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'--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>
166 lines
5.3 KiB
Plaintext
166 lines
5.3 KiB
Plaintext
git-ls-tree(1)
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==============
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NAME
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----
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git-ls-tree - List the contents of a tree object
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SYNOPSIS
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--------
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[verse]
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'git ls-tree' [-d] [-r] [-t] [-l] [-z]
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[--name-only] [--name-status] [--object-only] [--full-name] [--full-tree] [--abbrev[=<n>]] [--format=<format>]
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<tree-ish> [<path>...]
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DESCRIPTION
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-----------
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Lists the contents of a given tree object, like what "/bin/ls -a" does
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in the current working directory. Note that:
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- the behaviour is slightly different from that of "/bin/ls" in that the
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'<path>' denotes just a list of patterns to match, e.g. so specifying
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directory name (without `-r`) will behave differently, and order of the
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arguments does not matter.
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- the behaviour is similar to that of "/bin/ls" in that the '<path>' is
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taken as relative to the current working directory. E.g. when you are
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in a directory 'sub' that has a directory 'dir', you can run 'git
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ls-tree -r HEAD dir' to list the contents of the tree (that is
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`sub/dir` in `HEAD`). You don't want to give a tree that is not at the
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root level (e.g. `git ls-tree -r HEAD:sub dir`) in this case, as that
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would result in asking for `sub/sub/dir` in the `HEAD` commit.
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However, the current working directory can be ignored by passing
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--full-tree option.
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OPTIONS
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-------
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<tree-ish>::
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Id of a tree-ish.
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-d::
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Show only the named tree entry itself, not its children.
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-r::
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Recurse into sub-trees.
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-t::
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Show tree entries even when going to recurse them. Has no effect
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if `-r` was not passed. `-d` implies `-t`.
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-l::
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--long::
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Show object size of blob (file) entries.
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-z::
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\0 line termination on output and do not quote filenames.
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See OUTPUT FORMAT below for more information.
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--name-only::
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--name-status::
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List only filenames (instead of the "long" output), one per line.
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Cannot be combined with `--object-only`.
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--object-only::
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List only names of the objects, one per line. Cannot be combined
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with `--name-only` or `--name-status`.
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This is equivalent to specifying `--format='%(objectname)'`, but
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for both this option and that exact format the command takes a
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hand-optimized codepath instead of going through the generic
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formatting mechanism.
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--abbrev[=<n>]::
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Instead of showing the full 40-byte hexadecimal object
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lines, show the shortest prefix that is at least '<n>'
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hexdigits long that uniquely refers the object.
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Non default number of digits can be specified with --abbrev=<n>.
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--full-name::
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Instead of showing the path names relative to the current working
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directory, show the full path names.
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--full-tree::
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Do not limit the listing to the current working directory.
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Implies --full-name.
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--format=<format>::
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A string that interpolates `%(fieldname)` from the result
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being shown. It also interpolates `%%` to `%`, and
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`%xx` where `xx` are hex digits interpolates to character
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with hex code `xx`; for example `%00` interpolates to
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`\0` (NUL), `%09` to `\t` (TAB) and `%0a` to `\n` (LF).
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When specified, `--format` cannot be combined with other
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format-altering options, including `--long`, `--name-only`
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and `--object-only`.
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[<path>...]::
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When paths are given, show them (note that this isn't really raw
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pathnames, but rather a list of patterns to match). Otherwise
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implicitly uses the root level of the tree as the sole path argument.
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Output Format
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-------------
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The output format of `ls-tree` is determined by either the `--format`
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option, or other format-altering options such as `--name-only` etc.
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(see `--format` above).
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The use of certain `--format` directives is equivalent to using those
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options, but invoking the full formatting machinery can be slower than
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using an appropriate formatting option.
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In cases where the `--format` would exactly map to an existing option
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`ls-tree` will use the appropriate faster path. Thus the default format
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is equivalent to:
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%(objectmode) %(objecttype) %(objectname)%x09%(path)
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This output format is compatible with what `--index-info --stdin` of
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'git update-index' expects.
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When the `-l` option is used, format changes to
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%(objectmode) %(objecttype) %(objectname) %(objectsize:padded)%x09%(path)
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Object size identified by <objectname> is given in bytes, and right-justified
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with minimum width of 7 characters. Object size is given only for blobs
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(file) entries; for other entries `-` character is used in place of size.
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Without the `-z` option, pathnames with "unusual" characters are
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quoted as explained for the configuration variable `core.quotePath`
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(see linkgit:git-config[1]). Using `-z` the filename is output
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verbatim and the line is terminated by a NUL byte.
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Customized format:
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It is possible to print in a custom format by using the `--format` option,
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which is able to interpolate different fields using a `%(fieldname)` notation.
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For example, if you only care about the "objectname" and "path" fields, you
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can execute with a specific "--format" like
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git ls-tree --format='%(objectname) %(path)' <tree-ish>
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FIELD NAMES
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-----------
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Various values from structured fields can be used to interpolate
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into the resulting output. For each outputing line, the following
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names can be used:
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objectmode::
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The mode of the object.
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objecttype::
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The type of the object (`blob` or `tree`).
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objectname::
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The name of the object.
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objectsize[:padded]::
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The size of the object ("-" if it's a tree).
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It also supports a padded format of size with "%(size:padded)".
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path::
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The pathname of the object.
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GIT
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---
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Part of the linkgit:git[1] suite
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