add --delim custom delimiter option

[luckman212]

Hey @zmwangx 👋

Ets is an awesome tool, thank you for creating it! It's really helping me debug some stuff that needed millisecond-level accuracy in the timestamps.

One problem that I had was the delimiter of a single space was making it hard to integrate with some other logging tools that I also use. I wanted to use \t tab instead, but I went ahead and made this PR that adds a -d / --delim flag to allow any custom delimiter that might be desired.

Examples

ets --delim ' - '
ets -d '\t\t'
ets -d ':  '

One little neat trick you can do with this is create a delimiter that causes the terminal to beep when new lines are logged, e.g.

$ ping 1.1.1.1 | ets -d '\t\x07'

Hope this patch is ok, but let me know 👍

[gdubicki]

Hey @luckman212, please read #37. I would be happy to try to get your PR merged to that fork, if you recreate it there. :)

[luckman212]

@gdubicki Glad to see you've forked and are planning to maintain this! I dusted off the PR and applied it to your fork. I haven't tested yet whether it compiles but glancing at the diff it seems "ok". I will try to build and test later.