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2007-09-10Rework pretty_print_commit to use strbufs instead of custom buffers.Pierre Habouzit
Also remove the "len" parameter, as: (1) it was used as a max boundary, and every caller used ~0u (2) we check for final NUL no matter what, so it doesn't help for speed. As a result most of the pp_* function takes 3 arguments less, and we need a lot less local variables, this makes the code way more readable, and easier to extend if needed. This patch also fixes some spacing and cosmetic issues. This patch also fixes (as a side effect) a memory leak intoruced in builtin-archive.c at commit df4a394f (fmt was xmalloc'ed and not free'd) Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-14Add --log-size to git log to print message sizeMarco Costalba
With this option git-log prints log message size just before the corresponding message. Porcelain tools could use this to speedup parsing of git-log output. Note that size refers to log message only. If also patch content is shown its size is not included. In case it is not possible to know the size upfront size value is set to zero. Signed-off-by: Marco Costalba <mcostalba@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-04Handle missing prefix for "Subject:" as if no prefix givenAlex Riesen
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-07-01Don't fflush(stdout) when it's not helpfulTheodore Ts'o
This patch arose from a discussion started by Jim Meyering's patch whose intention was to provide better diagnostics for failed writes. Linus proposed a better way to do things, which also had the added benefit that adding a fflush() to git-log-* operations and incremental git-blame operations could improve interactive respose time feel, at the cost of making things a bit slower when we aren't piping the output to a downstream program. This patch skips the fflush() calls when stdout is a regular file, or if the environment variable GIT_FLUSH is set to "0". This latter can speed up a command such as: GIT_FLUSH=0 strace -c -f -e write time git-rev-list HEAD | wc -l a tiny amount. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-06-13Lift 16kB limit of log message outputJunio C Hamano
Traditionally we had 16kB limit when formatting log messages for output, because it was easier to arrange for the caller to have a reasonably big buffer and pass it down without ever worrying about reallocating. This changes the calling convention of pretty_print_commit() to lift this limit. Instead of the buffer and remaining length, it now takes a pointer to the pointer that points at the allocated buffer, and another pointer to the location that stores the allocated length, and reallocates the buffer as necessary. To support the user format, the error return of interpolate() needed to be changed. It used to return a bool telling "Ok the result fits", or "Sorry, I had to truncate it". Now it returns 0 on success, and returns the size of the buffer it wants in order to fit the whole result. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-05-06Merge branch 'maint'Junio C Hamano
* maint: Small correction in reading of commit headers Documentation: fix typo in git-remote.txt Add test for blame corner cases. blame: -C -C -C blame: Notice a wholesale incorporation of an existing file. Fix --boundary output diff format documentation: describe raw combined diff format Mention version 1.5.1 in tutorial and user-manual Add --no-rebase option to git-svn dcommit Fix markup in git-svn man page
2007-05-06Fix --boundary outputLinus Torvalds
"git log --boundary" incorrectly honoured the option only when "left-right" was enabled. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-26Add --date={local,relative,default}Junio C Hamano
This adds --date={local,relative,default} option to log family of commands, to allow displaying timestamps in user's local timezone, relative time, or the default format. Existing --relative-date option is a synonym of --date=relative; we could probably deprecate it in the long run. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-16Add support for "commit name decorations" to log family of commandsLinus Torvalds
This adds "--decorate" as a log option, which prints out the ref names of any commits that are shown. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-12Add custom subject prefix support to format-patch (take 3)Robin H. Johnson
Add a new option to git-format-patch, entitled --subject-prefix that allows control of the subject prefix '[PATCH]'. Using this option, the text 'PATCH' is replaced with whatever input is provided to the option. This allows easily generating patches like '[PATCH 2.6.21-rc3]' or properly numbered series like '[-mm3 PATCH N/M]'. This patch provides the implementation and documentation. Signed-off-by: Robin H. Johnson <robbat2@gentoo.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-05format-patch --attach: not folding some long headers.Junio C Hamano
Panagiotis Issaris reports that some MUAs seem not to like folded "content-type" and "content-disposition" headers, so this makes format-patch --attach output to avoid them. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-05format-patch: add --inline option and make --attach a true attachmentJohannes Schindelin
The existing --attach option did not create a true "attachment" but multipart/mixed with Content-Disposition: inline. It should have been with Content-Disposition: attachment. Introduce --inline to add multipart/mixed that is inlined, and make --attach to create an attachement. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-02-23pretty-formats: add 'format:<string>'Johannes Schindelin
