diff: provide more context to the consumer of the callbacks #652
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Update the diff callbacks to provide some information related to the file change being processed and the range of the hunk, when applicable.
The need for this fix has been identified by @yorah while implementing the Diff API in LibGit2Sharp (cf . libgit2/libgit2sharp#136).
Additionally, I've added a tiny accessor
git_buf_len()
which I've always missed.If you think it's inappropriate I'll gladly remove it from the PR and will keep on digging into the buffer code to find out if I'm supposed to use the
size
orasize
property :-)