Commit Graph

115 Commits

Author SHA1 Message Date
Jay Soffian
92f9e273e8 blame: prevent a segv when -L given start > EOF
blame would segv if given -L <lineno> with <lineno> past the end of the file.
While we're fixing the bug, add test cases for an invalid <start> when called
as -L <start>,<end> or -L<start>.

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-02-08 21:52:44 -08:00
David Reiss
c8cba79181 Prevent git blame from segfaulting on a missing author name
The human-readable author and committer name can be missing from
commits imported from foreign SCM interfaces.  Make sure we parse
the "author" and "committer" line a bit more leniently and avoid
segfaulting by assuming the name always exists.

Signed-off-by: David Reiss <dreiss@facebook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-12-22 11:51:17 -08:00
Johannes Schindelin
a5ca8367c2 blame: make sure that the last line ends in an LF
This is convenient when parsing multiple the blame of multiple files,
for example:

    git ls-files -z --exclude-standard -- "*.[ch]" |
    xargs --null -n 1 git blame -p > output

and then analyzing the 'output' file using a seperate script.

Currently the parsing is difficult when not all files have a newline
at EOF, this patch ensures that even such files have a newline at the
end of the blame output.

Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
CC: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-10-21 17:16:58 -07:00
Brian Gianforcaro
eeefa7c90e Style fixes, add a space after if/for/while.
The majority of code in core git appears to use a single
space after if/for/while. This is an attempt to bring more
code to this standard. These are entirely cosmetic changes.

Signed-off-by: Brian Gianforcaro <b.gianfo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-08-31 23:26:28 -07:00
Thomas Rast
0721c314a5 Use die_errno() instead of die() when checking syscalls
Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem.  Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:

  Function              Passes on error from
  --------              --------------------
  odb_pack_keep         open
  read_ancestry         fopen
  read_in_full          xread
  strbuf_read           xread
  strbuf_read_file      open or strbuf_read_file
  strbuf_readlink       readlink
  write_in_full         xwrite

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27 11:14:53 -07:00
Thomas Rast
d824cbba02 Convert existing die(..., strerror(errno)) to die_errno()
Change calls to die(..., strerror(errno)) to use the new die_errno().

In the process, also make slight style adjustments: at least state
_something_ about the function that failed (instead of just printing
the pathname), and put paths in single quotes.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27 11:14:53 -07:00
Junio C Hamano
433e972aeb Merge branch 'maint'
* maint:
  blame: correctly handle a path that used to be a directory
  add -i: do not dump patch during application
  Update draft release notes for 1.6.3.2
  grep: fix colouring of matches with zero length
  Documentation: teach stash/pop workflow instead of stash/apply
  Change xdl_merge to generate output even for null merges
  t6023: merge-file fails to output anything for a degenerate merge
2009-06-03 00:49:40 -07:00
Junio C Hamano
a9b2d42486 blame: correctly handle a path that used to be a directory
When trying to see if the same path exists in the parent, we ran
"diff-tree" with pathspec set to the path we are interested in with the
parent, and expect either to have exactly one resulting filepair (either
"changed from the parent", "created when there was none") or nothing (when
there is no change from the parent).

If the path used to be a directory, however, we will also see unbounded
number of entries that talk about the files that used to exist underneath
the directory in question.  Correctly pick only the entry that describes
the path we are interested in in such a case (namely, the creation of the
path as a regular file).

Noticed by Ben Willard.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-03 00:49:34 -07:00
Stephen Boyd
3778292017 parse-opts: prepare for OPT_FILENAME
To give OPT_FILENAME the prefix, we pass the prefix to parse_options()
which passes the prefix to parse_options_start() which sets the prefix
member of parse_opts_ctx accordingly. If there isn't a prefix in the
calling context, passing NULL will suffice.

Signed-off-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-05-25 01:07:25 -07:00
Felipe Contreras
4b25d091ba Fix a bunch of pointer declarations (codestyle)
Essentially; s/type* /type */ as per the coding guidelines.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-05-01 15:17:31 -07:00
Junio C Hamano
3fcee259d0 Merge branch 'jc/maint-1.6.0-blame-s'
* jc/maint-1.6.0-blame-s:
  blame: read custom grafts given by -S before calling setup_revisions()

Conflicts:
	builtin-blame.c
2009-03-26 00:28:22 -07:00
Junio C Hamano
aa9ea77de4 blame: read custom grafts given by -S before calling setup_revisions()
setup_revisions() while getting the command line arguments parses the
given commits from the command line, which means their direct parents will
not be rewritten by the custom graft file.

