Commit Graph

128 Commits

Author SHA1 Message Date
Junio C Hamano
6ca224f156 Merge branch 'dl/diff-merge-base'
"git diff --merge-base" documentation has been updated.

* dl/diff-merge-base:
  git-diff: fix missing --merge-base docs
2021-07-28 13:17:59 -07:00
Denton Liu
eb448631fb git-diff: fix missing --merge-base docs
When `git diff --merge-base` was introduced at around Git 2.30, the
documentation included a few errors.

In the example given for `git diff --cached --merge-base`, the
`--cached` flag was omitted for the `--merge-base` example. Add the
missing flag.

In the `git diff <commit>` case, we failed to mention that
`--merge-base` is an available option. Give the usage of `--merge-base`
as an option there.

Finally, there are two errors in the usage of `git diff`. Firstly, we do
not mention `--merge-base` in the `git diff --cached` case. Mention it
so that it's consistent with the documentation. Secondly, we put the
`[--merge-base]` in between `<commit>` and `[<commit>...]`. Move the
`[--merge-base]` so that it's beside `[<options>]` which is a more
logical grouping.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-07-12 13:55:29 -07:00
brian m. carlson
14228447c9 hash: provide per-algorithm null OIDs
Up until recently, object IDs did not have an algorithm member, only a
hash.  Consequently, it was possible to share one null (all-zeros)
object ID among all hash algorithms.  Now that we're going to be
handling objects from multiple hash algorithms, it's important to make
sure that all object IDs have a correct algorithm field.

Introduce a per-algorithm null OID, and add it to struct hash_algo.
Introduce a wrapper function as well, and use it everywhere we used to
use the null_oid constant.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-27 16:31:39 +09:00
Junio C Hamano
845d6030f8 Merge branch 'jc/diffcore-rotate'
"git {diff,log} --{skip,rotate}-to=<path>" allows the user to
discard diff output for early paths or move them to the end of the
output.

* jc/diffcore-rotate:
  diff: --{rotate,skip}-to=<path>
2021-02-25 16:43:30 -08:00
Junio C Hamano
1eb4136ac2 diff: --{rotate,skip}-to=<path>
In the implementation of "git difftool", there is a case where the
user wants to start viewing the diffs at a specific path and
continue on to the rest, optionally wrapping around to the
beginning.  Since it is somewhat cumbersome to implement such a
feature as a post-processing step of "git diff" output, let's
support it internally with two new options.

 - "git diff --rotate-to=C", when the resulting patch would show
   paths A B C D E without the option, would "rotate" the paths to
   shows patch to C D E A B instead.  It is an error when there is
   no patch for C is shown.

 - "git diff --skip-to=C" would instead "skip" the paths before C,
   and shows patch to C D E.  Again, it is an error when there is no
   patch for C is shown.

 - "git log [-p]" also accepts these two options, but it is not an
   error if there is no change to the specified path.  Instead, the
   set of output paths are rotated or skipped to the specified path
   or the first path that sorts after the specified path.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-16 09:30:42 -08:00
Junio C Hamano
8b25dee615 Merge branch 'tb/precompose-prefix-too'
When commands are started from a subdirectory, they may have to
compare the path to the subdirectory (called prefix and found out
from $(pwd)) with the tracked paths.  On macOS, $(pwd) and
readdir() yield decomposed path, while the tracked paths are
usually normalized to the precomposed form, causing mismatch.  This
has been fixed by taking the same approach used to normalize the
command line arguments.

* tb/precompose-prefix-too:
  MacOS: precompose_argv_prefix()
2021-02-12 14:21:04 -08:00
Junio C Hamano
aac006aa99 Merge branch 'so/log-diff-merge'
"git log" learned a new "--diff-merges=<how>" option.