With this patch, $ git show -s \ --pretty=format:' Ze komit %h woss%n dunn buy ze great %an' shows something like Ze komit 04c5c88 woss dunn buy ze great Junio C Hamano The supported placeholders are: '%H': commit hash '%h': abbreviated commit hash '%T': tree hash '%t': abbreviated tree hash '%P': parent hashes '%p': abbreviated parent hashes '%an': author name '%ae': author email '%ad': author date '%aD': author date, RFC2822 style '%ar': author date, relative '%at': author date, UNIX timestamp '%cn': committer name '%ce': committer email '%cd': committer date '%cD': committer date, RFC2822 style '%cr': committer date, relative '%ct': committer date, UNIX timestamp '%e': encoding '%s': subject '%b': body '%Cred': switch color to red '%Cgreen': switch color to green '%Cblue': switch color to blue '%Creset': reset color '%n': newline Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-02-09format-patch -n: make sorting easier by padding numberJohannes Schindelin
Now, when format-patch outputs more than 9 patches, the numbers are padded accordingly. Example: [PATCH 009/167] The 9th patch of a series of 167 Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-02-09log --reflog: honour --relative-dateJohannes Schindelin
If you say "git log -g --relative-date", it is very likely that you want to see the reflog names in terms of a relative date. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-02-07Fix "git log -z" behaviourLinus Torvalds
For commit messages, we should really put the "line_termination" when we output the character in between different commits, *not* between the commit and the diff. The diff goes hand-in-hand with the commit, it shouldn't be separated from it with the termination character. So this: - uses the termination character for true inter-commit spacing - uses a regular newline between the commit log and the diff We had it the other way around. For the normal case where the termination character is '\n', this obviously doesn't change anything at all, since we just switched two identical characters around. So it's very safe - it doesn't change any normal usage, but it definitely fixes "git log -z". By fixing "git log -z", you can now also do insane things like git log -p -z | grep -z "some patch expression" | tr '\0' '\n' | less -S and you will see only those commits that have the "some patch expression" in their commit message _or_ their patches. (This is slightly different from 'git log -S"some patch expression"', since the latter requires the expression to literally *change* in the patch, while the "git log -p -z | grep .." approach will see it if it's just an unchanged _part_ of the patch context) Of course, if you actually do something like the above, you're probably insane, but hey, it works! Try the above command line for a demonstration (of course, you need to change the "some patch expression" to be something relevant). The old behaviour of "git log -p -z" was useless (and got things completely wrong for log entries without patches). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-28git-log -g --pretty=oneline should display the reflog messageNicolas Pitre
In the context of reflog output the reflog message is more useful than the commit message's first line. When relevant the reflog message will contain that line anyway. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-21Fix --walk-reflog with --pretty=onelineJunio C Hamano
Now, "git log --abbrev-commit --pretty=o --walk-reflogs HEAD" is reasonably pleasant to use. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-21Teach the revision walker to walk by reflogs with --walk-reflogsJohannes Schindelin
When called with "--walk-reflogs", as long as there are reflogs available, the walker will take this information into account, rather than the parent information in the commit object. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-12-17Teach all of log family --left-right output.Junio C Hamano
This makes reviewing git log --left-right --merge --no-merges -p a lot more pleasant. Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-10-27Make git-cherry handle root treesRene Scharfe
This patch on top of 'next' makes built-in git-cherry handle root commits. It moves the static function log-tree.c::diff_root_tree() to tree-diff.c and makes it more similar to diff_tree_sha1() by shuffling around arguments and factoring out the call to log_tree_diff_flush(). Consequently the name is changed to diff_root_tree_sha1(). It is a version of diff_tree_sha1() that compares the empty tree (= root tree) against a single 'real' tree. This function is then used in get_patch_id() to compute patch IDs for initial commits instead of SEGFAULTing, as the current code does if confronted with parentless commits. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-30log-tree.c: cleanup a bit append_signoff()Franck Bui-Huu
This patch clean up append_signoff() by moving specific code that looks up for "^[-A-Za-z]+: [^@]+@" pattern into a function. It also stops the primary search when the cursor oversteps 'buf + at' limit. This patch changes slightly append_signoff() behaviour too. If we detect any Signed-off-by pattern during the primary search, we needn't to do a pattern research after. Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-28Add --relative-date option to the revision interfaceJonas Fonseca
Exposes the infrastructure from 9a8e35e98793af086f05d1ca9643052df9b44a74. Signed-off-by: Jonas Fonseca <fonseca@diku.dk> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-14Add a newline before appending "Signed-off-by: " lineFranck Bui-Huu
