Reorganize the builtin driver table slightly so that core Git
builtin definitions can be imported verbatim. Then take a few of
the core Git drivers and pull them in.
This also creates a test of diffs with the builtin HTML driver
which led to some small error handling fixes in the driver
selection logic.
This extends the diff driver parser to support multiline driver
definitions along with ! prefixing for negated matches. This
brings the driver function pattern parsing in line with core Git.
This also adds an internal table of driver definitions and a
fallback code path that will look in that table for diff drivers
that are set with attributes without having a definition in the
config file. Right now, I just populated the table with a kind
of simple HTML definition that is similar to the core Git def.
Don't try to determine whether the system supports file modes
when putting the tree data in the index during checkout. The tree's
mode is canonical and did not come from stat(2) in the first place.
It's hard or even impossible to correctly free the string buffer
allocated by git_patch_to_str in some circumstances. Drop the function
so people have to use git_patch_to_buf instead - git_buf has a dedicated
destructor.
Returning library-allocated strings from libgit2 works fine on Linux,
but may cause problems on Windows because there is no one C Runtime that
everything links against. With libgit2 not exposing its own allocator,
freeing the string is a gamble.
git_patch_to_str already serializes to a buffer, then returns the
underlying memory. Expose the functionality directly, so callers can use
the git_buf_free function to free the memory later.
The "merge none" (don't automerge) flag was only to aide in
merge trivial tests. We can easily determine whether merge
trivial resulted in a trivial merge or an automerge by examining
the REUC after automerge has completed.
The default merge_file level was XDL_MERGE_MINIMAL, which will
produce conflicts where there should not be in the case where
both sides were changed identically. Change the defaults to be
more aggressive (XDL_MERGE_ZEALOUS) which will more aggressively
compress non-conflicts. This matches git.git's defaults.
Increase testing around reverting a previously reverted commit to
illustrate this problem.
Extend the "unmodified" submodule workdir test to include
uninitialized submodules, to prevent reporting submodules as
modified when they're not in the workdir at all.
Any well-behaved program should write a descriptive message to the
reflog whenever it updates a reference. Let's make this more prominent
by removing the version without the reflog parameters.
