compile

#!/bin/sh

usage() {
  cat <<EOF
usage: $basename [sed script file]

Translate a sed script to C and compile the result to produce a standalone
binary reproducing the script behavior.

If no file is provided the sed code to be translated will be read from stdin.
EOF

  exit "${1-0}"
}

readonly basename="${0##*/}"

for arg do
  case "$arg" in
    --help|-h)
        usage
        ;;
      *)
        if ! [ -e "$arg" ]; then
          printf '%s: %s: No such file or directory\n' "$basename" "$arg"
          usage 1
        fi >&2
        ;;
  esac
done

readonly translator=./par.sed
readonly generated_file=generated.c
readonly bin="${BIN-./sed-bin}"

set -x

cat "$@" | "$translator" > "$generated_file"
make

{ set +x; } 2> /dev/null

echo Compiled sed script available: "$bin"