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| author |  Teng Long <dyroneteng@gmail.com> | 2022-03-23 17:13:13 +0800 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2022-03-23 11:38:40 -0700 |
| commit | cab851c2f8c190bed93719ca8c712fdfcc3c7182 (patch) | |
| tree | c16ec0ab0e594ed42a555c6c5a79e8dab04e49ae /Documentation | |
| parent | ls-tree: introduce "--format" option (diff) | |
| download | tgif-cab851c2f8c190bed93719ca8c712fdfcc3c7182.tar.xz | |
ls-tree: support --object-only option for "git-ls-tree"
'--object-only' is an alias for '--format=%(objectname)'. It cannot
be used together other format-altering options like '--name-only',
'--long' or '--format', they are mutually exclusive.
The "--name-only" option outputs <filepath> only. Likewise, <objectName>
is another high frequency used field, so implement '--object-only' option
will bring intuitive and clear semantics for this scenario. Using
'--format=%(objectname)' we can achieve a similar effect, but the former
is with a lower learning cost(without knowing the format requirement
of '--format' option).
Even so, if a user is prefer to use "--format=%(objectname)", this is entirely
welcome because they are not only equivalent in function, but also have almost
identical performance. The reason is this commit also add the specific of
"--format=%(objectname)" to the current fast-pathes (builtin formats) to
avoid running unnecessary parsing mechanisms.
The following performance benchmarks are based on torvalds/linux.git:
When hit the fast-path:
Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --object-only HEAD
Time (mean ± σ): 83.6 ms ± 2.0 ms [User: 59.4 ms, System: 24.1 ms]
Range (min … max): 80.4 ms … 87.2 ms 35 runs
Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --format='%(objectname)' HEAD
Time (mean ± σ): 84.1 ms ± 1.8 ms [User: 61.7 ms, System: 22.3 ms]
Range (min … max): 80.9 ms … 87.5 ms 35 runs
But for a customized format, it will be slower:
Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --format='oid: %(objectname)' HEAD
Time (mean ± σ): 96.5 ms ± 2.5 ms [User: 72.9 ms, System: 23.5 ms]
Range (min … max): 93.1 ms … 104.1 ms 31 runs
Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Teng Long <dyroneteng@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/git-ls-tree.txt | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/git-ls-tree.txt b/Documentation/git-ls-tree.txt index 68bf1cf325..43aebb9938 100644 --- a/Documentation/git-ls-tree.txt +++ b/Documentation/git-ls-tree.txt @@ -10,7 +10,7 @@ SYNOPSIS -------- [verse] 'git ls-tree' [-d] [-r] [-t] [-l] [-z] - [--name-only] [--name-status] [--full-name] [--full-tree] [--abbrev[=<n>]] [--format=<format>] + [--name-only] [--name-status] [--object-only] [--full-name] [--full-tree] [--abbrev[=<n>]] [--format=<format>] <tree-ish> [<path>...] DESCRIPTION @@ -59,6 +59,15 @@ OPTIONS --name-only:: --name-status:: List only filenames (instead of the "long" output), one per line. + Cannot be combined with `--object-only`. + +--object-only:: + List only names of the objects, one per line. Cannot be combined + with `--name-only` or `--name-status`. + This is equivalent to specifying `--format='%(objectname)'`, but + for both this option and that exact format the command takes a + hand-optimized codepath instead of going through the generic + formatting mechanism. --abbrev[=<n>]:: Instead of showing the full 40-byte hexadecimal object |