preview reader

1 files changed, 39 insertions, 0 deletions

diff --git a/bsie/reader/preview/__init__.py b/bsie/reader/preview/__init__.py
new file mode 100644
index 0000000..3e69a4a
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+++ b/bsie/reader/preview/__init__.py
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+"""
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# imports
+import typing
+
+# external imports
+import PIL.Image
+
+# inner-module imports
+from .. import chain
+
+# constants
+_FILE_FORMAT_READERS: typing.Sequence[str] = (
+    # native image formats
+    __package__ + '._pillow.PillowPreviewReader',
+    __package__ + '._rawpy.RawpyPreviewReader',
+    # multiformat readers
+    __package__ + '._pg.PreviewGeneratorReader',
+    )
+
+# exports
+__all__: typing.Sequence[str] = (
+    'Preview',
+    )
+
+
+## code ##
+
+class Preview(chain.ReaderChain[typing.Callable[[int], PIL.Image.Image]]): # pylint: disable=too-few-public-methods
+    """Create a preview from a file."""
+
+    def __init__(self, cfg: typing.Optional[typing.Any] = None):
+        super().__init__(_FILE_FORMAT_READERS, cfg)
+
+## EOF ##