How to make `truncate-lines` nil and `auto-fill-mode` off in magit buffers

Question

I got

(setq-default fill-column 80)
(setq-default truncate-lines nil) ;; which is default

When using magit in Emacs, I know that I should avoid long commit messages, but sometimes they just cannot be avoid.

The problem is: (setq-default truncate-lines nil) which is default setting does not work in magit: project buffer(there is a straight right arrow at the end of line), the (setq-default fill-column 80) does not work in COMMIT_EDITMSG buffer, and the fill-column value in it is 72 not 80.

But what I really want is: make the truncate-lines to nil in magit: project buffer as well so I can see long lines in one window but not break it into several different lines, AND turn on auto-fill-mode in COMMIT_EDITMSG buffer, so long commit messages won't be broken into several different lines while I'm typing.

NOTE: DO NOT affect other buffers like magit-log buffer

Answer 1

1. You can add setting specific to magit-status to magit-status-mode-hook:

   (add-hook 'magit-status-mode-hook
             (lambda () 
                (setq truncate-lines nil)))
   

2. Starting with Magit v2.1.0, COMMIT_EDITMSG files are edited usingtext-mode with the minor mode git-commit-mode also turned on. You need to add your configuration to git-commit-mode-hook:

   (add-hook 'git-commit-mode-hook 'turn-off-auto-fill)