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2014-06-20stat_opt: check extra strlen callLibravatar Jeff King1-1/+2
As in earlier commits, the diff option parser uses starts_with to find that an argument starts with "--stat-", and then adds strlen("stat-") to find the rest of the option. However, in this case the starts_with and the strlen are separated across functions, making it easy to call the latter without the former. Let's use skip_prefix instead of raw pointer arithmetic to catch such a case. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-06-20use skip_prefix to avoid repeating stringsLibravatar Jeff King1-18/+9
It's a common idiom to match a prefix and then skip past it with strlen, like: if (starts_with(foo, "bar")) foo += strlen("bar"); This avoids magic numbers, but means we have to repeat the string (and there is no compiler check that we didn't make a typo in one of the strings). We can use skip_prefix to handle this case without repeating ourselves. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-06-20use skip_prefix to avoid magic numbersLibravatar Jeff King1-31/+34
It's a common idiom to match a prefix and then skip past it with a magic number, like: if (starts_with(foo, "bar")) foo += 3; This is easy to get wrong, since you have to count the prefix string yourself, and there's no compiler check if the string changes. We can use skip_prefix to avoid the magic numbers here. Note that some of these conversions could be much shorter. For example: if (starts_with(arg, "--foo=")) { bar = arg + 6; continue; } could become: if (skip_prefix(arg, "--foo=", &bar)) continue; However, I have left it as: if (skip_prefix(arg, "--foo=", &v)) { bar = v; continue; } to visually match nearby cases which need to actually process the string. Like: if (skip_prefix(arg, "--foo=", &v)) { bar = atoi(v); continue; } Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-06-18parse_diff_color_slot: drop ofs parameterLibravatar Jeff King1-10/+10
This function originally took a whole config variable name ("var") and an offset ("ofs"). It checked "var+ofs" against each color slot, but reported errors using the whole "var". However, since 8b8e862 (ignore unknown color configuration, 2009-12-12), it returns -1 rather than printing its own error, and therefore only cares about var+ofs. We can drop the ofs parameter and teach its sole caller to derive the pointer itself. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-06-16Merge branch 'bg/xcalloc-nmemb-then-size'Libravatar Junio C Hamano1-1/+1
Like calloc(3), xcalloc() takes nmemb and then size. * bg/xcalloc-nmemb-then-size: transport-helper.c: rearrange xcalloc arguments remote.c: rearrange xcalloc arguments reflog-walk.c: rearrange xcalloc arguments pack-revindex.c: rearrange xcalloc arguments notes.c: rearrange xcalloc arguments imap-send.c: rearrange xcalloc arguments http-push.c: rearrange xcalloc arguments diff.c: rearrange xcalloc arguments config.c: rearrange xcalloc arguments commit.c: rearrange xcalloc arguments builtin/remote.c: rearrange xcalloc arguments builtin/ls-remote.c: rearrange xcalloc arguments
2014-06-16Merge branch 'jk/diff-follow-must-take-one-pathspec'Libravatar Junio C Hamano1-0/+3
* jk/diff-follow-must-take-one-pathspec: move "--follow needs one pathspec" rule to diff_setup_done
2014-06-03Merge branch 'jk/external-diff-use-argv-array'Libravatar Junio C Hamano1-31/+25
Code clean-up (and a bugfix which has been merged for 2.0). * jk/external-diff-use-argv-array: run_external_diff: refactor cmdline setup logic run_external_diff: hoist common bits out of conditional run_external_diff: drop fflush(NULL) run_external_diff: clean up error handling run_external_diff: use an argv_array for the environment
2014-06-03Merge branch 'ks/tree-diff-nway'Libravatar Junio C Hamano1-0/+2
