Allow run_tests to be run from different directories

run_tests.py

@@ -1,18 +1,47 @@
 #!/usr/bin/env python
-if __name__ == '__main__':
+import sys
+
+
+def get_this_script_fpath():
+    import pathlib
+    try:
+        fpath = pathlib.Path(__file__)
+    except NameError:
+        # This is not being run from a script, thus the developer is doing some
+        # IPython hacking, so we will assume a path on the developer machine.
+        fpath = pathlib.Path('~/code/ubelt/run_tests.py').expanduser()
+        if not fpath.exists():
+            raise Exception(
+                'Unable to determine the file path that this script '
+                'should correspond to')
+    return fpath
+
+
+def main():
     import pytest
-    import sys
+    import os
+
+    repo_dpath = get_this_script_fpath().parent
+
     package_name = 'ubelt'
-    mod_dpath = 'ubelt'
-    test_dpath = 'tests'
+    mod_dpath = repo_dpath / 'ubelt'
+    test_dpath = repo_dpath / 'tests'
+    config_fpath = repo_dpath / 'pyproject.toml'
+
     pytest_args = [
-        '--cov-config', 'pyproject.toml',
+        '--cov-config', os.fspath(config_fpath),
         '--cov-report', 'html',
         '--cov-report', 'term',
         '--durations', '100',
         '--xdoctest',
         '--cov=' + package_name,
-        mod_dpath, test_dpath
+        os.fspath(mod_dpath),
+        os.fspath(test_dpath)
     ]
     pytest_args = pytest_args + sys.argv[1:]
-    sys.exit(pytest.main(pytest_args))
+    ret = pytest.main(pytest_args)
+    return ret
+
+
+if __name__ == '__main__':
+    sys.exit(main())