules(CmdModules, info, []),
lists:foreach(fun(M) ->
?CONSOLE("=== ~p:~p ===~n", [M, Cmd]),
M:info(help, Cmd),
?CONSOLE("~n", [])
end, Modules)
end, Commands).
-spec process_commands([atom()], rebar_config:config()) -> ok.
process_commands([], ParentConfig) ->
AbortTrapped = rebar_config:get_xconf(ParentConfig, abort_trapped, false),
case {get_operations(ParentConfig), AbortTrapped} of
{0, _} ->
%% None of the commands had any effect
?FAIL;
{_, true} ->
%% An abort was previously trapped
?FAIL;
_ ->
ok
end;
process_commands([Command | Rest], ParentConfig) ->
%% Reset skip dirs
ParentConfig1 = rebar_config:reset_skip_dirs(ParentConfig),
Operations = get_operations(ParentConfig1),
ParentConfig4 =
try
%% 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(),
{ParentConfig2, _DirSet} = process_dir(rebar_utils:get_cwd(),
Command, ParentConfig1,
sets:new()),
case get_operations(ParentConfig2) of
Operations ->
%% This command didn't do anything
?CONSOLE("Command '~p' not understood or not applicable~n",
[Command]);
_ ->
ok
end,
%% TODO: reconsider after config inheritance removal/re-design
ParentConfig3 = rebar_config:clean_config(ParentConfig1,
ParentConfig2),
%% Wipe out vsn cache to avoid invalid hits when
%% dependencies are updated
rebar_utils:init_vsn_cache(ParentConfig3)
catch
throw:rebar_abort ->
case rebar_config:get_xconf(ParentConfig1, keep_going, false) of
false ->
?FAIL;
true ->
?WARN("Continuing on after abort: ~p\n", [Rest]),
rebar_config:set_xconf(ParentConfig1,
abort_trapped, true)
end
end,
process_commands(Rest, ParentConfig4).
process_dir(Dir, Command, ParentConfig, DirSet) ->
case filelib:is_dir(Dir) of
false ->
?WARN("Skipping non-existent sub-dir: ~p\n", [Dir]),
{ParentConfig, DirSet};
true ->
WouldCd = would_cd_into_dir(Dir, Command, ParentConfig),
ok = file:set_cwd(Dir),
Config = maybe_load_local_config(Dir, 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),
ModuleSet = choose_module_set(AvailModuleSets, Dir),
skip_or_process_dir(Dir, Command, Config, DirSet, CurrentCodePath,
ModuleSet, WouldCd)
end.
would_cd_into_dir(Dir, Command, Config) ->
case would_cd_into_dir1(Dir, Command, Config) of
true ->
would_cd;
false ->
would_not_cd
end.
would_cd_into_dir1(Dir, Command, Config) ->
rebar_utils:processing_base_dir(Config, Dir) orelse
rebar_config:is_recursive(Config) orelse
is_recursive_command(Command, Config) orelse
is_generate_in_rel_dir(Command, Dir).
%% Check whether the command is part of the built-in (or extended via
%% rebar.config) list of default-recursive commands.
is_recursive_command(Command, Config) ->
{ok, AppCmds} = application:get_env(rebar, recursive_cmds),
ConfCmds = rebar_config:get_local(Config, recursive_cmds, []),
RecursiveCmds = AppCmds ++ ConfCmds,
lists:member(Command, RecursiveCmds).
%% If the directory we're about to process contains
%% reltool.config[.script] and the command to be applied is
%% 'generate', then it's safe to process. We do this to retain the
%% behavior of specifying {sub_dirs, ["rel"]} and have "rebar generate"
%% pick up rel/reltool.config[.script]. Without this workaround you'd
%% have to run "rebar -r generate" (which you don't want to do if you
%% have deps or other sub_dirs) or "cd rel && rebar generate".
is_generate_in_rel_dir(generate, Dir) ->
case rebar_rel_utils:is_rel_dir(Dir) of
{true, _} ->
true;
false ->
false
end;
is_generate_in_rel_dir(_, _) ->
false.
skip_or_process_dir(Dir, Command, Config, DirSet, CurrentCodePath,
{[], undefined}=ModuleSet, WouldCd) ->
process_dir1(Dir, Command, Config, DirSet, CurrentCodePath, ModuleSet,
WouldCd);
skip_or_process_dir(Dir, Command, Config, DirSet, CurrentCodePath,
{_, File}=ModuleSet, WouldCd) ->
case lists:suffix(".app.src", File)
orelse lists:suffix(".app", File) of
true ->
%% .app or .app.src file, check if is_skipped_app
skip_or_process_dir1(Dir, Command, Config, DirSet, CurrentCodePath,
ModuleSet, WouldCd, File);
false ->
%% not an app dir, no need to consider apps=/skip_apps=
process_dir1(Dir, Command, Config, DirSet, CurrentCodePath,
ModuleSet, WouldCd)
end.
