I like my approach (and git diff approach) more because it is the least
surprising:
$ diff | program > file

should produce a valid diff and

$ diff --color=yes | program > file

should produce a colored diff.

I expect that if GNU diff ever gets colored output, it will have this
behaviour (like grep and git diff do).

But I fully understand that changing the defaults once set is difficult.
Feel free to close this as wontfix.

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https://bugs.launchpad.net/bugs/1161826

Title:
  smarter handling of redirections and add --color option to override
  auto settings

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