Call read_ancestry() early to work around this issue.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-03-18 00:13:03 -07:00
Junio C Hamano
72e3c32bef Merge branch 'el/blame-date'
* el/blame-date:
  Make git blame's date output format configurable, like git log
2009-03-11 13:47:12 -07:00
Eugene Letuchy
31653c1abc Make git blame's date output format configurable, like git log
Add the following:

 - git config value blame.date that expects one of the git log date
   formats (e.g. relative,local,default,iso,...);

 - git blame command line option --date expects one of the git
   log date formats;

 - documentation in blame-options.txt;

 - git blame uses the appropriate date.c functions and enums to
   make sense of the date format and provide appropriate data;

git blame continues to line up the output columns by padding the date
column up to the max width of the chosen date format.

The date format for git blame without both blame.date and --date continues
to be ISO for backwards compatibility.

git annotate ignores the date format specifiers and continues to uses the
ISO format, as before.

Signed-off-by: Eugene Letuchy <eugene@facebook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-03-05 22:56:13 -08:00
Junio C Hamano
e46f778968 Merge branch 'jc/blame'
* jc/blame:
  blame: show "previous" information in --porcelain/--incremental format
  git-blame: refactor code to emit "porcelain format" output
2009-03-05 15:41:43 -08:00
Junio C Hamano
160d2bc353 Merge branch 'ms/mailmap'
* ms/mailmap:
  Move mailmap documentation into separate file
  Change current mailmap usage to do matching on both name and email of author/committer.
  Add map_user() and clear_mailmap() to mailmap
  Add find_insert_index, insert_at_index and clear_func functions to string_list
  Add mailmap.file as configurational option for mailmap location
2009-02-15 01:44:15 -08:00
Marius Storm-Olsen
d20d654fe8 Change current mailmap usage to do matching on both name and email of author/committer.
Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-02-08 12:36:54 -08:00
Marius Storm-Olsen
d551a48816 Add mailmap.file as configurational option for mailmap location
This allows us to augment the repo mailmap file, and to use
mailmap files elsewhere than the repository root. Meaning
that the entries in mailmap.file will override the entries
in "./.mailmap", should they match.

Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-02-08 12:36:26 -08:00
Geoffrey Thomas
ffaf9cc0ff builtin-blame.c: Use utf8_strwidth for author's names
git blame misaligns output if a author's name has a differing display width and
strlen; for instance, an accented Latin letter that takes two bytes to encode
will cause the rest of the line to be shifted to the left by one. To fix this,
use utf8_strwidth instead of strlen (and compute the padding ourselves, since
printf doesn't know about UTF-8).

Signed-off-by: Geoffrey Thomas <geofft@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-02-04 16:30:45 -08:00
Junio C Hamano
edfd45d2a0 builtin-blame.c: use strbuf_readlink()
When faking a commit out of the work tree contents, use strbuf_readlink()
to read the contents of symbolic links.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-17 13:36:35 -08:00
Junio C Hamano
1e2bba92d2 Merge branch 'rs/blame'
* rs/blame:
  blame: use xdi_diff_hunks(), get rid of struct patch
  add xdi_diff_hunks() for callers that only need hunk lengths
  Allow alternate "low-level" emit function from xdl_diff
  Always initialize xpparam_t to 0
  blame: inline get_patch()
2008-11-08 16:05:39 -08:00
René Scharfe
cdcab133ea blame: use xdi_diff_hunks(), get rid of struct patch
Based on a patch by Brian Downing, this replaces the struct patch based
code for blame passing with calls to xdi_diff_hunks().  This way we
avoid generating and then parsing patches; we only let the interesting
infos be passed to our callbacks instead.  This makes blame a bit faster:

   $ blame="./git blame -M -C -C -p --incremental v1.6.0"

   # master
   $ /usr/bin/time $blame Makefile >/dev/null
   1.38user 0.14system 0:01.52elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
   0inputs+0outputs (0major+12226minor)pagefaults 0swaps
   $ /usr/bin/time $blame cache.h >/dev/null
   1.66user 0.13system 0:01.80elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
   0inputs+0outputs (0major+12262minor)pagefaults 0swaps

   # this patch series
   $ /usr/bin/time $blame Makefile >/dev/null
   1.27user 0.12system 0:01.40elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
   0inputs+0outputs (0major+11836minor)pagefaults 0swaps
   $ /usr/bin/time $blame cache.h >/dev/null
   1.52user 0.12system 0:01.70elapsed 97%CPU (0avgtext+0avgdata 0maxresident)k
   0inputs+0outputs (0major+12052minor)pagefaults 0swaps

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-25 12:09:31 -07:00
Brian Downing
9ccd0a88ac Always initialize xpparam_t to 0
We're going to be adding some parameters to this, so we can't have
any uninitialized data in it.

