Pager wrapper working with man but not with nnn help

[ghost]

In order to handle the different ways in which man pages and my keyboard encode hyphens, I created the following wrapper around my pager:

#!/usr/bin/env bash
printf "%s" "$(cat)" | sed $'s/\u2010/\u002d/g' | moar

And I set it to the "PAGER" env variable.

It is working correctly with man pages, e.g.:

But not with nnn help (?). This is what is shown:

It's like is passing empty page.

Of course nnn help works correctly with bare moar, or bare less for that matter.

Do you know why?

[N-R-K]

1. printf "%s" "$(cat)" sed should be able to read from stdin just fine, so this looks entirely useless
2. Your wrapper doesn't seem to handle files passed via argument

change it to sed $'s/\u2010/\u002d/g' "$@" | moar and see if that works.

[ghost]

It does work.
Altough I'm not understanding the behavior: sed reads from stdin, and if nothing is in std, it reads from command line arguments?

EDIT: Yes, it's the other way around.
From sed's manpage:

All remaining arguments are names of input files; if no input files are specified, then the standard input is read.

So nnn is passing its help as command line argument it seems?

[N-R-K]

Yes, most unix utilities behave that way (with certain exceptions such as tr). If you give it a file then it'll use the file - so catting things into something is usually a useless use of cat.

[ghost]

Thanks! I learnt a new thing!