Bugfixes in MH show

* mh/show.c: Set cur before returning.  Allow for arguments in
showproc settings.  Move to next or prev if invoked with the
corresponding argv[0]

* mh/mh.h (mh_msgset_parse): def argument is const.
(mh_msgset_first_current, mh_msgset_first_uid): Remove proto.
(mh_msgset_first): Change signature.
(mh_msgset_last): New function.
* mh/mh_msgset.c (mh_msgset_first): Return UID or message number
depending on the value of the second parameter.
(mh_msgset_first_current, mh_msgset_first_uid): Remove.
(mh_msgset_last): New function.

* mh/anno.c: Update.
* mh/comp.c: Update.
* mh/folder.c: Update.
* mh/mh_init.c: Update.
* mh/repl.c: Update.

* mh/Makefile.am (install-exec-hook): Link show to prev and next

@@ -170,6 +170,8 @@ mh_alias_lex.c: $(srcdir)/mh_alias.l mh_alias.h
 install-exec-hook: 
 	@here=`pwd`; \
 	cd $(DESTDIR)$(bindir); \
-	rm -f folders; \
+	rm -f folders next prev; \
 	$(LN_S) folder folders; \
+        $(LN_S) show next; \
+        $(LN_S) show prev; \
 	cd $$here

@@ -110,7 +110,7 @@ main (int argc, char **argv)
       exit (1);
     }
       
-  mh_msgset_first_current (mbox, msgset);
+  mh_mailbox_set_cur (mbox, mh_msgset_first (msgset, RET_UID));
   mu_msgset_free (msgset);
   mh_global_save_state ();
   mu_mailbox_sync (mbox);

@@ -189,7 +189,8 @@ main (int argc, char **argv)
 		  mu_error (_("only one message at a time!"));
 		  return 1;
 		}
-	      draftmessage = (char*) mu_umaxtostr (0, mh_msgset_first_uid (msgset));
+	      draftmessage =
+		(char*) mu_umaxtostr (0, mh_msgset_first (msgset, RET_UID));
 	      mu_msgset_free (msgset);
 	      mu_mailbox_destroy (&mbox);
 	    }
@@ -213,7 +214,7 @@ main (int argc, char **argv)
 	  return 1;
 	}
       unlink (wh_env.file);
-      copy_message (mbox, mh_msgset_first (msgset), wh_env.file);
+      copy_message (mbox, mh_msgset_first (msgset, RET_MSGNO), wh_env.file);
       mu_mailbox_destroy (&mbox);
       mu_msgset_free (msgset);
     }

@@ -914,7 +914,7 @@ main (int argc, char **argv)
       mu_mailbox_t mbox = mh_open_folder (mh_current_folder (),
 					  MU_STREAM_RDWR);
       mh_msgset_parse (&msgset, mbox, argc - index, argv + index, "cur");
-      mh_msgset_first_current (mbox, msgset);
+      mh_mailbox_set_cur (mbox, mh_msgset_first (msgset, RET_UID));
       mu_msgset_free (msgset);
       mh_global_save_state ();
       mu_mailbox_close (mbox);

@@ -300,12 +300,13 @@ int mh_message_number (mu_message_t msg, size_t *pnum);
 mu_mailbox_t mh_open_folder (const char *folder, int flags);
 
 void mh_msgset_parse (mu_msgset_t *msgset, mu_mailbox_t mbox, 
-		      int argc, char **argv, char *def);
+		      int argc, char **argv, const char *def);
 void mh_msgset_parse_string (mu_msgset_t *msgset, mu_mailbox_t mbox, 
-			     const char *string, char *def);
-void mh_msgset_first_current (mu_mailbox_t mbox, mu_msgset_t msgset);
-size_t mh_msgset_first (mu_msgset_t msgset);
-size_t mh_msgset_first_uid (mu_msgset_t msgset);
+			     const char *string, const char *def);
+#define RET_MSGNO 0
+#define RET_UID   1
+size_t mh_msgset_first (mu_msgset_t msgset, int uid);
+size_t mh_msgset_last  (mu_msgset_t msgset, int uid);
 int mh_msgset_single_message (mu_msgset_t msgset);
 
