#!/bin/sh

set -Ceu

# Run from the top-level Nouveau source directory.  This stupid kludge
# reinterprets the GNU makefile as a BSD makefile to extract the source
# file names, renames the ones that have obscure and/or colliding
# basenames to be less obscure and unlikely (though not guaranteed) to
# collide, and spits out config(5) directives for all of them.

nouveau_top=external/bsd/drm2/dist/drm/nouveau
nouveau_flag=nouveau

filemap=

clean ()
{
	[ -z "$filemap" ] || rm -f -- "$filemap" || :
}

filemap="$(mktemp -t ${0##*/})"

cat Makefile								\
| sed -e 's,^include \(.*\)$,.include "\1",'				\
| sed -e 's,^ifdef \(.*\)$,.if !empty(\1:M[yY][eE][sS]),'		\
| sed -e 's,^endif$,.endif,'						\
| make -f /dev/stdin -V nouveau-y src=.					\
| tr ' ' '\n'								\
| sed -e 's,^$,,'							\
| sort -u								\
| sed -e 's,\.o$,.c,'							\
| awk '
	BEGIN {
		duplicates = 0
	}
	$1 ~ "nouveau_[^/]*$" {
		next
	}
	{
		if (index($1, "/")) {
			dir = $1
			sub("/[^/]*$", "/", dir)
		} else {
			dir = ""
		}
		base = $1
		sub("^core/", "", base)
		gsub("/", "_", base)
		if (seen[base]) {
			printf("Duplicate basename: %s %s\n", seen[base], $1) \
			    > "/dev/stderr"
			duplicates = 1
		}
		if (duplicates)
			next
		seen[base] = $1
		printf("%s %s\n", $1, dir "nouveau_" base)
	}
	END {
		if (duplicates) {
			printf("Time to rewite me!\n") > "/dev/stderr"
			exit 1
		}
	}
' >> "$filemap"

while read from to; do
	echo mv -f -- "$from" "$to" >&2
        printf 'file\t%s\t%s\n' "$nouveau_top/$to" "$nouveau_flag"
done < "$filemap"