bin: add %g options to print acceptance name

Fixes #289.

* spot/twaalgos/stats.cc, spot/twaalgos/stats.hh,
bin/common_aoutput.cc, bin/common_aoutput.hh: plug %g and %G into
acc_cond::name() when arguments are given as %[arg]g.  or %[arg]G.
* tests/core/acc2.test: Add test case.
* doc/org/randaut.org, NEWS: Document it.

NEWS

@@ -49,6 +49,17 @@ New in spot 2.4.1.dev (not yet released)
     implication-based simplification rules of ltl2tgba.  See the
     spot-x man-page for details.
 
+  - The --format=%g option of tools that output automata used to
+    print the acceptance condition as a *formula* in the HOA format.
+    This %g can now take optional arguments to print the acceptance
+    *name* in different formats.  For instance
+
+       ... | autfilt -o '%[s]g.hoa'
+
+    will separate a stream of automata into different files named
+    by their acceptance name (Buchi, co-Buchi, Streett, etc.) or
+    "other" if no name is known for the acceptance condition.
+
   Library:
 
   - Rename three methods of spot::scc_info. New names are clearer. The

bin/common_aoutput.cc

@@ -159,6 +159,21 @@ const struct argp aoutput_argp = { options, parse_opt_aoutput, nullptr, nullptr,
 char F_doc[32] = "name of the input file";
 char L_doc[32] = "location in the input file";
 
+#define doc_g                                                           \
+      "acceptance condition (in HOA syntax); add brackets to print "    \
+      "an acceptance name instead and LETTERS to tweak the format: "    \
+      "(0) no parameters, "                                             \
+      "(a) accentuated, "                                               \
+      "(b) abbreviated, "                                               \
+      "(d) style used in dot output, "                                  \
+      "(g) no generalized parameter, "                                  \
+      "(l) recognize Street-like and Rabin-like, "                      \
+      "(m) no main parameter, "                                         \
+      "(p) no parity parameter, "                                       \
+      "(o) name unknown acceptance as 'other', "                        \
+      "(s) shorthand for 'lo0'."
+
+
 static const argp_option io_options[] =
   {
     /**************************************************/
@@ -180,8 +195,8 @@ static const argp_option io_options[] =
       "number of reachable transitions", 0 },
     { "%A, %a", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "number of acceptance sets", 0 },
-    { "%G, %g", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
+    { "%G, %g, %[LETTERS]G, %[LETTERS]g", 0, nullptr,
-      "acceptance condition (in HOA syntax)", 0 },
+      OPTION_DOC | OPTION_NO_USAGE, doc_g, 0 },
     { "%C, %c, %[LETTERS]C, %[LETTERS]c", 0, nullptr,
       OPTION_DOC | OPTION_NO_USAGE,
       "number of SCCs; you may filter the SCCs to count "
@@ -241,8 +256,8 @@ static const argp_option o_options[] =
       "number of reachable transitions", 0 },
     { "%a", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "number of acceptance sets", 0 },
-    { "%g", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
+    { "%g, %[LETTERS]g", 0, nullptr,
-      "acceptance condition (in HOA syntax)", 0 },
+      OPTION_DOC | OPTION_NO_USAGE, doc_g, 0 },
     { "%c, %[LETTERS]c", 0, nullptr, OPTION_DOC | OPTION_NO_USAGE,
       "number of SCCs; you may filter the SCCs to count "
       "using the following LETTERS, possibly concatenated: (a) accepting, "
@@ -464,13 +479,9 @@ hoa_stat_printer::print(const spot::const_parsed_aut_ptr& haut,
 
       if (has('P'))
         haut_complete_ = is_complete(haut->aut);
-
       if (has('G'))
-        {
+        haut_gen_acc_ = haut->aut->acc();
-          std::ostringstream os;
+
-          os << haut->aut->get_acceptance();
-          haut_gen_acc_ = os.str();
-        }
       if (has('W'))
         {
           if (auto word = haut->aut->accepting_word())

bin/common_aoutput.hh

@@ -156,7 +156,7 @@ private:
   spot::printable_value<std::string> aut_name_;
   spot::printable_value<std::string> aut_word_;
   spot::printable_value<std::string> haut_word_;
-  spot::printable_value<std::string> haut_gen_acc_;
+  spot::printable_acc_cond haut_gen_acc_;
   spot::printable_value<unsigned> haut_states_;
   spot::printable_value<unsigned> haut_edges_;
   spot::printable_value<unsigned> haut_trans_;

doc/org/randaut.org

@@ -163,7 +163,6 @@ $txt
 #+RESULTS:
 [[file:randaut3.png]]
 
-
 * Acceptance condition
 
 The generation of the acceptance sets abn is controlled with the following four parameters:
@@ -471,6 +470,30 @@ The output format can be controlled using [[file:oaut.org][the common output opt
 like =--hoaf=, =--dot==, =--lbtt=, and =--spin=.  Note that =--spin=
 automatically implies =--ba=.
 
