preprocessing slides using figlet and boxes does not work about slides HOT 4 CLOSED

Hey, this definitely looks correct! What version of slides are you on? This feature was introduced in v0.4.0

Also, does all pre-processing not work? Can you do a simple:

~~~echo hello
should be erased
~~~~

Also, does your file have execution permissions? chmod +x file.md. This is needed for security reasons since this executes code on your system so the file must be executable to ensure you've opted-in to pre-processing.

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This is a great use-case of pre-processing though! Thanks for using slides! 😄

I suspect you are just missing the chmod +x slides.md

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It works for me! (with the file being executable)

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Thanks again for the fast reaction time and for sharing slides with the world.

Okay, it works now. Thank you so much.

Of course it was my fault. I had used chmod 754 slides.md instead of chmod +x slides.md. I thought it should be enough when I (the owner) or my group have execution rights, but it's the "others" that need it.

One more side note...
The example in the README.md or preprocess.md shows only the 3 tilde before and after. But according to the example above and also when looking at your markdown examples in RAW format, I can that also the 3 backticks before and after are required, otherwise slides prints a bunch of dashes right before the replaced text.
I assume that GitHub is removing the 3 backticks when rendering these markdown files here. Maybe you can add a sentence that mentions that the 3 backticks before and after are required but GitHub doesn't show them properly.

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