CLI passed %Z fails to parse

[jtmoon79]

Problem

The following command-line fails:

$ ./target/debug/s4 /var/log/syslog -a '2022-08-08 12:00:00 PST'
...
     process_dt: datetime_parse_from_str("2022-08-08 12:00:00 PST", "%Y-%m-%d %H:%M:%S %Z", true, +00:00)
        →datetime_parse_from_str: datetime_parse_from_str(pattern "%Y-%m-%d %H:%M:%S %Z", tz_offset +00:00, data "2022-08-08 12:00:00 PST")
        ←datetime_parse_from_str: DateTime::parse_from_str("2022-08-08 12:00:00 PST", "%Y-%m-%d %H:%M:%S %Z") failed ParseError: input is not enough for unique date and time
...
ERROR: Unable to parse a datetime from "2022-08-08 12:00:00 PST"

The --help message suggests possible datetimes:

$ ./target/release/s4 --help
super_speedy_syslog_searcher 0.0.25
....
DateTime Filter patterns may be:
    "%Y%m%dT%H%M%S"
    "%Y%m%dT%H%M%S%z"
    "%Y%m%dT%H%M%S%Z"
    "%Y-%m-%d %H:%M:%S"
    "%Y-%m-%d %H:%M:%S %z"
    "%Y-%m-%d %H:%M:%S %Z"
    "%Y-%m-%dT%H:%M:%S"
    "%Y-%m-%dT%H:%M:%S %z"
    "%Y-%m-%dT%H:%M:%S %Z"
    "%Y/%m/%d %H:%M:%S"
    "%Y/%m/%d %H:%M:%S %z"
    "%Y/%m/%d %H:%M:%S %Z"
    "%Y%m%d"
    "%Y%m%d %z"
    "%Y%m%d %Z"
    "+%s"
...

Solution

Support %Z parsing for command-line passed -a or -b.

[jtmoon79]

One way to do this:
modify DTPD! defined in datetime.rs to have a flag, "is it acceptable for CLI?".
Gather those flagged DTPD! entries at run-time (or build-time), and iterate through them within fn process_dt, making calls to . This allows re-using the facilities built in datetime.rs, and not having divergent methods for transforming a string to a DateTimeL.

[jtmoon79]

A different way to do this:

Modify fn datetime_parse_from_str in datetime.rs to do the timezone mapping from %Z value to %z value.

Or add a wrapper to datetime_parse_from_str that is only used by process_dt in bin.rs. The wrapper does the timezone value mapping.

[jtmoon79]

Fixed by a71c5e8