Allow multiline commit messages when using a custom .cz.toml

Description

I would like to be able to write multiline commit messages, however this does not seem to be possible when configuring commitizen using .cz.toml.

Possible Solution

Based off of #74 it seems to work when you customize commitizen via a class, however the filter parameter in .cz.toml doesn’t seem to work for this use case currently (it gives me ValueError: 'filter' needs to be function that accepts an argument no matter what I input).

One suggestion would be if you could enclose your commit message in double quotes, and any enter keypress within those double quotes would just input a newline to the commit message instead of ending the text input. Another suggestion would be if you could specify a parameter multiline or similar which upon asking the question opens up a default editor (nano/vim) where the user writes their message, just like how git does with git commit.

[Lee-W]

Thanks @marier-nico ! Didn’t notice this cool new feature.

But the behavior would change a bit. If we apply this, we’ll need to type Esc, Enter or Alt, Enter when we type the message. Another idea is making it configurable. If not enabled, we’ll keep the original | behavior. @Woile What do you think?

[Lee-W]

Hi @arunanshub , the feature you propose was actually discussed on https://github.com/commitizen-tools/commitizen/issues/248. But the problem of this issue I that we did not make our cz rules highly configurable except cz_cutsomize.