Change default log level to 'warn' and introduce -q/--quiet

ebin/rebar.app

@@ -50,7 +50,7 @@
                   tools]},
   {env, [
          %% Default log level
-         {log_level, error},
+         {log_level, warn},
 
          %% any_dir processing modules
          {any_dir_modules, [

inttest/logging/logging_rt.erl

@@ -0,0 +1,99 @@
+-module(logging_rt).
+-export([files/0,
+         run/1]).
+
+-define(APP_FILE, "ebin/logging.app").
+
+files() ->
+    [
+     {copy, "../../rebar", "rebar"},
+     {create, ?APP_FILE, app(invalid_name, [])}
+    ].
+
+run(_Dir) ->
+    SharedExpected = "==> logging_rt \\(compile\\)",
+    %% provoke ERROR due to an invalid app file
+    retest:log(info, "Check 'compile' failure output~n"),
+    ok = check_output("./rebar compile -q", should_fail,
+                      [SharedExpected, "ERROR: "],
+                      ["WARN: ", "INFO: ", "DEBUG: "]),
+    %% fix bad app file
+    ok = file:write_file(?APP_FILE, app(logging, [])),
+    retest:log(info, "Check 'compile' success output~n"),
+    ok = check_output("./rebar compile", should_succeed,
+                      [SharedExpected],
+                      ["ERROR: ", "WARN: ", "INFO: ", "DEBUG: "]),
+    retest:log(info, "Check 'compile -v' success output~n"),
+    ok = check_output("./rebar compile -v", should_succeed,
+                      [SharedExpected],
+                      ["ERROR: ", "INFO: ", "DEBUG: "]),
+    retest:log(info, "Check 'compile -vv' success output~n"),
+    ok = check_output("./rebar compile -vv", should_succeed,
+                      [SharedExpected, "DEBUG: "],
+                      ["ERROR: ", "INFO: "]),
+    ok.
+
+check_output(Cmd, FailureMode, Expected, Unexpected) ->
+    case {retest:sh(Cmd), FailureMode} of
+        {{error, _}=Error, should_succeed} ->
+            retest:log(error, "cmd '~s' failed:~n~p~n", [Cmd, Error]),
+            Error;
+        {{ok, Captured}, should_succeed} ->
+            Joined = string:join(Captured, "\n"),
+            check_output1(Cmd, Joined, Expected, Unexpected);
+        {{error, {stopped, {_Rc, Captured}}}, should_fail} ->
+            Joined = string:join(Captured, "\n"),
+            check_output1(Cmd, Joined, Expected, Unexpected)
+    end.
+
+check_output1(Cmd, Captured, Expected, Unexpected) ->
+    ReOpts = [{capture, all, list}],
+    ExMatches =
+        lists:zf(
+          fun(Pattern) ->
+                  case re:run(Captured, Pattern, ReOpts) of
+                      nomatch ->
+                          retest:log(error,
+                                     "Expected pattern '~s' missing "
+                                     "in the following output:~n"
+                                     "=== BEGIN ===~n~s~n=== END ===~n",
+                                     [Pattern, Captured]),
+                          {true, Pattern};
+                      {match, _} ->
+                          false
+                  end
+          end, Expected),
+
+    UnExMatches =
+        lists:zf(
+          fun(Pattern) ->
+                  case re:run(Captured, Pattern, ReOpts) of
+                      nomatch ->
+                          false;
+                      {match, [Match]} ->
+                          retest:log(
+                            console,
+                            "Unexpected output when running cmd '~s':~n~s~n",
+                            [Cmd, Match]),
+                          {true, Match}
+                  end
+          end, Unexpected),
+
+    case {ExMatches, UnExMatches} of
+        {[], []} ->
+            ok;
+        _ ->
+            error
+    end.
+
+%%
+%% Generate the contents of a simple .app file
+%%
+app(Name, Modules) ->
+    App = {application, Name,
+           [{description, atom_to_list(Name)},
+            {vsn, "1"},
+            {modules, Modules},
+            {registered, []},
+            {applications, [kernel, stdlib]}]},
+    io_lib:format("~p.\n", [App]).

