summaryrefslogtreecommitdiff
path: root/src/rebar_core.erl
blob: 9a8814d6c85914b0edf5ba09b5bc5437b554c570 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
%% -*- 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}.