hoa: simplify the interface of hoa_reachable()

* src/tgbaalgos/hoa.cc, src/tgbaalgos/hoa.hh: Only
keep one function public, and do not pass the formula.
* src/tgbatest/ltl2tgba.cc: Adjust.

src/tgbaalgos/hoa.hh

@@ -1,6 +1,6 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2014 Laboratoire de Recherche et Développement de
-// l'Epita (LRDE).
+// Copyright (C) 2014, 2015 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -21,46 +21,23 @@
 # define SPOT_TGBAALGOS_HOA_HH
 
 #include <iosfwd>
-#include "ltlast/formula.hh"
+#include "misc/common.hh"
 #include "tgba/fwd.hh"
 
 namespace spot
 {
-  enum hoa_alias { Hoa_Alias_None, Hoa_Alias_Ap, Hoa_Alias_Cond };
-  enum hoa_acceptance
-    {
-      Hoa_Acceptance_States,	/// state-based acceptance if
-				/// (globally) possible
-				/// transition-based acceptance
-				/// otherwise.
-      Hoa_Acceptance_Transitions, /// transition-based acceptance globally
-      Hoa_Acceptance_Mixed    /// mix state-based and transition-based
-    };
-
   /// \ingroup tgba_io
   /// \brief Print reachable states in Hanoi Omega Automata format.
   ///
   /// \param os The output stream to print on.
   /// \param g The automaton to output.
-  /// \param f The (optional) formula associated to the automaton.  If given
-  ///          it will be output as a comment.
-  /// \param acceptance Force the type of acceptance mode used
-  ///         in output.
-  /// \param alias Whether aliases should be used in output.
-  /// \param newlines Whether to use newlines in output.
+  /// \param opt a set of characters each corresponding to a possible
+  ///        option: (s) state-based acceptance, (t) transition-based
+  ///        acceptance, (m) mixed acceptance, (l) single-line output.
   SPOT_API std::ostream&
   hoa_reachable(std::ostream& os,
 		const const_tgba_ptr& g,
-		const ltl::formula* f = 0,
-		hoa_acceptance acceptance = Hoa_Acceptance_States,
-		hoa_alias alias = Hoa_Alias_None,
-		bool newlines = true);
-
-  SPOT_API std::ostream&
-  hoa_reachable(std::ostream& os,
-		const const_tgba_ptr& g,
-		const char* opt,
-		const ltl::formula* f = 0);
+		const char* opt);
 }
 
 #endif // SPOT_TGBAALGOS_HOA_HH