Sort out close-on-exit, connection_fatal(), fatalbox(), and

[SessionWindow dealloc] (which was required in order to avoid
segfaulting when a redraw timer fired for a closed session window!).

[originally from svn r5400]

macosx/README.OSX

@@ -18,10 +18,10 @@ say you weren't warned!
 
 Other ways in which the port is currently unfinished include:
 
- - terminal display is horribly slow
+Missing terminal window features
+--------------------------------
 
- - fatal errors are currently output via printf, which is obviously
-   wrong for a GUI application
+ - terminal display is horribly slow
 
  - fonts aren't configurable
 
@@ -38,32 +38,45 @@ Other ways in which the port is currently unfinished include:
    starting position, plus remembering previous window positions per
    the Apple HIG) is not implemented
 
- - close-on-exit isn't implemented
+Missing alert box features
+--------------------------
 
  - warn-on-close isn't implemented
 
- - SessionWindow's dealloc method does nothing yet, so leaks memory
+Missing input features
+----------------------
 
  - use of Alt+numberpad to enter arbitrary numeric character codes
    is not yet supported
 
  - cut and paste isn't supported
 
- - there's no Meta key yet. (I think it will have to be Command
-   rather than Option since the latter is necessary to send some
-   characters, including the rather important # on Apple UK
-   keyboards; but trapping Command-<key> and sending it to the
-   window rather than the application menu requires me to make a
-   positive effort of some sort and I haven't got round to it yet.)
+ - there's no Meta key yet. (I'd like to at least have the
+   possibility of using Command rather than Option as the Meta key,
+   since the latter is necessary to send some characters, including
+   the rather important # on Apple UK keyboards; but trapping
+   Command-<key> and sending it to the window rather than the
+   application menu requires me to make a positive effort of some
+   sort and I haven't got round to it yet. For those Mac users who
+   consider their Command key sacrosanct, don't worry, this option
+   _will_ be configurable and _will_ be off by default.)
 
  - there's no specials menu
 
+Missing terminal emulation features
+-----------------------------------
+
  - currently no support for server-side window management requests
    (i.e. escape sequences to minimise or maximise the window,
    request or change its position and size, change its title etc)
 
  - window title is currently fixed
 
+Other missing features
+----------------------
+
+ - SessionWindow's dealloc method does nothing yet, so leaks memory
+
  - no Event Log
 
  - no mid-session Change Settings

macosx/osxclass.h

@@ -47,6 +47,7 @@ struct alert_queue {
     void *ldisc;
     Backend *back;
     void *backhandle;
+    int exited;
     /*
      * The following two members relate to the currently active
      * alert sheet, if any. They are NULL if there isn't one.
@@ -65,6 +66,8 @@ struct alert_queue {
 - (int)fromBackend:(const char *)data len:(int)len isStderr:(int)is_stderr;
 - (void)startAlert:(NSAlert *)alert
     withCallback:(void (*)(void *, int))callback andCtx:(void *)ctx;
+- (void)endSession:(int)clean;
+- (void)notifyRemoteExit;
 @end
 
 /*

macosx/osxdlg.m

@@ -485,7 +485,27 @@ void old_keyfile_warning(void)
      */
 }
 
-void about_box(void *window)
+static void connection_fatal_callback(void *ctx, int result)
 {
-    /* FIXME */
+    SessionWindow *win = (SessionWindow *)ctx;
+
+    [win endSession:FALSE];
+}
+
+void connection_fatal(void *frontend, char *p, ...)
+{
+    SessionWindow *win = (SessionWindow *)frontend;
+    va_list ap;
+    char *msg;
+    NSAlert *alert;
+
+    va_start(ap, p);
+    msg = dupvprintf(p, ap);
+    va_end(ap);
+
+    alert = [[NSAlert alloc] init];
+    [alert setInformativeText:[NSString stringWithCString:msg]];
+    [alert addButtonWithTitle:@"Proceed"];
+    [win startAlert:alert withCallback:connection_fatal_callback
+     andCtx:win];
 }

macosx/osxmain.m

@@ -60,28 +60,47 @@ char *x_get_default(const char *key)
     return NULL;		       /* this is a stub */
 }
 
