Rewrite timezone handling to support tzinfo zones, not fixed offsets #2
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- In addition to fixed offsets, tzinfo timezone names may now be used in the --tz and --move-zone options, and in the AuthorMap file. - --tz now doesn't just affect the log display, it changes the interpretation of the local timestamps in SCCS deltas. Without --tz, deltas are treated as in the system default timezone, or as specified by the TZ environment variable. In all cases, there is proper handling of daylight/summer time, which was previously lacking. - --move-zone has changed from --move-offset. It is now a new timezone name or offset, not an hour offset from the previous zone. - The AuthorMap parser is now much more robust, and can accept all forms of time zone specs. - A timezone specified in the AuthorMap now takes precedence over --move-zone. - Previously, specifying an AuthorMap file prevented fallback to system login name lookup, which it now does.
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This looks very interesting too. I'll try it with my test case repository soon! |
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I intend for you to merge my other PR (#1) first, which will cause a couple of merge conflicts with this one (around the option parsing). I’m not sure if I have the appropriate perms to fix them, or if you have to do this. I could always merge your updated master into this branch locally and then push, but I don't know if that's the cleanest github strategy. After this, I think I’m done with major hacking on this project for a while, as it now meets my needs. |
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--tzand--move-zoneoptions, and in the AuthorMap file.--tznow doesn’t just affect the log display, it changes the interpretation of the local timestamps in SCCS deltas. Without--tz, deltas are treated as in the system default timezone, or as specified by the TZ environment variable. In all cases, there is proper handling of daylight/summer time, which was previously lacking.--move-zonehas changed from--move-offset. It is now a new timezone name or offset, not an hour offset from the previous zone.--move-zone.This improved timezone handling doesn’t require any third-party modules, but ZoneInfo does require a fairly recent version of Python, 3.9, released in 2020. Everything should be golden on modern Posix-compatible systems, but Windows and some containers may lack a proper tzinfo backend, requiring additional modules.
For Windows specifically, depending on the local zone fallback will not properly handle daylight/summer time, but this can be mitigated by always specifying a tzinfo zone name with the
--tzoption. This could be improved by using the third-party tzlocal module, but I didn’t do this to avoid a third-party dependency.