How to do proper .mp file indentation

Hi all,

I use vim to edit metapost file (.mp file), and get the .mp file indentation from the website: https://github.com/vim/vim/blob/master/runtime/syntax/mp.vim. However, sometimes it doesn't work, especially the "end" at the end of the file sometimes at the left bottom, sometimes at the right. So I am wondering how to do proper indentation. Would someone give me a pointer? Thanks.

Best,

Yukun Tan

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