diff --git a/tools/build b/tools/build
index 1ad4124..63a02d6 100755
--- a/tools/build
+++ b/tools/build
@@ -1,36 +1,58 @@
-#!/usr/bin/env bash
+#!/usr/bin/env python3
 
-## functions
-
-function syntaxerror
-{
-	echo "SYNTAX: build <revision> [<format>]" > /dev/stderr
-	exit 1
-}
+import typing as _typing
+import sys as _sys
+import os as _os
+import argparse as _argparse
 
 
-## consts
+def main():
+	## consts
+	dir_source = "source"
+	
+	## args
+	argument_parser = _argparse.ArgumentParser()
+	argument_parser.add_argument(
+		"-r",
+		"--revision",
+		type = str,
+		dest = "revision",
+		default = None,
+	)
+	argument_parser.add_argument(
+		"-f",
+		"--format",
+		type = str,
+		dest = "format",
+		default = "sqlite",
+	)
+	args = argument_parser.parse_args()
+	
+	## vars
+	revisions = sorted(
+		list(
+			map(
+				lambda name: name.split(".sindri.json")[0],
+				_os.listdir(_os.path.join(dir_source, "structure"))
+			)
+		)
+	)
+	revision = (args.revision or revisions[-1])
+	
+	## exec
+	_sys.stderr.write("-- data\n")
+	_os.system(
+		"cat %s/structure/%s.sindri.json | tools/sindri/sindri --format='database:%s'"
+		% (
+			dir_source,
+			revision,
+			args.format,
+		)
+	)
+	_sys.stderr.write("-- meta\n")
+	_sys.stdout.write("DROP TABLE IF EXISTS _meta;\n")
+	_sys.stdout.write("CREATE TABLE _meta(revision VARCHAR(15) NOT NULL);\n")
+	_sys.stdout.write("INSERT INTO _meta(revision) VALUES ('%s');\n" % revision)
+	
 
-dir_source="source"
-dir_build="build"
-
-
-## args
-
-if [ $# -ge 1 ] ; then revision=$1 && shift ; else syntaxerror ; fi
-if [ $# -ge 1 ] ; then format=$1 && shift ; else format="sqlite" ; fi
-
-
-## exec
-
-mkdir -p ${dir_build}
-
-echo "-- data"
-cat ${dir_source}/structure/${revision}.sindri.json | tools/sindri/sindri -f database:${format}
-echo ""
-
-echo "-- meta"
-echo "DROP TABLE IF EXISTS _meta;"
-echo "CREATE TABLE _meta(revision VARCHAR(15) NOT NULL);"
-echo "INSERT INTO _meta(revision) VALUES ('${revision}');"
-echo ""
+main()