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2014-02-23Export the constants and enumerations for diffs.lye
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.
2014-02-20Add partial diff/patch functionality.lye
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.