Method handleCommands

tea.go:700–739

handleCommands runs commands in a goroutine and sends the result to the program's message channel.

(cmds chan Cmd)

// handleCommands runs commands in a goroutine and sends the result to the
// program's message channel.
func (p *Program) handleCommands(cmds chan Cmd) chan struct{} {
	ch := make(chan struct{})

	go func() {
		defer close(ch)

		for {
			select {
			case <-p.ctx.Done():
				return

			case cmd := <-cmds:
				if cmd == nil {
					continue
				}

				// Don't wait on these goroutines, otherwise the shutdown
				// latency would get too large as a Cmd can run for some time
				// (e.g. tick commands that sleep for half a second). It's not
				// possible to cancel them so we'll have to leak the goroutine
				// until Cmd returns.
				go func() {
					// Recover from panics.
					if !p.disableCatchPanics {
						defer func() {
							if r := recover(); r != nil {
								p.recoverFromPanic(r)
							}
						}()
					}

					msg := cmd() // this can be long.
					p.Send(msg)
				}()
			}
		}
	}()

	return ch
}

// eventLoop is the central message loop. It receives and handles the default
// Bubble Tea messages, update the model and triggers redraws.