Instead of running N pair-wise diff-trees when inspecting a N-parent merge, find the set of paths that were touched by walking N+1 trees in parallel. These set of paths can then be turned into N pair-wise diff-tree results to be processed through rename detections and such. And N=2 case nicely degenerates to the usual 2-way diff-tree, which is very nice. * ks/tree-diff-nway: mingw: activate alloca combine-diff: speed it up, by using multiparent diff tree-walker directly tree-diff: rework diff_tree() to generate diffs for multiparent cases as well Portable alloca for Git tree-diff: reuse base str(buf) memory on sub-tree recursion tree-diff: no need to call "full" diff_tree_sha1 from show_path() tree-diff: rework diff_tree interface to be sha1 based tree-diff: diff_tree() should now be static tree-diff: remove special-case diff-emitting code for empty-tree cases tree-diff: simplify tree_entry_pathcmp tree-diff: show_path prototype is not needed anymore tree-diff: rename compare_tree_entry -> tree_entry_pathcmp tree-diff: move all action-taking code out of compare_tree_entry() tree-diff: don't assume compare_tree_entry() returns -1,0,1 tree-diff: consolidate code for emitting diffs and recursion in one place tree-diff: show_tree() is not needed tree-diff: no need to pass match to skip_uninteresting() tree-diff: no need to manually verify that there is no mode change for a path combine-diff: move changed-paths scanning logic into its own function combine-diff: move show_log_first logic/action out of paths scanning
2014-05-27diff.c: rearrange xcalloc argumentsLibravatar Brian Gesiak1-1/+1
xcalloc() takes two arguments: the number of elements and their size. diffstat_add() passes the arguments in reverse order, passing the size of a diffstat_file*, followed by the number of diffstat_file* to be allocated. Rearrange them so they are in the correct order. Signed-off-by: Brian Gesiak <modocache@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-05-20move "--follow needs one pathspec" rule to diff_setup_doneLibravatar Jeff King1-0/+3
Because of the way "--follow" is implemented, we must have exactly one pathspec. "git log" enforces this restriction, but other users of the revision traversal code do not. For example, "git format-patch --follow" will segfault during try_to_follow_renames, as we have no pathspecs at all. We can push this check down into diff_setup_done, which is probably a better place anyway. It is the diff code that introduces this restriction, so other parts of the code should not need to care themselves. Reported-by: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-28Merge branch 'jk/external-diff-use-argv-array' (early part)Libravatar Junio C Hamano1-16/+16
Crash fix for codepath that miscounted the necessary size for an array when spawning an external diff program. * 'jk/external-diff-use-argv-array' (early part): run_external_diff: use an argv_array for the command line
2014-04-21run_external_diff: refactor cmdline setup logicLibravatar Jeff King1-11/+15
The current logic makes it hard to see what gets put onto the command line in which cases. Pulling out a helper function lets us see that we have two sets of file data, and the second set either uses the original name, or the "other" renamed/copy name. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-21run_external_diff: hoist common bits out of conditionalLibravatar Jeff King1-5/+3
Whether we have diff_filespecs to give to the diff command or not, we always are going to run the program and pass it the pathname. Let's pull that duplicated part out of the conditional to make it more obvious. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-21run_external_diff: drop fflush(NULL)Libravatar Jeff King1-1/+0
This fflush was added in d5535ec (Use run_command() to spawn external diff programs instead of fork/exec., 2007-10-19), because flushing buffers before forking is a good habit. But later, 7d0b18a (Add output flushing before fork(), 2008-08-04) added it to the generic run-command interface, meaning that our flush here is redundant. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-21run_external_diff: clean up error handlingLibravatar Jeff King1-6/+3
When the external diff reports an error, we try to clean up and die. However, we can make this process a bit simpler: 1. We do not need to bother freeing memory, since we are about to exit. Nor do we need to clean up our tempfiles, since the atexit() handler will do it for us. So we can die as soon as we see the error. 3. We can just call die() rather than fprintf/exit. This does technically change our exit code, but the exit code of "1" is not meaningful here. In fact, it is probably wrong, since "1" from diff usually means "completed successfully, but there were differences". And while we're there, we can mark the error message for translation, and drop the full stop at the end to make it more like our other messages. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-21run_external_diff: use an argv_array for the environmentLibravatar Jeff King1-9/+5