inttest/t_custom_config/t_custom_config_rt.erl

@@ -11,7 +11,7 @@ files() ->
 
 run(Dir) ->
     retest_log:log(debug, "Running in Dir: ~s~n", [Dir]),
-    Ref = retest:sh("./rebar -C custom.config check-deps -vvv",
+    Ref = retest:sh("./rebar -C custom.config check-deps -vv",
                     [{async, true}]),
     {ok, Captured} =
         retest:sh_expect(Ref,

priv/shell-completion/zsh/_rebar

@@ -7,10 +7,10 @@ _rebar_global_opts=(
   '(--help -h)'{--help,-h}'[Show the program options]'
   '(--commands -c)'{--commands,-c}'[Show available commands]'
   '(--version -V)'{--version,-V}'[Show version information]'
-  '(-vvv -vv -v)'--verbose+'[Verbosity level. Default: 0]:verbosity level:(0 1 2 3)'
-  '(-vvv)-v[Slightly more verbose output]'
-  '(-vvv)-vv[More verbose output]'
-  '(-v -vv)-vvv[Most verbose output]'
+  '(-vv -v)'--verbose'[Enforce verbosity level]'
+  '(-vv)-v[Slightly more verbose output]'
+  '(-v)-vv[More verbose output]'
+  '(-vv -v --verbose)'{--quiet,-q}'[Quiet, only print error messages]'
   '(--force -f)'{--force,-f}'[Force]'
   '-D+[Define compiler macro]'
   '(--jobs -j)'{--jobs+,-j+}'[Number of concurrent workers a command may use. Default: 3]:workers:(1 2 3 4 5 6 7 8 9)'

src/rebar.erl

@@ -258,13 +258,20 @@ save_options(Config, {Options, NonOptArgs}) ->
 %% set log level based on getopt option
 %%
 set_log_level(Config, Options) ->
-    LogLevel = case proplists:get_all_values(verbose, Options) of
-                   [] ->
-                       rebar_log:default_level();
-                   Verbosities ->
-                       lists:last(Verbosities)
-               end,
-    rebar_config:set_global(Config, verbose, LogLevel).
+    Level = case proplists:get_bool(quiet, Options) of
+                true ->
+                    rebar_log:error_level();
+                false ->
+                    DefaultLevel = rebar_log:default_level(),
+                    case proplists:get_all_values(verbose, Options) of
+                        [] ->
+                            DefaultLevel;
+                        Verbosities ->
+                            DefaultLevel + lists:last(Verbosities)
+                    end
+            end,
+
+    rebar_config:set_global(Config, verbose, Level).
 
 %%
 %% show version information and halt
@@ -375,12 +382,12 @@ option_spec_list() ->
     JobsHelp = io_lib:format(
                  "Number of concurrent workers a command may use. Default: ~B",
                  [Jobs]),
-    VerboseHelp = "Verbosity level (-v, -vv, -vvv, --verbose 3). Default: 0",
     [
      %% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
      {help,     $h, "help",     undefined, "Show the program options"},
      {commands, $c, "commands", undefined, "Show available commands"},
-     {verbose,  $v, "verbose",  integer,   VerboseHelp},
+     {verbose,  $v, "verbose",  integer,   "Verbosity level (-v, -vv)"},
+     {quiet,    $q, "quiet",    boolean,   "Quiet, only print error messages"},
      {version,  $V, "version",  undefined, "Show version information"},
      {force,    $f, "force",    undefined, "Force"},
      {defines,  $D, undefined,  string,    "Define compiler macro"},

src/rebar_log.erl

@@ -27,7 +27,9 @@
 -module(rebar_log).
 
 -export([init/1,
-         set_level/1, default_level/0,
+         set_level/1,
+         error_level/0,
+         default_level/0,
          log/3]).
 
 -define(ERROR_LEVEL, 0).
@@ -60,6 +62,7 @@ log(Level, Str, Args) ->
             ok
     end.
 
+error_level() -> ?ERROR_LEVEL.
 default_level() -> ?WARN_LEVEL.
 
 %% ===================================================================
@@ -69,8 +72,6 @@ default_level() -> ?WARN_LEVEL.
 valid_level(Level) ->
     erlang:max(?ERROR_LEVEL, erlang:min(Level, ?DEBUG_LEVEL)).
 
-error_level() -> ?ERROR_LEVEL.
-
 should_log(debug, _)     -> true;
 should_log(info, debug)  -> false;
 should_log(info, _)      -> true;