cpt-export: use sed to generate manifest

Testing the boost package, using sed results in a significant reduction
for argument generation instead of using the 'read' function. Below are
the 'time' stats for the script.

Previous:
real    0m 58.95s
user    0m 55.80s
sys     0m 3.54s

Current:
real    0m 0.66s
user    0m 0.78s
sys     0m 0.27s

FossilOrigin-Name: 80d891e830579822317d30b66b1b019828fca9343ada23ce17585622288deef3

1 files changed, 3 insertions, 3 deletions

diff --git a/contrib/cpt-export b/contrib/cpt-export
index 5429c08..90bc3e0 100755
--- a/contrib/cpt-export
+++ b/contrib/cpt-export
@@ -21,11 +21,11 @@ tarball="$PWD/$1#$ver-$rel.tar.${CPT_COMPRESS:=gz}"
 set --
 
 # Construct the argument list using each file.
-while read -r file; do
-    [ -d "$CPT_ROOT/$file" ] || set -- "$@" ".$file"
-done < "$CPT_ROOT/var/db/cpt/installed/$pkg/manifest"
+eval set -- "$(sed '/\/$/d;s|^|".|;s|$|"|' \
+    "$CPT_ROOT/var/db/cpt/installed/$pkg/manifest" | tr '\n' ' ')"
 
 # Turn the list of files back into a package.
+cd "$CPT_ROOT/"
  tar cf - -- "$@" | case "$CPT_COMPRESS" in
     bz2) bzip2 -z ;;
     gz)  gzip -6  ;;