ltl2tgba.html: Detect ltl3ba's presence and version.

* wrap/python/ajax/ltl2tgba.html: Display the ltl3ba version, and
disable its tab when unavailable.
* wrap/python/ajax/protocol.txt: Add option for ltl3ba's version.
* wrap/python/ajax/spot.in: Implement this option, and catch
errors when ltl3ba is not installed.

wrap/python/ajax/ltl2tgba.html

@@ -8,7 +8,7 @@
     <link rel="stylesheet" href="css/ui-lightness/jquery-ui-1.8.13.custom.css">
     <link rel="stylesheet" href="css/tipTip.css">
     <link rel="stylesheet" href="css/ltl2tgba.css">
-    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
+    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
     <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js"></script>
     <script type="text/javascript" src="js/jquery.tipTip.minified.js"></script>
     <script type="text/javascript" src="js/jquery.ba-bbq.min.js"></script>
@@ -20,7 +20,6 @@
         $(".tabs").tabs();
 	$("#send").button();
 	$("#results").hide();
-        $(".tabs a").click(function() {return false;});
         $(".rtip").tipTip({maxWidth: "300px", delay: 1000,
                            edgeOffset: 10,
                            defaultPosition: "right"});
@@ -139,6 +138,18 @@
                          defaultPosition: "right"});
         });
 
+	$.get("/cgi-bin/spot.py", "o=v3", function(data) {
+            if (data != 'not available') {
+	      $("#ltl3ba-link").attr("title", data)
+		  .tipTip({maxWidth: "400px", delay: 1000,
+                           edgeOffset: 10,
+                           defaultPosition: "right"});
+            } else {
+	       var index = $('#translator-tabs a[href="#tabs-tl3"]').parent().index();
+	       $("#translator-tabs").tabs("option", "disabled", [index - 1]);
+            }
+        });
+
         function fold(ui, callback) {
             var icon = ui.children(".ui-icon");
             icon.removeClass("ui-icon-circle-arrow-n")
@@ -516,7 +527,7 @@ an identifier: <span class="formula">aUb</span> is an atomic proposition, unlike
 		</label><br>
 	      </div>
 	      <div id="tabs-tl3">
-		Use <a href="http://sourceforge.net/projects/ltl3ba/">LTL3BA</a> to build:
+		Use <a href="http://sourceforge.net/projects/ltl3ba/" id="ltl3ba-link">LTL3BA</a> to build:
 		<label class="rtip" title="Stop LTL3BA once it has built a Transition-based Generalized Büchi Automaton.  Spot will take it from here and optionally apply more optimizations.">
 		  <INPUT id="ltl3ba-T" type="radio" name="lo" value="T" checked>
 		  a TGBA

wrap/python/ajax/protocol.txt

@@ -20,6 +20,7 @@ Choosing the desired output (pick one)
   o=m     output monitor
   o=a     output automaton
   o=r     output run
+  o=v3    output LTL3BA's version  (no other argument needed)
 
 Type of formula output if o=f (pick one)
 

wrap/python/ajax/spot.in

@@ -337,6 +337,21 @@ if output_type == 'v':
     unbufprint('Spot version %s\n' % spot.version())
     finish()
 
+# ltl3ba's version
+if output_type == 'v3':
+    import subprocess
+    try:
+        l3proc = subprocess.Popen(['@LTL3BA@', '-V'], stdout=subprocess.PIPE)
+        (ver, err) = l3proc.communicate()
+        err = l3proc.returncode
+    except:
+        err = 1
+    if err != 0:
+        unbufprint('not available')
+    else:
+        unbufprint(ver.replace("\n", "<br>"))
+    finish()
+
 spot.unblock_signal(signal.SIGALRM)
 spot.unblock_signal(signal.SIGTERM)
 os.setpgrp()
@@ -515,13 +530,16 @@ elif translator == 'l3':
     import subprocess
     l3file = tmpdir + "/aut"
     l3aut = open(l3file, "w+")
-    l3proc = subprocess.Popen(args, stdout=l3aut)
-    l3aut.close()
-    ret = l3proc.wait()
+    try:
+        l3proc = subprocess.Popen(args, stdout=l3aut)
+        ret = l3proc.wait()
+    except:
+        unbufprint('<div class="error">Failed to run ltl3ba. Is it installed?</div>')
+        finish()
     if ret != 0:
-        unbufprint('''<div class="error">ltl3ba exited with error %s</div>'''
-                   % ret)
+        unbufprint('<div class="error">ltl3ba exited with error %s</div>' % ret)
         finish()
+    l3aut.close()
     tpel = spot.empty_tgba_parse_error_list()
     automaton = spot.tgba_parse(l3file, tpel, dict, env)
     if tpel: