Use datetime built-in library

.gitignore

@@ -5,6 +5,10 @@ _tests/files/output-results
 #/.idea/usage.statistics.xml already included below
 #/.idea/shelf already included below
 /.vscode
+# For some reason PyCharm randomly decided to not use the uppercase Obsidian-Daylio-Parser.iml file anymore
+# One day it's like "Hey, let's switch to obsidian-daylio-parser.iml, that's a much cooler config filename!"
+# So I made a lowercase symlink and flipped PyCharm off
+/.idea/obsidian-daylio-parser.iml
 /.idea/inspectionProfiles/Project_Default.xml
 /.idea/Obsidian-Daylio-Parser.bak.iml
 

Dockerfile

@@ -5,12 +5,9 @@ LABEL org.label-schema.name="Obsidian Daylio Parser"
 LABEL org.label-schema.description="Convert .csv Daylio backup into markdown notes."
 LABEL org.label-schema.url="https://github.com/DeutscheGabanna/Obsidian-Daylio-Parser/"
 
-COPY src /app/src/
-COPY _tests /app/_tests/
-
 WORKDIR /app
+COPY tests .
+RUN pip install daylio-obsidian-parser
 
-RUN mkdir output
-
-ENTRYPOINT [ "python", "src/main.py" ]
-CMD [ "_tests/sheet-1-valid-data.csv", "output"]
+ENTRYPOINT ["daylio_to_md"]
+CMD ["--help"]

Dockerfile-test-suite

@@ -0,0 +1,13 @@
+FROM python:3.13.0b2-slim-bookworm
+
+LABEL org.label-schema.schema-version="1.0"
+LABEL org.label-schema.name="Obsidian Daylio Parser"
+LABEL org.label-schema.description="Convert .csv Daylio backup into markdown notes."
+LABEL org.label-schema.url="https://github.com/DeutscheGabanna/Obsidian-Daylio-Parser/"
+
+WORKDIR /app
+COPY tests/  .
+RUN pip install daylio-obsidian-parser
+
+ENTRYPOINT ["daylio_to_md"]
+CMD ["--help"]

src/daylio_to_md/__main__.py

@@ -1,7 +1,8 @@
 import sys
+import logging
 
 from daylio_to_md.config import options
-from daylio_to_md.librarian import Librarian
+from daylio_to_md.librarian import Librarian, CannotAccessJournalError, EmptyJournalError
 
 
 def main():
@@ -17,4 +18,12 @@ def main():
 
 
 if __name__ == '__main__':
-    main()
+    try:
+        main()
+    except CannotAccessJournalError as err:
+        # Invoking help() instead of writing it directly just helps to cut down on duplicate strings
+        logging.getLogger(__name__).critical(err.__doc__)
+        sys.exit(1)
+    except EmptyJournalError as err:
+        logging.getLogger(__name__).critical(err.__doc__)
+        sys.exit(2)

src/daylio_to_md/config.py

@@ -20,7 +20,10 @@
         ├── suffix
         ├── colour
         └── header
+
 """
+# https://www.doc.ic.ac.uk/~nuric/posts/coding/how-to-handle-configuration-in-python/
+
 import argparse
 import logging
 from typing import List, Any