implement pulse

[egonelbre]

-pulse 5s prints "." every 5 seconds

Fixes #10

[mfridman]

Thanks for submitting this. I'd like to think about this one..

Background:

We use this tparse tool in our CI pipeline (drone) to summarize a subset of our tests (500+). We also use the -dump flag to get everything from go test, the idea is we'd

1. get a summary
2. get the original lines of code below the summary

But, we recently switched to drone >1.0 and noticed that -dump adds minutes to the pipeline, likely because many lines are being printed at once..

So, the idea I was thinking is..

a mechanism that prints go test output (only when summary is at the bottom, default) as it's running instead of holding on to it..

and once EOF the tests, pkg summary, etc. will be printed.

---

this will solve the original problem a few users reported, where they weren't sure tparse was working or not.

so they could run something like tparse -all -follow and tparse would just print whatever is coming from go test ... and at the very end display summary

thoughts?

EDIT: on the flip side, maybe users don't want go test output at all, would would rather prefer a simple spinner or ........ to indicate it's working.

Maybe these two features could co-exist

[egonelbre]

The main reason for this basic pulse is that Travis kills the tests if there is no output for 10min. I do agree some diagnostic output would be nice as well, but that's a much larger change.