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Add the section headers/hunk headers we introduced in the previous
commits to the outer diff's hunk headers. This makes it easier to
understand which change we are actually looking at. For example an
outer hunk header might now look like:
@@ Documentation/config/interactive.txt
while previously it would have only been
@@
which doesn't give a lot of context for the change that follows.
For completeness also add section headers for the commit metadata and
the commit message, although they are arguably less important.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In a range-diff it's not always clear which file a certain funcname of
the inner diff belongs to, because the diff header (or section header
as added in a previous commit) is not always visible in the
range-diff.
Add the filename to the inner diffs header, so it's always visible to
users.
This also allows us to add the filename + the funcname to the outer
diffs hunk headers using a custom userdiff pattern, which will be done
in the next commit.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently range-diff keeps the diff header of the inner diff
intact (apart from stripping lines starting with index). This diff
header is somewhat useful, especially when files get different
names in different ranges.
However there is no real need to keep the whole diff header for that.
The main reason we currently do that is probably because it is easy to
do.
Introduce a new range diff hunk header, that's enclosed by "##",
similar to how line numbers in diff hunks are enclosed by "@@", and
give human readable information of what exactly happened to the file,
including the file name.
This improves the readability of the range-diff by giving more concise
information to the users. For example if a file was renamed in one
iteration, but not in another, the diff of the headers would be quite
noisy. However the diff of a single line is concise and should be
easier to understand.
Additionally, this allows us to add these range diff section headers to
the outer diffs hunk headers using a custom userdiff pattern, which
should help making the range-diff more readable.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The line count in the outer diff's hunk headers of a range diff is not
all that interesting. It merely shows how far along the inner diff
are on both sides. That number is of no use for human readers, and
range-diffs are not meant to be machine readable.
In a subsequent commit we're going to add some more contextual
information such as the filename corresponding to the diff to the hunk
headers. Remove the unnecessary information, and just keep the "@@"
to indicate that a new hunk of the outer diff is starting.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When postprocessing the inner diff in range-diff, we currently replace
the whole hunk header line with just "@@". This matches how 'git
tbdiff' used to handle hunk headers as well.
Most likely this is being done because line numbers in the hunk header
are not relevant without other changes. They can for example easily
change if a range is rebased, and lines are added/removed before a
change that we actually care about in our ranges.
However it can still be useful to have the function name that 'git
diff' extracts as additional context for the change.
Note that it is not guaranteed that the hunk header actually shows up
in the range-diff, and this change only aims to improve the case where
a hunk header would already be included in the final output.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Commit d8981c3f88 ("format-patch: do not let its diff-options affect
--range-diff", 2018-11-30) taught `show_range_diff()` to accept a
NULL-pointer as an indication that it should use its own "reasonable
default". That fixed a regression from a5170794 ("Merge branch
'ab/range-diff-no-patch'", 2018-11-18), but unfortunately it introduced
a regression of its own.
In particular, it means we forget the `file` member of the diff options,
so rather than placing a range-diff in the cover-letter, we write it to
stdout. In order to fix this, rewrite the two callers adjusted by
d8981c3f88 to instead create a "dummy" set of diff options where they
only fill in the fields we absolutely require, such as output file and
color.
Modify and extend the existing tests to try and verify that the right
contents end up in the right place.
Don't revert `show_range_diff()`, i.e., let it keep accepting NULL.
Rather than removing what is dead code and figuring out it isn't
actually dead and we've broken 2.20, just leave it for now.
[es: retain diff coloring when going to stdout]
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The "--no-patch" option, which can be used to get a high-level
overview without the actual line-by-line patch difference shown, of
the "range-diff" command was earlier broken, which has been
corrected.
* ab/range-diff-no-patch:
range-diff: make diff option behavior (e.g. --stat) consistent
range-diff: fix regression in passing along diff options
range-diff doc: add a section about output stability
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Make the behavior when diff options (e.g. "--stat") are passed
consistent with how "diff" behaves.
Before 73a834e9e2 ("range-diff: relieve callers of low-level
configuration burden", 2018-07-22) running range-diff with "--stat"
would produce stat output and the diff output, as opposed to how
"diff" behaves where once "--stat" is specified "--patch" also needs
to be provided to emit the patch output.
