Excluding formatting of code lines or blocks selectively

[johnalotoski]

Feature request:

• Occasionally there is a section of code in a nix file which I'd like to purposely exclude from formatting for various reasons
• In these cases, the option of excluding code formatting on a single line basis (ex: comment exclusion identifier) or code block basis (between exclusion demarcation identifiers) would be a nice feature to have.
• In these cases, whole file basis exclusion is not granular enough

Thanks for this great formatter!

[blaggacao]

from black a spec could be

# fmt: on
# fmt: off

or branded (:smile:):

# ale: on
# ale: off

[adrian-gierakowski]

this would also provide a way temporarily work around bugs while they are being fixed