chore: embed DistancePrinter under src/diffpy

pyproject.toml

@@ -33,7 +33,7 @@ classifiers = [
 ]
 
 [project.scripts]
-distanceprinter = 'DistancePrinter.distanceprinter:main'
+distanceprinter = 'diffpy.distanceprinter.distanceprinter:main'
 
 [project.urls]
 Homepage = "https://github.com/diffpy/diffpy.distanceprinter/"
@@ -46,7 +46,7 @@ dev_template = "{tag}"
 dirty_template = "{tag}"
 
 [tool.setuptools.packages.find]
-where = ["DistancePrinter"]  # list of folders that contain the packages (["."] by default)
+where = ["src"]  # list of folders that contain the packages (["."] by default)
 include = ["*"]  # package names should match these glob patterns (["*"] by default)
 exclude = []  # exclude packages matching these glob patterns (empty by default)
 namespaces = false  # to disable scanning PEP 420 namespaces (true by default)

src/diffpy/__init__.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+##############################################################################
+#
+# DistancePrinter   by Simon J. L. Billinge group
+#                   (c) 2013 Trustees of the Columbia University
+#                   in the City of New York.  All rights reserved.
+#
+# File coded by:    Xiaohao Yang
+#
+# See AUTHORS.txt for a list of people who contributed.
+# See LICENSENOTICE.txt for license information.
+#
+##############################################################################
+
+# Placeholder until this gets scikit-packaged later

tests/test_distanceprinter.py

@@ -1,7 +1,7 @@
 import os
 from io import open
 
-from DistancePrinter.distanceprinter import main
+from diffpy.distanceprinter.distanceprinter import main
 
 
 def test_distanceprinter(monkeypatch):