feat: Adding --show-elapsed flag in spin command

[NucleoFusion]

Fixes #951

Changes

• adds a --show-elapsed flag that shows elapsed time.

	return fmt.Sprintf("(%dd %dh %dm)", days, hours, minutes)
	
	return fmt.Sprintf("(%dh %dm)", hours, minutes)
	
	return fmt.Sprintf("(%dm %ds)", minutes, seconds)

	return fmt.Sprintf("(%ds)", seconds)

These are the formats

[reitzig]

Does this provide enough additional value over plain Sprintf? 🤔

fmt.Sprintf("duration: %s", d)

[NucleoFusion]

Do you mean showing only the seconds? or formatting time.Now()?

[reitzig]

No, I mean formatting the duration. I realize we should round, but this:

var start = time.Now()
for true {
  time.Sleep(100 * time.Millisecond)
  fmt.Printf("%s\n", time.Since(start).Round(100*time.Millisecond))
}

creates output like

59.6s
59.7s
59.9s
1m0s
1m0.1s
1m0.2s
1m0.3s

Which is basically what you propose, sans the spaces. Hence my question, if you think the visual difference justifies the additional code.

(Not my call, just a thought.)

[NucleoFusion]

I was not aware of this format specifier.
I would say since Gum is reliant on being User Friendly and good looking.
a 10 line function would justify it. I could make the formatting better too, if you have something in mind.
Its up to you though. So let me know and Ill change it.