diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..e69de29
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..e69de29
diff --git a/src/procrusql-fit b/src/procrusql-fit
new file mode 100755
index 0000000..a086a29
--- /dev/null
+++ b/src/procrusql-fit
@@ -0,0 +1,25 @@
+#!/usr/bin/python3
+import logging
+import sys
+
+import psycopg2
+
+import procrusql
+import procrusql.parser
+
+if __name__ == "__main__":
+    logging.basicConfig(format="%(asctime)s %(levelname)s %(name)s %(lineno)d | %(message)s", level=logging.DEBUG)
+    with open(sys.argv[1]) as rf:
+        text = rf.read()
+    ps = procrusql.parser.ParseState(text)
+
+    ps2 = procrusql.parser.parse_ruleset(ps)
+
+    if not ps2:
+        ps.printerror()
+        sys.exit(1)
+
+    db = psycopg2.connect(sys.argv[2])
+    procrusql.fit(db, ps2.ast)
+
+# vim: tw=0
diff --git a/procrusql.py b/src/procrusql/__init__.py
similarity index 100%
rename from procrusql.py
rename to src/procrusql/__init__.py
diff --git a/parse_dsl_manual b/src/procrusql/parser.py
similarity index 95%
rename from parse_dsl_manual
rename to src/procrusql/parser.py
index ecdc431..5d33596 100755
--- a/parse_dsl_manual
+++ b/src/procrusql/parser.py
@@ -291,17 +291,3 @@ def rulename():
     rulenum += 1
     return f"__rule_{rulenum}"
 
-if __name__ == "__main__":
-    logging.basicConfig(format="%(asctime)s %(levelname)s %(name)s %(lineno)d | %(message)s", level=logging.DEBUG)
-    with open(sys.argv[1]) as rf:
-        text = rf.read()
-    ps = ParseState(text)
-
-    ps2 = parse_ruleset(ps)
-
-    if not ps2:
-        ps.printerror()
-        sys.exit(1)
-
-    db = psycopg2.connect(sys.argv[2])
-    procrusql.fit(db, ps2.ast)