 #define NAME_ANY    0

@@ -1026,7 +1026,7 @@ mh_draft_message (const char *name, const char *msgspec, char **pname)
       if (!mh_msgset_single_message (msgset))
 	mu_error (_("only one message at a time!"));
       else
-	uid = mh_msgset_first_uid (msgset);
+	uid = mh_msgset_first (msgset, RET_UID);
       mu_msgset_free (msgset);
     }
 

@@ -21,51 +21,47 @@
 #include <mailutils/sys/msgset.h>
 
 size_t
-mh_msgset_first (mu_msgset_t msgset)
+mh_msgset_first (mu_msgset_t msgset, int uid)
 {
-  mu_list_t list;
-  struct mu_msgrange *r;
-  int rc;
-  
-  rc = mu_msgset_get_list (msgset, &list);
+  size_t n;
+  int rc = mu_msgset_first (msgset, &n);
   if (rc)
     {
-      mu_diag_funcall (MU_DIAG_ERROR, "mu_msgset_get_list", NULL, rc);
+      mu_diag_funcall (MU_DIAG_ERROR, "mu_msgset_first", NULL, rc);
       exit (1);
     }
-  rc = mu_list_head (list, (void**)&r);
-  if (rc)
+  if (uid)
     {
-      mu_diag_funcall (MU_DIAG_ERROR, "mu_list_get", NULL, rc);
-      exit (1);
+      rc = mu_mailbox_translate (msgset->mbox, MU_MAILBOX_MSGNO_TO_UID, n, &n);
+      if (rc)
+	{
+	  mu_diag_funcall (MU_DIAG_ERROR, "mu_mailbox_translate", NULL, rc);
+	  exit (1);
+	}
     }
-  return r->msg_beg;
+  return n;
 }
 
 size_t
-mh_msgset_first_uid (mu_msgset_t msgset)
+mh_msgset_last (mu_msgset_t msgset, int uid)
 {
-  int rc;
-  size_t cur;
-
-  cur = mh_msgset_first (msgset);
-  rc = mu_mailbox_translate (msgset->mbox, MU_MAILBOX_MSGNO_TO_UID, cur, &cur);
+  size_t n;
+  int rc = mu_msgset_last (msgset, &n);
   if (rc)
     {
-      mu_diag_funcall (MU_DIAG_ERROR, "mu_mailbox_translate", NULL, rc);
+      mu_diag_funcall (MU_DIAG_ERROR, "mu_msgset_last", NULL, rc);
       exit (1);
     }
-  return cur;
-}
-
-/* Set the current message to that contained at position 0
-   in the given message set.
-   FIXME: mbox is superfluous
-*/
-void
-mh_msgset_first_current (mu_mailbox_t mbox, mu_msgset_t msgset)
-{
-  mh_mailbox_set_cur (mbox, mh_msgset_first_uid (msgset));
+  if (uid)
+    {
+      rc = mu_mailbox_translate (msgset->mbox, MU_MAILBOX_MSGNO_TO_UID, n, &n);
+      if (rc)
+	{
+	  mu_diag_funcall (MU_DIAG_ERROR, "mu_mailbox_translate", NULL, rc);
+	  exit (1);
+	}
+    }
+  return n;
 }
 
 int
@@ -617,7 +613,7 @@ msgset_parser_run (struct msgset_parser *parser)
 /* Parse a message specification from (argc;argv).  */
 void
 mh_msgset_parse (mu_msgset_t *msgset, mu_mailbox_t mbox, 
-		 int argc, char **argv, char *def)
+		 int argc, char **argv, const char *def)
 {
   struct msgset_parser parser;
   char *xargv[2];
@@ -626,7 +622,7 @@ mh_msgset_parse (mu_msgset_t *msgset, mu_mailbox_t mbox,
     {
       argc = 1;
       argv = xargv;
-      argv[0] = def ? def : "cur";
+      argv[0] = (char*) (def ? def : "cur");
       argv[1] = NULL;
     }
 
@@ -646,7 +642,7 @@ mh_msgset_parse (mu_msgset_t *msgset, mu_mailbox_t mbox,
 
 void
 mh_msgset_parse_string (mu_msgset_t *msgset, mu_mailbox_t mbox, 
-			const char *string, char *def)
+			const char *string, const char *def)
 {
   struct mu_wordsplit ws;
   