+Automata are send to standard output by default, by you can use =-o=
+to give a filename, or even a pattern for filenames.  For instance the
+following generates 20 automatas, but store them in different files
+according to the acceptance condition.  The format =%g= represent the
+formula for the acceptance condition and would not make a nice
+filename, but =%[s]g= is a short name for that acceptance condition
+(its is replaced by "other" if Spot does not know better).
+
+#+BEGIN_SRC sh :results verbatim :exports both
+randaut -n20 -Q10 -A 'random 3' 2 -o 'randaut-%[s]g.hoa'
+wc -l randaut-*.hoa
+#+END_SRC
+
+#+RESULTS:
+:   222 randaut-Rabin-like.hoa
+:   380 randaut-Streett-like.hoa
+:   100 randaut-generalized-Buchi.hoa
+:   249 randaut-other.hoa
+:   951 total
+
+#+BEGIN_SRC sh :results silent :exports results
+rm -f rautaut-*.hoa
+#+END_SRC
+
 * Generating a stream of automata
 
 Use option =-n= to specify a number of automata to build.  A negative

spot/twaalgos/stats.cc

@@ -331,6 +331,31 @@ namespace spot
     os << count;
   }
 
+  void printable_acc_cond::print(std::ostream& os, const char* pos) const
+  {
+    if (*pos != '[')
+      {
+        os << val_.get_acceptance();
+        return;
+      }
+    const char* beg = pos;
+    ++pos;
+    const char* end = strchr(pos, ']');
+    try
+      {
+        os << val_.name(std::string(pos, end).c_str());
+      }
+    catch (const std::runtime_error& e)
+      {
+        std::ostringstream tmp;
+        tmp << "while processing %"
+            << std::string(beg, end + 2) << ", ";
+        tmp << e.what();
+        throw std::runtime_error(tmp.str());
+
+      }
+  }
+
 
   stat_printer::stat_printer(std::ostream& os, const char* format)
     : format_(format)
@@ -397,11 +422,7 @@ namespace spot
       }
 
     if (has('g'))
-      {
+      gen_acc_ = aut->acc();
-        std::ostringstream os;
-        os << aut->get_acceptance();
-        gen_acc_ = os.str();
-      }
 
     auto& os = format(format_);
     // Make sure we do not hold a pointer to the automaton or the

spot/twaalgos/stats.hh

@@ -70,6 +70,20 @@ namespace spot
     print(std::ostream& os, const char*) const override;
   };
 
+  class SPOT_API printable_acc_cond final: public spot::printable
+  {
+    acc_cond val_;
+  public:
+    printable_acc_cond&
+    operator=(const acc_cond& new_val)
+    {
+      val_ = new_val;
+      return *this;
+    }
+
+    void print(std::ostream& os, const char* pos) const override;
+  };
+
   class SPOT_API printable_scc_info final:
     public spot::printable
   {
@@ -117,7 +131,7 @@ namespace spot
     printable_value<unsigned> nondetstates_;
     printable_value<unsigned> deterministic_;
     printable_value<unsigned> complete_;
-    printable_value<std::string> gen_acc_;
+    printable_acc_cond gen_acc_;
   };
 
   /// @}

tests/core/acc2.test

@@ -25,10 +25,22 @@ set -e
 
 ltl2tgba -H 'GFa & GFb' > in
 grep 'Acceptance:' in > expected
+grep 'acc-name:' in > expected-b
 ltl2tgba -H 'GFa & GFb' --stats='Acceptance: %a %g' > out1
+ltl2tgba -H 'GFa & GFb' --stats='acc-name: %[]g' > out1b
 autfilt -H in --format='Acceptance: %A %G' > out2
+autfilt -H in --format='acc-name: %[]G' > out2b
 diff out1 expected
 diff out2 expected
+diff out1b expected-b
+diff out2b expected-b
+
+autfilt -H in --format='%[d]G, %[0lo]g, %[0abdglmpos]g' > out3
+echo 'gen. Büchi 2, generalized-Buchi, gen. Büchi' >exp3
+diff out3 exp3
+
+autfilt -H in --format='%[bug]g' 2>err && exit 1
+grep '%\[bug\]g.*: u' err
 
 cat >header <<EOF
 HOA: v1