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Jeff King 90d43b0768 teach diffcore-rename to optionally ignore empty content 
Our rename detection is a heuristic, matching pairs of
removed and added files with similar or identical content.
It's unlikely to be wrong when there is actual content to
compare, and we already take care not to do inexact rename
detection when there is not enough content to produce good
results.

However, we always do exact rename detection, even when the
blob is tiny or empty. It's easy to get false positives with
an empty blob, simply because it is an obvious content to
use as a boilerplate (e.g., when telling git that an empty
directory is worth tracking via an empty .gitignore).

This patch lets callers specify whether or not they are
interested in using empty files as rename sources and
destinations. The default is "yes", keeping the original
behavior. It works by detecting the empty-blob sha1 for
rename sources and destinations.

One more flexible alternative would be to allow the caller
to specify a minimum size for a blob to be "interesting" for
rename detection. But that would catch small boilerplate
files, not large ones (e.g., if you had the GPL COPYING file
in many directories).

A better alternative would be to allow a "-rename"
gitattribute to allow boilerplate files to be marked as
such. I'll leave the complexity of that solution until such
time as somebody actually wants it. The complaints we've
seen so far revolve around empty files, so let's start with
the simple thing.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-03-23 13:52:49 -07:00
block-sha1
builtin drop casts from users EMPTY_TREE_SHA1_BIN 2012-03-23 13:52:05 -07:00
compat Merge branch 'bw/inet-pton-ntop-compat' into maint 2012-02-13 23:26:31 -08:00
contrib Merge branch 'th/git-diffall' 2012-03-15 21:54:42 -07:00
Documentation Update draft release notes to 1.7.10 2012-03-16 08:42:22 -07:00
git-gui
git_remote_helpers
gitk-git
gitweb Merge branch 'maint-1.7.8' into maint 2012-03-20 15:53:30 -07:00
mergetools mergetools: add a plug-in to support DeltaWalker 2012-03-05 09:31:47 -08:00
perl perl/Makefile: install Git::I18N under NO_PERL_MAKEMAKER 2012-03-16 09:15:28 -07:00
po l10n: Improve zh_CN translation for msg "not something we can merge" 2012-03-09 00:22:56 +08:00
ppc
t Merge branch 'maint-1.7.8' into maint 2012-03-20 15:53:30 -07:00
templates
vcs-svn
xdiff
.gitattributes
.gitignore
.mailmap
abspath.c
aclocal.m4
advice.c
advice.h
alias.c
alloc.c
archive-tar.c
archive-zip.c
archive.c
archive.h
argv-array.c
argv-array.h
attr.c
attr.h
base85.c
bisect.c
bisect.h rev-list: fix --verify-objects --quiet becoming --objects 2012-02-28 10:47:30 -08:00
blob.c
blob.h
branch.c
branch.h
builtin.h
bulk-checkin.c
bulk-checkin.h
bundle.c Merge branch 'tr/maint-bundle-boundary' into maint 2012-03-12 15:46:54 -07:00
bundle.h
cache-tree.c Merge branch 'jc/maint-commit-ignore-i-t-a' into maint 2012-02-16 14:08:00 -08:00
cache-tree.h
cache.h make is_empty_blob_sha1 available everywhere 2012-03-23 13:52:13 -07:00
check-builtins.sh
check-racy.c
check_bindir
color.c
color.h
combine-diff.c
command-list.txt
commit.c
commit.h
config.c Merge branch 'ms/maint-config-error-at-eol-linecount' 2012-03-13 12:35:53 -07:00
config.mak.in Makefile: introduce CHARSET_LIB to link with -lcharset 2012-02-13 00:11:01 -08:00
configure.ac configure: allow user to prevent $PATH "sanitization" on Solaris 2012-03-09 11:39:51 -08:00
connect.c
connected.c fetch/receive: remove over-pessimistic connectivity check 2012-03-15 15:23:17 -07:00
connected.h
convert.c Merge branch 'jk/maint-avoid-streaming-filtered-contents' into maint 2012-03-04 22:16:40 -08:00
convert.h teach convert_to_git a "dry run" mode 2012-02-24 14:11:27 -08:00
copy.c
COPYING
credential-cache--daemon.c
credential-cache.c
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c Merge branch 'jc/pickaxe-ignore-case' 2012-03-07 12:12:59 -08:00
daemon.c
date.c Merge branch 'jc/parse-date-raw' into maint 2012-02-13 11:42:15 -08:00
decorate.c
decorate.h
delta.h
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c teach diffcore-rename to optionally ignore empty content 2012-03-23 13:52:49 -07:00
diff.h teach diffcore-rename to optionally ignore empty content 2012-03-23 13:52:49 -07:00
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c pickaxe: allow -i to search in patch case-insensitively 2012-02-28 16:15:29 -08:00
diffcore-rename.c teach diffcore-rename to optionally ignore empty content 2012-03-23 13:52:49 -07:00
diffcore.h
dir.c
dir.h
editor.c
entry.c
environment.c
exec_cmd.c
exec_cmd.h
fast-import.c two fixes for fast-import's "ls" command 2012-03-16 08:19:18 -07:00
fetch-pack.h
fixup-builtins
fmt-merge-msg.h
fsck.c
fsck.h
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl
git-am.sh am: officially deprecate -b/--binary option 2012-03-13 12:21:04 -07:00
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'jc/pickaxe-ignore-case' 2012-03-07 12:12:59 -08:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh
git-difftool.perl
git-filter-branch.sh
git-instaweb.sh
