Error "Directive still unclosed" if the end macro have no trailiing '\n'

[14NGiestas]

When the ending macro is at the end of a file, but have no trailing '\n' fypp halts into a FyppFatalError

Steps to reproduce:

~$ cat > macro.fypp
#:mute [ENTER]
#:endmute [CTRL + D] [CTRL + D]
~$ fypp macro.fypp
macro.fypp:1: error: mute directive still unclosed when reaching end of file [FyppFatalError]

The workaround is obviously:

echo "" >> macro.fypp
fypp macro.fypp
[ No error reported ]

[aradi]

That is true, a line directive needs a trailing newline. This can lead to problems, if the line directive is a the end of the file and the newline character is missing. Due to some internal details, changing this behavior is not trivial, so I would prefer to leave it at the moment so. We might consider, though, to document it more prominently somewhere.

[14NGiestas]

It's probably hacky but can't we add a single newline when reading the files, before starting the parsing? I mean it shouldn't be a problem for generated files since it's just whitespace, then remove it from the final output in the end if that's a problem.

I didn't dig into the code yet so I'm probably not foreseeing the details.

Documenting it would be nice, I got really puzzled on why removing the : and adding it back in nvim always seemed to fix the issue and it took me a while to understand that the editor was adding a newline automatically 😄