From 2018dc20a5e817afd37065c4cc23968bceed59a7 Mon Sep 17 00:00:00 2001
From: Tanaka Akira <akr@users.sourceforge.net>
Date: Tue, 27 Apr 1999 17:36:17 +0000
Subject: zsh-workers:6118

---
 Completion/Core/_oldlist | 29 +++++++++++++++++++++++++++++
 Doc/Zsh/compsys.yo       | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 Completion/Core/_oldlist

diff --git a/Completion/Core/_oldlist b/Completion/Core/_oldlist
new file mode 100644
index 000000000..9e791b3a5
--- /dev/null
+++ b/Completion/Core/_oldlist
@@ -0,0 +1,29 @@
+#autoload
+
+# If this is a listing widget and there is already an old list,
+# and either the compconfig key oldlist_list is `always', or it is not `never'
+# and the list is not already shown, then use the existing list for listing
+# (even if it was generated by another widget).
+if [[ -n $compstate[old_list] && $compconfig[oldlist_list] != never &&
+  $WIDGET = *list* &&
+  ( $compconfig[oldlist_list] = always || $compstate[old_list] != shown ) ]]
+then
+  compstate[old_list]=keep
+  return 0
+fi
+
+# If this is a completion widget, and we have a completion inserted already,
+# and the compconfig key oldlist_menu is not never, then we cycle through the
+# existing list (even if it was generated by another widget).
+if [[ -n $compstate[old_insert] && $WIDGET = *complete(|-prefix) &&
+  $compconfig[oldlist_menu] != never ]]; then
+  compstate[old_list]=keep
+  if [[ $WIDGET = *reverse* ]]; then
+    compstate[insert]=$(( compstate[old_insert] - 1 ))
+  else
+    compstate[insert]=$(( compstate[old_insert] + 1 ))
+  fi
+  return 0
+fi
+
+return 1
diff --git a/Doc/Zsh/compsys.yo b/Doc/Zsh/compsys.yo
index 159f944c3..cedc4ec8c 100644
--- a/Doc/Zsh/compsys.yo
+++ b/Doc/Zsh/compsys.yo
@@ -528,6 +528,53 @@ tt(MENU_COMPLETE) option and does not work with the other
 menucompletion widgets such as tt(reverse-menu-complete), or
 tt(accept-and-menu-complete).
 )
+item(tt(_oldlist))(
+This completer controls how the standard completion widgets behave when
+there is an existing list of completions which may have been generated by a
+special completion (i.e. a separately-bound completion command).  It should
+appear in the list of completers before any of the widgets which generate
+matches.  It understands two configuration keys:
+
+startitem()
+item(tt(oldlist_list))(
+If this is set to tt(always), then standard widgets which perform listing
+will retain the current list of matches, however they were generated.  If
+it is set to tt(never), this will not be done (the behaviour without the
+tt(_oldlist) completer).  If it is unset, or any other value, then the
+existing list of completions will be displayed if it is not already;
+otherwise, the standard completion list will be generated:  this is the
+default behaviour of tt(_oldlist).
+
+For example, suppose you type tt(^Xc) to use the tt(_correct_word)
+widget, which generates a list of corrections for the word under the
+cursor.  Usually, typing tt(^D) would generate a standard list of
+completions for the word on the command line, and show that.  With
+tt(_oldlist), it will instead show the list of corrections already
+generated.
+)
+item(tt(oldlist_menu))(
+Controls how menu completion behaves when a completion has already been
+inserted and the user types a standard completion key type as tt(TAB).
+The default behaviour of tt(_oldlist) is that menu completion always
+continues with the existing list of completions.  If this key is set to
+tt(never), however, a new completion is started if the old list was
+generated by a different completion command (the behaviour without the
+tt(_oldlist) completer).
+For example, suppose you type tt(^Xc) to generate a list of corrections,
+and menu completion is started in one of the usual ways.  Usually, typing
+tt(TAB) at this point would start trying to complete the line as it now
+appears.  With tt(_oldlist), it will instead continue to cycle through the
+list of completions. 
+)
+enditem()
+)
+item(tt(_closequotes))(
+When a completion starts in quotes, this completer will recognise the fact
+and insert a matching closing quote if there is not already one later on
+the line.  It should come earlier in the list of completers than any of the
+completers which generate matches.  It can be confused by some of the more
+sophisticated forms of completion.
+)
 enditem()
 
 texinode(Completion Functions)()(Control Functions)(Completion System)
-- 
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