git-lost-found.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-parse-remote.sh Make git-{pull,rebase} message without tracking information friendlier 2012-03-04 23:00:57 -08:00
git-pull.sh Make git-{pull,rebase} message without tracking information friendlier 2012-03-04 23:00:57 -08:00
git-quiltimport.sh
git-rebase--am.sh
git-rebase--interactive.sh
git-rebase--merge.sh rebase -m: only call "notes copy" when rewritten exists and is non-empty 2012-02-26 16:32:37 -08:00
git-rebase.sh Make git-{pull,rebase} message without tracking information friendlier 2012-03-04 23:00:57 -08:00
git-relink.perl
git-remote-testgit.py
git-repack.sh
git-request-pull.sh
git-send-email.perl
git-sh-i18n.sh i18n: fix auto detection of gettext scheme for shell scripts 2012-03-12 14:41:15 -07:00
git-sh-setup.sh Merge branch 'jc/parse-date-raw' into maint 2012-02-13 11:42:15 -08:00
git-stash.sh
git-submodule.sh submodules: fix ambiguous absolute paths under Windows 2012-03-04 21:22:46 -08:00
git-svn.perl git-svn.perl: fix a false-positive in the "already exists" test 2012-02-21 21:37:31 +00:00
GIT-VERSION-GEN Git 1.7.10-rc1 2012-03-14 15:47:45 -07:00
git-web--browse.sh
git.c
git.spec.in
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c Merge branch 'jc/pickaxe-ignore-case' 2012-03-07 12:12:59 -08:00
grep.h
hash.c
hash.h
help.c pager: find out the terminal width before spawning the pager 2012-02-13 15:08:47 -08:00
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c
http-walker.c
http.c http: support proxies that require authentication 2012-03-02 14:40:14 -08:00
http.h
ident.c
imap-send.c
INSTALL
kwset.c
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
list-objects.c
list-objects.h
ll-merge.c
ll-merge.h
lockfile.c
log-tree.c
log-tree.h
mailmap.c
mailmap.h
Makefile Merge branch 'master' into git-po 2012-02-28 12:23:26 +08:00
match-trees.c
merge-file.c
merge-file.h
merge-recursive.c drop casts from users EMPTY_TREE_SHA1_BIN 2012-03-23 13:52:05 -07:00
merge-recursive.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes.c
notes.h
object.c
object.h
pack-check.c
pack-refs.c
pack-refs.h
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
pager.c Merge branches zj/decimal-width, zj/term-columns and jc/diff-stat-scaler 2012-02-24 16:07:04 -08:00
parse-options-cb.c
parse-options.c parse-options: typo check for unknown switches 2012-03-04 18:28:59 -08:00
parse-options.h parse-options: remove PARSE_OPT_NEGHELP 2012-02-28 11:48:11 -08:00
patch-delta.c
patch-ids.c
patch-ids.h
path.c
pkt-line.c
pkt-line.h
preload-index.c
pretty.c
progress.c
progress.h
prompt.c
prompt.h
quote.c
quote.h
reachable.c
reachable.h
read-cache.c make is_empty_blob_sha1 available everywhere 2012-03-23 13:52:13 -07:00
README README: point to Documentation/SubmittingPatches 2012-02-23 11:35:59 -08:00
reflog-walk.c
reflog-walk.h
refs.c refs: remove the extra_refs API 2012-02-12 19:50:39 -08:00
refs.h refs: remove the extra_refs API 2012-02-12 19:50:39 -08:00
RelNotes Git 1.7.9.4 2012-03-12 15:52:52 -07:00
remote-curl.c
remote.c push: add '--prune' option 2012-02-22 18:17:39 -08:00
remote.h push: add '--prune' option 2012-02-22 18:17:39 -08:00
replace_object.c
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c Merge branch 'jc/pickaxe-ignore-case' 2012-03-07 12:12:59 -08:00
revision.h
run-command.c
run-command.h
send-pack.h
sequencer.c drop casts from users EMPTY_TREE_SHA1_BIN 2012-03-23 13:52:05 -07:00
sequencer.h
server-info.c
setup.c
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-lookup.c
sha1-lookup.h
sha1_file.c Merge branch 'jk/maint-avoid-streaming-filtered-contents' into maint 2012-03-04 22:16:40 -08:00
sha1_name.c
shallow.c
shell.c
shortlog.h
show-index.c
sideband.c
sideband.h
sigchain.c
sigchain.h
strbuf.c Merge branch 'tr/maint-bundle-long-subject' into maint 2012-03-04 22:16:30 -08:00
strbuf.h Merge branch 'tr/maint-bundle-long-subject' into maint 2012-03-04 22:16:30 -08:00
streaming.c
streaming.h
string-list.c
string-list.h
submodule.c
submodule.h
symlinks.c Add threaded versions of functions in symlinks.c. 2012-03-02 23:56:28 -08:00
tag.c
tag.h
tar.h
test-chmtime.c
test-credential.c
test-ctype.c
test-date.c
test-delta.c
test-dump-cache-tree.c
test-genrandom.c
test-index-version.c
test-line-buffer.c
test-match-trees.c
test-mktemp.c
test-parse-options.c test-parse-options: convert to OPT_BOOL() 2012-02-26 15:18:41 -08:00
test-path-utils.c
test-run-command.c
test-scrap-cache-tree.c
test-sha1.c
test-sha1.sh
test-sigchain.c
test-subprocess.c
test-svn-fe.c
thread-utils.c
thread-utils.h
trace.c
transport-helper.c Merge branch 'sp/smart-http-failure-to-push' into maint 2012-03-04 22:16:33 -08:00
transport.c Merge branch 'fc/push-prune' 2012-02-26 23:05:45 -08:00
transport.h push: add '--prune' option 2012-02-22 18:17:39 -08:00
tree-diff.c
tree-walk.c
tree-walk.h
tree.c
tree.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c
unpack-trees.h
upload-pack.c
url.c
url.h
usage.c
userdiff.c
userdiff.h
utf8.c
utf8.h
walker.c
walker.h
wrap-for-bin.sh
wrapper.c
write_or_die.c
ws.c
wt-status.c
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