skip_or_process_dir1(Dir, Command, Config, DirSet, CurrentCodePath, ModuleSet,
WouldCd, AppFile) ->
case rebar_app_utils:is_skipped_app(Config, AppFile) of
{Config1, {true, _SkippedApp}} when Command == 'update-deps' ->
%% update-deps does its own app skipping. Unfortunately there's no
%% way to signal this to rebar_core, so we have to explicitly do it
%% here... Otherwise if you use app=, it'll skip the toplevel
%% directory and nothing will be updated.
process_dir1(Dir, Command, Config1, DirSet, CurrentCodePath,
ModuleSet, WouldCd);
{Config1, {true, SkippedApp}} ->
?DEBUG("Skipping app: ~p~n", [SkippedApp]),
{increment_operations(Config1), DirSet};
{Config1, false} ->
process_dir1(Dir, Command, Config1, DirSet, CurrentCodePath,
ModuleSet, WouldCd)
end.
process_dir1(Dir, Command, Config, DirSet, CurrentCodePath,
{DirModules, File}, WouldCd) ->
Config0 = rebar_config:set_xconf(Config, current_command, Command),
%% 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.
{Config1, Predirs} = acc_modules(Modules, preprocess, Config0, File),
%% Remember associated pre-dirs (used for plugin lookup)
PredirsAssoc = remember_cwd_predirs(Dir, Predirs),
%% Get the list of plug-in modules from rebar.config. These
%% modules may participate in preprocess and postprocess.
{ok, PluginModules} = plugin_modules(Config1, PredirsAssoc),
AllModules = Modules ++ PluginModules,
{Config2, PluginPredirs} = acc_modules(PluginModules, preprocess, Config1,
File),
AllPredirs = Predirs ++ PluginPredirs,
?DEBUG("Predirs: ~p\n", [AllPredirs]),
{Config3, DirSet2} = process_each(AllPredirs, Command, Config2, DirSet,
File),
%% Make sure the CWD is reset properly; processing the dirs may have
%% caused it to change
ok = file:set_cwd(Dir),
%% Maybe apply command to Dir
Config4 = maybe_execute(Dir, Command, Config3, Modules, PluginModules,
AllModules, File, WouldCd),
%% 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.
{Config5, Postdirs} = acc_modules(AllModules, postprocess, Config4, File),
?DEBUG("Postdirs: ~p\n", [Postdirs]),
Res = process_each(Postdirs, Command, Config5, DirSet3, File),
%% 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 {config, dirset} as result
Res.
maybe_execute(Dir, Command, Config, Modules, PluginModules, AllModules, File,
would_cd) ->
%% Check that this directory is not on the skip list
case rebar_config:is_skip_dir(Config, Dir) of
true ->
%% Do not execute the command on the directory, as some
%% module has requested a skip on it.
?INFO("Skipping ~s in ~s\n", [Command, Dir]),
Config;
false ->
%% Check for and get command specific environments
{Config1, Env} = setup_envs(Config, Modules),
%% Execute any before_command plugins on this directory
Config2 = execute_pre(Command, PluginModules, Config1, File, Env),
%% Execute the current command on this directory
Config3 = execute(Command, AllModules, Config2, File, Env),
%% Execute any after_command plugins on this directory
execute_post(Command, PluginModules, Config3, File, Env)
end;
maybe_execute(_Dir, _Command, Config, _Modules, _PluginModules, _AllModules,
_File, would_not_cd) ->
Config.
remember_cwd_predirs(Cwd, Predirs) ->
Store = fun(Dir, Dict) ->
case dict:find(Dir, Dict) of
error ->
?DEBUG("Associate sub_dir ~s with ~s~n",
[Dir, Cwd]),
dict:store(Dir, Cwd, Dict);
{ok, Existing} ->
?ABORT("Internal consistency assertion failed.~n"
"sub_dir ~s already associated with ~s.~n"
"Duplicate sub_dirs or deps entries?~n",
[Dir, Existing])
end
end,
lists:foldl(Store, dict:new(), Predirs).
maybe_load_local_config(Dir, ParentConfig) ->
%% We need to ensure we don't overwrite custom
%% config when we are dealing with base_dir.
