72-column wrapping in git commit mode

[chris-martin]

It seems the standard max line length for git commits is 72 characters. gitCommitMode is currently using the standard modePrettify which wraps at column 80. Does it make sense to change this in yi?

[noughtmare]

I think it would be nice to at least have the 80 column paragraph width be configurable. But I personally don't use this feature very much, so I probably won't work on this anytime soon.

[chris-martin]

Would it make sense to add a field modePreferredLineLength :: Maybe Int (where Nothing means use some global default) to the Mode type, and then alter the modePrettify implementations for the various modes that ought to respect that setting?

[noughtmare]

I've just opened #1069 to track how the current configuration system can be improved.

For the time being, I think a modePreferredLineLength is acceptable.