* so/log-diff-merge: (32 commits)
  t4013: add tests for --diff-merges=first-parent
  doc/git-show: include --diff-merges description
  doc/rev-list-options: document --first-parent changes merges format
  doc/diff-generate-patch: mention new --diff-merges option
  doc/git-log: describe new --diff-merges options
  diff-merges: add '--diff-merges=1' as synonym for 'first-parent'
  diff-merges: add old mnemonic counterparts to --diff-merges
  diff-merges: let new options enable diff without -p
  diff-merges: do not imply -p for new options
  diff-merges: implement new values for --diff-merges
  diff-merges: make -m/-c/--cc explicitly mutually exclusive
  diff-merges: refactor opt settings into separate functions
  diff-merges: get rid of now empty diff_merges_init_revs()
  diff-merges: group diff-merge flags next to each other inside 'rev_info'
  diff-merges: split 'ignore_merges' field
  diff-merges: fix -m to properly override -c/--cc
  t4013: add tests for -m failing to override -c/--cc
  t4013: support test_expect_failure through ':failure' magic
  diff-merges: revise revs->diff flag handling
  diff-merges: handle imply -p on -c/--cc logic for log.c
  ...
2021-02-05 16:40:44 -08:00
Torsten Bögershausen
5c327502db MacOS: precompose_argv_prefix()
The following sequence leads to a "BUG" assertion running under MacOS:

  DIR=git-test-restore-p
  Adiarnfd=$(printf 'A\314\210')
  DIRNAME=xx${Adiarnfd}yy
  mkdir $DIR &&
  cd $DIR &&
  git init &&
  mkdir $DIRNAME &&
  cd $DIRNAME &&
  echo "Initial" >file &&
  git add file &&
  echo "One more line" >>file &&
  echo y | git restore -p .

 Initialized empty Git repository in /tmp/git-test-restore-p/.git/
 BUG: pathspec.c:495: error initializing pathspec_item
 Cannot close git diff-index --cached --numstat
 [snip]

The command `git restore` is run from a directory inside a Git repo.
Git needs to split the $CWD into 2 parts:
The path to the repo and "the rest", if any.
"The rest" becomes a "prefix" later used inside the pathspec code.

As an example, "/path/to/repo/dir-inside-repå" would determine
"/path/to/repo" as the root of the repo, the place where the
configuration file .git/config is found.

The rest becomes the prefix ("dir-inside-repå"), from where the
pathspec machinery expands the ".", more about this later.
If there is a decomposed form, (making the decomposing visible like this),
"dir-inside-rep°a" doesn't match "dir-inside-repå".

Git commands need to:

 (a) read the configuration variable "core.precomposeunicode"
 (b) precocompose argv[]
 (c) precompose the prefix, if there was any

The first commit,
76759c7dff "git on Mac OS and precomposed unicode"
addressed (a) and (b).

The call to precompose_argv() was added into parse-options.c,
because that seemed to be a good place when the patch was written.

Commands that don't use parse-options need to do (a) and (b) themselfs.

The commands `diff-files`, `diff-index`, `diff-tree` and `diff`
learned (a) and (b) in
commit 90a78b83e0 "diff: run arguments through precompose_argv"

Branch names (or refs in general) using decomposed code points
resulting in decomposed file names had been fixed in
commit 8e712ef6fc "Honor core.precomposeUnicode in more places"

The bug report from above shows 2 things:
- more commands need to handle precomposed unicode
- (c) should be implemented for all commands using pathspecs

Solution:
precompose_argv() now handles the prefix (if needed), and is renamed into
precompose_argv_prefix().

Inside this function the config variable core.precomposeunicode is read
into the global variable precomposed_unicode, as before.
This reading is skipped if precomposed_unicode had been read before.

The original patch for preocomposed unicode, 76759c7dff, placed
precompose_argv() into parse-options.c

Now add it into git.c::run_builtin() as well.  Existing precompose
calls in diff-files.c and others may become redundant, and if we
audit the callflows that reach these places to make sure that they
can never be reached without going through the new call added to
run_builtin(), we might be able to remove these existing ones.

But in this commit, we do not bother to do so and leave these
precompose callsites as they are.  Because precompose() is
idempotent and can be called on an already precomposed string
safely, this is safer than removing existing calls without fully
vetting the callflows.

There is certainly room for cleanups - this change intends to be a bug fix.
Cleanups needs more tests in e.g. t/t3910-mac-os-precompose.sh, and should
be done in future commits.

[1] git-bugreport-2021-01-06-1209.txt (git can't deal with special characters)
[2] https://lore.kernel.org/git/A102844A-9501-4A86-854D-E3B387D378AA@icloud.com/

Reported-by: Daniel Troger <random_n0body@icloud.com>
Helped-By: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-02-03 14:09:37 -08:00
Sergey Organov
3b6c17b5c0 diff-merges: new function diff_merges_set_dense_combined_if_unset()
Call it where given functionality is needed instead of direct
checking/tweaking of diff merges related fields.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-12-21 13:47:31 -08:00
Junio C Hamano
b6fb70c985 Merge branch 'dl/diff-merge-base'
"git diff A...B" learned "git diff --merge-base A B", which is a
longer short-hand to say the same thing.

