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When marshalling diff callback data to Go structs, any `char*` need to
be pre-emptively copied onto Go's heap as they're invalidated as soon as
our callback function returns. This patch adds this extra copy before
sending the value to the channel, which fixes a bug wherein
`DiffLine.Content`, `DiffFile.Path` and `DiffHunk.Header` would
previously return garbage data.
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It is possible that the typed enums from libgit2 should be exported as
distinct types rather than numeric constants (e.g, `git_delta_t` and
`git_line_t` should be typed), but this has not been done in this patch.
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This commit adds barebones capacity to generate diffs from two trees and
to emit those as git-style diffs (via `Patch.String`), or to enumerate
the files/hunks/lines in the diff to emit the data yourself.
The walk functions have been implemented in the same manner as the Odb
walking methods.
Note that not all of the functionality is implemented for either the
`git_diff_*` nor the `git_patch_*` functions, and there are unexposed
constants which would likely be useful to add.
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