welcome/app/shell.go

package app

import (
	"os"
	"os/exec"

	"git.sr.ht/~rockorager/vaxis"
	"git.sr.ht/~rockorager/vaxis/widgets/term"
	"git.tilde.town/nbsp/welcome/ui"
)

type Shell struct {
	loaded bool
}

func (view *Shell) Draw(state *ui.State) {
	win := state.Window()
	win.Print(vaxis.Segment{Text: `                           ──── using the shell ────

as mentioned before, interaction with stuff on tilde town is done primarily via
the `},
		vaxis.Segment{Text: "terminal", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: `. good news, you've been using the terminal this whole time! it's
simply the text application with which you've been talking to the server so far.

the method of navigation between programs inside our shared computer, however,
is called a `},
		vaxis.Segment{Text: "shell", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: `. it's an interface that takes in commands, like "open a text
editor" or "show me my flower", in a language that doesn't take too long to get
used to. the most popular shell is called `},
		vaxis.Segment{Text: "bash", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: `, and while there are more,
there's no reason to switch unless you're looking for something different.

below is a terminal session. try typing `},
		vaxis.Segment{Text: "ls", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: ` to list a folder, or `},
		vaxis.Segment{Text: "echo", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: ` to make the
shell say anything you want it to. run `},
		vaxis.Segment{Text: "exit", Style: vaxis.Style{Foreground: vaxis.IndexColor(3)}},
		vaxis.Segment{Text: ` to continue the tutorial, whenever
you're ready.`},
	)
}

func (view *Shell) Event(state *ui.State, event vaxis.Event) (processed bool) {
	if view.loaded {
		return
	}
	view.loaded = true

	win := state.Window().New(0, 16, 80, 80)
	view.Draw(state)

	vt := term.New()
	vt.TERM = os.Getenv("TERM")
	vt.Attach(state.PostEvent())
	vt.Focus()
	err := vt.Start(exec.Command("bash", "-l"))
	if err != nil {
		panic(err)
	}
	defer vt.Close()

	for ev := range state.Events() {
		switch ev.(type) {
		case term.EventClosed:
			state.HideCursor()
			vt.Detach()
			vt.Close()
			state.Window().Clear()
			ui.ViewChange <- &Editor{}
			return
		case vaxis.Redraw:
			view.Draw(state)
			vt.Draw(win)
			state.Render()
			continue
		}

		vt.Update(ev)
	}

	return
}