We currently use static buffers and a static array for formatting the environment passed to the external diff. There's nothing wrong in the code, but it is much easier to verify that it is correct if we use a dynamic argv_array. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-21run_external_diff: use an argv_array for the command lineLibravatar Jeff King1-16/+16
We currently generate the command-line for the external command using a fixed-length array of size 10. But if there is a rename, we actually need 11 elements (10 items, plus a NULL), and end up writing a random NULL onto the stack. Rather than bump the limit, let's just use an argv_array, which makes this sort of error impossible. Noticed-by: Max L <infthi.inbox@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-17i18n: remove obsolete comments for translators in diffstat generationLibravatar Jiang Xin1-8/+0
Since we do not translate diffstat any more, remove the obsolete comments. Signed-off-by: Jiang Xin <worldhello.net@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-08Merge branch 'jl/nor-or-nand-and'Libravatar Junio C Hamano1-1/+1
Eradicate mistaken use of "nor" (that is, essentially "nor" used not in "neither A nor B" ;-)) from in-code comments, command output strings, and documentations. * jl/nor-or-nand-and: code and test: fix misuses of "nor" comments: fix misuses of "nor" contrib: fix misuses of "nor" Documentation: fix misuses of "nor"
2014-04-07combine-diff: speed it up, by using multiparent diff tree-walker directlyLibravatar Kirill Smelkov1-0/+1
As was recently shown in "combine-diff: optimize combine_diff_path sets intersection", combine-diff runs very slowly. In that commit we optimized paths sets intersection, but that accounted only for ~ 25% of the slowness, and as my tracing showed, for linux.git v3.10..v3.11, for merges a lot of time is spent computing diff(commit,commit^2) just to only then intersect that huge diff to almost small set of files from diff(commit,commit^1). In previous commit, we described the problem in more details, and reworked the diff tree-walker to be general one - i.e. to work in multiple parent case too. Now is the time to take advantage of it for finding paths for combine diff. The implementation is straightforward - if we know, we can get generated diff paths directly, and at present that means no diff filtering or rename/copy detection was requested(*), we can call multiparent tree-walker directly and get ready paths. (*) because e.g. at present, all diffcore transformations work on diff_filepair queues, but in the future, that limitation can be lifted, if filters would operate directly on combine_diff_paths. Timings for `git log --raw --no-abbrev --no-renames` without `-c` ("git log") and with `-c` ("git log -c") and with `-c --merges` ("git log -c --merges") before and after the patch are as follows: linux.git v3.10..v3.11 log log -c log -c --merges before 1.9s 16.4s 15.2s after 1.9s 2.4s 1.1s The result stayed the same. Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-04-07tree-diff: rework diff_tree() to generate diffs for multiparent cases as wellLibravatar Kirill Smelkov1-0/+1
Previously diff_tree(), which is now named ll_diff_tree_sha1(), was generating diff_filepair(s) for two trees t1 and t2, and that was usually used for a commit as t1=HEAD~, and t2=HEAD - i.e. to see changes a commit introduces. In Git, however, we have fundamentally built flexibility in that a commit can have many parents - 1 for a plain commit, 2 for a simple merge, but also more than 2 for merging several heads at once. For merges there is a so called combine-diff, which shows diff, a merge introduces by itself, omitting changes done by any parent. That works through first finding paths, that are different to all parents, and then showing generalized diff, with separate columns for +/- for each parent. The code lives in combine-diff.c . There is an impedance mismatch, however, in that a commit could generally have any number of parents, and that while diffing trees, we divide cases for 2-tree diffs and more-than-2-tree diffs. I mean there is no special casing for multiple parents commits in e.g. revision-walker . That impedance mismatch *hurts* *performance* *badly* for generating combined diffs - in "combine-diff: optimize