re-stage files changed by end-of-file-fixer hook

[najisawas]

curious what the discussion around supporting an --autofix flag for the end-of-file-fixer is. It seems odd to me that although the hook fixes the issue, it won't re-stage the file and follow through with the commit if it is the only issue / adjustment to the file / commit. Currently a user's work flow is that they must restage and re-run git commit if this fails, which is slightly tedious and seems confusing

[asottile]

see this SO answer

or these duplicate issues:

• Hook that updates files #532
• yapf -i and pass pre-commit check #747
• Automatically stage files changed by hook #806
• Add changes generated by pre-commit #879
• (there's more, but you get the idea)