#!/bin/sh -e

# Originally written by akkartik. Modified by tekknolagi.

test "$CC" || export CC=cc
export CFLAGS="$CFLAGS -O0 -g -Wall -Wextra -pedantic -fno-strict-aliasing"

# return 1 if $1 is older than _any_ of the remaining args
older_than() {
  local target=$1
  shift
  if [ ! -e $target ]
  then
    echo "updating $target" >&2
    return 0  # success
  fi
  local f
  for f in $*
  do
    if [ $f -nt $target ]
    then
      echo "updating $target" >&2
      return 0  # success
    fi
  done
  return 1  # failure
}

update_if_necessary() {
  older_than ./bin/$1 $1.c greatest.h build && {
    $CC $CFLAGS $1.c -o ./bin/$1
  }
  return 0  # success
}

update_if_necessary mmap-demo
update_if_necessary compiling-integers
update_if_necessary compiling-immediates
update_if_necessary compiling-unary
update_if_necessary compiling-binary
update_if_necessary compiling-reader
update_if_necessary compiling-let
update_if_necessary compiling-if
update_if_necessary compiling-heap
update_if_necessary compiling-procedures
update_if_necessary compiling-closures
update_if_necessary compiling-elf

exit 0