add filtering based on time about node-bunyan

[trentm]

Heh, I had these (in separate places) in my notes:

bunyan -s|--start 5m     # start 5 min ago
bunayn -s time=5m

The idea with the latter one is a more generic "start" option that would potentially eventually allow something like this:

bunyan -s req_id=$uuid

That would scan back through the log file(s) looking for the first record with that req_id field (with some max time/num-records/size back as a guard).

Anyway, that is vapourware, so ignoring.

your proposal

bunyan -t 5s
bunayn -t 5     # presumption is 5 *seconds*

What about this to get the last N lines:

bunyan -t 5l     # that's a lowercase "L"; last 5 *lines*

RobG recently added napictl lastlog to get the last N logs, so there is a valid use case there I think. And if we did add support for this, what about (a) the mnemonic is not "time", but "tail", and (b) the default would be lines. The "l" is weird as a suffix, so I'd just drop that.

bunyan --tail     # last 10 lines (where by "lines" I mean log records)
bunyan -t          # ditto
bunyan -t 5       # last 5 lines
bunyan -t 5s     # last 5 seconds
bunyan -t 5m    # last 5 minutes

Thoughts?

Also, your patch was clipped at 80 columns, cutting off some of your usage text. Can you resubmit that?

[chakrit]

FWIW I made this little utility for myself: https://github.com/chakrit/bunyan-reltime

[trentm]

@chakrit Nice! Thanks for the note.