* dl/diff-merge-base:
  contrib/completion: complete `git diff --merge-base`
  builtin/diff-tree: learn --merge-base
  builtin/diff-index: learn --merge-base
  t4068: add --merge-base tests
  diff-lib: define diff_get_merge_base()
  diff-lib: accept option flags in run_diff_index()
  contrib/completion: extract common diff/difftool options
  git-diff.txt: backtick quote command text
  git-diff-index.txt: make --cached description a proper sentence
  t4068: remove unnecessary >tmp
2020-11-02 13:17:39 -08:00
Sergey Organov
d01141de5a diff: get rid of redundant 'dense' argument
Get rid of 'dense' argument that is redundant for every function that has
'struct rev_info *rev' argument as well, as the value of 'dense' passed is
always taken from 'rev->dense_combined_merges' field.

The only place where this was not the case is in 'submodule.c' where
'diff_tree_combined_merge()' was called with '1' for 'dense' argument. However,
at that call the 'revs' instance used is local to the function, and we now just
set 'revs->dense_combined_merges' to 1 in this local instance.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-09-29 11:54:53 -07:00
Denton Liu
3d09c22869 builtin/diff-tree: learn --merge-base
The previous commit introduced ---merge-base a way to take the diff
between the working tree or index and the merge base between an arbitrary
commit and HEAD. It makes sense to extend this option to support the
case where two commits are given too and behave in a manner identical to
`git diff A...B`.

Introduce the --merge-base flag as an alternative to triple-dot
notation. Thus, we would be able to write the above as
`git diff --merge-base A B`.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-09-21 13:37:03 -07:00
Denton Liu
0f5a1d449b builtin/diff-index: learn --merge-base
There is currently no easy way to take the diff between the working tree
or index and the merge base between an arbitrary commit and HEAD. Even
diff's `...` notation doesn't allow this because it only works between
commits. However, the ability to do this would be desirable to a user
who would like to see all the changes they've made on a branch plus
uncommitted changes without taking into account changes made in the
upstream branch.

Teach diff-index and diff (with one commit) the --merge-base option
which allows a user to use the merge base of a commit and HEAD as the
"before" side.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-09-20 21:30:26 -07:00
Denton Liu
4c3fe82ef1 diff-lib: accept option flags in run_diff_index()
In a future commit, we will teach run_diff_index() to accept more
options via flag bits. For now, change `cached` into a flag in the
`option` bitfield. The behaviour should remain exactly the same.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-09-20 21:30:26 -07:00
Junio C Hamano
46be023084 Merge branch 'ct/diff-with-merge-base-clarification' into master
Recent update to "git diff" meant as a code clean-up introduced a
bug in its error handling code, which has been corrected.

* ct/diff-with-merge-base-clarification:
  diff: check for merge bases before assigning sym->base
2020-07-09 14:00:43 -07:00
Jeff King
5f46e610cb diff: check for merge bases before assigning sym->base
In symdiff_prepare(), we iterate over the set of parsed objects to pick
out any symmetric differences, including the left, right, and base
elements. We assign the results into pointers in a "struct symdiff", and
then complain if we didn't find a base, like so:

    sym->left = rev->pending.objects[lpos].name;
    sym->right = rev->pending.objects[rpos].name;
    sym->base = rev->pending.objects[basepos].name;
    if (basecount == 0)
            die(_("%s...%s: no merge base"), sym->left, sym->right);

But the least lines are backwards. If basecount is 0, then basepos will
be -1, and we will access memory outside of the pending array. This
isn't usually that big a deal, since we don't do anything besides a
single pointer-sized read before exiting anyway, but it does violate the
C standard, and of course memory-checking tools like ASan complain.

Let's put the basecount check first. Note that we haveto split it from
the other assignments, since the die() relies on sym->left and
sym->right having been assigned (this isn't strictly necessary, but is
easier to read than dereferencing the pending array again).

Reported-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-07-08 13:57:18 -07:00
Junio C Hamano
1ea1f93fd9 Merge branch 'dl/diff-usage-comment-update'
An in-code comment in "git diff" has been updated.

