What is the easiest way to transit between programs? (state machine)

[Dentrax]

Hey, thanks for awesome project.

I've created 2 different tea.Program:

1. program1: Just a simple spinner (that included in examples already)
2. program2: Full screen program (tea.WithAltScreen()).

What I want to do is to move the current state (program1, which is state1) to (program2, which is state2). I've written the following pseudo code:

loading := newProgram1()
go loading.Start()

myHeavyWorkFuncThatTakes10Sec()

loading.Kill()

actual := newProgram2()
actual.Start()

I simply call Start() func in the background and start my task that handle some stuff. When it gets done, I'm Kill()ing the loading and start my actual program.

But it seems does not work. It gets stuck in loading state. I've to send one of interruption messages (esc, q, ctrl+c), to move (transit? i'm not sure which keyword is right in this context) to next state.

My use-case is to make a simple loading indicator during initializing the actual program. Are there any multi-program example around?

[bashbunni]

Hey @Dentrax any particular reason you want it to be two separate programs? You could have a field in your model that's something like

type model struct {
  ...
  loaded bool
}

wherein you set m.loaded to true when you receive a tea.WindowSizeMsg. Then in your View you can choose to only show the spinner if !m.loaded. Let me know if hat's enough context, if not, I can work on finding a suitable example that does this

[bashbunni]

Basically what will happen is that it will render your View when the program starts, then it will re-render when the tea.WindowSizeMsg is received. So you can easily have your View display a loading screen while the program starts up

[Grubba27]

Hey @bashbunni, I ran into the same problem as @Dentrax.
While I was following the kancli video tutorial. I wanted to change the "loading...." with something more glamorous™ I've made this repo, to resume my story I've copied the example of a simple spinner but when I run the CLI it does not tickle :(

Also, is there any particular reason it takes time to load the UI? Sometimes it is fast, as seen by the video; other times, it just keeps loading.

Screen.Recording.2022-10-24.at.00.57.47.mov

---

Ps: You guys are doing some awesome work! Saw the YouTube tutorial and the changelog podcast, I'm learning go just to write really good looking CLIs

(edit): just realized that ended recording before showing one time it was quick :/ but here is a screenshot of one time it ran in 3s

My neofetch if the issue for taking some time to load is related to my OS

[bashbunni]

I'm curious about this too. It should just be waiting on the WindowSizeMsg from the terminal, so I'm not sure either why it takes so long. Might be something that @muesli or @meowgorithm will be able to help with 🤔 (Muesli and Meow, feel free to ping me if you need to see an example). You can reproduce by running the kancli main.go

[bashbunni]

@Grubba27 I'll create an issue in kancli so it's easier to track!

[bab014]

Experiencing the same delay and it's not consistent. Sometimes it just sits like it's loading, but the spinner is not spinning then my list pops up. Other times it starts right up and I get my list items no problem.