#!/bin/sed

# This script preprocesses some forth source code which is
# in the os.asm assembly file. Because nasm doesn't seem to have
# any multiline 'db' or 'dw' syntax, I use sed to put "db '" around
# each line of source code.

/code{ *$/,/}code *$/ { 
  # ignore lines starting with "times" in code blocks
  # 't' jumps to end of script.
  s/^ *times/times/;t;
  # ignore lines ending with index labels 
  s/\.so: *$/.so:/;t;

  /^ *$/d;
  /^ *;/d;
  /code{/d;
  /}code/d;
  # need to 'escape' double quotes
  s/"/",'"',"/g;
  s/^ */db " /;
  # put newline on the end of each line
  #s/ *$/ "/
  # what happens if we use unix line endings \n, not \r
  # s/ *$/ ",13,10/
  # move to this soon, unix
  s/ *$/ ",10/
}