-void modalfatalbox(char *p, ...)
+static void commonfatalbox(char *p, va_list ap)
 {
-    /* FIXME: proper OS X GUI stuff */
-    va_list ap;
-    fprintf(stderr, "FATAL ERROR: ");
-    va_start(ap, p);
-    vfprintf(stderr, p, ap);
-    va_end(ap);
-    fputc('\n', stderr);
+    char errorbuf[2048];
+    NSAlert *alert;
+
+    /*
+     * We may have come here because we ran out of memory, in which
+     * case it's entirely likely that that further memory
+     * allocations will fail. So (a) we use vsnprintf to format the
+     * error message rather than the usual dupvprintf; and (b) we
+     * have a fallback way to get the message out via stderr if
+     * even creating an NSAlert fails.
+     */
+    vsnprintf(errorbuf, lenof(errorbuf), p, ap);
+
+    alert = [NSAlert alloc];
+    if (!alert) {
+	fprintf(stderr, "fatal error (and NSAlert failed): %s\n", errorbuf);
+    } else {
+	alert = [[alert init] autorelease];
+	[alert addButtonWithTitle:@"Terminate"];
+	[alert setInformativeText:[NSString stringWithCString:errorbuf]];
+	[alert runModal];
+    }
     exit(1);
 }
 
 void fatalbox(char *p, ...)
 {
-    /* FIXME: proper OS X GUI stuff */
     va_list ap;
-    fprintf(stderr, "FATAL ERROR: ");
     va_start(ap, p);
-    vfprintf(stderr, p, ap);
+    commonfatalbox(p, ap);
+    va_end(ap);
+}
+
+void modalfatalbox(char *p, ...)
+{
+    va_list ap;
+    va_start(ap, p);
+    commonfatalbox(p, ap);
     va_end(ap);
-    fputc('\n', stderr);
-    exit(1);
 }
 
 void cmdline_error(char *p, ...)

macosx/osxwin.m

@@ -300,6 +300,8 @@
      */
     [self center];		       /* :-) */
 
+    exited = FALSE;
+
     return self;
 }
 
@@ -311,6 +313,14 @@
      * Do so.
      */
     sfree(alert_ctx);
+    if (term)
+	term_free(term);
+    if (logctx)
+	log_free(logctx);
+    if (back)
+	back->free(backhandle);
+    if (ldisc)
+	ldisc_free(ldisc);
     [super dealloc];
 }
 
@@ -346,7 +356,7 @@
     char coutput[32];
     int use_coutput = FALSE, special = FALSE, start, end;
 
-printf("n=%d c=U+%04x cm=U+%04x m=%08x\n", n, c, cm, m);
+//printf("n=%d c=U+%04x cm=U+%04x m=%08x\n", n, c, cm, m);
 
     /*
      * FIXME: Alt+numberpad codes.
@@ -846,6 +856,33 @@ printf("n=%d c=U+%04x cm=U+%04x m=%08x\n", n, c, cm, m);
     }
 }
 
+- (void)notifyRemoteExit
+{
+    int exitcode;
+
+    if (!exited && (exitcode = back->exitcode(backhandle)) >= 0)
+	[self endSession:(exitcode == 0)];
+}
+
+- (void)endSession:(int)clean
+{
+    exited = TRUE;
+    if (ldisc) {
+	ldisc_free(ldisc);
+	ldisc = NULL;
+    }
+    if (back) {
+	back->free(backhandle);
+	backhandle = NULL;
+	back = NULL;
+	//FIXME: update specials menu;
+    }
+    if (cfg.close_on_exit == FORCE_ON ||
+	(cfg.close_on_exit == AUTO && clean))
+	[self close];
+    // FIXME: else show restart menu item
+}
+
 @end
 
 int from_backend(void *frontend, int is_stderr, const char *data, int len)
@@ -859,23 +896,11 @@ void frontend_keypress(void *handle)
     /* FIXME */
 }
 
-void connection_fatal(void *frontend, char *p, ...)
-{
-    //SessionWindow *win = (SessionWindow *)frontend;
-    /* FIXME: proper OS X GUI stuff */
-    va_list ap;
-    fprintf(stderr, "FATAL ERROR: ");
-    va_start(ap, p);
-    vfprintf(stderr, p, ap);
-    va_end(ap);
-    fputc('\n', stderr);
-    exit(1);
-}
-
 void notify_remote_exit(void *frontend)
 {
-    //SessionWindow *win = (SessionWindow *)frontend;
-    /* FIXME */
+    SessionWindow *win = (SessionWindow *)frontend;
+
+    [win notifyRemoteExit];
 }
 
 void ldisc_update(void *frontend, int echo, int edit)