#!/bin/sh

#printf '/* %s */\n' "$1" >> $2

if grep -q '^#define' $1; then
	grep ' *extern.*;$' $1 >> $2
	grep -E '^#(if|def|undef|el|end)' $1 >> $2

elif grep -q '^typedef' $1; then
	if grep -q '^#ifdef' $1; then
		sed -ne '/#ifdef/,/#endif/p' $1 >> $2
	elif grep -q '^typedef.*;$' $1; then
		grep '^typedef' $1 >> $2
	else
		sed -ne '/^typedef/,/\}.*;$/p' $1 >> $2
	fi

elif grep -Eq '^(struct|union).*{$' $1; then
	if grep -q '^struct' $1; then
		sed -ne '/^struct/,/\};/p' $1 >> $2
	else
		sed -ne '/^union/,/\};/p' $1 >> $2
	fi

elif grep -q '^[a-zA-Z_].*;$' $1; then
	printf 'extern %s' "$(grep '^[a-zA-Z_].*;$' $1)" >> $2

elif grep -q 'TGFN' $1; then
	printf '%s;\n' "$(sed -e "/{/q" $1 | tail -n2 | head -n1 | m4 '-DTGFN=$1' -DTYPE=double)" >> $2

else
	printf '%s;\n' "$(sed -e "/{/q" $1 | tail -n2 | head -n1)" >> $2
fi

#printf '\n' >> $2