case statement argument expansion

From: Mark Sheppard (msheppard_at_[hidden])
Date: 2003-11-07 08:31:36

Attached is a patch to cause Jam to expand the argument to each "case"
statement. This slight syntax alteration allows you to cache a directory
listing to speed up the case where you're doing multiple consecutive GLOBs
in the same directory, for example:

rule DeleteFiles ( dir : globs + : excludes * )
{
local deletions ;
if $(CACHED_DIR_NAME) != $(dir) {
CACHED_DIR_LIST = [ GLOB $(dir) : * ] ;
CACHED_DIR_NAME = $(dir) ;
}
for local file in $(CACHED_DIR_LIST)
{
switch $(file)
{
case $(dir)/$(globs) :
if ! $(file) in $(excludes) {
Debug "Will delete $(file:D=)" ;
Del $(file) ;
deletions += $(file) ;
}
}
}
return $(deletions) ;
}

Hope someone finds it useful,
Mark.

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