author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 18 Oct 2021 11:23:07 +0200 | |
changeset 48260 | 269ff8978086 |
child 48262 | 68bb472aee9c |
permissions | -rw-r--r-- |
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# Copyright Mercurial Contributors |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import stat |
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rangemask = 0x7FFFFFFF |
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class timestamp(tuple): |
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""" |
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A Unix timestamp with nanoseconds precision, |
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modulo 2**31 seconds. |
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A 2-tuple containing: |
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`truncated_seconds`: seconds since the Unix epoch, |
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truncated to its lower 31 bits |
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`subsecond_nanoseconds`: number of nanoseconds since `truncated_seconds`. |
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""" |
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def __new__(cls, value): |
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truncated_seconds, subsec_nanos = value |
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value = (truncated_seconds & rangemask, subsec_nanos) |
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return super(timestamp, cls).__new__(cls, value) |
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def zero(): |
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""" |
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Returns the `timestamp` at the Unix epoch. |
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""" |
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return tuple.__new__(timestamp, (0, 0)) |
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def mtime_of(stat_result): |
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""" |
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Takes an `os.stat_result`-like object and returns a `timestamp` object |
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for its modification time. |
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""" |
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# https://docs.python.org/2/library/os.html#os.stat_float_times |
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# "For compatibility with older Python versions, |
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# accessing stat_result as a tuple always returns integers." |
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secs = stat_result[stat.ST_MTIME] |
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# For now |
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subsec_nanos = 0 |
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return timestamp((secs, subsec_nanos)) |