Change files to be transparently compressed

hfs-compress.sh

#!/bin/bash

set -euo pipefail

hfs-compress() {
  local files=("$@")

  local filepath perms temppath
  for filepath in "${files[@]}"; do
    perms=$(stat -f %p "$filepath")
    chmod +rw "$filepath"
    temppath=$(mktemp)
    ditto --hfsCompression "$filepath" "$temppath"
    mv "$temppath" "$filepath"
    chmod "$perms" "$filepath"
  done
}