Function prevTab

tui/app.go:247–254

(t tab)

}

func prevTab(t tab) tab {
	for i, x := range tabOrder {
		if x == t {
			return tabOrder[(i-1+len(tabOrder))%len(tabOrder)]
		}
	}
	return tabHome
}

// shutdown kills the engine subprocess if one is running, then quits the
// Bubble Tea program. Idempotent — safe to call when no engine is running.