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WIP: enable post processing of scanned file with external shell script

Lars K.W. Gohlke requested to merge lkwg82/simple-scan:post-processing into main

I still missed the OCR feature (see #1) so I found ocrmypdf. Which does its job pretty well.

So I love the simplicity of simple-scan and the cability to have searchable pdfs.

new functionality

It extends the BookSaver to delegate post-processing to an external script.

In this example implementation the scripts invokes ocrmypdf. Communication is done via environment variables.

How to use:

# compilation
meson --prefix $PWD/_install _build
ninja -C _build all install 

# running
export GNOME_SIMPLE_SCAN_POST_PROCESS_SCRIPT=./simple-scan-post-process.sh
export GNOME_SIMPLE_SCAN_LOG=1
XDG_DATA_DIRS=_install/share:$XDG_DATA_DIRS ./_install/bin/simple-scan --debug test

This is my first working draft as a first time vala coder ;).

Edited by Bartosz

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