combine_diff_path sets intersection" I've already removed some slowness from it, but from the timings provided there, it could be seen, that combined diffs still cost more than an order of magnitude more cpu time, compared to diff for usual commits, and that would only be an optimistic estimate, if we take into account that for e.g. linux.git there is only one merge for several dozens of plain commits. That slowness comes from the fact that currently, while generating combined diff, a lot of time is spent computing diff(commit,commit^2) just to only then intersect that huge diff to almost small set of files from diff(commit,commit^1). That's because at present, to compute combine-diff, for first finding paths, that "every parent touches", we use the following combine-diff property/definition: D(A,P1...Pn) = D(A,P1) ^ ... ^ D(A,Pn) (w.r.t. paths) where D(A,P1...Pn) is combined diff between commit A, and parents Pi and D(A,Pi) is usual two-tree diff Pi..A So if any of that D(A,Pi) is huge, tracting 1 n-parent combine-diff as n 1-parent diffs and intersecting results will be slow. And usually, for linux.git and other topic-based workflows, that D(A,P2) is huge, because, if merge-base of A and P2, is several dozens of merges (from A, via first parent) below, that D(A,P2) will be diffing sum of merges from several subsystems to 1 subsystem. The solution is to avoid computing n 1-parent diffs, and to find changed-to-all-parents paths via scanning A's and all Pi's trees simultaneously, at each step comparing their entries, and based on that comparison, populate paths result, and deduce we could *skip* *recursing* into subdirectories, if at least for 1 parent, sha1 of that dir tree is the same as in A. That would save us from doing significant amount of needless work. Such approach is very similar to what diff_tree() does, only there we deal with scanning only 2 trees simultaneously, and for n+1 tree, the logic is a bit more complex: D(T,P1...Pn) calculation scheme ------------------------------- D(T,P1...Pn) = D(T,P1) ^ ... ^ D(T,Pn) (regarding resulting paths set) D(T,Pj) - diff between T..Pj D(T,P1...Pn) - combined diff from T to parents P1,...,Pn We start from all trees, which are sorted, and compare their entries in lock-step: T P1 Pn - - - |t| |p1| |pn| |-| |--| ... |--| imin = argmin(p1...pn) | | | | | | |-| |--| |--| |.| |. | |. | . . . . . . at any time there could be 3 cases: 1) t < p[imin]; 2) t > p[imin]; 3) t = p[imin]. Schematic deduction of what every case means, and what to do, follows: 1) t < p[imin] -> ∀j t ∉ Pj -> "+t" ∈ D(T,Pj) -> D += "+t"; t↓ 2) t > p[imin] 2.1) ∃j: pj > p[imin] -> "-p[imin]" ∉ D(T,Pj) -> D += ø; ∀ pi=p[imin] pi↓ 2.2) ∀i pi = p[imin] -> pi ∉ T -> "-pi" ∈ D(T,Pi) -> D += "-p[imin]"; ∀i pi↓ 3) t = p[imin] 3.1) ∃j: pj > p[imin] -> "+t" ∈ D(T,Pj) -> only pi=p[imin] remains to investigate 3.2) pi = p[imin] -> investigate δ(t,pi) | | v 3.1+3.2) looking at δ(t,pi) ∀i: pi=p[imin] - if all != ø -> ⎧δ(t,pi) - if pi=p[imin] -> D += ⎨ ⎩"+t" - if pi>p[imin] in any case t↓ ∀ pi=p[imin] pi↓ ~ For comparison, here is how diff_tree() works: D(A,B) calculation scheme ------------------------- A B - - |a| |b| a < b -> a ∉ B -> D(A,B) += +a a↓ |-| |-| a > b -> b ∉ A -> D(A,B) += -b b↓ | | | | a = b -> investigate δ(a,b) a↓ b↓ |-| |-| |.| |.| . . . . ~~~~~~~~ This patch generalizes diff tree-walker to work with arbitrary number of parents as described above - i.e. now there is a resulting tree t, and some parents trees tp[i] i=[0..nparent). The generalization builds on the fact that usual diff D(A,B) is by definition the same as combined diff D(A,[B]), so if we could rework the code for common case and make it be not slower for nparent=1 case, usual diff(t1,t2) generation will not be slower, and multiparent diff tree-walker would greatly benefit generating combine-diff. What we do is as follows: 1) diff tree-walker ll_diff_tree_sha1() is internally reworked to be a paths generator (new name diff_tree_paths()), with each generated path being `struct combine_diff_path` with info for path, new sha1,mode and for every parent which sha1,mode it was in it. 2) From that info, we can still generate usual diff queue with struct diff_filepairs, via "exporting" generated combine_diff_path, if we know we run for nparent=1 case. (see emit_diff() which is now named emit_diff_first_parent_only()) 3) In order for diff_can_quit_early(), which