#!/bin/bash

# sbodl, initial public release.

SELF=$( basename $0 )

usage() {
	cat <<EOF
$SELF - download the sources for a slackbuilds.org build.
version 20140421, public release
(c) 2014 B. Watson (yalhcru at gmail dawt cawm)
Licensed under the WTFPL: Do WTF you want with this.

Usage: $SELF <wget-options>

Execute $SELF in the directory that contains the .info and .SlackBuild
files. It will use wget to download the source file(s), then check their
md5sums.

$SELF doesn't take any options itself (except --help), but any options
you pass to it will be passed to wget.
EOF
	exit 0
}

die() {
	echo "$SELF: $*" 2>&1
	exit 1
}

# check for our one argument
case "$*" in
	-h|-help|-\?|--help) usage ;;
esac

source ./$( basename $( pwd ) ).info \
	|| die "No .info file, are you sure this is a SBo directory? Try '$SELF --help'"

# This stanza copied from the SBo template for 14.1:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ "$ARCH" = "x86_64" ]; then
	DL=${DOWNLOAD_x86_64:-$DOWNLOAD}
	SUM=${MD5SUM_x86_64:-$MD5SUM}
else
	DL=$DOWNLOAD
	SUM=${MD5SUM}
fi

if [ -z "$DL" ]; then
	die "Bad .info file (no DOWNLOAD= or DOWNLOAD_x86_64=)."
fi

# save passed-in command line args for use with wget
WGETARGS="$@"

set $SUM

for dl in $DL; do
	EXTRAWGETARGS="--content-disposition "
	case "$dl" in
		*sourceforge.net/*|*.sf.net/*) EXTRAWGETARGS="--user-agent wget" ;;
		*) ;;
	esac

	FILE=$( echo "$dl" | sed 's,.*/,,' )

	wget $WGETARGS $EXTRAWGETARGS "$dl" || die "Download failed"

	if [ -e "$FILE" ]; then
		GOTSUM="$( md5sum "$FILE" | cut -d' ' -f1 )"
		if [ "$1" != "$GOTSUM" ]; then
			echo "WARN: md5sum doesn't match, expected $1, got $GOTSUM"
		else
			echo "md5sum matches OK: $1"
		fi
	else
		echo "WARN: can't find downloaded file $FILE"
	fi
	echo
	shift
done