A practical guide on building a custom `git diff` driver — an external command that git delegates diffing to. Covers the 7 arguments git passes to the external tool (filename, before/after paths, SHA-1 hashes, file modes), how special cases like file creation and deletion are handled using `/dev/null`, and includes a working bash script example using `oasdiff` to produce human-readable changelogs for OpenAPI spec diffs.
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