status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

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from __future__ import absolute_import

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import os

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from mercurial import (

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    dispatch,

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    extensions,

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    ui as uimod,

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)

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     9

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def testdispatch(cmd):

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    """Simple wrapper around dispatch.dispatch()

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    Prints command and result value, but does not handle quoting.

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    """

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    ui = uimod.ui.load()

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    extensions.populateui(ui)

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    ui.statusnoi18n(b"running: %s\n" % cmd)

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    req = dispatch.request(cmd.split(), ui)

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    result = dispatch.dispatch(req)

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    ui.statusnoi18n(b"result: %r\n" % result)

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# create file 'foo', add and commit

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f = open(b'foo', 'wb')

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f.write(b'foo\n')

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f.close()

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testdispatch(b"--debug add foo")

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testdispatch(b"--debug commit -m commit1 -d 2000-01-01 foo")

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# append to file 'foo' and commit

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f = open(b'foo', 'ab')

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f.write(b'bar\n')

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f.close()

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# remove blackbox.log directory (proxy for readonly log file)

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os.rmdir(b".hg/blackbox.log")

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# replace it with the real blackbox.log file

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os.rename(b".hg/blackbox.log-", b".hg/blackbox.log")

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testdispatch(b"--debug commit -m commit2 -d 2000-01-02 foo")

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# check 88803a69b24 (fancyopts modified command table)

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testdispatch(b"--debug log -r 0")

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testdispatch(b"--debug log -r tip")