ltl2tgta: remove options --ba, --tgba, and friends

* bin/common_post.cc, bin/common_post.hh: Add a "nooutput" variant of
the options.
* bin/ltl2tgta.cc: Use it.
* NEWS: Mention the fix.

NEWS

@@ -12,6 +12,7 @@ New in spot 2.0.2a (Not yet released)
     efficient at reducing automata (on the average).
   * The generalized testing automata displayed by the on-line
     translator were incorrect (those output by ltl2tgta were OK).
+  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
 
 New in spot 2.0.2 (2016-06-17)
 

bin/common_post.cc

@@ -39,7 +39,7 @@ enum {
   OPT_TGBA,
 };
 
-static const argp_option options[] =
+static constexpr const argp_option options[] =
   {
     /**************************************************/
     { nullptr, 0, nullptr, 0, "Output automaton type:", 2 },
@@ -72,6 +72,23 @@ static const argp_option options[] =
     { nullptr, 0, nullptr, 0, nullptr, 0 }
   };
 
+static constexpr const argp_option options_nooutput[] =
+  {
+    /**************************************************/
+    { nullptr, 0, nullptr, 0, "Simplification goal:", 20 },
+    { "small", OPT_SMALL, nullptr, 0, "prefer small automata (default)", 0 },
+    { "deterministic", 'D', nullptr, 0, "prefer deterministic automata", 0 },
+    { "any", 'a', nullptr, 0, "no preference, do not bother making it small "
+      "or deterministic", 0 },
+    /**************************************************/
+    { nullptr, 0, nullptr, 0, "Simplification level:", 21 },
+    { "low", OPT_LOW, nullptr, 0, "minimal optimizations (fast)", 0 },
+    { "medium", OPT_MEDIUM, nullptr, 0, "moderate optimizations", 0 },
+    { "high", OPT_HIGH, nullptr, 0,
+      "all available optimizations (slow, default)", 0 },
+    { nullptr, 0, nullptr, 0, nullptr, 0 }
+  };
+
 static const argp_option options_disabled[] =
   {
     /**************************************************/
@@ -169,3 +186,6 @@ const struct argp post_argp = { options, parse_opt_post,
 const struct argp post_argp_disabled = { options_disabled, parse_opt_post,
                                          nullptr, nullptr, nullptr,
                                          nullptr, nullptr };
+const struct argp post_argp_nooutput = { options_nooutput, parse_opt_post,
+                                         nullptr, nullptr, nullptr,
+                                         nullptr, nullptr };

bin/common_post.hh

 // -*- coding: utf-8 -*-
-// Copyright (C) 2012, 2013, 2014, 2015 Laboratoire de Recherche et
-// Développement de l'Epita (LRDE).
+// Copyright (C) 2012, 2013, 2014, 2015, 2016 Laboratoire de Recherche
+// et Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -23,8 +23,9 @@
 #include <spot/twaalgos/postproc.hh>
 #include <argp.h>
 
-extern const struct argp post_argp;             // postprocessing enabled
+extern const struct argp post_argp;          // postprocessing enabled
 extern const struct argp post_argp_disabled; // postprocessing disabled
+extern const struct argp post_argp_nooutput; // no output option
 
 extern spot::postprocessor::output_type type;
 extern spot::postprocessor::output_pref pref;

bin/ltl2tgta.cc

@@ -90,7 +90,7 @@ static const argp_option options[] =
 const struct argp_child children[] =
   {
     { &finput_argp, 0, nullptr, 1 },
-    { &post_argp, 0, nullptr, 20 },
+    { &post_argp_nooutput, 0, nullptr, 20 },
     { &misc_argp, 0, nullptr, -1 },
     { nullptr, 0, nullptr, 0 }
   };