Signed-off-by: Brian Downing <bdowning@lavos.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-25 12:09:31 -07:00
René Scharfe
7c4ed8c835 blame: inline get_patch()
Inline get_patch() to its only call site as a preparation for getting rid
of struct patch.  Also we don't need to check the ptr members because
fill_origin_blob() already did, and the caller didn't check for NULL
anyway, so drop the test.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-25 12:08:11 -07:00
Alexander Gavrilov
69cd8f6342 builtin-blame: Reencode commit messages according to git-log rules.
Currently git-blame outputs text from the commit messages
(e.g. the author name and the summary string) as-is, without
even providing any information about the encoding used for
the data. It makes interpreting the data in multilingual
environment very difficult.

This commit changes the blame implementation to recode the
messages using the rules used by other commands like git-log.
Namely, the target encoding can be specified through the
i18n.commitEncoding or i18n.logOutputEncoding options, or
directly on the command line using the --encoding parameter.

Converting the encoding before output seems to be more
friendly to the porcelain tools than simply providing the
value of the encoding header, and does not require changing
the output format.

If anybody needs the old behavior, it is possible to
achieve it by specifying --encoding=none.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-21 14:09:34 -07:00
Junio C Hamano
96e117099c blame: show "previous" information in --porcelain/--incremental format
When the final blame is laid for a line to a <commit, path> pair, it also
gives a "previous" information to --porcelain and --incremental output
format.  It gives the parent commit of the blamed commit, _and_ a path in
that parent commit that corresponds to the blamed path --- in short, it is
the origin that would have been blamed (or passed blame through) for the
line _if_ the blamed commit did not change that line.

This unfortunately makes sanity checking of refcount quite complex, so I
ripped it out for now.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-12 13:21:51 -07:00
Junio C Hamano
9991030c0c git-blame: refactor code to emit "porcelain format" output
Both the --porcelain and --incremental format shared the same output
format but implemented with two identical codepaths.  This merges them
into one shared function.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-12 13:21:51 -07:00
Brandon Casey
f285a2d7ed Replace calls to strbuf_init(&foo, 0) with STRBUF_INIT initializer
Many call sites use strbuf_init(&foo, 0) to initialize local
strbuf variable "foo" which has not been accessed since its
declaration. These can be replaced with a static initialization
using the STRBUF_INIT macro which is just as readable, saves a
function call, and takes up fewer lines.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-12 12:36:19 -07:00
Shawn O. Pearce
276328ffb8 Merge branch 'maint'
* maint:
  Update release notes for 1.6.0.3
  Teach rebase -i to honor pre-rebase hook
  docs: describe pre-rebase hook
  do not segfault if make_cache_entry failed
  make prefix_path() never return NULL
  fix bogus "diff --git" header from "diff --no-index"
  Fix fetch/clone --quiet when stdout is connected
  builtin-blame: Fix blame -C -C with submodules.
  bash: remove fetch, push, pull dashed form leftovers

Conflicts:
	diff.c
2008-10-06 08:56:07 -07:00
Alexander Gavrilov
5209ac4de4 builtin-blame: Fix blame -C -C with submodules.
When performing copy detection, git-blame tries to
read gitlinks as blobs, which causes it to die.

This patch adds a check to skip them.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-10-05 23:49:55 -07:00
Junio C Hamano
4a09bc9664 Merge branch 'maint'
* maint:
  Update draft release notes for 1.6.0.2
  stash: refresh the index before deciding if the work tree is dirty
  Mention the fact that 'git annotate' is only for backward compatibility.
  "blame -c" should be compatible with "annotate"
  git-gui: Fix diff parsing for lines starting with "--" or "++"
  git-gui: Fix string escaping in po2msg.sh
  git gui: show diffs with a minimum of 1 context line
  git-gui: update all remaining translations to French.
  git-gui: Update french translation
2008-09-06 16:47:32 -07:00
Junio C Hamano
7ceacdffc5 "blame -c" should be compatible with "annotate"
There is no reason to have a separate variable cmd_is_annotate;
OUTPUT_ANNOTATE_COMPAT option is supposed to produce the compatibility
output, and we should produce the same output even when the command was
not invoked as "annotate" but as "blame -c".

