Review Request 127158: Adds writer and external (extractor and writer) plugin support

[Varun Joshi]

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https://git.reviewboard.kde.org/r/127158/
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Review request for Baloo, KDE Frameworks and Vishesh Handa.


Repository: kfilemetadata


Description
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Builds upon Boudhyan Gupta's work on external extractors, creating a process that runs a script that extracts/writes data, accepting input and producing an output (JSON-formatted) via stdin/stdout.

Adds Writer, WriterData, WriterPlugin and WriterCollection classes, analogous to the Extractor classes. The only notable difference is that consumer applications will be able to use WriteData (analogous to ExtractionResult) without subclassing it.

Adds ExternalWriter and ExternalExtractor classes. These handle input/output and communication with the external plugins.


Diffs
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  README.md 19b1a26a241e6a35c636aaf8162afe762018f073 
  autotests/CMakeLists.txt 9d308367838680f1081cfa3b583d3401412c21c1 
  autotests/taglibwritertest.h PRE-CREATION 
  autotests/taglibwritertest.cpp PRE-CREATION 
  src/CMakeLists.txt a5490856a51aa2f59389ee963f3430c1ce5c60d5 
  src/config-kfilemetadata.h.in PRE-CREATION 
  src/externalextractor.h PRE-CREATION 
  src/externalextractor.cpp PRE-CREATION 
  src/externalwriter.h PRE-CREATION 
  src/externalwriter.cpp PRE-CREATION 
  src/extractorcollection.h 8542aed576102be2b0c86bbdf3d65d756d468c6e 
  src/extractorcollection.cpp a1bde65bf57e493918cd3e85ccdb23c4cd623401 
  src/extractorplugin.h 65abad3b2397628ba42a40d9ef2970e02114e250 
  src/extractors/CMakeLists.txt 5dd223e1cf6864a943e848664ad5fae0d0603e77 
  src/extractors/externalextractors/CMakeLists.txt PRE-CREATION 
  src/extractors/externalextractors/exampleextractor/main.py PRE-CREATION 
  src/extractors/externalextractors/exampleextractor/manifest.json PRE-CREATION 
  src/extractors/externalextractors/pdfextractor/main.py PRE-CREATION 
  src/extractors/externalextractors/pdfextractor/manifest.json PRE-CREATION 
  src/writedata.h PRE-CREATION 
  src/writedata.cpp PRE-CREATION 
  src/writer.h PRE-CREATION 
  src/writer.cpp PRE-CREATION 
  src/writer_p.h PRE-CREATION 
  src/writercollection.h PRE-CREATION 
  src/writercollection.cpp PRE-CREATION 
  src/writerplugin.h PRE-CREATION 
  src/writerplugin.cpp PRE-CREATION 
  src/writers/CMakeLists.txt PRE-CREATION 
  src/writers/externalwriter.h PRE-CREATION 
  src/writers/externalwriter.cpp PRE-CREATION 
  src/writers/externalwriters/CMakeLists.txt PRE-CREATION 
  src/writers/externalwriters/pdfwriter/main.py PRE-CREATION 
  src/writers/externalwriters/pdfwriter/manifest.json PRE-CREATION 
  src/writers/taglibwriter.h PRE-CREATION 
  src/writers/taglibwriter.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/127158/diff/


Testing
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Created a sample PDF reader and extractor in Python, both of which work successfully.


Thanks,

Varun Joshi

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