case rebar_utils:processing_base_dir(ParentConfig, Dir) of
true ->
ParentConfig;
false ->
rebar_config:new(ParentConfig)
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, DirSet, _File) ->
%% reset cached (setup_env) envs
Config1 = rebar_config:reset_envs(Config),
{Config1, DirSet};
process_each([Dir | Rest], Command, Config, DirSet, File) ->
case sets:is_element(Dir, DirSet) of
true ->
?DEBUG("Skipping ~s; already processed!\n", [Dir]),
process_each(Rest, Command, Config, DirSet, File);
false ->
{Config1, DirSet2} = process_dir(Dir, Command, Config, DirSet),
Config2 = rebar_config:clean_config(Config, Config1),
%% reset cached (setup_env) envs
Config3 = rebar_config:reset_envs(Config2),
process_each(Rest, Command, Config3, DirSet2, File)
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, Env) ->
execute_plugin_hook("pre_", Command, Modules,
Config, ModuleFile, Env).
execute_post(Command, Modules, Config, ModuleFile, Env) ->
execute_plugin_hook("post_", Command, Modules,
Config, ModuleFile, Env).
execute_plugin_hook(Hook, Command, Modules, Config, ModuleFile, Env) ->
HookFunction = list_to_atom(Hook ++ atom_to_list(Command)),
execute(HookFunction, hook, Modules, Config, ModuleFile, Env).
%%
%% Execute a command across all applicable modules
%%
execute(Command, Modules, Config, ModuleFile, Env) ->
execute(Command, not_a_hook, Modules, Config, ModuleFile, Env).
execute(Command, Type, Modules, Config, ModuleFile, Env) ->
case select_modules(Modules, Command, []) of
[] ->
case Type of
hook ->
ok;
not_a_hook ->
?WARN("'~p' command does not apply to directory ~s\n",
[Command, rebar_utils:get_cwd()])
end,
Config;
TargetModules ->
%% Provide some info on where we are
Dir = rebar_utils:get_cwd(),
?CONSOLE("==> ~s (~s)\n", [filename:basename(Dir), Command]),
Config1 = increment_operations(Config),
%% Run the available modules
apply_hooks(pre_hooks, Config1, Command, Env),
case catch(run_modules(TargetModules, Command,
Config1, ModuleFile)) of
{ok, NewConfig} ->
apply_hooks(post_hooks, NewConfig, Command, Env),
NewConfig;
{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.
%% Increment the count of operations, since some module
%% responds to this command
increment_operations(Config) ->
Operations = get_operations(Config),
rebar_config:set_xconf(Config, operations, Operations + 1).
get_operations(Config) ->
rebar_config:get_xconf(Config, operations).
update_code_path(Config) ->
case rebar_config:get_local(Config, lib_dirs, []) of
[] ->
no_change;
Paths ->
LibPaths = expand_lib_dirs(Paths, rebar_utils:get_cwd(), []),
ok = code:add_pathsa(LibPaths),
%% track just the paths we added, so we can remove them without
%% removing other paths added by this dep
{added, LibPaths}
end.
restore_code_path(no_change) ->
ok;
restore_code_path({added, Paths}) ->
%% Verify that all of the paths still exist -- some dynamically
%% added paths can get blown away during clean.
_ = [code:del_path(F) || F <- Paths, erl_prim_loader_is_file(F)],
ok.
erl_prim_loader_is_file(File) ->
erl_prim_loader:read_file_info(File) =/= error.
expand_lib_dirs([], _Root, Acc) ->
Acc;
expand_lib_dirs([Dir | Rest], Root, Acc) ->
Apps = filelib:wildcard(filename:join([Dir, "*", "ebin"])),
FqApps = case filename:pathtype(Dir) of
absolute -> Apps;
_ -> [filename:join([Root, A]) || A <- Apps]
end,
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, Config};
run_modules([Module | Rest], Command, Config, File) ->
case Module:Command(Config, File) of
ok ->
run_modules(Rest, Command, Config, File);
{ok, NewConfig} ->
run_modules(Rest, Command, NewConfig, File);
{error, _} = Error ->
{Module, Error}
end.
apply_hooks(Mode, Config, Command, Env0) ->
Hooks = rebar_config:get_local(Config, Mode, []),
Env = rebar_utils:patch_env(Config, Env0),
lists:foreach(fun apply_hook/1,
[{Env, Hook} || Hook <- Hooks,
element(1, Hook) =:= Command orelse
element(2, Hook) =:= Command]).
apply_hook({Env, {Arch, Command, Hook}}) ->
case rebar_utils:is_arch(Arch) of
true ->
apply_hook({Env, {Command, Hook}});
false ->
ok
end;
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:foldl(fun(M, {C,E}=T) ->
case erlang:function_exported(M, setup_env, 1) of
true ->
Env = M:setup_env(C),
C1 = rebar_config:save_env(C, M, Env),
{C1, E++Env};
false ->
T
end
end, {Config, []}, Modules).
acc_modules(Modules, Command, Config, File) ->
acc_modules(select_modules(Modules, Command, []),
Command, Config, File, []).
acc_modules([], _Command, Config, _File, Acc) ->
{Config, Acc};
acc_modules([Module | Rest], Command, Config, File, Acc) ->
{Config1, Dirs1} = case Module:Command(Config, File) of
{ok, Dirs} ->
{Config, Dirs};
{ok, NewConfig, Dirs} ->
{NewConfig, Dirs}
end,
acc_modules(Rest, Command, Config1, File, Acc ++ Dirs1).
