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) (row int) {
	win := state.Window().New(0, 0, 80, state.Window().Height)
	_, row = win.Wrap(vaxis.Segment{Text: `──── using the shell ────

`, Style: vaxis.Style{Foreground: vaxis.IndexColor(5)}}, vaxis.Segment{Text: `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 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.`},
	)
	return
}

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

	row := view.Draw(state)
	win := state.Window().New(0, row+2, 80, 80)

	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
}