@@ -208,7 +208,7 @@ make_draft (mu_mailbox_t mbox, int disp, struct mh_whatnow_env *wh)
       break;  
     }
 
-  msgno = mh_msgset_first (msgset);
+  msgno = mh_msgset_first (msgset, RET_MSGNO);
   rc = mu_mailbox_get_message (mbox, msgno, &msg);
   if (rc)
     {

@@ -54,6 +54,36 @@ insarg (char *arg)
       showargv[1] = p;
     }
 }
+
+static void
+finisarg (void)
+{
+  struct mu_wordsplit ws;
+  char *p;
+  
+  mu_wordsplit (showproc, &ws, MU_WRDSF_DEFFLAGS);
+  if (ws.ws_wordc > 1)
+    {
+      size_t i;
+      
+      if (showargc + ws.ws_wordc > showargmax)
+	{
+	  showargmax = showargc + ws.ws_wordc;
+	  showargv = mu_realloc (showargv, showargmax * sizeof showargv[0]);
+	}
+
+      memmove (showargv + ws.ws_wordc, showargv + 1,
+	       sizeof (showargv[0]) * (showargc - 1));
+      for (i = 1; i < ws.ws_wordc; i++)
+	showargv[i] = ws.ws_wordv[i];
+      showargc += ws.ws_wordc - 1;
+      showproc = ws.ws_wordv[0];
+    }
+
+  p = strrchr (showproc, '/');
+  showargv[0] = (char*) (p ? p + 1 : showproc);
+  addarg (NULL);
+}
 
 static void
 set_draft (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
@@ -181,8 +211,9 @@ int
 main (int argc, char **argv)
 {
   mu_mailbox_t mbox;
-  mu_msgset_t msgset;
+  mu_msgset_t msgset = NULL;
   const char *p;
+  const char *mode = "cur";
   
   showargmax = 2;
   showargc = 1;
@@ -191,6 +222,9 @@ main (int argc, char **argv)
   mh_getopt (&argc, &argv, options, MH_GETOPT_DEFAULT_FOLDER,
 	     args_doc, prog_doc, NULL);
 
+  if (strcmp (mu_program_name, "next") == 0
+      || strcmp (mu_program_name, "prev") == 0)
+    mode = mu_program_name;
   
   mbox = mh_open_folder (mh_current_folder (), MU_STREAM_RDWR);
 
@@ -203,7 +237,7 @@ main (int argc, char **argv)
 	}
     }
   else
-    mh_msgset_parse (&msgset, mbox, argc, argv, "cur");
+    mh_msgset_parse (&msgset, mbox, argc, argv, mode);
 
   /* 1. If !use_showproc set showproc to /bin/cat and go to X.
      2. If -file or -draft is given
@@ -241,7 +275,7 @@ main (int argc, char **argv)
 	      mu_mailbox_close (mbox);
 	      mu_mailbox_destroy (&mbox);
 	      mbox = mh_open_folder (dfolder, MU_STREAM_RDWR);
-	      mh_msgset_parse (&msgset, mbox, 0, NULL, "cur");
+	      mh_msgset_parse (&msgset, mbox, 0, NULL, mode);
 
 	      mu_msgset_foreach_message (msgset, resolve_mime, &ismime);
 	      if (ismime)
@@ -294,9 +328,12 @@ main (int argc, char **argv)
 	mu_msgset_foreach_msguid (msgset, printheader, (void*) path);
     }
 
-  mu_stream_flush (mu_strout);
+  if (!mu_msgset_is_empty (msgset))
+    mh_mailbox_set_cur (mbox, mh_msgset_last (msgset, RET_UID));
   mu_mailbox_close (mbox);
   mu_mailbox_destroy (&mbox);
+
+  mu_stream_flush (mu_strout);
   
   if (!showproc)
     {
@@ -304,10 +341,7 @@ main (int argc, char **argv)
       if (!showproc)
 	showproc = "/usr/bin/more";
     }
-
-  addarg (NULL);
-  p = strrchr (showproc, '/');
-  showargv[0] = (char*) (p ? p + 1 : showproc);
+  finisarg ();
   execvp (showproc, showargv);
   mu_error (_("unable to exec %s: %s"), showargv[0], mu_strerror (errno));
   return 1;