* dl/diff-usage-comment-update:
  builtin/diff: fix botched update of usage comment
  builtin/diff: update usage comment
2020-06-29 14:17:25 -07:00
Junio C Hamano
1457886ce2 Merge branch 'ct/diff-with-merge-base-clarification'
"git diff" used to take arguments in random and nonsense range
notation, e.g. "git diff A..B C", "git diff A..B C...D", etc.,
which has been cleaned up.

* ct/diff-with-merge-base-clarification:
  Documentation: usage for diff combined commits
  git diff: improve range handling
  t/t3430: avoid undefined git diff behavior
2020-06-25 12:27:46 -07:00
Denton Liu
c592fd4c83 builtin/diff: fix botched update of usage comment
In the previous commit, an attempt was made to correct the "N=1, M=0"
case. However, the fix was botched and it introduced two half-correct
sections by mistake. Combine these half-correct sections into one fully
correct section.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-23 16:39:41 -07:00
Denton Liu
a9d7689cd4 builtin/diff: update usage comment
A comment in cmd_diff() states that if one tree-ish and no blobs are
provided, (the "N=1, M=0" case), it will provide a diff between the tree
and the cache. This is incorrect because a diff happens between the
tree-ish and the working tree. Remove the `--cached` in the comment so
that the correct behavior is shown. Add a new section describing the
"N=1, M=0, --cached" behavior.

Next, describe the "N=0, M=0, --cached" case, similar to the above since
it is undocumented.

Finally, fix some spacing issues. Add spaces between each section for
consistency and readability. Also, change tabs within the comment into
spaces.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-18 15:01:15 -07:00
Chris Torek
b7e10b2ca2 Documentation: usage for diff combined commits
Document the usage for producing combined commits with "git diff".
This includes updating the synopsis section.

While here, add the three-dot notation to the synopsis.

Make "git diff -h" print the same usage summary as the manual
page synopsis, minus the "A..B" form, which is now discouraged.

Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 10:53:44 -07:00
Chris Torek
8bfcb3a690 git diff: improve range handling
When git diff is given a symmetric difference A...B, it chooses
some merge base from the two specified commits (as documented).

This fails, however, if there is *no* merge base: instead, you
see the differences between A and B, which is certainly not what
is expected.

Moreover, if additional revisions are specified on the command
line ("git diff A...B C"), the results get a bit weird:

 * If there is a symmetric difference merge base, this is used
   as the left side of the diff.  The last final ref is used as
   the right side.
 * If there is no merge base, the symmetric status is completely
   lost.  We will produce a combined diff instead.

Similar weirdness occurs if you use, e.g., "git diff C A...B D".
Likewise, using multiple two-dot ranges, or tossing extra
revision specifiers into the command line with two-dot ranges,
or mixing two and three dot ranges, all produce nonsense.

To avoid all this, add a routine to catch the range cases and
verify that that the arguments make sense.  As a side effect,
produce a warning showing *which* merge base is being used when
there are multiple choices; die if there is no merge base.

Signed-off-by: Chris Torek <chris.torek@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-06-12 10:53:44 -07:00
Jeff King
fe299ec5ae oid_array: rename source file from sha1-array
We renamed the actual data structure in 910650d2f8 (Rename sha1_array to
oid_array, 2017-03-31), but the file is still called sha1-array. Besides
being slightly confusing, it makes it more annoying to grep for leftover
occurrences of "sha1" in various files, because the header is included
in so many places.

Let's complete the transition by renaming the source and header files
(and fixing up a few comment references).

I kept the "-" in the name, as that seems to be our style; cf.
fc1395f4a4 (sha1_file.c: rename to use dash in file name, 2018-04-10).
We also have oidmap.h and oidset.h without any punctuation, but those
are "struct oidmap" and "struct oidset" in the code. We _could_ make
this "oidarray" to match, but somehow it looks uglier to me because of
the length of "array" (plus it would be a very invasive patch for little
gain).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-03-30 10:59:08 -07:00
Junio C Hamano
dcd6a8c09a Merge branch 'nd/diff-parseopt-4'
Fourth batch to teach the diff machinery to use the parse-options
API.