checks DIFF_OPT_TST(opt, HAS_CHANGES)) to work, that exporting have to be happening not in bulk, but incrementally, one diff path at a time. For such consumers, there is a new callback in diff_options introduced: ->pathchange(opt, struct combine_diff_path *) which, if set to !NULL, is called for every generated path. (see new compat ll_diff_tree_sha1() wrapper around new paths generator for setup) 4) The paths generation itself, is reworked from previous ll_diff_tree_sha1() code according to "D(A,P1...Pn) calculation scheme" provided above: On the start we allocate [nparent] arrays in place what was earlier just for one parent tree. then we just generalize loops, and comparison according to the algorithm. Some notes(*): 1) alloca(), for small arrays, is used for "runs not slower for nparent=1 case than before" goal - if we change it to xmalloc()/free() the timings get ~1% worse. For alloca() we use just-introduced xalloca/xalloca_free compatibility wrappers, so it should not be a portability problem. 2) For every parent tree, we need to keep a tag, whether entry from that parent equals to entry from minimal parent. For performance reasons I'm keeping that tag in entry's mode field in unused bit - see S_IFXMIN_NEQ. Not doing so, we'd need to alloca another [nparent] array, which hurts performance. 3) For emitted paths, memory could be reused, if we know the path was processed via callback and will not be needed later. We use efficient hand-made realloc-style path_appendnew(), that saves us from ~1-1.5% of potential additional slowdown. 4) goto(s) are used in several places, as the code executes a little bit faster with lowered register pressure. Also - we should now check for FIND_COPIES_HARDER not only when two entries names are the same, and their hashes are equal, but also for a case, when a path was removed from some of all parents having it. The reason is, if we don't, that path won't be emitted at all (see "a > xi" case), and we'll just skip it, and FIND_COPIES_HARDER wants all paths - with diff or without - to be emitted, to be later analyzed for being copies sources. The new check is only necessary for nparent >1, as for nparent=1 case xmin_eqtotal always =1 =nparent, and a path is always added to diff as removal. ~~~~~~~~ Timings for # without -c, i.e. testing only nparent=1 case `git log --raw --no-abbrev --no-renames` before and after the patch are as follows: navy.git linux.git v3.10..v3.11 before 0.611s 1.889s after 0.619s 1.907s slowdown 1.3% 0.9% This timings show we did no harm to usual diff(tree1,tree2) generation. From the table we can see that we actually did ~1% slowdown, but I think I've "earned" that 1% in the previous patch ("tree-diff: reuse base str(buf) memory on sub-tree recursion", HEAD~~) so for nparent=1 case, net timings stays approximately the same. The output also stayed the same. (*) If we revert 1)-4) to more usual techniques, for nparent=1 case, we'll get ~2-2.5% of additional slowdown, which I've tried to avoid, as "do no harm for nparent=1 case" rule. For linux.git, combined diff will run an order of magnitude faster and appropriate timings will be provided in the next commit, as we'll be taking advantage of the new diff tree-walker for combined-diff generation there. P.S. and combined diff is not some exotic/for-play-only stuff - for example for a program I write to represent Git archives as readonly filesystem, there is initial scan with `git log --reverse --raw --no-abbrev --no-renames -c` to extract log of what was created/changed when, as a result building a map {} sha1 -> in which commit (and date) a content was added that `-c` means also show combined diff for merges, and without them, if a merge is non-trivial (merges changes from two parents with both having separate changes to a file), or an evil one, the map will not be full, i.e. some valid sha1 would be absent from it. That case was my initial motivation for combined diffs speedup. Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-31comments: fix misuses of "nor"Libravatar Justin Lebar1-1/+1
Signed-off-by: Justin Lebar <jlebar@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-18Merge branch 'tr/diff-submodule-no-reuse-worktree' into maintLibravatar Junio C Hamano1-2/+3
"git diff --external-diff" incorrectly fed the submodule directory in the working tree to the external diff driver when it knew it is the same as one of the versions being compared. * tr/diff-submodule-no-reuse-worktree: diff: do not reuse_worktree_file for submodules
