my

#!/bin/sh

# Attempt to mangle a Makefile in hopes that it might be useful, but
# without any warranty whatsoever.  Shudder.

if [ "$*" = "mistake" ]; then
  if [ -f Makefile.unmangled ]; then
    echo "That's all right.  Here's your old Makefile back."
    mv Makefile.unmangled Makefile
    exit 0
  else
    echo "I don't know what you're talking about."
    exit 1
  fi
fi

if [ "$*" = "make right or wrong" ]; then
  if [ -e Makefile.unmangled ]; then
    echo "I already mangled the Makefile.  Sorry, I'm a very stupid script."
    exit 1
  else
    echo "I'll mangle this Makefile..."
    mv Makefile Makefile.unmangled
    if ! perl my.pl < Makefile.unmangled >Makefile; then
      echo "It like didn't work or something.  Here's your old Makefile back."
      mv Makefile.unmangled Makefile
      exit 1
    else
      echo "Ha ha, there."
      exit 0
    fi
  fi
fi

echo "No, no, you didn't say it properly."
exit 1