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PATCH: add preserve-prefix to compinstall

This adds preserve-prefix handling to compinstall's file section,
because I only just discovered it stopped me needing fake-files under

Index: Completion/compinstall
RCS file: /cvsroot/zsh/zsh/Completion/compinstall,v
retrieving revision 1.6
diff -u -r1.6 compinstall
--- Completion/compinstall	9 Oct 2001 11:17:05 -0000	1.6
+++ Completion/compinstall	7 Mar 2003 15:06:34 -0000
@@ -1529,7 +1529,7 @@
 #       squeeze-slashes,
 __ci_do_file_styles() {
   local key files cursor expand speciald ignorep squeezes select
-  local prefon suffon lssuffixes
+  local prefon suffon lssuffixes preserve
   __ci_get_this_style file-sort files
   __ci_get_this_style ignore-parents ignorep
@@ -1537,6 +1537,8 @@
   __ci_get_this_style squeeze-slashes squeezes
   __ci_get_this_style expand expand
   __ci_get_this_style list-suffixes lssuffixes
+  __ci_get_this_style preserve-prefix preserve
+  [[ -n $preserve ]] && preserve=${(Q)preserve}
   while true; do
@@ -1554,6 +1556,8 @@
 5.  Configure how multiple paths are expanded and displayed, 
     e.g. /f/b -> /foo/bar
+6.  Keep certain prefixes unchanged, such as \`//resource/'.
 q.  Return without saving.
 0.  Done setting options for filename completion.
@@ -1729,6 +1733,21 @@
 	    ([nN]) lssuffixes=;;
+      (6) print "\
+On some systems, there are special forms for the start of a filename
+which should be left alone by the completion system.  For example, Cygwin
+uses a double slash to indicate a network resource, hence a prefix of
+the form \`//resource/' should be left alone.  This style gives a pattern
+to match any such prefixes; alternatives separated by \`|' are therefore
+possible.  Edit the pattern as you like.  If this is empty, the shell will not
+handle any prefixes specially."
+          if [[ -z $preserve ]]; then
+	      preserve="//[^/]##/"
+	      print "
+Accept the default to handle network resources as just described."
+	  fi
+	  vared -eh -p "pattern> " preserve
+	  ;;
       (q) return 1
@@ -1741,6 +1760,9 @@
   __ci_set_this_style squeeze-slashes squeezes
   __ci_set_this_style expand expand
   __ci_set_this_style list-suffixes lssuffixes
+  # pattern, always quote
+  [[ -n $preserve ]] && preserve=${(qq)preserve}
+  __ci_set_this_style preserve-prefix preserve
   return 0

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

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