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Re: how to customize _all_matches use?

On Sat, 16 Jun 2007 21:05:42 +0200
Vadim Zeitlin <vz-zsh@xxxxxxxxxxxx> wrote:
> I wonder if _complete_help can somehow be used to show the
> context for another completer?

Here's an implementation of _complete_help or _complete_debug for the
_generic completer.  After you've created a (non-completion) widget you
just need to type the key sequence for that, then the key sequence for the
generic widget, so it's a lot more useful than my first attempt.  Even so,
it takes more lines to describe than to implement.

Index: Doc/Zsh/compsys.yo
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/compsys.yo,v
retrieving revision 1.201
diff -u -r1.201 compsys.yo
--- Doc/Zsh/compsys.yo	16 Jun 2007 17:53:56 -0000	1.201
+++ Doc/Zsh/compsys.yo	18 Jun 2007 18:18:54 -0000
@@ -3179,6 +3179,42 @@
 information available from the completion functions called, which in turn
 is determined by the user's own styles and other settings.
+Unlike other commands listed here, this must be created as a normal ZLE
+widget rather than a completion widget (i.e. with tt(zle -N)).  It
+is used for generating help with a widget bound to the tt(_generic)
+widget that is described above.
+If this widget is created using the name of the function, as it is by
+default, then when executed it will read a key sequence.  This is expected
+to be bound to a call to a completion function that uses the tt(_generic)
+widget.  That widget will be executed, and information provided in
+the same format that the tt(_complete_help) widget displays for
+contextual completion.
+If the widget's name contains tt(debug), for example if it is created
+as `tt(zle -N _complete_debug_generic _complete_help_generic)', it
+will read and execute the keystring for a generic widget as before,
+but then generate debugging information as done by tt(_complete_debug)
+for contextual completion.
+If the widget's name contains tt(noread), it will not read a keystring
+but instead arrange that the next use of a generic widget run in
+the same shell will have the effect as described above.
+The widget works by setting the shell parameter
+tt(ZSH_TRACE_GENERIC_WIDGET) which is read by tt(_generic).  Unsetting
+the parameter cancels any pending effect of the tt(noread) form.
+For example, after executing the following:
+example(zle -N _complete_debug_generic _complete_help_generic
+bindkey '^x:' _complete_debug_generic)
+typing `tt(C-x :)' followed by the key sequence for a generic widget
+will cause trace output for that widget to be saved to a file.
 findex(_complete_tag (^Xt))
 item(tt(_complete_tag (^Xt)))(
 This widget completes symbol tags created by the tt(etags) or tt(ctags)
Index: Completion/Base/Utility/_complete_help_generic
RCS file: Completion/Base/Utility/_complete_help_generic
diff -N Completion/Base/Utility/_complete_help_generic
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ Completion/Base/Utility/_complete_help_generic	18 Jun 2007 18:18:54 -0000
@@ -0,0 +1,17 @@
+# Note this is a normal ZLE widget, not a completion widget.
+# A completion widget can't call another widget, while a normal
+# widget can.
+[[ $WIDGET = *noread* ]] || local ZSH_TRACE_GENERIC_WIDGET
+if [[ $WIDGET = *debug* ]]; then
+  ZSH_TRACE_GENERIC_WIDGET=_complete_debug
+  ZSH_TRACE_GENERIC_WIDGET=_complete_help
+if [[ $WIDGET != *noread* ]]; then
+  zle read-command && zle $REPLY -w
Index: Completion/Base/Widget/_complete_debug
RCS file: /cvsroot/zsh/zsh/Completion/Base/Widget/_complete_debug,v
retrieving revision 1.5
diff -u -r1.5 _complete_debug
--- Completion/Base/Widget/_complete_debug	22 May 2005 15:46:36 -0000	1.5
+++ Completion/Base/Widget/_complete_debug	18 Jun 2007 18:18:54 -0000
@@ -11,7 +11,7 @@
 setopt xtrace
 integer ret=$?
 unsetopt xtrace
Index: Completion/Base/Widget/_complete_help
RCS file: /cvsroot/zsh/zsh/Completion/Base/Widget/_complete_help,v
retrieving revision 1.5
diff -u -r1.5 _complete_help
--- Completion/Base/Widget/_complete_help	8 Jul 2002 08:59:40 -0000	1.5
+++ Completion/Base/Widget/_complete_help	18 Jun 2007 18:18:54 -0000
@@ -37,7 +37,7 @@
   trap 'unfunction compadd zstyle' EXIT INT
-  _main_complete
+  ${1:-_main_complete}
   unfunction compadd zstyle
   trap - EXIT INT
Index: Completion/Base/Widget/_generic
RCS file: /cvsroot/zsh/zsh/Completion/Base/Widget/_generic,v
retrieving revision 1.3
diff -u -r1.3 _generic
--- Completion/Base/Widget/_generic	24 Apr 2005 18:38:01 -0000	1.3
+++ Completion/Base/Widget/_generic	18 Jun 2007 18:18:54 -0000
@@ -1,5 +1,12 @@
+if [[ -n $ZSH_TRACE_GENERIC_WIDGET ]]; then
+  $widget _generic
+  return
 local curcontext="${curcontext:-}"
 if [[ -z "$curcontext" ]]; then

Peter Stephenson <pws@xxxxxxx>                  Software Engineer
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Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070

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