Whef the last line of the commit log message does not end with "^[-A-Za-z]+: [^@]+@", append a newline after it to separate the body of the commit log message from the run of sign-off and ack lines. e.g. "Signed-off-by: A U Thor <au.thor@example.com>" or "Acked-by: Me <myself@example.org>". Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-07log-tree: show_log() should respect the setting of diffopt->line_terminationRyan Anderson
Signed-off-by: Ryan Anderson <ryan@michonline.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-07-25Merge branch 'jt/format-patch'Junio C Hamano
* jt/format-patch: builtin-log: typefix for recent format-patch changes. Add option to set initial In-Reply-To/References Add option to enable threading headers git-format-patch: Make the second and subsequent mails replies to the first
2006-07-24Always reset the color _before_ printing out the newlineJohannes Schindelin
This patch brings the benefits of part of v1.4.1-rc2~37 to the "commit" colorizing patch. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-07-24Colorize 'commit' lines in log uiJeff King
When paging through the output of git-whatchanged, the color cues help to visually navigate within a diff. However, it is difficult to notice when a new commit starts, because the commit and log are shown in the "normal" color. This patch colorizes the 'commit' line, customizable through diff.colors.commit and defaulting to yellow. As a side effect, some of the diff color engine (slot enum, get_color) has become accessible outside of diff.c. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-07-15git-format-patch: Make the second and subsequent mails replies to the firstJosh Triplett
Add message_id and ref_message_id fields to struct rev_info, used in show_log with CMIT_FMT_EMAIL to set Message-Id and In-Reply-To/References respectively. Use these in git-format-patch to make the second and subsequent patch mails replies to the first patch mail. Signed-off-by: Josh Triplett <josh@freedesktop.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-27Fix some more diff options changes.Junio C Hamano
This fixes various problems in the new diff options code. - Fix --cc/-c --patch; it showed two-tree diff used internally. - Use "---\n" only where it matters -- that is, use it immediately after the commit log text when we show a commit log and something else before the patch text. - Do not output spurious extra "\n"; have an extra newline after the commit log text always when we have diff output and we are not doing oneline. - When running a pickaxe you need to go recursive. Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-26Add msg_sep to diff_optionsTimo Hirvonen
Add msg_sep variable to struct diff_options. msg_sep is printed after commit message. Default is "\n", format-patch sets it to "---\n". This also removes the second argument from show_log() because all callers derived it from the first argument: show_log(rev, rev->loginfo, ... Signed-off-by: Timo Hirvonen <tihirvon@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-26Merge with_raw, with_stat and summary variables to output_formatTimo Hirvonen
DIFF_FORMAT_* are now bit-flags instead of enumerated values. Signed-off-by: Timo Hirvonen <tihirvon@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-02format-patch: resurrect extra headers from configJohannes Schindelin
Once again, if you have [format] headers = "Origamization: EvilEmpire\n" format-patch will add these headers just after the "Subject:" line. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-31format-patch --signoffJunio C Hamano
This resurrects --signoff option to format-patch. Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-24Merge branch 'js/fmt-patch'Junio C Hamano
This makes "git format-patch" a built-in. * js/fmt-patch: git-rebase: use canonical A..B syntax to format-patch git-format-patch: now built-in. fmt-patch: Support --attach fmt-patch: understand old <his> notation Teach fmt-patch about --keep-subject Teach fmt-patch about --numbered fmt-patch: implement -o <dir> fmt-patch: output file names to stdout Teach fmt-patch to write individual files. Use RFC2822 dates from "git fmt-patch". git-fmt-patch: thinkofix to show [PATCH] properly. rename internal format-patch wip Minor tweak on subject line in --pretty=email Tentative built-in format-patch.
2006-05-21fmt-patch: Support --attachJohannes Schindelin
This patch touches a couple of files, because it adds options to print a custom text just after the subject of a commit, and just after the diffstat. [jc: made "many dashes" used as the boundary leader into a single variable, to reduce the possibility of later tweaks to miscount the number of dashes to break it.] Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-06Merge branch 'master' into js/fmt-patchJunio C Hamano
* master: (109 commits) t1300-repo-config: two new config parsing tests. Another config file parsing fix. update-index: plug memory leak from prefix_path() checkout-index: plug memory leak from prefix_path() update-index --unresolve: work from a subdirectory. pack-object: squelch eye-candy on non-tty core.prefersymlinkrefs: use symlinks for .git/HEAD repo-config: trim white-space before comment Fix for config file section parsing. Clarify git-cherry documentation. Update git-unpack-objects documentation. Fix up docs where "--" isn't displayed correctly. Several trivial documentation touch ups. git-svn 1.0.0 git-svn: documentation updates delta: stricter constness Makefile: do not link rev-list any specially. builtin-push: --all and --tags _are_ explicit refspecs builtin-log/whatchanged/show: make them official. show-branch: omit uninteresting merges. ...