Noticed by Pasky.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-09-05 00:57:35 -07:00
Junio C Hamano
9b8ae93ad9 Merge branch 'maint'
* maint:
  Start 1.6.0.2 maintenance cycle
  tests: use "git xyzzy" form (t7200 - t9001)
  tests: use "git xyzzy" form (t7000 - t7199)
  Fix passwd(5) ref and reflect that commit doens't use commit-tree
  improve handling of sideband message display
  tests: use "git xyzzy" form (t3600 - t6999)
  tests: use "git xyzzy" form (t0000 - t3599)
  checkout: fix message when leaving detached HEAD
  clone: fix creation of explicitly named target directory
  'git foo' program identifies itself without dash in die() messages
  setup_git_directory(): fix move to worktree toplevel directory
  update-index: fix worktree setup
  Start conforming code to "git subcmd" style
  read-tree: setup worktree if merge is required
  grep: fix worktree setup
  diff*: fix worktree setup

Conflicts:
	RelNotes
	t/t3900-i18n-commit.sh
	t/t7003-filter-branch.sh
2008-09-03 16:08:23 -07:00
Heikki Orsila
34baebcee1 Start conforming code to "git subcmd" style
User notifications are presented as 'git cmd', and code comments
are presented as '"cmd"' or 'git's cmd', rather than 'git-cmd'.

Signed-off-by: Heikki Orsila <heikki.orsila@iki.fi>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-30 13:50:48 -07:00
Junio C Hamano
8a3f524bf2 xdiff-interface: hide the whole "xdiff_emit_state" business from the caller
This further enhances xdi_diff_outf() interface so that it takes two
common parameters: the callback function that processes one line at a
time, and a pointer to its application specific callback data structure.
xdi_diff_outf() creates its own "xdiff_emit_state" structure and stashes
these two away inside it, which is used by the lowest level output
function in the xdiff_outf() callchain, consume_one(), to call back to the
application layer.  With this restructuring, we lift the requirement that
the caller supplied callback data structure embeds xdiff_emit_state
structure as its first member.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-14 00:30:26 -07:00
Brian Downing
c99db9d292 Make xdi_diff_outf interface for running xdiff_outf diffs
To prepare for the need to initialize and release resources for an
xdi_diff with the xdiff_outf output function, make a new function to
wrap this usage.

Old:

	ecb.outf = xdiff_outf;
	ecb.priv = &state;
	...
	xdi_diff(file_p, file_o, &xpp, &xecfg, &ecb);

New:

	xdi_diff_outf(file_p, file_o, &state.xm, &xpp, &xecfg, &ecb);

Signed-off-by: Brian Downing <bdowning@lavos.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-08-13 23:10:23 -07:00
Junio C Hamano
b3123f9802 Teach --find-copies-harder to "git blame"
It's equivalent to "-C -C" with the diff family.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 11:22:12 -07:00
Johannes Schindelin
c455c87c5c Rename path_list to string_list
The name path_list was correct for the first usage of that data structure,
but it really is a general-purpose string list.

$ perl -i -pe 's/path-list/string-list/g' $(git grep -l path-list)
$ perl -i -pe 's/path_list/string_list/g' $(git grep -l path_list)
$ git mv path-list.h string-list.h
$ git mv path-list.c string-list.c
$ perl -i -pe 's/has_path/has_string/g' $(git grep -l has_path)
$ perl -i -pe 's/path/string/g' string-list.[ch]
$ git mv Documentation/technical/api-path-list.txt \
	Documentation/technical/api-string-list.txt
$ perl -i -pe 's/strdup_paths/strdup_strings/g' $(git grep -l strdup_paths)

... and then fix all users of string-list to access the member "string"
instead of "path".

Documentation/technical/api-string-list.txt needed some rewrapping, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-21 19:11:50 -07:00
Junio C Hamano
588c038ac6 Merge branch 'sb/dashless'
* sb/dashless:
  Make usage strings dash-less
  t/: Use "test_must_fail git" instead of "! git"
  t/test-lib.sh: exit with small negagive int is ok with test_must_fail

Conflicts:
	builtin-blame.c
	builtin-mailinfo.c
	builtin-mailsplit.c
	builtin-shortlog.c
	git-am.sh
	t/t4150-am.sh
	t/t4200-rerere.sh
2008-07-16 17:22:50 -07:00
Alexander Gavrilov
1617fe9879 Do not try to detect move/copy for entries below threshold.
Splits for such entries are rejected anyway, so there is no
point even trying to compute them.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-15 16:38:33 -07:00
Alexander Gavrilov
eb46328e18 Avoid rescanning unchanged entries in search for copies.
Repeatedly comparing the same entry against the same set
of blobs in search for copies is quite pointless. This
huge waste of effort can be avoided using a flag in
the blame_entry structure.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-15 16:38:32 -07:00
Stephan Beyer
1b1dd23f2d Make usage strings dash-less
When you misuse a git command, you are shown the usage string.
But this is currently shown in the dashed form.  So if you just
copy what you see, it will not work, when the dashed form
is no longer supported.

