Merging w/ mainline

TODO

@@ -0,0 +1,2 @@
+* write documentation
+* ZSH completion script

priv/shell-completion/bash/rebar

@@ -6,12 +6,12 @@ _rebar()
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
     prev="${COMP_WORDS[COMP_CWORD-1]}"
-    sopts="-h -v -f -j"
-    lopts=" --help --verbose --force --jobs="
+    sopts="-h -c -v -f -j"
+    lopts=" --help --commands --verbose --force --jobs="
     cmdsnvars="analyze build_plt check_plt clean compile \
         create-app create-node eunit generate \
         install int_test perf_test test \
-        case= force=1 jobs= suite= verbose=1 appid= target="
+        case= force=1 jobs= suite= verbose=1 appid= target= template="
 
     if [[ ${cur} == --* ]] ; then
         COMPREPLY=( $(compgen -W "${lopts}" -- ${cur}) )

src/rebar_core.erl

@@ -85,17 +85,10 @@ parse_args(Args) ->
     %% Parse getopt options
     OptSpecList = option_spec_list(),
     case getopt:parse(OptSpecList, Args) of
-        {ok, {_Options, []}} ->
-            %% no command to run specified
-            help(),
-            halt(1);
         {ok, {Options, NonOptArgs}} ->
-            case proplists:get_bool(help, Options) of
-                true ->
-                    %% display help
-                    help(),
-                    halt(0);
-                false ->
+            %% Check options and maybe halt execution
+            {ok, continue} = print_help_maybe_halt(Options, NonOptArgs),
+
             %% Set global variables based on getopt options
             set_global_flag(Options, verbose),
             set_global_flag(Options, force),
@@ -109,8 +102,8 @@ parse_args(Args) ->
 
             %% Filter all the flags (i.e. strings of form key=value) from the
             %% command line arguments. What's left will be the commands to run.
-                    filter_flags(NonOptArgs, [])
-            end;
+            filter_flags(NonOptArgs, []);
+
         {error, {Reason, Data}} ->
             ?ERROR("Error: ~s ~p~n~n", [Reason, Data]),
             help(),
@@ -129,6 +122,31 @@ set_global_flag(Options, Flag) ->
             end,
     rebar_config:set_global(Flag, Value).
 
+%%
+%% print help
+%%
+print_help_maybe_halt(Options, NonOptArgs) ->
+    case proplists:get_bool(help, Options) of
+        true ->
+            help(),
+            halt(0);
+        false ->
+            case proplists:get_bool(commands, Options) of
+                true ->
+                    commands(),
+                    halt(0);
+                false ->
+                    case NonOptArgs of
+                        [] ->
+                            io:format("No command to run specified!~n"),
+                            help(),
+                            halt(1);
+                        _ ->
+                            {ok, continue}
+                    end
+            end
+    end.
+
 %%
 %% print help/usage string
 %%
@@ -139,6 +157,32 @@ help() ->
                  [{"var=value", "rebar global variables (e.g. force=1)"},
                   {"command", "Command to run (e.g. compile)"}]).
 
+%%
+%% print known commands
+%%
+commands() ->
+    io:format(<<
+"analyze                              Analyze with Dialyzer~n"
+"build_plt                            Build Dialyzer PLT~n"
+"check_plt                            Check Dialyzer PLT~n"
+"~n"
+"clean                                Clean~n"
+"compile                              Compile sources~n"
+"~n"
+"create      template= [var=foo,...]  Create skel based on template and vars~n"
+"create-app                           Create simple app skel~n"
+"create-node                          Create simple node skel~n"
+"~n"
+"generate    [dump_spec=0/1]          Build release with reltool~n"
+"install     [target=]                Install build into target~n"
+"~n"
+"eunit       [suite=foo]              Run eunit [test/foo_tests.erl] tests~n"
+"~n"
+"int_test    [suite=] [case=]         Run ct suites in ./int_test~n"
+"perf_test   [suite=] [case=]         Run ct suites in ./perf_test~n"
+"test        [suite=] [case=]         Run ct suites in ./test~n"
+>>).
+
 %%
 %% options accepted via getopt
 %%
@@ -150,6 +194,7 @@ option_spec_list() ->
     [
      %% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
      {help,     $h, "help",     undefined, "Show the program options"},
+     {commands, $c, "commands", undefined, "Show available commands"},
      {verbose,  $v, "verbose",  undefined, "Be verbose about what gets done"},
      {force,    $f, "force",    undefined, "Force"},
      {jobs,     $j, "jobs",     integer,   JobsHelp}

src/rebar_templater.erl

@@ -110,7 +110,10 @@ create(_Config, _) ->
 %% Scan the current escript for available files and cache in pdict.
 %%
 cache_escript_files() ->
-    {ok, Files} = escript:foldl(fun(Name, _, GetBin, Acc) -> [{Name, GetBin()} | Acc] end,
+    {ok, Files} = rebar_utils:escript_foldl(
+                      fun(Name, _, GetBin, Acc) ->
+                              [{Name, GetBin()} | Acc]
+                      end,
                       [], rebar_config:get_global(escript, undefined)),
     erlang:put(escript_files, Files).
 

src/rebar_utils.erl

@@ -36,7 +36,8 @@
          now_str/0,
          ensure_dir/1,
          beam_to_mod/2, beams/1,
-         abort/2]).
+         abort/2,
+         escript_foldl/3]).
 
 -include("rebar.hrl").
 
@@ -111,6 +112,18 @@ abort(String, Args) ->
     ?ERROR(String, Args),
     halt(1).
 
+%% TODO: Rename emulate_escript_foldl to escript_foldl and remove
+%% this function when the time is right. escript:foldl/3 was an
+%% undocumented exported fun and is going to be removed post-R13B04.
+escript_foldl(Fun, Acc, File) ->
+    {module, zip} = code:ensure_loaded(zip),
+    case erlang:function_exported(zip, foldl, 3) of
+        true ->
+            emulate_escript_foldl(Fun, Acc, File);
+        false ->
+            escript:foldl(Fun, Acc, File)
+    end.
+
 %% ====================================================================
 %% Internal functions
 %% ====================================================================
@@ -144,3 +157,21 @@ beams(Dir) ->
     filelib:fold_files(Dir, ".*\.beam\$", true,
                        fun(F, Acc) -> [F | Acc] end, []).
 
+emulate_escript_foldl(Fun, Acc, File) ->
+    case escript:extract(File, [compile_source]) of
+        {ok, [_Shebang, _Comment, _EmuArgs, Body]} ->
+            case Body of
+                {source, BeamCode} ->
+                    GetInfo = fun() -> file:read_file_info(File) end,
+                    GetBin = fun() -> BeamCode end,
+                    {ok, Fun(".", GetInfo, GetBin, Acc)};
+                {beam, BeamCode} ->
+                    GetInfo = fun() -> file:read_file_info(File) end,
+                    GetBin = fun() -> BeamCode end,
+                    {ok, Fun(".", GetInfo, GetBin, Acc)};
+                {archive, ArchiveBin} ->
+                    zip:foldl(Fun, Acc, {File, ArchiveBin})
+            end;
+        {error, Reason} ->
+            {error, Reason}
+    end.