Unbreak rune filtering functionality

[sohomdatta1]

Currently, the rune filtering functionality does not work since the check assumes that the reading of runes fails, which is incorrect in most circumstances when the FilterRunes function is called.

This patch flips the condition so that instead evaluates to true instead.

[slingamn]

Thanks!

[slingamn]

I'm just curious, what's your use case for this functionality? I'd like to get a better sense of how people are using the library.

[sohomdatta1]

I'm just curious, what's your use case for this functionality? I'd like to get a better sense of how people are using the library.

My immediate use case is to slim down https://github.com/sohomdatta1/promptui :) It appears that the upstream for that library is unmaintained and I want to update it and fix a few bugs since I depend on it for a few hobby projects :)

[slingamn]

Nice :-) What I meant was, what are you using FuncFilterInputRune for?

[sohomdatta1]

Nice :-) What I meant was, what are you using FuncFilterInputRune for?

The original library used UniqueEditLine to show an error prompt after the readline when the user puts in invalid input. That does not appears to be possible in the current version. My thought-process is to intercept the Enter character and show a error under the the prompt instead of processing the enter event if the input is invalid.

[slingamn]

If I understand the problem statement correctly, it seems like you can accomplish this by processing the return value of ReadLine(), determining that it's invalid, and then calling SetPrompt()?

[slingamn]

@sohomdatta1 I just wanted to check in about this again?