2b8c3ae6ee
ssh in and draw on a live, shared doodle wall -- everyone connected sees everyone else's edits in real time. Same wish+bubbletea security model as delve-term (no shell, no exec, structurally can't reach a real shell on the host), extended with the one thing delve-term didn't need: multiple sessions sharing live state. wish's bm.Middleware helper hides the *tea.Program it creates, so this builds the program directly instead, keeping a registry (game.Canvas) that broadcasts a redraw signal to every other connected session the instant one of them paints. Banner generated via `figlet -f slant SCRAWL` rather than hand-drawn -- slant felt right for a doodle/scribble tool. Two real bugs caught by actually running this with real SSH sessions, not just unit-testing the game logic in isolation: 1. Program.Send() blocks until that program's Run() event loop is actively reading from it. Broadcasting synchronously from inside Join()/Paint() (including a session broadcasting to its own, not-yet-running program on join) deadlocked every session before it ever reached Run() -- the very first connection just hung with nothing rendered. Fixed by sending asynchronously (go p.Send(...)) everywhere the canvas notifies sessions of a change. 2. Subtler: lipgloss's default package-level styles detect color support from the *server process's* os.Stdout, not any given session's actual terminal -- and a server's stdout is typically redirected (a log file, systemd journal), so every connected session silently lost all color/background styling at once, server-wide. Manifested as painting a cell your own cursor already sat on being invisible (the cursor glyph before/after looked identical, so bubbletea's diffing renderer correctly sent zero bytes for a change that produced no visual diff) -- confirmed via server-side debug logging that painting itself worked correctly every time, isolating the bug to rendering, then confirmed via a Go test that forcing a real color profile was the difference between 0 and 1327 runes of diff between two frames that should look different. Fixed with a lipgloss.Renderer created per-session, bound to that session's actual output, forced to TrueColor; cursors now highlight whatever's already painted at that cell (background tint) rather than replacing the character, so a session's own paint is never masked by its own cursor marker sitting on top of it. Verified end-to-end with two real, simultaneous SSH sessions (scripted via pexpect): peer count syncs correctly, and one session's paint genuinely arrives at the other via the live broadcast -- not just unit-tested in isolation. Also verified the actual Docker image builds and serves correctly over real SSH. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
96 lines
2.2 KiB
Go
96 lines
2.2 KiB
Go
package game
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import (
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tea "github.com/charmbracelet/bubbletea"
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"github.com/charmbracelet/lipgloss"
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)
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var inkPalette = []string{"#ff6b6b", "#feca57", "#1dd1a1", "#54a0ff", "#ff9ff3", "#48dbfb", "#f368e0", "#ffffff"}
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var charPalette = []rune{'█', '▓', '▒', '░', '#', '*', '.', '@', 'o', '+'}
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type state int
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const (
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stateIntro state = iota
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stateCanvas
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)
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type Model struct {
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canvas *Canvas
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id string
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label string
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state state
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renderer *lipgloss.Renderer
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inkColorIdx int
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charIdx int
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width, height int
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}
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func NewModel(canvas *Canvas, id, label string, renderer *lipgloss.Renderer) Model {
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return Model{canvas: canvas, id: id, label: label, state: stateIntro, renderer: renderer}
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}
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func (m Model) Init() tea.Cmd { return nil }
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func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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switch msg := msg.(type) {
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case tea.WindowSizeMsg:
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m.width, m.height = msg.Width, msg.Height
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return m, nil
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case canvasUpdatedMsg:
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// Someone (possibly this session) changed the shared state --
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// nothing to do here but re-render; View() always reads a fresh
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// snapshot from the canvas.
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return m, nil
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case tea.KeyMsg:
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if m.state == stateIntro {
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m.state = stateCanvas
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return m, nil
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}
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return m.handleKey(msg)
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}
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return m, nil
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}
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func (m Model) handleKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
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switch msg.String() {
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case "ctrl+c", "q":
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return m, tea.Quit
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case "up", "k":
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m.canvas.MoveCursor(m.id, 0, -1)
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case "down", "j":
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m.canvas.MoveCursor(m.id, 0, 1)
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case "left", "h":
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m.canvas.MoveCursor(m.id, -1, 0)
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case "right", "l":
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m.canvas.MoveCursor(m.id, 1, 0)
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case " ", "enter":
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if cur, ok := m.canvas.CursorsSnapshot()[m.id]; ok {
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m.canvas.Paint(cur.X, cur.Y, charPalette[m.charIdx], inkPalette[m.inkColorIdx])
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}
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case "backspace", "delete":
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if cur, ok := m.canvas.CursorsSnapshot()[m.id]; ok {
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m.canvas.Paint(cur.X, cur.Y, ' ', "")
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}
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case "[":
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m.charIdx = (m.charIdx - 1 + len(charPalette)) % len(charPalette)
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case "]":
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m.charIdx = (m.charIdx + 1) % len(charPalette)
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case "1", "2", "3", "4", "5", "6", "7", "8":
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m.inkColorIdx = int(msg.String()[0] - '1')
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case "c":
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m.canvas.Clear()
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}
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return m, nil
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}
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