As noted in a previous change ("range-diff doc: add a section about
output stability", 2018-11-07) the "--stat" output with "range-diff"
is useless at the moment.
But we should behave consistently with "diff" in anticipation of such
output being useful in the future, because it would make for confusing
UI if "diff" and "range-diff" behaved differently when it came to how
they interpret diff options.
The new behavior is also consistent with the existing documentation
added in ba931edd28 ("range-diff: populate the man page",
2018-08-13). See "[...]also accepts the regular diff options[...]" in
git-range-diff(1).
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In 73a834e9e2 ("range-diff: relieve callers of low-level configuration
burden", 2018-07-22) we broke passing down options like --no-patch,
--stat etc.
Fix that regression, and add a test asserting the pre-73a834e9e2
behavior for some of these diff options.
As noted in a change leading up to this ("range-diff doc: add a
section about output stability", 2018-11-07) the output is not meant
to be stable. So this regression test will likely need to be tweaked
once we get a "proper" --stat option.
See
https://public-inbox.org/git/nycvar.QRO.7.76.6.1811071202480.39@tvgsbejvaqbjf.bet/
for a further explanation of the regression. The fix here is not the
same as in Johannes's on-list patch, for reasons that'll be explained
in a follow-up commit.
The quoting of "EOF" here mirrors that of an earlier test. Perhaps
that should be fixed, but let's leave that up to a later cleanup
change.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If we have `submodule.diff = log' in the configuration file
or `--submodule=log' is given as argument, range-diff fails
to compare both diffs and we only get the following output:
Submodule a 0000000...0000000 (new submodule)
Even if the repository doesn't have any submodule.
That's because the mode in diff_filespec is not correct and when
flushing the diff, down in builtin_diff() we will enter the condition:
if (o->submodule_format == DIFF_SUBMODULE_LOG &&
(!one->mode || S_ISGITLINK(one->mode)) &&
(!two->mode || S_ISGITLINK(two->mode))) {
show_submodule_summary(o, one->path ? one->path : two->path,
&one->oid, &two->oid,
two->dirty_submodule);
return;
It turns out that S_ISGITLINK will return true (mode == 0160000 here).
Similar thing happens if submodule.diff is "diff".
Do like it's done in grep.c when calling fill_filespec() and force it to
be recognized as a file by adding S_IFREG to the mode.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Recently added "range-diff" had a corner-case bug to cause it
segfault, which has been corrected.
* tg/range-diff-corner-case-fix:
linear-assignment: fix potential out of bounds memory access
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* ds/format-patch-range-diff-test:
t3206-range-diff.sh: cover single-patch case
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"git format-patch" learned a new "--range-diff" option to explain
the difference between this version and the previous attempt in
the cover letter (or after the tree-dashes as a comment).
* es/format-patch-rangediff:
format-patch: allow --range-diff to apply to a lone-patch
format-patch: add --creation-factor tweak for --range-diff
format-patch: teach --range-diff to respect -v/--reroll-count
format-patch: extend --range-diff to accept revision range
format-patch: add --range-diff option to embed diff in cover letter
range-diff: relieve callers of low-level configuration burden
range-diff: publish default creation factor
range-diff: respect diff_option.file rather than assuming 'stdout'
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Currently the 'compute_assignment()' function may read memory out
of bounds, even if used correctly. Namely this happens when we only
have one column. In that case we try to calculate the initial
minimum cost using '!j1' as column in the reduction transfer code.
That in turn causes us to try and get the cost from column 1 in the
cost matrix, which does not exist, and thus results in an out of
bounds memory read.
In the original paper [1], the example code initializes that minimum
cost to "infinite". We could emulate something similar by setting the
minimum cost to INT_MAX, which would result in the same minimum cost
as the current algorithm, as we'd always go into the if condition at
least once, except when we only have one column, and column_count thus
equals 1.
If column_count does equal 1, the condition in the loop would always
be false, and we'd end up with a minimum of INT_MAX, which may lead to
integer overflows later in the algorithm.
