# sh-include 1.0.3 (1999-Sep-12-Sun)
# Adam M. Costello <amc@cs.berkeley.edu>

# Source this file from a Bourne shell script to define the include
# function.  If this file is in PATH, you can just do ". sh-include".
# This file should not be executable.

# include file.h
#
# This runs file.h through cpp and assigns the #defined symbols (but not
# the macros with parameters) to shell variables of the same names.
#
# include -later file.h
#
# Rather than assigning the variables, this outputs Bourne shell code to
# assign the variables, which could then be sourced or eval'd.
#
# All variables internal to this script begin with "__include_" to avoid
# conflicts with the caller, and they are unset before it returns.

# Configure:

__include_cpp="cpp -P"
__include_awk=awk

# End configuration.

include() {
  __include_tmp=/tmp/include$$

  if [ "$1" = -later ]; then
    shift
    __include_later=yes
  else
    __include_later=no
  fi

  __include_hfile=$1

  # Extract only the preprocessor directives:

  $__include_awk '$1 ~ /^#/ {
    print;

    while ($0 ~ /\\$/) {
      if (!(getline)) break;
      print;
    }
  }' $__include_hfile > $__include_tmp.defs

  # Copy the directives and append code to assign the variables:

  cp $__include_tmp.defs $__include_tmp.h
  echo ": 2791024743" >> $__include_tmp.h

  $__include_awk '{
    if ($1 == "#define") name = $2;
    else if ($1 == "#" && $2 == "define") name = $3;
    else next;

    if (name ~ /\(/) next;
    print "read \"" name "\" << \"2791024743\"";
    print name;
    print "2791024743";
  }' $__include_tmp.defs >> $__include_tmp.h

  # Run through cpp to generate the real code, which we either output or
  # source:

  if [ $__include_later = yes ]; then
    $__include_cpp $__include_tmp.h |
      $__include_awk 'ok; /2791024743/ {ok = 1}'
  else
    $__include_cpp $__include_tmp.h > $__include_tmp.sh
    . $__include_tmp.sh
    rm $__include_tmp.sh
  fi

  # Clean up:

  rm $__include_tmp.defs $__include_tmp.h
  unset __include_cpp __include_awk
  unset __include_tmp __include_later __include_hfile
}