missingflex

#! /bin/sh



if test "$#" -lt "1"; then
  echo ""
  echo "Error: $0 can only be called with at least one command line argument"
  echo ""
  echo "Usage: $0 [OPTIONS] FILE"
  echo ""
  echo "Where FILE is a flex source file"
  echo ""
  echo "all options except -o are ignored. Use -oOUTFILE to specify the output"
  echo "file"
  echo ""
  exit 1
fi

OUTPUT=""

for PARM in $*; do
  CHECK_FOR_OUTPUT_PARM=`echo "$PARM" | sed s/[^-o].*$//`;
  if test "$CHECK_FOR_OUTPUT_PARM" = "-o"; then
    OUTPUT=`echo "$PARM" | sed s/^-o//`
  fi
  LAST=$PARM
done

if ! test -e $LAST; then
  echo ""
  echo "ERROR: Could not find $1"
  echo ""
  exit 1
fi


EXT=`echo "$LAST" | sed s/^[^.]*//`
BASE=`echo "$LAST" | sed s/$EXT//`

if test "$EXT" != ".l" -a "$EXT" != ".ll"; then
  echo ""
  echo "ERROR: $LAST should end in \`.l' or \`.ll'"
  echo ""
  exit 1
fi

if test "$EXT" = ".l"; then
  NEW_EXT=".c"
else  
  NEW_EXT=".cc"
fi

if test "$OUTPUT" = ""; then
  OUTPUT="$BASE$NEW_EXT"
fi

POSSIBLE="$BASE$NEW_EXT"



if test -e "$OUTPUT"; then
  touch "$OUTPUT"
  echo ""
  echo "WARNING: \`flex' is missing on your system.  You should only need it if"
  echo "         you modified a \`.l' or \`.ll' file.  You may need the \`Flex'"
  echo "         package in order for those modifications to take effect.  You "
  echo "         can get \`Flex' from any GNU archive site."
  echo ""
elif test -e "$POSSIBLE"; then
  cp "$POSSIBLE" "$OUTPUT"
  echo ""
  echo "WARNING: \`flex' is missing on your system.  You should only need it if"
  echo "         you modified a \`.l' or \`.ll' file.  You may need the \`Flex'"
  echo "         package in order for those modifications to take effect.  You "
  echo "         can get \`Flex' from any GNU archive site."
  echo ""
else
  echo ""
  echo "ERROR:   \`flex' is missing on your system and the flex generated"
  echo "         source could not be found. You can get \`Flex' from any "
  echo "         GNU archive site."
  echo ""
fi