* nd/diff-parseopt-4:
  am: avoid diff_opt_parse()
  diff --no-index: use parse_options() instead of diff_opt_parse()
  range-diff: use parse_options() instead of diff_opt_parse()
  diff.c: allow --no-color-moved-ws
  diff-parseopt: convert --color-moved-ws
  diff-parseopt: convert --[no-]color-moved
  diff-parseopt: convert --inter-hunk-context
  diff-parseopt: convert --no-prefix
  diff-parseopt: convert --line-prefix
  diff-parseopt: convert --[src|dst]-prefix
  diff-parseopt: convert --[no-]abbrev
  diff-parseopt: convert --diff-filter
  diff-parseopt: convert --find-object
  diff-parseopt: convert -O
  diff-parseopt: convert --pickaxe-all|--pickaxe-regex
  diff-parseopt: convert -S|-G
  diff-parseopt: convert -l
  diff-parseopt: convert -z
  diff-parseopt: convert --ita-[in]visible-in-index
  diff-parseopt: convert --ws-error-highlight
2019-04-25 16:41:12 +09:00
Nguyễn Thái Ngọc Duy
16bb3d714d diff --no-index: use parse_options() instead of diff_opt_parse()
While at there, move exit() back to the caller. It's easier to see the
flow that way than burying it in diff-no-index.c

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-03-24 22:21:24 +09:00
Junio C Hamano
12e5bdd9c4 Merge branch 'jk/diff-no-index-initialize'
"git diff --no-index" may still want to access Git goodies like
--ext-diff and --textconv, but so far these have been ignored,
which has been corrected.

* jk/diff-no-index-initialize:
  diff: reuse diff setup for --no-index case
2019-03-07 09:59:59 +09:00
Jeff King
287ab28bfa diff: reuse diff setup for --no-index case
When "--no-index" is in effect (or implied by the arguments), git-diff
jumps early to a special code path to perform that diff. This means we
miss out on some settings like enabling --ext-diff and --textconv by
default.

Let's jump to the no-index path _after_ we've done more setup on
rev.diffopt. Since some of the options don't affect us (e.g., items
related to the index), let's re-order the setup into two blocks (see the
in-code comments).

Note that we also need to stop re-initializing the diffopt struct in
diff_no_index(). This should not be necessary, as it will already have
been initialized by cmd_diff() (and there are no other callers). That in
turn lets us drop the "repository" argument from diff_no_index (which
never made much sense, since the whole point is that you don't need a
repository).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-24 07:08:34 -08:00
Junio C Hamano
3a14fdec88 Merge branch 'sl/const'
Code cleanup.

* sl/const:
  various: tighten constness of some local variables
2019-02-06 22:05:28 -08:00
Shahzad Lone
33de80b1d5 various: tighten constness of some local variables
Signed-off-by: Shahzad Lone <shahzadlone@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-04 09:57:10 -08:00
Nguyễn Thái Ngọc Duy
f8adbec9fe cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch
By default, index compat macros are off from now on, because they
could hide the_index dependency.

Only those in builtin can use it.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-01-24 11:55:06 -08:00
Nguyễn Thái Ngọc Duy
1b0d968b34 read-cache.c: replace update_index_if_able with repo_&
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-01-14 12:13:04 -08:00
Junio C Hamano
11877b9ebe Merge branch 'nd/the-index'
Various codepaths in the core-ish part learn to work on an
arbitrary in-core index structure, not necessarily the default
instance "the_index".

* nd/the-index: (23 commits)
  revision.c: reduce implicit dependency the_repository
  revision.c: remove implicit dependency on the_index
  ws.c: remove implicit dependency on the_index
  tree-diff.c: remove implicit dependency on the_index
  submodule.c: remove implicit dependency on the_index
  line-range.c: remove implicit dependency on the_index
  userdiff.c: remove implicit dependency on the_index
  rerere.c: remove implicit dependency on the_index
  sha1-file.c: remove implicit dependency on the_index
  patch-ids.c: remove implicit dependency on the_index
  merge.c: remove implicit dependency on the_index
  merge-blobs.c: remove implicit dependency on the_index
  ll-merge.c: remove implicit dependency on the_index
  diff-lib.c: remove implicit dependency on the_index
  read-cache.c: remove implicit dependency on the_index
  diff.c: remove implicit dependency on the_index
  grep.c: remove implicit dependency on the_index
  diff.c: remove the_index dependency in textconv() functions
  blame.c: rename "repo" argument to "r"
  combine-diff.c: remove implicit dependency on the_index
  ...
2018-10-19 13:34:02 +09:00
Nguyễn Thái Ngọc Duy
2abf350385 revision.c: remove implicit dependency on the_index
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-21 09:51:19 -07:00
Nguyễn Thái Ngọc Duy
e675765235 diff.c: remove implicit dependency on the_index
A new variant repo_diff_setup() is added that takes 'struct repository *'
and diff_setup() becomes a thin macro around it that is protected by
NO_THE_REPOSITORY_COMPATIBILITY_MACROS, similar to NO_THE_INDEX_....
The plan is these macros will always be defined for all library files
and the macros are only accessible in builtin/