For a column count of 1, we however do not even really need to go
through the whole algorithm. A column count of 1 means that there's
no possible assignments, and we can just zero out the column2row and
row2column arrays, and return early from the function, while keeping
the reduction transfer part of the function the same as it is
currently.
Another solution would be to just not call the 'compute_assignment()'
function from the range diff code in this case, however it's better to
make the compute_assignment function more robust, so future callers
don't run into this potential problem.
Note that the test only fails under valgrind on Linux, but the same
command has been reported to segfault on Mac OS.
[1]: Jonker, R., & Volgenant, A. (1987). A shortest augmenting path
algorithm for dense and sparse linear assignment
problems. Computing, 38(4), 325–340.
Reported-by: ryenus <ryenus@gmail.com>
Helped-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The commit 40ce4160 "format-patch: allow --range-diff to apply to
a lone-patch" added the ability to see a range-diff as commentary
after the commit message of a single patch series (i.e. [PATCH]
instead of [PATCH X/N]). However, this functionality was not
covered by a test case.
Add a simple test case that checks that a range-diff is written as
commentary to the patch.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The range-diff coloring is a bit fuzzy when it comes to special lines of
a diff, such as indicating new and old files with +++ and ---, as it
would pickup the first character and interpret it for its coloring, which
seems annoying as in regular diffs, these lines are colored bold via
DIFF_METAINFO.
By indenting these lines by a white space, they will be treated as context
which is much more useful, an example [1] on the range diff series itself:
[...]
+ diff --git a/Documentation/git-range-diff.txt b/Documentation/git-range-diff.txt
+ new file mode 100644
+ --- /dev/null
+ +++ b/Documentation/git-range-diff.txt
+@@
++git-range-diff(1)
[...]
+
diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
[...]
The first lines that introduce the new file for the man page will have the
'+' sign colored and the rest of the line will be bold.
The later lines that indicate a change to the Makefile will be treated as
context both in the outer and inner diff, such that those lines stay
regular color.
[1] ./git-range-diff pr-1/dscho/branch-diff-v3...pr-1/dscho/branch-diff-v4
These tags are found at https://github.com/gitgitgadget/git
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When submitting a revised a patch series, the --range-diff option embeds
a range-diff in the cover letter showing changes since the previous
version of the patch series. The argument to --range-diff is a simple
revision naming the tip of the previous series, which works fine if the
previous and current versions of the patch series share a common base.
However, it fails if the revision ranges of the old and new versions of
the series are disjoint. To address this shortcoming, extend
--range-diff to also accept an explicit revision range for the previous
series. For example:
git format-patch --cover-letter --range-diff=v1~3..v1 -3 v2
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When submitting a revised version of a patch series, it can be helpful
(to reviewers) to include a summary of changes since the previous
attempt in the form of a range-diff, however, doing so involves manually
copy/pasting the diff into the cover letter.
Add a --range-diff option to automate this process. The argument to
--range-diff specifies the tip of the previous attempt against which to
generate the range-diff. For example:
git format-patch --cover-letter --range-diff=v1 -3 v2
(At this stage, the previous attempt and the patch series being
formatted must share a common base, however, a subsequent enhancement
will make it possible to specify an explicit revision range for the
previous attempt.)
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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All lines that use emit_line_0 multiple times per line, are combined
into a single call to emit_line_0, making use of the 'set' argument.
We gain a little efficiency here, as we can omit emission of color and
accompanying reset if 'len == 0'.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The 'expect'ed outcome has been taken by running the 'range-diff | decode'.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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These are essentially lifted from https://github.com/trast/tbdiff, with
light touch-ups to account for the command now being named `git
range-diff`.
Apart from renaming `tbdiff` to `range-diff`, only one test case needed
to be adjusted: 11 - 'changed message'.
The underlying reason it had to be adjusted is that diff generation is
sometimes ambiguous. In this case, a comment line and an empty line are
added, but it is ambiguous whether they were added after the existing
empty line, or whether an empty line and the comment line are added
*before* the existing empty line. And apparently xdiff picks a different
option here than Python's difflib.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Thomas Gummerer
Martin Ågren
Junio C Hamano
Ævar Arnfjörð Bjarmason
Lucas De Marchi
Derrick Stolee
Stefan Beller
Eric Sunshine
Thomas Rast