Re: zsh exits after delete-char-or-list and two ^Cs

[Peter Stephenson <pws@csr.com>]

Bart Schaefer wrote:
> The effect of this is going to be that "zle -I" has no effect when called
> from completion widgets, where previously it could.  Is that really the
> intent?
>
> I'd think you wanted something more like:
> 
>   if (zleactive) {
>       if (!trashedzle)
>           trashzle();
>       return zle_usable()? 0 : 1;
>   }
> 
> (Though perhaps not precisely that either.)

Well, that would do, if suitably documented.

It looks like it would be more sensible to have the test for whether a
zle widget is callable separate from the return status for zle -I.
However, it's a bit late now.

Index: Doc/Zsh/zle.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/zle.yo,v
retrieving revision 1.39
diff -u -r1.39 zle.yo
--- Doc/Zsh/zle.yo	29 Jul 2004 14:22:21 -0000	1.39
+++ Doc/Zsh/zle.yo	2 Sep 2004 09:15:35 -0000
@@ -505,9 +505,12 @@
 Note that there are normally better ways of manipulating the display from
 within zle widgets; see, for example, `tt(zle -R)' above.
 
-The status is zero if zle is active and the current zle display has
-been invalidated (even if this was by a previous call to `tt(zle -I)'),
-else one.
+The returned status is zero if a zle widget can be called immediately.
+Note this is independent of whether the display has been invalidated.
+For example, if a completion widget is active a zle widget cannot be used
+and the status is one even if the display was invalidated; on the other
+hand, the status may be zero if the display was invalidated by a previous
+call to `tt(zle -I)'.
 )
 item(var(widget) tt([ -n) var(num) tt(]) tt([ -N ]) var(args) ...)(
 Invoke the specified widget.  This can only be done when ZLE is
Index: Src/Zle/zle_thingy.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/zle_thingy.c,v
retrieving revision 1.13
diff -u -r1.13 zle_thingy.c
--- Src/Zle/zle_thingy.c	2 Jun 2004 22:15:02 -0000	1.13
+++ Src/Zle/zle_thingy.c	2 Sep 2004 09:15:36 -0000
@@ -619,6 +619,23 @@
 
 /**/
 static int
+zle_usable()
+{
+    return zleactive && !incompctlfunc && !incompfunc
+#if 0
+	/*
+	 * PWS experiment: commenting this out allows zle widgets
+	 * in signals, hooks etc.  I'm not sure if this has a down side;
+	 * it ought to be that zleactive is good enough to test whether
+	 * widgets are callable.
+	 */
+	&& sfcontext == SFC_WIDGET
+#endif
+	   ;
+}
+
+/**/
+static int
 bin_zle_call(char *name, char **args, UNUSED(Options ops), UNUSED(char func))
 {
     Thingy t;
@@ -629,10 +646,9 @@
     if (!wname) {
 	if (saveflag)
 	    zmod = modsave;
-	return (!zleactive || incompctlfunc || incompfunc ||
-		sfcontext != SFC_WIDGET);
+	return !zle_usable();
     }
-    if(!zleactive || incompctlfunc || incompfunc || sfcontext != SFC_WIDGET) {
+    if(!zle_usable()) {
 	zwarnnam(name, "widgets can only be called when ZLE is active",
 	    NULL, 0);
 	return 1;
@@ -685,10 +701,15 @@
 static int
 bin_zle_invalidate(UNUSED(char *name), UNUSED(char **args), UNUSED(Options ops), UNUSED(char func))
 {
+    /*
+     * Trash zle if trashable, but only indicate that zle is usable
+     * if it's possible to call a zle widget next.  This is not
+     * true if a completion widget is active.
+     */
     if (zleactive) {
 	if (!trashedzle)
 	    trashzle();
-	return 0;
+	return !zle_usable();
     } else
 	return 1;
 }

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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