2014-03-18Merge branch 'nd/diff-quiet-stat-dirty' into maintLibravatar Junio C Hamano1-24/+43
"git diff --quiet -- pathspec1 pathspec2" sometimes did not return correct status value. * nd/diff-quiet-stat-dirty: diff: do not quit early on stat-dirty files diff.c: move diffcore_skip_stat_unmatch core logic out for reuse later
2014-03-18Merge branch 'rm/strchrnul-not-strlen'Libravatar Junio C Hamano1-6/+3
* rm/strchrnul-not-strlen: use strchrnul() in place of strchr() and strlen()
2014-03-18Merge branch 'dd/use-alloc-grow'Libravatar Junio C Hamano1-10/+2
Replace open-coded reallocation with ALLOC_GROW() macro. * dd/use-alloc-grow: sha1_file.c: use ALLOC_GROW() in pretend_sha1_file() read-cache.c: use ALLOC_GROW() in add_index_entry() builtin/mktree.c: use ALLOC_GROW() in append_to_tree() attr.c: use ALLOC_GROW() in handle_attr_line() dir.c: use ALLOC_GROW() in create_simplify() reflog-walk.c: use ALLOC_GROW() replace_object.c: use ALLOC_GROW() in register_replace_object() patch-ids.c: use ALLOC_GROW() in add_commit() diffcore-rename.c: use ALLOC_GROW() diff.c: use ALLOC_GROW() commit.c: use ALLOC_GROW() in register_commit_graft() cache-tree.c: use ALLOC_GROW() in find_subtree() bundle.c: use ALLOC_GROW() in add_to_ref_list() builtin/pack-objects.c: use ALLOC_GROW() in check_pbase_path()
2014-03-14Merge branch 'tr/diff-submodule-no-reuse-worktree'Libravatar Junio C Hamano1-2/+3
"git diff --external-diff" incorrectly fed the submodule directory in the working tree to the external diff driver when it knew it is the same as one of the versions being compared. * tr/diff-submodule-no-reuse-worktree: diff: do not reuse_worktree_file for submodules
2014-03-10use strchrnul() in place of strchr() and strlen()Libravatar Rohit Mani1-6/+3
Avoid scanning strings twice, once with strchr() and then with strlen(), by using strchrnul(). Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Rohit Mani <rohit.mani@outlook.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-07Merge branch 'jc/hold-diff-remove-q-synonym-for-no-deletion'Libravatar Junio C Hamano1-8/+0
Remove a confusing and deprecated "-q" option from "git diff-files"; "git diff-files --diff-filter=d" can be used instead.
2014-03-03diff.c: use ALLOC_GROW()Libravatar Dmitry S. Dolzhenko1-10/+2
Use ALLOC_GROW() instead of open-coding it in diffstat_add() and diff_q(). Signed-off-by: Dmitry S. Dolzhenko <dmitrys.dolzhenko@yandex.ru> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-02-27Merge branch 'nd/diff-quiet-stat-dirty'Libravatar Junio C Hamano1-24/+43
"git diff --quiet -- pathspec1 pathspec2" sometimes did not return correct status value. * nd/diff-quiet-stat-dirty: diff: do not quit early on stat-dirty files diff.c: move diffcore_skip_stat_unmatch core logic out for reuse later
2014-02-24diff: do not quit early on stat-dirty filesLibravatar Nguyễn Thái Ngọc Duy1-5/+17
When QUICK is set (i.e. with --quiet) we try to do as little work as possible, stopping after seeing the first change. stat-dirty is considered a "change" but it may turn out not, if no actual content is changed. The actual content test is performed too late in the process and the shortcut may be taken prematurely, leading to incorrect return code. Assume we do "git diff --quiet". If we have a stat-dirty file "a" and a really dirty file "b". We break the loop in run_diff_files() and stop after "a" because we have got a "change". Later in diffcore_skip_stat_unmatch() we find out "a" is actually not changed. But there's nothing else in the diff queue, we incorrectly declare "no change", ignoring the fact that "b" is changed. This also happens to "git diff --quiet HEAD" when it hits diff_can_quit_early() in oneway_diff(). This patch does the content test earlier in order to keep going if "a" is unchanged. The test result is cached so that when diffcore_skip_stat_unmatch() is done in the end, we spend no cycles on re-testing "a". Reported-by: IWAMOTO Toshihiro <iwamoto@valinux.co.jp> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-02-24diff.c: move diffcore_skip_stat_unmatch core logic out for reuse laterLibravatar Nguyễn Thái Ngọc Duy1-21/+28
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-02-18diff: do not reuse_worktree_file for submodulesLibravatar Thomas Rast1-2/+3
