add preserve-prefix style to keep pathname prefix unchanged (15400)

ChangeLog

@@ -1,3 +1,9 @@
+2001-07-17  Sven Wischnowsky  <wischnow@zsh.org>
+
+	* 15400: Completion/Unix/Type/_path_files,
+	Completion/Zsh/Command/_zstyle, Doc/Zsh/compsys.yo: add
+	preserve-prefix style to keep pathname prefix unchanged
+
 2001-07-13  Andrej Borsenkow  <bor@zsh.org>
 
 	* 15278 (Sven), 15390: Completion/Unix/Command/_mount,

Completion/Zsh/Command/_zstyle

@@ -75,6 +75,7 @@ styles=(
   ports			 c:_ports
   prefix-hidden		 c:bool
   prefix-needed		 c:bool
+  preserve-prefix        c:preserve-prefix
   range                  c:
   regular                c:bool
   remote-access		 c:bool
@@ -304,6 +305,10 @@ while [[ -n $state ]]; do
       _wanted values expl 'insert unambiguous string' compadd true false pattern
       ;;
 
+    preserve-prefix)
+      _message 'pattern matching prefix to keep'
+      ;;
+
     urgh) 
       _wanted values expl no compadd no false off 0
       ;;

Doc/Zsh/compsys.yo

@@ -1834,6 +1834,16 @@ all.
 
 The default style for this style is `true'.
 )
+kindex(preserve-prefix, completion style)
+item(tt(preserve-prefix))(
+This style is used when completing path names.  Its value should be a
+pattern matching an initial prefix of the word to complete that should
+be left unchanged under all circumstances.  For example, on some Unices
+an initial `tt(//)' (double slash) has a special meaning and hence
+should be kept.  For that one could set this style to the string
+`tt(//)'.  As another example, setting this style to `tt(?:/)' under
+Cygwin would allow completion after `tt(a:/...)' and the like.
+)
 kindex(range, completion style)
 item(tt(range))(
 This is used by the tt(_history) completer and the