This patch makes git commands show the dash-less version.

For shell scripts that do not specify OPTIONS_SPEC, git-sh-setup.sh
generates a dash-less usage string now.

Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-13 14:12:48 -07:00
Pierre Habouzit
6b61ec0564 revisions: refactor handle_revision_opt into parse_revision_opt.
It seems we're using handle_revision_opt the same way each time, have a
wrapper around it that does the 9-liner we copy each time instead.

handle_revision_opt can be static in the module for now, it's always
possible to make it public again if needed.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-09 15:14:11 -07:00
Pierre Habouzit
76447d235c git-blame: fix lapsus
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-09 15:11:51 -07:00
Pierre Habouzit
3f8d520489 git-blame: migrate to incremental parse-option [2/2]
Now use handle_revision_args instead of parse_revisions, and simplify the
handling of old-style arguments a lot thanks to the filtering.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-08 15:54:01 -07:00
Pierre Habouzit
5817da0143 git-blame: migrate to incremental parse-option [1/2]
This step merely moves the parser to an incremental version, still using
parse_revisions.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-08 15:40:51 -07:00
Junio C Hamano
8bb65883d1 Merge branch 'jc/blame' (early part) into HEAD
* 'jc/blame' (early part):
  git-blame --reverse
  builtin-blame.c: allow more than 16 parents
  builtin-blame.c: move prepare_final() into a separate function.
  rev-list --children
  revision traversal: --children option

Conflicts:

	Documentation/rev-list-options.txt
	revision.c
2008-07-08 15:25:44 -07:00
Johannes Schindelin
ef90d6d420 Provide git_config with a callback-data parameter
git_config() only had a function parameter, but no callback data
parameter.  This assumes that all callback functions only modify
global variables.

With this patch, every callback gets a void * parameter, and it is hoped
that this will help the libification effort.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-05-14 12:34:44 -07:00
Junio C Hamano
85af7929ee git-blame --reverse
This new option allows "git blame" to read an old version of the file, and
up to which commit each line survived (i.e. their children rewrote the
line out of the contents).  The previous revision machinery update to
decorate each commit with its children was leading to this change.  When
the --reverse option is given, we read the old version and pass blame to
the children of the current suspect, instead of the usual order of
starting from the latest and passing blame to parents.

The standard yardstick of "blame" in git.git history is "rev-list.c" which
was refactored heavily in its existence.  For example:

    git blame -C -C -w --reverse 9de48752..master -- rev-list.c

begins like this:

6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02  1) #include "cache...
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02  2) #include "commi...
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02  3) #include "tree....
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02  4) #include "blob....
213523f4 rev-list.c         (JC Hamano   2006-03-01  5) #include "epoch...
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02  6)
ab57c8dd rev-list.c         (JC Hamano   2006-02-24  7) #define SEEN
ab57c8dd rev-list.c         (JC Hamano   2006-02-24  8) #define INTERES...
213523f4 rev-list.c         (JC Hamano   2006-03-01  9) #define COUNTED...
7e21c29b rev-list.c         (LTorvalds   2005-07-06 10) #define SHOWN  ...
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02 11)
6c41b801 builtin-rev-list.c (JC Hamano   2008-04-02 12) static const ch...
b1349229 rev-list.c         (LTorvalds   2005-07-26 13)    "usage: git-...

This reveals that the original first four lines survived until now in
builtin-rev-list.c , inclusion of "epoch.h" was removed after 213523f4
while the contents was still in rev-list.c.

This mode probably needs more tweaking so that the commit that removed the
line (i.e. the children of the commits listed in the above sample output)
is shown instead to be useful, but then there is a little matter of which
child of a fork point to show.

For now, you can find the diff that rewrote the fifth line above by doing:

    $ git log --children 213523f4^..

to find its child, which is 1025fe5 (Merge branch 'lt/rev-list' into next,
2006-03-01), and then look at that child with:

    $ git show 1025fe5

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-12 19:41:29 -07:00
Junio C Hamano
69264f46a1 builtin-blame.c: allow more than 16 parents
This removes the hardcoded 16 parents limit from git-blame by allowing the
parent array to be allocated dynamically.  As the ultimate objective is
not about allowing dodecapus, but about annotating the history upside
down, it also renames "parent" in the code to "scapegoat"; the name of the
game used to be "pass blame to your parents", but now it is "find a
scapegoat to pass blame on".

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-04-12 19:41:29 -07:00