add shell

TODO

@@ -1,4 +1,3 @@
-- an introduction to the shell
 - editing your homepage
 - checking your mail
 - joining irc

app/settings.go

@@ -26,7 +26,8 @@ func (view *Settings) Event(state *ui.State, event vaxis.Event) (processed bool)
 			}
 		case "Enter":
 			if view.index == 3 {
-				ui.ViewChange <- &Introduction{}
+				// TODO: save settings
+				ui.ViewChange <- &Shell{}
 			}
 			if view.index < 3 {
 				view.index++

app/shell.go

@@ -0,0 +1,90 @@
+package app
+
+import (
+	"os/exec"
+
+	"git.sr.ht/~rockorager/vaxis"
+	"git.sr.ht/~rockorager/vaxis/widgets/term"
+	"git.tilde.town/nbsp/welcome/ui"
+)
+
+type Shell struct{}
+
+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 key, ok := event.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
+		switch key.String() {
+		case "Ctrl+c", "Ctrl+d":
+			close(ui.Quit)
+		case "Enter":
+			ui.ViewChange <- &Settings{}
+		}
+		processed = true
+	}
+	win := state.Window()
+
+	view.Draw(state)
+
+	vt := term.New()
+	vt.Draw(win.New(0, 15, 80, 80))
+	vt.Attach(state.PostEvent())
+	vt.Focus()
+	err := vt.Start(exec.Command("bash", "-i"))
+	if err != nil {
+		panic(err)
+	}
+	defer vt.Close()
+
+	for ev := range state.Events() {
+		switch ev.(type) {
+		case term.EventClosed:
+			state.HideCursor()
+			state.Window().Clear()
+			ui.ViewChange <- &Introduction{}
+			return
+		case vaxis.Redraw:
+			view.Draw(state)
+			vt.Draw(win.New(0, 15, 80, 80))
+			state.Render()
+			continue
+		}
+
+		// for some reason vaxis doubles all events for Press/Release so this just ignores releases
+		if key, ok := ev.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
+			vt.Update(ev)
+		}
+	}
+
+	return
+}