Now that the `git_diff_foreach` function does not depend on internals of
the `git_patch_generated` structure anymore, we can easily move it to
the actual diff code.
Now that `git_diff_delta` data can be produced by reading patch
file data, which may have an abbreviated oid, allow consumers to
know that the id is abbreviated.
When determining diffs between two iterators we may need to
recurse into an unmatched directory for the "new" iterator when
it is either a prefix to the current item of the "old" iterator
or when untracked/ignored changes are requested by the user and
the directory is untracked/ignored.
When advancing into the directory and no files are found, we will
get back `GIT_ENOTFOUND`. If so, we simply skip the directory,
handling resulting unmatched old items in the next iteration. The
other case of `iterator_advance_into` returning either
`GIT_NOERROR` or any other error but `GIT_ENOTFOUND` will be
handled by the caller, which will now either compare the first
directory entry of the "new" iterator in case of `GIT_ENOERROR`
or abort on other cases.
Improve readability of the code to make the above logic more
clear.
Drop some of the layers of indirection between the workdir and the
filesystem iterators. This makes the code a little bit easier to
follow, and reduces the number of unnecessary allocations a bit as
well. (Prior to this, when we filter entries, we would allocate them,
filter them and then free them; now we do the filtering before
allocation.)
Also, rename `git_iterator_advance_over_with_status` to just
`git_iterator_advance_over`. Mostly because it's a fucking long-ass
function name otherwise.
When formatting a patch as email we do not include the commit's
message in the formatted patch output. Implement this and add a
test that verifies behavior.
When examining the working directory and determining whether it's
up-to-date, only consider the nanoseconds in the index entry when
built with `GIT_USE_NSEC`. This prevents us from believing that
the working directory is always dirty when the index was originally
written with a git client that uinderstands nsecs (like git 2.x).
Although our index contains the literal time present in the index,
we do not read nanoseconds from disk, and thus we should not use
them in any comparisons, lest we always think our working directory
is dirty.
Guard this behind a `GIT_USE_NSECS` for future improvement.
When we're not doing pathspec matching, we let the iterator handle
file matching for us. However, we can only trust the iterator to
return *files* that match the pattern, because the iterator must
return directories that are not strictly in the pathlist, but that
are the parents of files that match the pattern, so that diff can
later recurse into them.
Thus, diff must examine non-files explicitly before including them
in the delta list.
When using literal pathspecs in diff with `GIT_DIFF_DISABLE_PATHSPEC_MATCH`
turn on the faster iterator pathlist handling.
Updates iterator pathspecs to include directory prefixes (eg, `foo/`)
for compatibility with `GIT_DIFF_DISABLE_PATHSPEC_MATCH`.
When diffing the index with the workdir and GIT_DIFF_UPDATE_INDEX has been passed,
the previous implementation was always writing the index to disk even if it wasn't
modified.
If an index entry for a file that is not in HEAD is in conflicted state,
when diffing HEAD with the index, the status field of the corresponding git_diff_delta was incorrectly reported as GIT_DELTA_ADDED instead of GIT_DELTA_CONFLICTED.
This was due to handle_unmatched_new_item() initially setting the status
to GIT_DELTA_CONFLICTED but then overriding it later with GIT_DELTA_ADDED.
When a file on the workdir has the same or a newer timestamp than the
index, we need to perform a full check of the contents, as the update of
the file may have happened just after we wrote the index.
The iterator changes are such that we can reach inside the workdir
iterator from the diff, though it may be better to have an accessor
instead of moving these structs into the header.
When updating the index during a diff, preserve the original mode,
which prevents us from dropping the mode to what we have interpreted
as on our system (eg, what the working directory claims it to be,
which may be a lie on some systems.)
Mark the `old_file` and `new_file` sides of a delta with a new bit,
`GIT_DIFF_FLAG_EXISTS`, that introduces that a particular side of
the delta exists in the diff.
This is useful for indicating whether a working directory item exists
or not, in the presence of a conflict. Diff users may have previously
used DELETED to determine this information.
It's not always obvious the mapping between stage level and
conflict-ness. More importantly, this can lead otherwise sane
people to write constructs like `if (!git_index_entry_stage(entry))`,
which (while technically correct) is unreadable.
Provide a nice method to help avoid such messy thinking.
Since a diff entry only concerns a single entry, zero the information
for the index side of a conflict. (The index entry would otherwise
erroneously include the lowest-stage index entry - generally the
ancestor of a conflict.)
Test that during status, the index side of the conflict is empty.
When diffing against an index, return a new `GIT_DELTA_CONFLICTED`
delta type for items that are conflicted. For a single file path,
only one delta will be produced (despite the fact that there are
multiple entries in the index).
Index iterators now have the (optional) ability to return conflicts
in the index. Prior to this change, they would be omitted, and callers
(like diff) would omit conflicted index entries entirely.
Wrap the iterator current / advance functions so that we can extend
them, but also handle GIT_ITEROVER cases in the iterator funcs
instead of the callers.
When checking out with a case-insensitive working directory, we
want to change the case of items in the working directory to
reflect changes that occured in the checkout target. Diff now
has an option to break case-changing renames into delete/add.
In the prior implementation, enabling GIT_DIFF_UPDATE_INDEX would overwrite
entries in the index with the ones generated from scanning the working if the
OID was the same.
Because this OID comparison ignores file modes, this means an file in the
workdir with only an exec bit difference with the one in the index would end
up being overwritten, resulting in the exec bit being loss. There might be
other related bugs but the fix of comparing OIDs and file modes should
address them all.
This changes the get_entry() method to return a refcounted version of
the config entry, which you have to free when you're done.
This allows us to avoid freeing the memory in which the entry is stored
on a refresh, which may happen at any time for a live config.
For this reason, get_string() has been forbidden on live configs and a
new function get_string_buf() has been added, which stores the string in
a git_buf which the user then owns.
The functions which parse the string value takea advantage of the
borrowing to parse safely and then release the entry.
Make our overflow checking look more like gcc and clang's, so that
we can substitute it out with the compiler instrinsics on platforms
that support it. This means dropping the ability to pass `NULL` as
an out parameter.
As a result, the macros also get updated to reflect this as well.
We cannot know from looking at .gitmodules whether a directory is a
submodule or not. We need the index or tree we are comparing against to
tell us. Otherwise we have to assume the entry in .gitmodules is stale
or otherwise invalid.
Thus we pass the index of the repository into the workdir iterator, even
if we do not want to compare against it. This follows what git does,
which even for `git diff <tree>`, it will consider staged submodules as
such.
