Re: Difficulties with _oldlist

[Peter Stephenson <pws@csr.com>]

Bart Schaefer wrote:
> A better solution would be 
> if $WIDGET could be replaced by a different variable, say $WIDGETSTYLE for 
> example, which is set corresponding to the second argument of "zle -C".
> I.e. if the widget were defined with
> 
> 	zle -C blather list-choices blather
> 
> then at time of call $WIDGETSTYLE would be "list-choices", and _oldlist
> could examine that instead of $WIDGET.

This is the internal implementation.  For a "zle -N" widget $WIDGETSTYLE
gives the name of the function that implements the widget.  Altering the
completion system is left as an exercise to the reader.

Index: Src/Zle/zle_params.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/zle_params.c,v
retrieving revision 1.16
diff -u -r1.16 zle_params.c
--- Src/Zle/zle_params.c	29 Jul 2004 14:22:22 -0000	1.16
+++ Src/Zle/zle_params.c	8 Sep 2004 16:52:53 -0000
@@ -55,43 +55,45 @@
 } zleparams[] = {
     { "BUFFER",  PM_SCALAR,  FN(set_buffer),  FN(get_buffer),
 	zleunsetfn, NULL },
-    { "CURSOR",  PM_INTEGER, FN(set_cursor),  FN(get_cursor),
-	zleunsetfn, NULL },
-    { "MARK",  PM_INTEGER, FN(set_mark),  FN(get_mark),
-	zleunsetfn, NULL },
-    { "LBUFFER", PM_SCALAR,  FN(set_lbuffer), FN(get_lbuffer),
-	zleunsetfn, NULL },
-    { "RBUFFER", PM_SCALAR,  FN(set_rbuffer), FN(get_rbuffer),
+    { "BUFFERLINES", PM_INTEGER | PM_READONLY, NULL, FN(get_bufferlines),
+        zleunsetfn, NULL },
+    { "CONTEXT", PM_SCALAR | PM_READONLY, NULL, FN(get_context),
 	zleunsetfn, NULL },
-    { "PREBUFFER",  PM_SCALAR | PM_READONLY,  NULL,  FN(get_prebuffer),
+    { "CURSOR",  PM_INTEGER, FN(set_cursor),  FN(get_cursor),
 	zleunsetfn, NULL },
-    { "WIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_widget),
-        zleunsetfn, NULL },
-    { "LASTWIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_lwidget),
+    { "CUTBUFFER", PM_SCALAR, FN(set_cutbuffer), FN(get_cutbuffer),
+	unset_cutbuffer, NULL },
+    { "HISTNO", PM_INTEGER, FN(set_histno), FN(get_histno),
         zleunsetfn, NULL },
     { "KEYMAP", PM_SCALAR | PM_READONLY, NULL, FN(get_keymap),
         zleunsetfn, NULL },
     { "KEYS", PM_SCALAR | PM_READONLY, NULL, FN(get_keys),
         zleunsetfn, NULL },
-    { "NUMERIC", PM_INTEGER | PM_UNSET, FN(set_numeric), FN(get_numeric),
-        unset_numeric, NULL },
-    { "HISTNO", PM_INTEGER, FN(set_histno), FN(get_histno),
+    { "killring", PM_ARRAY, FN(set_killring), FN(get_killring),
+	unset_killring, NULL },
+    { "LASTSEARCH", PM_SCALAR | PM_READONLY, NULL, FN(get_lsearch),
         zleunsetfn, NULL },
-    { "BUFFERLINES", PM_INTEGER | PM_READONLY, NULL, FN(get_bufferlines),
+    { "LASTWIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_lwidget),
         zleunsetfn, NULL },
+    { "LBUFFER", PM_SCALAR,  FN(set_lbuffer), FN(get_lbuffer),
+	zleunsetfn, NULL },
+    { "MARK",  PM_INTEGER, FN(set_mark),  FN(get_mark),
+	zleunsetfn, NULL },
+    { "NUMERIC", PM_INTEGER | PM_UNSET, FN(set_numeric), FN(get_numeric),
+        unset_numeric, NULL },
     { "PENDING", PM_INTEGER | PM_READONLY, NULL, FN(get_pending),
         zleunsetfn, NULL },
-    { "CUTBUFFER", PM_SCALAR, FN(set_cutbuffer), FN(get_cutbuffer),
-	unset_cutbuffer, NULL },
-    { "killring", PM_ARRAY, FN(set_killring), FN(get_killring),
-	unset_killring, NULL },
+    { "POSTDISPLAY", PM_SCALAR, FN(set_postdisplay), FN(get_postdisplay),
+	zleunsetfn, NULL },
+    { "PREBUFFER",  PM_SCALAR | PM_READONLY,  NULL,  FN(get_prebuffer),
+	zleunsetfn, NULL },
     { "PREDISPLAY", PM_SCALAR, FN(set_predisplay), FN(get_predisplay),
 	zleunsetfn, NULL },
-    { "POSTDISPLAY", PM_SCALAR, FN(set_postdisplay), FN(get_postdisplay),
+    { "RBUFFER", PM_SCALAR,  FN(set_rbuffer), FN(get_rbuffer),
 	zleunsetfn, NULL },
-    { "LASTSEARCH", PM_SCALAR | PM_READONLY, NULL, FN(get_lsearch),
+    { "WIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_widget),
         zleunsetfn, NULL },
-    { "CONTEXT", PM_SCALAR | PM_READONLY, NULL, FN(get_context),
+    { "WIDGETSTYLE", PM_SCALAR | PM_READONLY, NULL, FN(get_widgetstyle),
 	zleunsetfn, NULL },
     { NULL, 0, NULL, NULL, NULL, NULL }
 };
@@ -280,6 +282,21 @@
 
 /**/
 static char *
+get_widgetstyle(UNUSED(Param pm))
+{
+    Widget widget = bindk->widget;
+    int flags = widget->flags;
+
+    if (flags & WIDGET_INT)
+	return ".internal";	/* Don't see how this can ever be returned... */
+    else if (flags & WIDGET_NCOMP)
+	return widget->u.comp.wid;
+    else
+	return widget->u.fnnam;
+}
+
+/**/
+static char *
 get_lwidget(UNUSED(Param pm))
 {
     return (lbindk ? lbindk->nam : "");
Index: Doc/Zsh/zle.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/zle.yo,v
retrieving revision 1.41
diff -u -r1.41 zle.yo
--- Doc/Zsh/zle.yo	8 Sep 2004 15:24:08 -0000	1.41
+++ Doc/Zsh/zle.yo	8 Sep 2004 16:52:55 -0000
@@ -732,6 +732,16 @@
 item(tt(WIDGET) (scalar))(
 The name of the widget currently being executed; read-only.
 )
+vindex(WIDGETSTYLE)
+item(tt(WIDGET) (scalar))(
+Describes the implementation behind the widget currently being executed;
+the second argument that followed tt(zle -C) or tt(zle -N) when the widget
+was defined, if any.  If the widget was defined with tt(zle -N) and there was
+no second argument this is the same as the first argument.  Hence for
+tt(zle -N) this gives the name of the function that implements the widget,
+and for tt(zle -C) this gives the internal completion widget that defines
+the type of completion.  Read-only.
+)
 enditem()
 
 subsect(Special Widget)

-- 
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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