diff --git a/mkgen b/mkgen
new file mode 100755
index 0000000..fd7870a
--- /dev/null
+++ b/mkgen
@@ -0,0 +1,89 @@
+#! /bin/sh
+
+usage()
+{
+	echo "$0 [-s <size>] [-j <jobs>] [-h] -d <root> <path>"
+}
+
+SIZE=96
+
+while getopts d:s:h arg
+do
+	case $arg in
+	d) ROOT="$OPTARG"
+	;;
+	s) SIZE="$OPTARG"
+	;;
+	h) usage
+		exit 0
+	;;
+	?) usage >&2
+		exit 1
+	;;
+	esac
+done
+
+if [ -z "$ROOT" ]; then
+	usage >&2
+	exit 1
+fi
+
+shift $(($OPTIND - 1))
+
+if [ $# != 1 ]; then
+	usage >&2
+	exit 1
+fi
+
+TDIR="$(echo "$1" | sed "s,$ROOT/user,$ROOT/thumbnails,")"
+eval find \"$1\"/* -prune >/dev/null || return 0
+mkdir -p "$TDIR"
+MK="$(echo "$TDIR/Makefile")"
+cat <<-"EOF" > "$MK"
+	.POSIX:
+EOF
+echo "DIRS=\\" >> "$MK"
+eval find \"$TDIR\"/* -prune -type d > "$TDIR/.dirs"
+
+while read dir
+do
+	D="$(echo "$dir" | sed "s, ,\\\\ ,g")"
+	echo "$D \\" >> "$MK"
+done < "$TDIR/.dirs"
+
+echo >> "$MK"
+echo "DEPS=\\" >> "$MK"
+eval find \"$1\"/* -prune -type f \
+		-a -iname '*.jpeg' \
+		-o -iname '*.jpg' \
+		-o -iname '*.png' \
+		-o -iname '*.jpeg' > "$TDIR/.files"
+
+while read f
+do
+	THUMBNAIL="$(echo "$f" | sed "s,$ROOT/user/,$ROOT/thumbnails/," \
+		| sed "s, ,\\\\ ,g")"
+	echo "$THUMBNAIL \\" >> "$MK"
+done < "$TDIR/.files"
+
+echo >> "$MK"
+echo 'all: $(DEPS) $(DIRS)' >> "$MK"
+echo 'FORCE:' >> "$MK"
+
+while read dir
+do
+	D="$(echo "$dir" | sed "s, ,\\\\ ,g")"
+	echo "$D: FORCE" >> "$MK"
+	printf '\t+cd $@ && $(MAKE)\n' >> "$MK"
+done < "$TDIR/.dirs"
+
+while read f
+do
+	THUMBNAIL="$(echo "$f" | sed "s,$ROOT/user/,$ROOT/thumbnails/," \
+		| sed "s, ,\\\\ ,g")"
+	EF=$(echo "$f" | sed "s, ,\\\\ ,g")
+	echo $THUMBNAIL: $EF >> "$MK"
+	printf '\tconvert -thumbnail x%d "$<" "$@" || :\n' $SIZE >> "$MK"
+done < "$TDIR/.files"
+
+echo "Successfully generated $MK"
diff --git a/tngen b/tngen
index 6b871de..086a0b3 100755
--- a/tngen
+++ b/tngen
@@ -4,73 +4,80 @@ set -e
 
 usage()
 {
-    echo "$0 [-s <size>] [-h] -d <dir> <path>"
+	echo "$0 [-s <size>] [-j <jobs>] [-h] -d <root> <path>"
 }
 
 SIZE=96
 
-while getopts s:d:h arg
+while getopts d:j:s:h arg
 do
-    case $arg in
-    d) DIR="$OPTARG"
-    ;;
-    s) SIZE="$OPTARG"
-    ;;
-    h) usage
-        exit 0
-    ;;
-    ?) usage >&2
-        exit 1
-    ;;
-    esac
+	case $arg in
+	d) ROOT="$OPTARG"
+	;;
+	j) JOBS="$OPTARG"
+	;;
+	s) SIZE="$OPTARG"
+	;;
+	h) usage
+		exit 0
+	;;
+	?) usage >&2
+		exit 1
+	;;
+	esac
 done
 