README 

////////////////////////////////////////////////////////////////

	GIT - the stupid content tracker

////////////////////////////////////////////////////////////////

"git" can mean anything, depending on your mood.

 - random three-letter combination that is pronounceable, and not
   actually used by any common UNIX command.  The fact that it is a
   mispronunciation of "get" may or may not be relevant.
 - stupid. contemptible and despicable. simple. Take your pick from the
   dictionary of slang.
 - "global information tracker": you're in a good mood, and it actually
   works for you. Angels sing, and a light suddenly fills the room.
 - "goddamn idiotic truckload of sh*t": when it breaks

Git is a fast, scalable, distributed revision control system with an
unusually rich command set that provides both high-level operations
and full access to internals.

Git is an Open Source project covered by the GNU General Public License.
It was originally written by Linus Torvalds with help of a group of
hackers around the net. It is currently maintained by Junio C Hamano.

Please read the file INSTALL for installation instructions.

See Documentation/gittutorial.txt to get started, then see
Documentation/everyday.txt for a useful minimum set of commands, and
Documentation/git-commandname.txt for documentation of each command.
If git has been correctly installed, then the tutorial can also be
read with "man gittutorial" or "git help tutorial", and the
documentation of each command with "man git-commandname" or "git help
commandname".

CVS users may also want to read Documentation/gitcvs-migration.txt
("man gitcvs-migration" or "git help cvs-migration" if git is
installed).

Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.

The user discussion and development of Git take place on the Git
mailing list -- everyone is welcome to post bug reports, feature
requests, comments and patches to git@vger.kernel.org (read
Documentation/SubmittingPatches for instructions on patch submission).
To subscribe to the list, send an email with just "subscribe git" in
the body to majordomo@vger.kernel.org. The mailing list archives are
available at http://marc.theaimsgroup.com/?l=git and other archival
sites.

The messages titled "A note from the maintainer", "What's in
git.git (stable)" and "What's cooking in git.git (topics)" and
the discussion following them on the mailing list give a good
reference for project status, development direction and
remaining tasks.