feat: Add optimized file formats - #57
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📝 WalkthroughWalkthroughChangesThe change adds CrossPoint EPUB output
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Calibre
participant CrossPointReaderDevice
participant CrossPointEpubDispatcher
participant optimize_epub
participant OutputFile
Calibre->>CrossPointReaderDevice: initialize enabled device
CrossPointReaderDevice->>Calibre: register output plugins
Calibre->>CrossPointEpubDispatcher: request EPUB conversion
CrossPointEpubDispatcher->>CrossPointEpubDispatcher: select X3 or X4 by suffix
CrossPointEpubDispatcher->>optimize_epub: optimize temporary EPUB
optimize_epub->>OutputFile: write optimized EPUB
Merge Risk: ⚪ Minimal · up to The new optimized EPUB formats and conditional registration have no unresolved merge-blocking risk. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@crosspoint_reader/__init__.py`:
- Line 32: Update the plugin registration around ui._initialized_plugins and
output_plugins so disabled CrossPoint Reader devices do not register or expose
x3.epub and x4.epub. Use ui.is_disabled(self) to skip registration when
disabled, or otherwise propagate the device’s disabled state to each registered
output plugin while preserving registration when enabled.
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README.mdcrosspoint_reader/README.mdcrosspoint_reader/__init__.pycrosspoint_reader/output.pycrosspoint_reader/plugin-import-name-crosspoint_reader.txt
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🧰 Additional context used
🪛 ast-grep (0.45.3)
crosspoint_reader/output.py
[warning] 70-70: File path is request-/variable-derived; validate and normalize to prevent path traversal.
Context: open(source_path, 'rb')
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(open-filename-from-request)
1 participant
Summary
Addresses #36 and partially addresses #37 (by making it possible to simply move manually converted/optimized files to arbitrary storage devices including SD cards)
Problem. I would like to be able to save the optimized files produced via the optimizer so that I can reuse the files later (and specifically host an OPDS catalog of optimized books/put them on multiple devices). I admit that this is probably not a common use case, but broadly it seems like it makes sense to me to not require entangling file optimization and transfer to device.
Solution. I added 2 new OutputFilePlugins which let you in the file conversion tool convert directly to an '.X3.EPUB' or an '.X4.EPUB' file. These files are still just regular epubs, but run with the optimizer for those specific devices. I am not incredibly tied to those names, so if there are alternative suggestions for how we could denote files as appropriately optimized epubs, I'd be interested. One idea that I didn't end up going with was just a
.crosspoint.epubformat that tried to be optimized for both at the same time, rather than being so device specific.The above implementation was relatively straightforward. The two less intuitive parts of this solution are:
Testing
After installing the plugin, I ran a few conversions, both from epub->x4.epub, epub->x5.epub, and mobi->epub, and all worked exactly as expected
AI Usage
Did you use AI tools to help write this code? YES (most of the code was produced by Copilot/GPT-5.6, I reviewed it all and am proficient in python but am not proficient in the Calibre ecosystem in particular)