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-21 09:48:10 -07:00
Jeff King
4a7e27e957 convert "oidcmp() == 0" to oideq()
Using the more restrictive oideq() should, in the long run,
give the compiler more opportunities to optimize these
callsites. For now, this conversion should be a complete
noop with respect to the generated code.

The result is also perhaps a little more readable, as it
avoids the "zero is equal" idiom. Since it's so prevalent in
C, I think seasoned programmers tend not to even notice it
anymore, but it can sometimes make for awkward double
negations (e.g., we can drop a few !!oidcmp() instances
here).

This patch was generated almost entirely by the included
coccinelle patch. This mechanical conversion should be
completely safe, because we check explicitly for cases where
oidcmp() is compared to 0, which is what oideq() is doing
under the hood. Note that we don't have to catch "!oidcmp()"
separately; coccinelle's standard isomorphisms make sure the
two are treated equivalently.

I say "almost" because I did hand-edit the coccinelle output
to fix up a few style violations (it mostly keeps the
original formatting, but sometimes unwraps long lines).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-29 11:32:49 -07:00
Stefan Beller
a74093da5e tag: add repository argument to deref_tag
Add a repository argument to allow the callers of deref_tag
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29 10:43:39 -07:00
Stefan Beller
f86bcc7b2c tree: add repository argument to lookup_tree
Add a repository argument to allow the callers of lookup_tree
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29 10:43:38 -07:00
Stefan Beller
109cd76dd3 object: add repository argument to parse_object
Add a repository argument to allow the callers of parse_object
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29 10:43:38 -07:00
Junio C Hamano
ac997db0c1 Merge branch 'nd/diff-apply-ita'
"git diff" compares the index and the working tree.  For paths
added with intent-to-add bit, the command shows the full contents
of them as added, but the paths themselves were not marked as new
files.  They are now shown as new by default.

"git apply" learned the "--intent-to-add" option so that an
otherwise working-tree-only application of a patch will add new
paths to the index marked with the "intent-to-add" bit.

* nd/diff-apply-ita:
  apply: add --intent-to-add
  t2203: add a test about "diff HEAD" case
  diff: turn --ita-invisible-in-index on by default
  diff: ignore --ita-[in]visible-in-index when diffing worktree-to-tree
2018-06-25 13:22:36 -07:00
Nguyễn Thái Ngọc Duy
0231ae71d3 diff: turn --ita-invisible-in-index on by default
Due to the implementation detail of intent-to-add entries, the current
"git diff" (i.e. no treeish or --cached argument) would show the
changes in the i-t-a file, but it does not mark the file as new, while
"diff --cached" would mark the file as new while showing its content
as empty.

     $ git diff                     | $ diff --cached
    --------------------------------|-------------------------------
     diff --git a/new b/new         | diff --git a/new b/new
     index e69de29..5ad28e2 100644  | new file mode 100644
     --- a/new                      | index 0000000..e69de29
     +++ b/new                      |
     @@ -0,0 +1 @@                  |
     +haha                          |

One evidence of the current output being wrong is that, the output
from "git diff" (with ita entries) cannot be applied because it
assumes empty files exist before applying.

Turning on --ita-invisible-in-index [1] [2] would fix this. The result
is "new file" line moving from "git diff --cached" to "git diff".

     $ git diff                     | $ diff --cached
    --------------------------------|-------------------------------
     diff --git a/new b/new         |
     new file mode 100644           |
     index 0000000..5ad28e2         |
     --- /dev/null                  |
     +++ b/new                      |
     @@ -0,0 +1 @@                  |
     +haha                          |

This option is on by default in git-status [1] but we need more fixup
in rename detection code [3]. Luckily we don't need to do anything
else for the rename detection code in diff.c (wt-status.c uses a
customized one).

