From 1946ca7a51df0acb35d8e2ea001d194f1d2ccb12 Mon Sep 17 00:00:00 2001
From: Stefano Zacchiroli <zack@upsilon.cc>
Date: Mon, 19 Sep 2005 12:41:02 +0000
Subject: [PATCH] - added support for -debug, which avoid catching top level
 exceptions (still useless until we find a way to let the program die on
 uncaught exceptions raised by gtk callbacks) - enable whelp syntax on command
 line - uses Arg for command line parsing

---
 helm/matita/matita.ml | 52 +++++++++++++++++++++++++++++++++----------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/helm/matita/matita.ml b/helm/matita/matita.ml
index 38c161424..bc06a56e5 100644
--- a/helm/matita/matita.ml
+++ b/helm/matita/matita.ml
@@ -157,23 +157,51 @@ let _ =
   end
   (** Debugging }}} *)
 
+  (** {2 Command line parsing} *)
+
+let debug = ref false
+let args = ref []
+let add_arg arg = args := arg :: !args
+
+let arg_spec =
+  let std_arg_spec = [] in
+  let debug_arg_spec =
+    if BuildTimeConf.debug then
+      [ "-debug", Arg.Set debug,
+        "Do not catch top-level exception (useful for backtrace inspection)"; ]
+    else []
+  in
+  std_arg_spec @ debug_arg_spec
+
+let usage () =
+  let heading = sprintf "Matita v%s\nUsage: " BuildTimeConf.version in
+  if Helm_registry.get "matita.mode" = "cicbrowser" then
+    heading ^ "cicbrowser [ URL | Whelp query ]\nOptions:"
+  else
+    heading ^  "matita [ FILE ]"
+
+let set_matita_mode () =
+  let matita_mode =
+    if Filename.basename Sys.argv.(0) = "cicbrowser"
+    then "cicbrowser"
+    else "matita"
+  in
+  Helm_registry.set "matita.mode" matita_mode
+
+  (** {2 Main} *)
+
 let _ =
+  set_matita_mode ();
+  Arg.parse arg_spec add_arg (usage ());
+  Helm_registry.set_bool "matita.catch_top_level_exn" (not !debug);
   at_exit (fun () -> print_endline "\nThanks for using Matita!\n");
   Sys.catch_break true;
-  if Filename.basename Sys.argv.(0) = "cicbrowser" then begin (* cicbrowser *)
-    Helm_registry.set "matita.mode" "cicbrowser";
+  if Helm_registry.get "matita.mode" = "cicbrowser" then  (* cicbrowser *)
     let browser = MatitaMathView.cicBrowser () in
-    let uri =
-      try
-        String.concat " " (List.tl (Array.to_list Sys.argv))
-      with Failure _ -> "cic:/"
-    in
+    let uri = match !args with [] -> "cic:/" | _ -> String.concat " " !args in
     browser#loadInput uri
-  end else begin  (* matita *)
-    Helm_registry.set "matita.mode" "matita";
-    (try
-       gui#loadScript Sys.argv.(1);
-     with Invalid_argument _ -> ());
+  else begin  (* matita *)
+    (try gui#loadScript (List.hd !args) with Failure _ -> ());
     gui#main#mainWin#show ();
   end;
   try
-- 
2.39.2