[tz] Patch for ziguard.awk

[Neil Fuller]

Thanks for the response.

I just looked at some of the later transforms in ziguard.awk, i.e. ones
that don't just comment or uncomment. I completely agree it would be
difficult to make it reversible!

Neil.



On Sun, 11 Oct 2020 at 19:07, Paul Eggert <eggert at cs.ucla.edu> wrote:

> Thanks; although I would ziguard.awk to be simpler, that patch would
> mishandle
> some cases (see below). So for now I'll just install the attached proposed
> comment to document the primary use cases. If you can clean up ziguard.awk
> to
> also be idempotent etc. that would be nice, but it's not essential.
>
> $ cp ziguard.awk ziguard.awk.bak
> $ patch <0001-Fix-ziguard.awk-for-Rule-lines.patch
> patching file ziguard.awk
> $ awk -v DATAFORM=rearguard -f ziguard.awk.bak africa antarctica asia
> australasia europe northamerica southamerica factory backward >old.zi
> $ awk -v DATAFORM=rearguard -f ziguard.awk africa antarctica asia
> australasia
> europe northamerica southamerica factory backward >new.zi
> $ diff -u old.zi new.zi
> --- old.zi      2020-10-11 10:34:28.979780689 -0700
> +++ new.zi      2020-10-11 10:34:39.351761185 -0700
> @@ -8262,13 +8262,13 @@
>   # summer and negative daylight saving time in winter.  It is for when
>   # negative SAVE values are used.
>   # Rule        NAME    FROM    TO      -       IN      ON      AT
> SAVE    LETTER/S
> -#Rule  Eire    1971    only    -       Oct     31       2:00u  -1:00   -
> -#Rule  Eire    1972    1980    -       Mar     Sun>=16  2:00u  0       -
> -#Rule  Eire    1972    1980    -       Oct     Sun>=23  2:00u  -1:00   -
> -#Rule  Eire    1981    max     -       Mar     lastSun  1:00u  0       -
> -#Rule  Eire    1981    1989    -       Oct     Sun>=23  1:00u  -1:00   -
> -#Rule  Eire    1990    1995    -       Oct     Sun>=22  1:00u  -1:00   -
> -#Rule  Eire    1996    max     -       Oct     lastSun  1:00u  -1:00   -
> +Rule   Eire    1971    only    -       Oct     31       2:00u  -1:00   -
> +Rule   Eire    1972    1980    -       Mar     Sun>=16  2:00u  0       -
> +Rule   Eire    1972    1980    -       Oct     Sun>=23  2:00u  -1:00   -
> +Rule   Eire    1981    max     -       Mar     lastSun  1:00u  0       -
> +Rule   Eire    1981    1989    -       Oct     Sun>=23  1:00u  -1:00   -
> +Rule   Eire    1990    1995    -       Oct     Sun>=22  1:00u  -1:00   -
> +Rule   Eire    1996    max     -       Oct     lastSun  1:00u  -1:00   -
>
>   # Zone        NAME            STDOFF  RULES   FORMAT  [UNTIL]
>   Zone  Europe/Dublin   -0:25:00 -      LMT     1880 Aug  2
>


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