2006-05-05Teach fmt-patch about --keep-subjectJohannes Schindelin
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-05Teach fmt-patch about --numberedJohannes Schindelin
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-03Fix "git-log --parents" breakage post v1.3.0Linus Torvalds
Post 1.3.0 "git log" forgets to list parent commits on the first line when --parents is given. git-cvsserver relied on it. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-18Tentative built-in format-patch.Junio C Hamano
This only does --stdout right now. To write into separate files with pretty-printed filenames like the real thing does, it needs a bit mroe work. Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-18Log message printout cleanups (#3): fix --pretty=onelineLinus Torvalds
This option is very special, since pretty_print_commit() will _remove_ the newline at the end of it, so we want to have an extra separator between the things. I added a honking big comment this time, so that (a) I don't forget this _again_ (I broke "oneline" several times during this printout cleanup), and so that people can understand _why_ the code does what it does. Now, arguably the alternate fix is to always have the '\n' at the end in pretty-print-commit, but git-rev-list depends on the current behaviour (but we could have git-rev-list remove it, whatever). With the big comment, the code hopefully doesn't get broken again. And now things like git log --pretty=oneline --cc --patch-with-stat works (even if that is admittedly a totally insane combination: if you want the patch, having the "oneline" log format is just crazy, but hey, it _works_. Even insane people are people). Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-18Log message printout cleanups (#2)Linus Torvalds
Here's a further patch on top of the previous one with cosmetic improvements (no "real" code changes, just trivial updates): - it gets the "---" before a diffstat right, including for the combined merge case. Righ now the logic is that we always use "---" when we have a diffstat, and an empty line otherwise. That's how I visually prefer it, but hey, it can be tweaked later. - I made "diff --cc/combined" add the "---/+++" header lines too. The thing won't be mistaken for a valid diff, since the "@@" lines have too many "@" characters (three or more), but it just makes it visually match a real diff, which at least to me makes a big difference in readability. Without them, it just looks very "wrong". I guess I should have taken the filename from each individual entry (and had one "---" file per parent), but I didn't even bother to try to see how that works, so this was the simple thing. With this, doing a git log --cc --patch-with-stat looks quite readable, I think. The only nagging issue - as far as I'm concerned - is that diffstats for merges are pretty questionable the way they are done now. I suspect it would be better to just have the _first_ diffstat, and always make the merge diffstat be the one for "result against first parent". Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-17Log message printout cleanupsLinus Torvalds
On Sun, 16 Apr 2006, Junio C Hamano wrote: > > In the mid-term, I am hoping we can drop the generate_header() > callchain _and_ the custom code that formats commit log in-core, > found in cmd_log_wc(). Ok, this was nastier than expected, just because the dependencies between the different log-printing stuff were absolutely _everywhere_, but here's a patch that does exactly that. The patch is not very easy to read, and the "--patch-with-stat" thing is still broken (it does not call the "show_log()" thing properly for merges). That's not a new bug. In the new world order it _should_ do something like if (rev->logopt) show_log(rev, rev->logopt, "---\n"); but it doesn't. I haven't looked at the --with-stat logic, so I left it alone. That said, this patch removes more lines than it adds, and in particular, the "cmd_log_wc()" loop is now a very clean: while ((commit = get_revision(rev)) != NULL) { log_tree_commit(rev, commit); free(commit->buffer); commit->buffer = NULL; } so it doesn't get much prettier than this. All the complexity is entirely hidden in log-tree.c, and any code that needs to flush the log literally just needs to do the "if (rev->logopt) show_log(...)" incantation. I had to make the combined_diff() logic take a "struct rev_info" instead of just a "struct diff_options", but that part is pretty clean. This does change "git whatchanged" from using "diff-tree" as the commit descriptor to "commit", and I changed one of the tests to reflect that new reality. Otherwise everything still passes, and my other tests look fine too. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-16Fixes for option parsingLinus Torvalds
Make sure "git show" always show the header, regardless of whether there is a diff or not. Also, make sure "always_show_header" actually works, since generate_header only tested it in one out of three return paths. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-16log/whatchanged/show - log formatting cleanup.Junio C Hamano
This moves the decision to print the log message, while diff options are in effect, to log-tree. It gives behaviour closer to the traditional one. Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15Common option parsing for "git log --diff" and friendsLinus Torvalds
This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-09log-tree: separate major part of diff-tree.Junio C Hamano
This separates out the part that deals with one-commit diff-tree (and --stdin form) into a separate log-tree module. There are two goals with this. The more important one is to be able to make this part available to "git log --diff", so that we can have a native "git whatchanged" command. Another is to simplify the commit log generation part simpler. Signed-off-by: Junio C Hamano <junkio@cox.net>