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Jeff King b74cf64803 for-each-ref: avoid loading objects to print %(objectname) 
If you ask for-each-ref to print each ref and its object,
like:

  git for-each-ref --format='%(objectname) %(refname)'

this should involve little more work than looking at the ref
files (and packed-refs) themselves. However, for-each-ref
will actually load each object from disk just to print its
sha1. For most repositories, this isn't a big deal, but it
can be noticeable if you have a large number of refs to
print. Here are best-of-five timings for the command above
on a repo with ~10K refs:

  [before]
  real    0m0.112s
  user    0m0.092s
  sys     0m0.016s

  [after]
  real    0m0.014s
  user    0m0.012s
  sys     0m0.000s

This patch checks for %(objectname) and %(objectname:short)
before we actually parse the object (and the rest of the
code is smart enough to avoid parsing if we have filled all
of our placeholders).

Note that we can't simply move the objectname parsing code
into the early loop. If the "deref" form %(*objectname) is
used, then we do need to parse the object in order to peel
the tag. So instead of moving the code, we factor it out
into a separate function that can be called for both cases.

While we're at it, we add some basic tests for the
dereferenced placeholders, which were not tested at all
before. This helps ensure we didn't regress that case.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-10-30 10:33:46 -07:00
..
add.c Merge branch 'mm/color-auto-default' 2013-07-22 11:23:10 -07:00
annotate.c
apply.c Git 1.8.3.4 2013-07-22 11:34:25 -07:00
archive.c pkt-line: provide a LARGE_PACKET_MAX static buffer 2013-02-20 13:42:22 -08:00
bisect--helper.c i18n: bisect--helper: mark parseopt strings for translation 2012-08-20 12:23:15 -07:00
blame.c Merge branch 'tr/line-log' 2013-06-02 16:00:44 -07:00
branch.c branch: colour upstream branches 2013-04-15 11:04:44 -07:00
bundle.c
cat-file.c Revert "cat-file: split --batch input lines on whitespace" 2013-08-02 09:29:30 -07:00
check-attr.c Merge branch 'maint' 2012-09-17 15:59:34 -07:00
check-ignore.c Merge branch 'as/check-ignore' 2013-05-29 14:23:40 -07:00
check-mailmap.c builtin: add git-check-mailmap command 2013-07-13 10:19:37 -07:00
check-ref-format.c
checkout-index.c Use imperative form in help usage to describe an action 2012-08-22 12:02:28 -07:00
checkout.c Merge branch 'nd/const-struct-cache-entry' 2013-07-22 11:24:01 -07:00
clean.c Merge branch 'jx/clean-interactive' 2013-08-01 11:52:37 -07:00
clone.c Merge branch 'jk/maint-clone-shared-no-connectivity-validation' 2013-07-18 12:48:29 -07:00
column.c i18n: column: mark parseopt strings for translation 2012-08-20 12:23:16 -07:00
commit-tree.c commit-tree: document -S option consistently 2013-03-25 15:01:22 -07:00
commit.c Merge branch 'jk/commit-how-to-abort-cherry-pick' 2013-07-31 12:38:23 -07:00
config.c Merge branch 'hv/config-from-blob' 2013-07-22 11:24:09 -07:00
count-objects.c count-objects: add -H option to humanize sizes 2013-04-10 13:27:26 -07:00
credential.c
describe.c describe: fix --contains when a tag is given as input 2013-07-18 15:16:23 -07:00
diff-files.c
diff-index.c update-index/diff-index: use core.preloadindex to improve performance 2012-11-02 11:38:29 -04:00
diff-tree.c
diff.c cmd_diff(): make it obvious which cases are exclusive of each other 2013-05-28 09:25:01 -07:00
fast-export.c many small typofixes 2013-07-29 12:32:25 -07:00
fetch-pack.c Merge branch 'jk/pkt-line-cleanup' 2013-04-01 08:59:37 -07:00
fetch.c Merge branch 'mh/reflife' 2013-06-14 08:46:14 -07:00
fmt-merge-msg.c Merge branch 'rt/commentchar-fmt-merge-msg' into maint 2013-04-26 11:10:47 -07:00
for-each-ref.c for-each-ref: avoid loading objects to print %(objectname) 2013-10-30 10:33:46 -07:00
fsck.c fsck: don't put a void*-shaped peg in a char*-shaped hole 2013-05-28 09:25:01 -07:00
gc.c silence git gc --auto --quiet output 2012-09-27 17:57:26 -07:00
grep.c Merge branch 'jx/clean-interactive' 2013-07-22 11:24:11 -07:00
hash-object.c i18n: hash-object: mark parseopt strings for translation 2012-08-20 12:23:17 -07:00
help.c Merge branch 'ph/builtin-srcs-are-in-subdir-these-days' into maint 2013-07-21 22:51:29 -07:00
