[Feature] Ability to exclude files from diffs

[hanabanashiku]

Github uses Linguist for code analysis in its repositories, and resulting from that introduced a nifty feature in its .gitattributes definitions: linguist-generated. This attribute can be used to exclude specific file types from diffs, code reviews, and hide it from showing in the file listing.
I've found that to be invaluable to working with Unity3D in order to keep .meta and .prefab files from cluttering code reviews. It would be cool to have a similar feature in Gitea

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[mattdavis90]

This would be a great feature. An alternative to the linguist-generated attribute, might be having gitea observe the -diff and -merge attributes.

Edit: Reading around and testing on my own gitea setup it looks as though the .gitattributes file may not be available within bare repos - libgit2/libgit2#3676

[kdumontnu]

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[mattdavis90]

@KN4CK3R You beat me to it, with a much cleaner solution 😄 Was fun to play around though.

My less elegant approach is here in case there is anything of use.

It attempts to find the .gitattributes file on the current commit and temporarily stores it in <repo>/info/attributes so that it is available to the git diff command later. A little hacky, and I'm sure there is probably an issue if two API calls come in together.