[1] 425a28e0a4 (diff-lib: allow ita entries treated as "not yet exist
    in index" - 2016-10-24)
[2] b42b451919 (diff: add --ita-[in]visible-in-index - 2016-10-24)
[3] bc3dca07f4 (Merge branch 'nd/ita-wt-renames-in-status' - 2018-01-23)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-29 12:38:49 +09:00
Derrick Stolee
2e27bd7731 treewide: replace maybe_tree with accessor methods
In anticipation of making trees load lazily, create a Coccinelle
script (contrib/coccinelle/commit.cocci) to ensure that all
references to the 'maybe_tree' member of struct commit are either
mutations or accesses through get_commit_tree() or
get_commit_tree_oid().

Apply the Coccinelle script to create the rest of the patch.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11 10:47:16 +09:00
Derrick Stolee
891435d55d treewide: rename tree to maybe_tree
Using the commit-graph file to walk commit history removes the large
cost of parsing commits during the walk. This exposes a performance
issue: lookup_tree() takes a large portion of the computation time,
even when Git never uses those trees.

In anticipation of lazy-loading these trees, rename the 'tree' member
of struct commit to 'maybe_tree'. This serves two purposes: it hints
at the future role of possibly being NULL even if the commit has a
valid tree, and it allows for unambiguous transformation from simple
member access (i.e. commit->maybe_tree) to method access.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11 10:47:16 +09:00
brian m. carlson
eb0ccfd7f5 Switch empty tree and blob lookups to use hash abstraction
Switch the uses of empty_tree_oid and empty_blob_oid to use the
current_hash abstraction that represents the current hash algorithm in
use.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-13 13:20:44 +09:00
Junio C Hamano
8cc633286a Merge branch 'bw/diff-opt-impl-to-bitfields'
A single-word "unsigned flags" in the diff options is being split
into a structure with many bitfields.

* bw/diff-opt-impl-to-bitfields:
  diff: make struct diff_flags members lowercase
  diff: remove DIFF_OPT_CLR macro
  diff: remove DIFF_OPT_SET macro
  diff: remove DIFF_OPT_TST macro
  diff: remove touched flags
  diff: add flag to indicate textconv was set via cmdline
  diff: convert flags to be stored in bitfields
  add, reset: use DIFF_OPT_SET macro to set a diff flag
2017-11-09 14:31:27 +09:00
Junio C Hamano
0b646bcac9 Merge branch 'ma/lockfile-fixes'
An earlier update made it possible to use an on-stack in-core
lockfile structure (as opposed to having to deliberately leak an
on-heap one).  Many codepaths have been updated to take advantage
of this new facility.

* ma/lockfile-fixes:
  read_cache: roll back lock in `update_index_if_able()`
  read-cache: leave lock in right state in `write_locked_index()`
  read-cache: drop explicit `CLOSE_LOCK`-flag
  cache.h: document `write_locked_index()`
  apply: remove `newfd` from `struct apply_state`
  apply: move lockfile into `apply_state`
  cache-tree: simplify locking logic
  checkout-index: simplify locking logic
  tempfile: fix documentation on `delete_tempfile()`
  lockfile: fix documentation on `close_lock_file_gently()`
  treewide: prefer lockfiles on the stack
  sha1_file: do not leak `lock_file`
2017-11-06 13:11:21 +09:00
Brandon Williams
0d1e0e7801 diff: make struct diff_flags members lowercase
Now that the flags stored in struct diff_flags are being accessed
directly and not through macros, change all struct members from being
uppercase to lowercase.
This conversion is done using the following semantic patch:

