I'm not sure what the circumstances are, but it looks like unpaper can
attempt to write a temporary file that already exists [0]. This then
fails the consumption. As per daedadu's comment simply letting unpaper
overwrite files fixes this.
[0]
unpaper: error: output file '/tmp/paperless/paperless-pjkrcr4l/convert-0000.unpaper.pnm' already present.
See https://web.archive.org/web/20181008081515/https://github.com/danielquinn/paperless/issues/406#issue-360651630
Properties should use snake_case, and only constants should be ALL_CAPS.
This change also makes use of the convention of "private" properties
being prefixed with `_`.
I've broken out the OCR-specific code from the consumers and dumped it
all into its own app, `paperless_tesseract`. This new app should serve
as a sample of how to create one's own consumer for different file
types.
Documentation for how to do this isn't ready yet, but for the impatient:
* Create a new app
* containing a `parsers.py` for your parser modelled after
`paperless_tesseract.parsers.RasterisedDocumentParser`
* containing a `signals.py` with a handler moddelled after
`paperless_tesseract.signals.ConsumerDeclaration`
* connect the signal handler to
`documents.signals.document_consumer_declaration` in
`your_app.apps`
* Install the app into Paperless by declaring
`PAPERLESS_INSTALLED_APPS=your_app`. Additional apps should be
separated with commas.
* Restart the consumer