The GIT_EXTERNAL_DIFF calling code attempts to reuse existing worktree files for the worktree side of diffs, for performance reasons. However, that code also tries to do the same with submodules. This results in calls to $GIT_EXTERNAL_DIFF where the old-file is a file of the form "Submodule commit $sha1", but the new-file is a directory in the worktree. Fix it by never reusing a worktree "file" in the submodule case. Reported-by: Grégory Pakosz <gregory.pakosz@gmail.com> Signed-off-by: Thomas Rast <tr@thomasrast.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-27Merge branch 'jk/diff-filespec-cleanup'Libravatar Junio C Hamano1-2/+2
* jk/diff-filespec-cleanup: diff_filespec: use only 2 bits for is_binary flag diff_filespec: reorder is_binary field diff_filespec: drop xfrm_flags field diff_filespec: drop funcname_pattern_ident field diff_filespec: reorder dirty_submodule macro definitions
2014-01-17diff_filespec: drop xfrm_flags fieldLibravatar Jeff King1-2/+2
The only mention of this field in the code is by some debugging code which prints it out (and it will always be zero, since we never touch it otherwise). It was obsoleted very early on by 25d5ea4 ([PATCH] Redo rename/copy detection logic., 2005-05-24). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-10Merge branch 'sb/diff-orderfile-config'Libravatar Junio C Hamano1-0/+5
Allow "git diff -O<file>" to be configured with a new configuration variable. * sb/diff-orderfile-config: diff: add diff.orderfile configuration variable diff: let "git diff -O" read orderfile from any file and fail properly t4056: add new tests for "git diff -O"
2013-12-27Merge branch 'zk/difftool-counts'Libravatar Junio C Hamano1-3/+17
Show the total number of paths and the number of paths shown so far when "git difftool" prompts to launch an external diff tool, which would give users some sense of progress. * zk/difftool-counts: diff.c: fix some recent whitespace style violations difftool: display the number of files in the diff queue in the prompt
2013-12-18diff: add diff.orderfile configuration variableLibravatar Samuel Bronson1-0/+5
diff.orderfile acts as a default for the -O command line option. [sb: split up aw's original patch; rework tests and docs, treat option as pathname] Signed-off-by: Anders Waldenborg <anders@0x63.nu> Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-17Merge branch 'cc/starts-n-ends-with'Libravatar Junio C Hamano1-28/+28
Remove a few duplicate implementations of prefix/suffix comparison functions, and rename them to starts_with and ends_with. * cc/starts-n-ends-with: replace {pre,suf}fixcmp() with {starts,ends}_with() strbuf: introduce starts_with() and ends_with() builtin/remote: remove postfixcmp() and use suffixcmp() instead environment: normalize use of prefixcmp() by removing " != 0"
2013-12-16diff.c: fix some recent whitespace style violationsLibravatar Jeff King1-2/+2
These were introduced by ee7fb0b. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-06difftool: display the number of files in the diff queue in the promptLibravatar Zoltan Klinger1-3/+17
When --prompt option is set, git-difftool displays a prompt for each modified file to be viewed in an external diff program. At that point, it could be useful to display a counter and the total number of files in the diff queue. Below is the current difftool prompt for the first of 5 modified files: Viewing: 'diff.c' Launch 'vimdiff' [Y/n]: Consider the modified prompt: Viewing (1/5): 'diff.c' Launch 'vimdiff' [Y/n]: The current GIT_EXTERNAL_DIFF mechanism does not tell the number of paths in the diff queue nor the current counter. To make this "counter/total" info available for GIT_EXTERNAL_DIFF programs without breaking existing ones by doing the following: - Keep track of the number of paths shown so far in diff_options; - Export two new environment variables from run_external_diff() to show the total number of paths (from diff_queue_struct) and the current value of the counter (from diff_options); and - Update git-difftool--helper to use these two environment variables. Signed-off-by: Zoltan Klinger <zoltan.klinger@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-05replace {pre,suf}fixcmp() with {starts,ends}_with()Libravatar Christian Couder1-28/+28
