From 068b3651c16916877eb8d5fdfec52485a507e204 Mon Sep 17 00:00:00 2001
From: Matthias Baumgartner <dev@igsor.net>
Date: Mon, 31 Oct 2022 13:05:31 +0100
Subject: path and stat readers

---
 bsie/reader/__init__.py  | 19 +++++++++++++++++++
 bsie/reader/path.py      | 31 +++++++++++++++++++++++++++++++
 bsie/reader/stat.py      | 34 ++++++++++++++++++++++++++++++++++
 test/reader/test_path.py | 28 ++++++++++++++++++++++++++++
 test/reader/test_stat.py | 34 ++++++++++++++++++++++++++++++++++
 5 files changed, 146 insertions(+)
 create mode 100644 bsie/reader/__init__.py
 create mode 100644 bsie/reader/path.py
 create mode 100644 bsie/reader/stat.py
 create mode 100644 test/reader/test_path.py
 create mode 100644 test/reader/test_stat.py

diff --git a/bsie/reader/__init__.py b/bsie/reader/__init__.py
new file mode 100644
index 0000000..a45f22b
--- /dev/null
+++ b/bsie/reader/__init__.py
@@ -0,0 +1,19 @@
+"""The Reader classes return high-level content structures from files.
+
+The Reader fulfills two purposes:
+    First, it brokers between multiple libraries and file formats.
+    Second, it separates multiple aspects of a file into distinct content types.
+
+Often, different libraries focus on reading different types of content from a
+file. E.g. one would use different modules to read file system infos than to
+read exif or pixel data of an image. Hence, this module is organized by content
+type. Each distinct type can be implemented in a file or submodule that
+provides a Reader implementation. Through utilization of submodules, different
+file formats can be supported.
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+
+## EOF ##
diff --git a/bsie/reader/path.py b/bsie/reader/path.py
new file mode 100644
index 0000000..d27c664
--- /dev/null
+++ b/bsie/reader/path.py
@@ -0,0 +1,31 @@
+"""The Path reader produces a file path.
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import os
+import typing
+
+# inner-module imports
+from bsie.base import reader
+
+# exports
+__all__: typing.Sequence[str] = (
+    'Path',
+    )
+
+
+## code ##
+
+class Path(reader.Reader):
+    """Return the path."""
+
+    CONTENT_TYPE = typing.Union[str]
+
+    def __call__(self, path: str) -> CONTENT_TYPE:
+        return path
+
+
+## EOF ##
diff --git a/bsie/reader/stat.py b/bsie/reader/stat.py
new file mode 100644
index 0000000..f0b83fb
--- /dev/null
+++ b/bsie/reader/stat.py
@@ -0,0 +1,34 @@
+"""The Stat reader produces filesystem stat information.
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import os
+import typing
+
+# inner-module imports
+from bsie.base import reader, errors
+
+# exports
+__all__: typing.Sequence[str] = (
+    'Stat',
+    )
+
+
+## code ##
+
+class Stat(reader.Reader):
+    """Read and return the filesystem's stat infos."""
+
+    CONTENT_TYPE = typing.Union[os.stat_result]
+
+    def __call__(self, path: str) -> CONTENT_TYPE:
+        try:
+            return os.stat(path)
+        except Exception:
+            raise errors.ReaderError(path)
+
+
+## EOF ##
diff --git a/test/reader/test_path.py b/test/reader/test_path.py
new file mode 100644
index 0000000..fd7bc5a
--- /dev/null
+++ b/test/reader/test_path.py
@@ -0,0 +1,28 @@
+"""
+
+Part of the bsie test suite.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import unittest
+
+# objects to test
+from bsie.reader.path import Path
+
+
+## code ##
+
+class TestPath(unittest.TestCase):
+    def test_call(self):
+        self.assertEqual('', Path()(''))
+        self.assertEqual('/tmp/foo/bar', Path()('/tmp/foo/bar'))
+        self.assertEqual('/home/myself/some file', Path()('/home/myself/some file'))
+
+
+## main ##
+
+if __name__ == '__main__':
+    unittest.main()
+
+## EOF ##
diff --git a/test/reader/test_stat.py b/test/reader/test_stat.py
new file mode 100644
index 0000000..d12ad9c
--- /dev/null
+++ b/test/reader/test_stat.py
@@ -0,0 +1,34 @@
+"""
+
+Part of the bsie test suite.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import os
+import unittest
+
+# bsie imports
+from bsie.base import errors
+
+# objects to test
+from bsie.reader.stat import Stat
+
+
+## code ##
+
+class TestPath(unittest.TestCase):
+    def test_call(self):
+        # test self
+        self.assertEqual(os.stat(__file__), Stat()(__file__))
+        # test invalid file
+        self.assertRaises(errors.ReaderError, Stat(), '')
+        self.assertRaises(errors.ReaderError, Stat(), None)
+
+
+## main ##
+
+if __name__ == '__main__':
+    unittest.main()
+
+## EOF ##
-- 
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