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5715 :: diff lib

[2019-12-19T11:34:20+01:00]

marks (orginal) [2019-12-19T11:34:20+01:00] view original

I've ported Python's difflib's sequence matcher to pure Nim: diff.

It can be used to see the differences between any two sequences of items that support == and hash() (string, char, or any custom item type with the necessary support).

mratsim (orginal) [2019-12-19T13:48:13+01:00] view original

I have an advanced differ for arbitrary Nim types if you want to study how to transform yours into macro. My use-case is for a test suite so I throw an exception as soon as there is a mismatch.

https://github.com/status-im/nim-beacon-chain/blob/9050db7b/tests/helpers/debug_state.nim#L39-L114

marks (orginal) [2019-12-19T17:35:25+01:00] view original

I think we're doing two different kinds of diff. My library takes sequences a and b and returns a sequence of "spans" (i.e., insert/delete/replace a from to, b from to) that if applied to a would transform it into b. This is explained in the Python difflib docs.