%%
%% Return a flat list of rebar plugin modules.
%%
plugin_modules(Config, PredirsAssoc) ->
Modules = lists:flatten(rebar_config:get_all(Config, plugins)),
?DEBUG("Plugins requested while processing ~s: ~p~n",
[rebar_utils:get_cwd(), Modules]),
plugin_modules(Config, PredirsAssoc, 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, _PredirsAssoc, []) ->
{ok, []};
plugin_modules(Config, PredirsAssoc, Modules) ->
FoundModules = [M || M <- Modules, code:which(M) =/= non_existing],
plugin_modules(Config, PredirsAssoc, FoundModules, Modules -- FoundModules).
plugin_modules(_Config, _PredirsAssoc, FoundModules, []) ->
{ok, FoundModules};
plugin_modules(Config, PredirsAssoc, FoundModules, MissingModules) ->
{Loaded, NotLoaded} = load_plugin_modules(Config, PredirsAssoc,
MissingModules),
AllViablePlugins = FoundModules ++ Loaded,
case NotLoaded =/= [] of
true ->
%% NB: we continue to ignore this situation, as did the
%% original code
?WARN("Missing plugins: ~p\n", [NotLoaded]);
false ->
?DEBUG("Loaded plugins: ~p~n", [AllViablePlugins]),
ok
end,
{ok, AllViablePlugins}.
load_plugin_modules(Config, PredirsAssoc, Modules) ->
Cwd = rebar_utils:get_cwd(),
PluginDirs = get_all_plugin_dirs(Config, Cwd, PredirsAssoc),
?DEBUG("Plugin dirs for ~s:~n~p~n", [Cwd, PluginDirs]),
%% Find relevant sources in base_dir and plugin_dir
RE = string:join([atom_to_list(M)++"\\.erl" || M <- Modules], "|"),
%% If a plugin is found both in base_dir and plugin_dir, the clash
%% will provoke an error and we'll abort.
Sources = [rebar_utils:find_files(PD, RE, false) || PD <- PluginDirs],
%% Compile and load plugins
Loaded = [load_plugin(Src) || Src <- lists:append(Sources)],
FilterMissing = is_missing_plugin(Loaded),
NotLoaded = [V || V <- Modules, FilterMissing(V)],
{Loaded, NotLoaded}.
get_all_plugin_dirs(Config, Cwd, PredirsAssoc) ->
[rebar_utils:get_cwd()]
++ get_plugin_dir(Config, Cwd)
++ get_base_plugin_dirs(Cwd, PredirsAssoc).
get_plugin_dir(Config, Cwd) ->
case rebar_config:get_local(Config, plugin_dir, undefined) of
undefined ->
%% Plugin can be in the project's "plugins" folder
[filename:join(Cwd, "plugins")];
Dir ->
[Dir]
end.
%% We also want to include this case:
%% Plugin can be in "plugins" directory of the plugin base directory.
%% For example, Cwd depends on Plugin, and deps/Plugin/plugins/Plugin.erl
%% is the plugin.
get_base_plugin_dirs(Cwd, PredirsAssoc) ->
[filename:join(Dir, "plugins") ||
Dir <- get_plugin_base_dirs(Cwd, PredirsAssoc)].
%% @doc PredirsAssoc is a dictionary of plugindir -> 'parent' pairs.
%% 'parent' in this case depends on plugin; therefore we have to give
%% all plugins that Cwd ('parent' in this case) depends on.
get_plugin_base_dirs(Cwd, PredirsAssoc) ->
[PluginDir || {PluginDir, Master} <- dict:to_list(PredirsAssoc),
Master =:= Cwd].
is_missing_plugin(Loaded) ->
fun(Mod) -> not lists:member(Mod, Loaded) end.
load_plugin(Src) ->
case compile:file(Src, [binary, return_errors]) of
{ok, Mod, Bin} ->
load_plugin_module(Mod, Bin, Src);
{error, Errors, _Warnings} ->
?ABORT("Plugin ~s contains compilation errors: ~p~n",
[Src, Errors])
end.
load_plugin_module(Mod, Bin, Src) ->
case code:is_loaded(Mod) of
{file, Loaded} ->
?ABORT("Plugin ~p clashes with previously loaded module ~p~n",
[Mod, Loaded]);
false ->
?INFO("Loading plugin ~p from ~s~n", [Mod, Src]),
{module, Mod} = code:load_binary(Mod, Src, Bin),
Mod
end.