In the Phoenix Guides it is some times said “Update” the file and a listing with some lines marked with - or + in the left margin is given.
Does this mean that I should remove and add respectively the lines?
Or is there a mix verb that does this?
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Yep, you got it
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Yes, it means this.
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It is unified format of representing diffs between source files.
Git uses this format for generating diffs/patches. In GitHub, you can see the same when you are looking at what changed between commits or pull requests.
For example like this commit - [phx.gen.release] Skip generating migration files when ecto_sql is no… · phoenixframework/phoenix@f4c7df3 · GitHub
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