	@@
	expression E;
	@@
	- E.RECURSIVE
	+ E.recursive

	@@
	expression E;
	@@
	- E.TREE_IN_RECURSIVE
	+ E.tree_in_recursive

	@@
	expression E;
	@@
	- E.BINARY
	+ E.binary

	@@
	expression E;
	@@
	- E.TEXT
	+ E.text

	@@
	expression E;
	@@
	- E.FULL_INDEX
	+ E.full_index

	@@
	expression E;
	@@
	- E.SILENT_ON_REMOVE
	+ E.silent_on_remove

	@@
	expression E;
	@@
	- E.FIND_COPIES_HARDER
	+ E.find_copies_harder

	@@
	expression E;
	@@
	- E.FOLLOW_RENAMES
	+ E.follow_renames

	@@
	expression E;
	@@
	- E.RENAME_EMPTY
	+ E.rename_empty

	@@
	expression E;
	@@
	- E.HAS_CHANGES
	+ E.has_changes

	@@
	expression E;
	@@
	- E.QUICK
	+ E.quick

	@@
	expression E;
	@@
	- E.NO_INDEX
	+ E.no_index

	@@
	expression E;
	@@
	- E.ALLOW_EXTERNAL
	+ E.allow_external

	@@
	expression E;
	@@
	- E.EXIT_WITH_STATUS
	+ E.exit_with_status

	@@
	expression E;
	@@
	- E.REVERSE_DIFF
	+ E.reverse_diff

	@@
	expression E;
	@@
	- E.CHECK_FAILED
	+ E.check_failed

	@@
	expression E;
	@@
	- E.RELATIVE_NAME
	+ E.relative_name

	@@
	expression E;
	@@
	- E.IGNORE_SUBMODULES
	+ E.ignore_submodules

	@@
	expression E;
	@@
	- E.DIRSTAT_CUMULATIVE
	+ E.dirstat_cumulative

	@@
	expression E;
	@@
	- E.DIRSTAT_BY_FILE
	+ E.dirstat_by_file

	@@
	expression E;
	@@
	- E.ALLOW_TEXTCONV
	+ E.allow_textconv

	@@
	expression E;
	@@
	- E.TEXTCONV_SET_VIA_CMDLINE
	+ E.textconv_set_via_cmdline

	@@
	expression E;
	@@
	- E.DIFF_FROM_CONTENTS
	+ E.diff_from_contents

	@@
	expression E;
	@@
	- E.DIRTY_SUBMODULES
	+ E.dirty_submodules

	@@
	expression E;
	@@
	- E.IGNORE_UNTRACKED_IN_SUBMODULES
	+ E.ignore_untracked_in_submodules

	@@
	expression E;
	@@
	- E.IGNORE_DIRTY_SUBMODULES
	+ E.ignore_dirty_submodules

	@@
	expression E;
	@@
	- E.OVERRIDE_SUBMODULE_CONFIG
	+ E.override_submodule_config

	@@
	expression E;
	@@
	- E.DIRSTAT_BY_LINE
	+ E.dirstat_by_line

	@@
	expression E;
	@@
	- E.FUNCCONTEXT
	+ E.funccontext

	@@
	expression E;
	@@
	- E.PICKAXE_IGNORE_CASE
	+ E.pickaxe_ignore_case

	@@
	expression E;
	@@
	- E.DEFAULT_FOLLOW_RENAMES
	+ E.default_follow_renames

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-01 11:51:40 +09:00
Brandon Williams
23dcf77f48 diff: remove DIFF_OPT_SET macro
Remove the `DIFF_OPT_SET` macro and instead set the flags directly.
This conversion is done using the following semantic patch:

	@@
	expression E;
	identifier fld;
	@@
	- DIFF_OPT_SET(&E, fld)
	+ E.flags.fld = 1

	@@
	type T;
	T *ptr;
	identifier fld;
	@@
	- DIFF_OPT_SET(ptr, fld)
	+ ptr->flags.fld = 1

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-01 11:50:03 +09:00
Brandon Williams
3b69daed86 diff: remove DIFF_OPT_TST macro
Remove the `DIFF_OPT_TST` macro and instead access the flags directly.
This conversion is done using the following semantic patch:

	@@
	expression E;
	identifier fld;
	@@
	- DIFF_OPT_TST(&E, fld)
	+ E.flags.fld

	@@
	type T;
	T *ptr;
	identifier fld;
	@@
	- DIFF_OPT_TST(ptr, fld)
	+ ptr->flags.fld

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-01 11:50:03 +09:00
Junio C Hamano
5261fefa4a Merge branch 'ma/builtin-unleak'
Many variables that points at a region of memory that will live
throughout the life of the program have been marked with UNLEAK
marker to help the leak checkers concentrate on real leaks..

* ma/builtin-unleak:
  builtin/: add UNLEAKs
2017-10-07 16:27:55 +09:00
Martin Ågren
837e34eba4 treewide: prefer lockfiles on the stack
There is no longer any need to allocate and leak a `struct lock_file`.
The previous patch addressed an instance where we needed a minor tweak
alongside the trivial changes.

Deal with the remaining instances where we allocate and leak a struct
within a single function. Change them to have the `struct lock_file` on
the stack instead.

These instances were identified by running `git grep "^\s*struct
lock_file\s*\*"`.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-10-06 10:07:17 +09:00