Leaving only the function definitions and declarations so that any new topic in flight can still make use of the old functions, replace existing uses of the prefixcmp() and suffixcmp() with new API functions. The change can be recreated by mechanically applying this: $ git grep -l -e prefixcmp -e suffixcmp -- \*.c | grep -v strbuf\\.c | xargs perl -pi -e ' s|!prefixcmp\(|starts_with\(|g; s|prefixcmp\(|!starts_with\(|g; s|!suffixcmp\(|ends_with\(|g; s|suffixcmp\(|!ends_with\(|g; ' on the result of preparatory changes in this series. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-10-31Use the word 'stuck' instead of 'sticked'Libravatar Nicolas Vigier1-1/+1
The past participle of 'stick' is 'stuck'. Signed-off-by: Nicolas Vigier <boklm@mars-attacks.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-10-23Merge branch 'mg/more-textconv'Libravatar Junio C Hamano1-0/+3
Make "git grep" and "git show" pay attention to --textconv when dealing with blob objects. * mg/more-textconv: grep: honor --textconv for the case rev:path grep: allow to use textconv filters t7008: demonstrate behavior of grep with textconv cat-file: do not die on --textconv without textconv filters show: honor --textconv for blobs diff_opt: track whether flags have been set explicitly t4030: demonstrate behavior of show with textconv
2013-09-09Merge branch 'jc/diff-filter-negation'Libravatar Junio C Hamano1-21/+104
Teach "git diff --diff-filter" to express "I do not want to see these classes of changes" more directly by listing only the unwanted ones in lowercase (e.g. "--diff-filter=d" will show everything but deletion) and deprecate "diff-files -q" which did the same thing as "--diff-filter=d". * jc/diff-filter-negation: diff: deprecate -q option to diff-files diff: allow lowercase letter to specify what change class to exclude diff: reject unknown change class given to --diff-filter diff: preparse --diff-filter string argument diff: factor out match_filter() diff: pass the whole diff_options to diffcore_apply_filter()
2013-08-09diff: fix a possible null pointer dereferenceLibravatar Stefan Beller1-1/+1
The condition in the ternary operator was wrong, hence the wrong char pointer could be used as the parameter for show_submodule_summary. one->path may be null, but we definitely need a non null path given to the function. Signed-off-by: Stefan Beller <stefanbeller@googlemail.com> Acked-By: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-09diff: remove ternary operator evaluating always to trueLibravatar Stefan Beller1-2/+2
The line being changed is deep inside the function builtin_diff. The variable name_b, which is used to evaluate the ternary expression must evaluate to true at that position, hence the replacement with just name_b. The name_b variable only occurs a few times in that lengthy function: As a parameter to the function itself: static void builtin_diff(const char *name_a, const char *name_b, ... The next occurrences are at: /* Never use a non-valid filename anywhere if at all possible */ name_a = DIFF_FILE_VALID(one) ? name_a : name_b; name_b = DIFF_FILE_VALID(two) ? name_b : name_a; a_one = quote_two(a_prefix, name_a + (*name_a == '/')); b_two = quote_two(b_prefix, name_b + (*name_b == '/')); In the last line of this block 'name_b' is dereferenced and compared to '/'. This would crash if name_b was NULL. Hence in the following code we can assume name_b being non-null. The next occurrence is just as a function argument, which doesn't change the memory, which name_b points to, so the assumption name_b being not null still holds: emit_rewrite_diff(name_a, name_b, one, two, textconv_one, textconv_two, o); The next occurrence would be the line of this patch. As name_b still must be not null, we can remove the ternary operator. Inside the emit_rewrite_diff function there is a also a line ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); which was also simplified as there is also a dereference before the ternary operator. Signed-off-by: Stefan Beller <stefanbeller@googlemail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-24Merge branch 'ob/typofixes'Libravatar Junio C Hamano1-1/+1
* ob/typofixes: typofix: in-code comments typofix: documentation typofix: release notes
2013-07-24Merge branch 'sb/misc-fixes'Libravatar Junio C Hamano1-3/+1
Assorted code cleanups and a minor fix. * sb/misc-fixes: diff.c: Do not initialize a variable, which gets reassigned anyway. commit: Fix a memory leak in determine_author_info daemon.c:handle: Remove unneeded check for null pointer.