dot: --dot=1 to ignore names and force numbered states

Fixes #78.

* src/twaalgos/dotty.cc: Add option '1'.
* src/taalgos/dotty.cc: Ignore '1'.
* src/bin/dstar2tgba.cc, src/bin/common_aoutput.cc: Document it.
* src/tests/readsave.test: Test it.

src/bin/common_aoutput.cc

@@ -51,8 +51,9 @@ static const argp_option options[] =
   {
     /**************************************************/
     { 0, 0, 0, 0, "Output format:", 3 },
-    { "dot", OPT_DOT, "a|b|c|f(FONT)|h|n|N|r|R|s|t|v", OPTION_ARG_OPTIONAL,
+    { "dot", OPT_DOT, "1|a|b|c|f(FONT)|h|n|N|o|r|R|s|t|v", OPTION_ARG_OPTIONAL,
       "GraphViz's format (default).  Add letters for "
+      "(1) force numbered states, "
       "(a) acceptance display, (b) acceptance sets as bullets, "
       "(c) circular nodes, (f(FONT)) use FONT, (h) horizontal layout, "
       "(v) vertical layout, (n) with name, (N) without name, "

src/bin/dstar2tgba.cc

@@ -73,8 +73,9 @@ static const argp_option options[] =
       "of the given property)", 0 },
     /**************************************************/
     { 0, 0, 0, 0, "Output format:", 3 },
-    { "dot", OPT_DOT, "a|b|c|f(FONT)|h|n|N|r|R|s|t|v", OPTION_ARG_OPTIONAL,
+    { "dot", OPT_DOT, "1|a|b|c|f(FONT)|h|n|N|o|r|R|s|t|v", OPTION_ARG_OPTIONAL,
       "GraphViz's format (default).  Add letters for "
+      "(1) force numbered states, "
       "(a) acceptance display, (b) acceptance sets as bullets, "
       "(c) circular nodes, (f(FONT)) use FONT, (h) horizontal layout, "
       "(v) vertical layout, (n) with name, (N) without name, "

src/taalgos/dotty.cc

@@ -84,6 +84,7 @@ namespace spot
 	    case 'v':
 	      opt_horizontal_ = false;
 	      break;
+	    case '1':
 	    case 'a':
 	    case 'b':
 	    case 'n':

src/tests/readsave.test

@@ -510,6 +510,28 @@ EOF
 $autfilt --dot=bao in >out
 diff out expected
 
+cat >expected2 <<EOF
+digraph G {
+  rankdir=LR
+  label="Fin(⓿) | (Fin(❶) & Inf(❷)) | Fin(❸)"
+  labelloc="t"
+  I [label="", style=invis, width=0]
+  0 [label="0"]
+  1 [label="1\n⓿❸"]
+  2 [label="2\n⓿❷❸"]
+  3 [label="3\n❸"]
+  4 [label="4\n❷❸"]
+  5 [label="5\n❶❸"]
+  6 [label="6\n⓿"]
+  7 [label="7\n⓿❷"]
+  8 [label="8\n⓿❸"]
+  9 [label="9\n⓿❷❸"]
+}
+EOF
+
+# This should remove the state names
+$autfilt --dot=bao1 in | grep -v '>' >out
+diff out expected2
 
 # Let's pretend that this is some used supplied input, as discussed in
 # the comments of https://github.com/adl/hoaf/issues/39

src/twaalgos/dotty.cc

@@ -53,7 +53,7 @@ namespace spot
       bool opt_scc_ = false;
       bool opt_html_labels_ = false;
       const_twa_graph_ptr aut_;
-      std::vector<std::string>* sn_;
+      std::vector<std::string>* sn_ = nullptr;
       std::string* name_ = nullptr;
       acc_cond::mark_t inf_sets_ = 0U;
       acc_cond::mark_t fin_sets_ = 0U;
@@ -61,6 +61,7 @@ namespace spot
       bool opt_bullet = false;
       bool opt_all_bullets = false;
       bool opt_numbered_trans = false;
+      bool opt_want_state_names_ = true;
       std::string opt_font_;
 
       const char* const palette9[9] =
@@ -107,6 +108,9 @@ namespace spot
 		  parse_opts(def.c_str());
 		break;
 	      }
+	    case '1':
+	      opt_want_state_names_ = false;
+	      break;
 	    case 'a':
 	      opt_show_acc_ = true;
 	      break;
@@ -436,6 +440,7 @@ namespace spot
       void print(const const_twa_graph_ptr& aut)
       {
 	aut_ = aut;
+	if (opt_want_state_names_)
 	  sn_ = aut->get_named_prop<std::vector<std::string>>("state-names");
 	if (opt_name_)
 	  name_ = aut_->get_named_prop<std::string>("automaton-name");