Execute
./install.sh
to build the image (sandwich:eng-spa).
By default, English (eng) and Spanish (spa) packages are installed.
If you need another one, you must add the corresponding package (tesseract-ocr-<lang>) to the Dockerfile,
and then rebuild the image (using a descriptive :tag).
The pdfsandwich binary will run in the container that will be called through the script ./sandwich.sh.
The command line usage is almost the same as the original, except for the input and output parameters.
They should now be specified in the environment variables $INPUT and $OUTPUT.
If they are not specified, the input file will be assumed the standard input (stdin), and the output would be the file ./output.pdf.
The example below should convert a two-column pdf written in Spanish into a readable pdf.
INPUT=in.pdf OUTPUT=out.pdf ./sandwich.sh -layout double -lang spa