28026: use "zsh_directory_name c" for completion of dynamic directory names

ChangeLog

@@ -1,5 +1,9 @@
 2010-06-11  Peter Stephenson  <p.w.stephenson@ntlworld.com>
 
+	* 28026: Completion/Zsh/Context/_dynamic_directory_name,
+	Doc/Zsh/expn.yo: use "zsh_directory_name c" for completion
+	of dynamic directory names.
+
 	* 28025: Doc/Zsh/expn.yo, Src/subst.c, Src/utils.c: (D)
 	parameter flag to abbreviate directories.
 
@@ -13272,5 +13276,5 @@
 
 *****************************************************
 * This is used by the shell to define $ZSH_PATCHLEVEL
-* $Revision: 1.4998 $
+* $Revision: 1.4999 $
 *****************************************************

Completion/Zsh/Context/_dynamic_directory_name

@@ -1,7 +1,7 @@
 #autoload
 
-# The core libraries don't check for dynamic directory name expansion;
-# this gets called from _subscript.  This is a placeholder for
-# people to overload.
-
-_message 'dynamic directory name: redefine _dynamic_directory_name to use'
+if [[ -n $functions[zsh_directory_name] ]]; then
+  zsh_directory_name c
+else
+  _message 'dynamic directory name: implemented as zsh_directory_name c'
+fi

Doc/Zsh/expn.yo

@@ -1451,6 +1451,12 @@ parts of the directory path, as described below; it is used if the prefix
 length matched (16 in the example) is longer than that matched by any
 static name.
 
+The completion system calls `tt(zsh_directory_name c)' in order to
+completion dynamic names for directories.  The code for this should be
+as for any other completion function as described in
+ifnzman(noderef(Completion System))\
+ifzman(zmanref(zshcompsys)).
+
 As a working example, here is a function that expands any dynamic names
 beginning with the string tt(p:) to directories below
 tt(/home/pws/perforce).  In this simple case a static name for the
@@ -1461,16 +1467,28 @@ example(zsh_directory_name+LPAR()RPAR() {
   setopt extendedglob
   local -a match mbegin mend
   if [[ $1 = d ]]; then
+    # turn the directory into a name
     if [[ $2 = (#b)(/home/pws/perforce/)([^/]##)* ]]; then
       typeset -ga reply
       reply=(p:$match[2] $(( ${#match[1]} + ${#match[2]} )) )
     else
       return 1
     fi
-  else
+  elif [[ $1 = n ]]; then
+    # turn the name into a directory
     [[ $2 != (#b)p:(?*) ]] && return 1
     typeset -ga reply
     reply=(/home/pws/perforce/$match[1])
+  elif [[ $1 = c ]]; then
+    # complete names
+    local expl
+    local -a dirs
+    dirs=(/home/pws/perforce/*(/:t))
+    dirs=(p:${^dirs})
+    _wanted dynamic-dirs expl 'dynamic directory' compadd -S\] -a dirs
+    return
+  else
+    return 1
   fi
   return 0
 })