-if [ -z "$DIR" ]
-then
-    usage >&2
-    exit 1
+if [ -z "$ROOT" ]; then
+	usage >&2
+	exit 1
 fi
 
 shift $(($OPTIND - 1))
 
 if [ $# != 1 ]; then
-    usage >&2
-    exit 1
+	usage >&2
+	exit 1
 fi
 
-F="$1"
+DIR="$1"
 
 gen()
 {
-    IN="$1"
-    OUT="$2"
+	IN="$1"
+	OUT="$2"
 
-    if [ -z "$OUT" ]
-    then
-        echo Expected output filename >&2
-        return 1
-    fi
+	if [ -z "$OUT" ]
+	then
+		echo Expected output filename >&2
+		return 1
+	fi
 
-    mkdir -p "$(dirname "$OUT")"
+	mkdir -p "$(dirname "$OUT")"
 
-    if convert -thumbnail x$SIZE "$IN" "$OUT"
-    then
-        echo Created $OUT
-    else
-        echo Failed to create $OUT >&2
-    fi
+	if convert -thumbnail x$SIZE "$IN" "$OUT"
+	then
+		echo Created $OUT
+	else
+		echo Failed to create $OUT >&2
+	fi
 }
 
-while read f; do
-    if [ "$f" != "" ]
-    then
-        THUMBNAIL=$(echo "$f" | sed "s,$DIR/user/,$DIR/thumbnails/,")
-        gen "$f" "$THUMBNAIL"
-    fi
-done <<-EOF
-    $(find "$F" -type f \
-        -a -iname '*.jpeg' \
-        -o -iname '*.jpg' \
-        -o -iname '*.png' \
-        -o -iname '*.jpeg')
-EOF
+scan()
+{
+	while read d
+	do
+		if [ -n "$d" ]
+		then
+			scan "$d"
+		fi
+
+		"$(dirname "$0")"/mkgen -d "$ROOT" "$1"
+	done <<-EOF
+		$(eval find \"$1\"/* -prune -type d || return 0)
+	EOF
+}
+
+echo Generating Makefiles...
+scan "$DIR"
+
+cd "$ROOT/thumbnails" && make ${JOBS:+-j$JOBS}
diff --git a/watchdir b/watchdir
index fe215b2..61eb715 100755
--- a/watchdir
+++ b/watchdir
@@ -2,51 +2,52 @@
 
 usage()
 {
-    echo "$0 [-s <size>] [-r] [-h] [-d <subdir>] <dir>"
+	echo "$0 [-s <size>] [-r] [-h] [-j <jobs>] <dir>"
 }
 
 REGEN=0
 SIZE=96
 
-while getopts rs:d:h arg
+while getopts rj:s:h arg
 do
-    case $arg in
-    r) REGEN=1
-    ;;
-    s) SIZE="$OPTARG"
-    ;;
-    h) usage
-        exit 0
-    ;;
-    d) SUBDIR="$OPTARG"
-    ;;
-    ?) usage >&2
-        exit 1
-    ;;
-    esac
+	case $arg in
+	j) JOBS="$OPTARG"
+	;;
+	r) REGEN=1
+	;;
+	s) SIZE="$OPTARG"
+	;;
+	h) usage
+		exit 0
+	;;
+	?) usage >&2
+		exit 1
+	;;
+	esac
 done
 
 shift $(($OPTIND - 1))
 
 if [ $# != 1 ]; then
-    usage >&2
-    exit 1
+	usage >&2
+	exit 1
 fi
 
 DIR="$1"
 
 [ "$REGEN" -eq 1 ] && "$(dirname $0)/tngen" \
-    ${SIZE:+-s$SIZE} \
-    -d "$DIR" \
-    "$DIR/user"
+	${SIZE:+-s$SIZE} \
+	${JOBS:+-j$JOBS} \
+	-d "$DIR" \
+	"$DIR/user"
 
 while :
 do
-    F="$(inotifywait -e modify,move,create,delete \
-        --format "%w%f" -qr "$DIR/user/")"
-    sleep 1 # TODO: revisit this
-    "$(dirname $0)/tngen" \
-        ${SIZE:+-s$SIZE} \
-        -d "$DIR" \
-        "$F"
+	F="$(inotifywait -e modify,move,create,delete \
+		--format "%w%f" -qr "$DIR/user/")"
+	"$(dirname $0)/tngen" \
+		${SIZE:+-s$SIZE} \
+		${JOBS:+-j$JOBS} \
+		-d "$DIR" \
+		"$(dirname "$F")"
 done