index-pack.c clone: open a shortcut for connectivity check 2013-05-28 08:07:20 -07:00
init-db.c i18n: init-db: mark parseopt strings for translation 2012-08-20 12:23:17 -07:00
log.c teach format-patch to place other authors into in-body "From" 2013-07-03 12:11:04 -07:00
ls-files.c Merge branch 'jx/clean-interactive' 2013-07-22 11:24:11 -07:00
ls-remote.c ls-remote: document the '--get-url' option 2012-09-07 10:58:35 -07:00
ls-tree.c pathspec: save the non-wildcard length part 2012-11-19 13:08:28 -08:00
mailinfo.c Merge branch 'jc/same-encoding' into maint 2012-12-07 14:10:56 -08:00
mailsplit.c mailsplit: sort maildir filenames more cleverly 2013-03-02 22:52:44 -08:00
merge-base.c use logical OR (||) instead of binary OR (|) in logical context 2013-06-13 14:47:07 -07:00
merge-file.c i18n: merge-file: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
merge-index.c Convert "struct cache_entry *" to "const ..." wherever possible 2013-07-09 09:12:48 -07:00
merge-ours.c
merge-recursive.c
merge-tree.c merge-tree: handle directory/empty conflict correctly 2013-05-06 22:17:00 -07:00
merge.c Merge branch 'nd/const-struct-cache-entry' 2013-07-22 11:24:01 -07:00
mktag.c
mktree.c i18n: mktree: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
mv.c i18n: mv: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
name-rev.c describe: fix --contains when a tag is given as input 2013-07-18 15:16:23 -07:00
notes.c Merge branch 'ph/builtin-srcs-are-in-subdir-these-days' into maint 2013-07-21 22:51:29 -07:00
pack-objects.c Merge branch 'jk/peel-ref' 2012-10-25 06:42:27 -04:00
pack-redundant.c Fix sizeof usage in get_permutations 2012-12-13 11:13:44 -08:00
pack-refs.c pack-refs: merge code from pack-refs.{c,h} into refs.{c,h} 2013-05-01 15:33:11 -07:00
patch-id.c
prune-packed.c prune-packed: avoid implying "1" is DRY_RUN in prune_packed_objects() 2013-05-28 09:20:54 -07:00
prune.c Merge branch 'nd/prune-packed-dryrun-verbose' 2013-06-06 12:17:52 -07:00
push.c many small typofixes 2013-07-29 12:32:25 -07:00
read-tree.c diff-lib, read-tree, unpack-trees: mark cache_entry array paramters const 2013-06-02 15:31:14 -07:00
receive-pack.c Merge branch 'jk/receive-pack-deadlocks-with-early-failure' into maint 2013-04-26 11:12:17 -07:00
reflog.c Merge branch 'jc/prune-all' 2013-05-29 14:23:04 -07:00
remote-ext.c
remote-fd.c
remote.c remote: check for superfluous arguments in 'git remote add' 2013-04-24 13:12:51 -07:00
replace.c fix "builtin-*" references to be "builtin/*" 2013-06-18 11:05:51 -07:00
rerere.c i18n: rerere: mark parseopt strings for translation 2012-08-20 12:23:19 -07:00
reset.c pretty: --format output should honor logOutputEncoding 2013-06-26 11:40:31 -07:00
rev-list.c pretty: --format output should honor logOutputEncoding 2013-06-26 11:40:31 -07:00
rev-parse.c rev-parse: add --prefix option 2013-06-17 13:30:01 -07:00
revert.c Add the LAST_ARG_MUST_BE_NULL macro 2013-07-19 09:26:15 -07:00
rm.c Merge branch 'jc/rm-submodule-error-message' 2013-08-01 11:57:25 -07:00
send-pack.c teach get_remote_heads to read from a memory buffer 2013-02-24 00:17:38 -08:00
shortlog.c pretty: --format output should honor logOutputEncoding 2013-06-26 11:40:31 -07:00
show-branch.c Merge branch 'tr/do-not-call-submodules-subprojects' 2013-07-22 11:23:30 -07:00
show-ref.c Merge branch 'db/show-ref-head' 2013-07-22 11:23:56 -07:00
stripspace.c Allow custom "comment char" 2013-01-16 12:48:22 -08:00
symbolic-ref.c git symbolic-ref --delete $symref 2012-10-21 12:17:38 -07:00
tag.c Merge branch 'ph/tag-force-no-warn-on-creation' into maint 2013-04-03 09:24:51 -07:00
tar-tree.c
unpack-file.c
unpack-objects.c
update-index.c Convert "struct cache_entry *" to "const ..." wherever possible 2013-07-09 09:12:48 -07:00
update-ref.c Use imperative form in help usage to describe an action 2012-08-22 12:02:28 -07:00
update-server-info.c i18n: update-server-info: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00
upload-archive.c pkt-line: provide a LARGE_PACKET_MAX static buffer 2013-02-20 13:42:22 -08:00
var.c
verify-pack.c i18n: verify-pack: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00
verify-tag.c gpg_interface: allow to request status return 2013-02-14 09:30:04 -08:00
write-tree.c i18n: write-tree: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00