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>
41 lines
1.7 KiB
Modula-2
41 lines
1.7 KiB
Modula-2
module scrawl
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go 1.24.0
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require (
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github.com/charmbracelet/bubbletea v1.3.10
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github.com/charmbracelet/lipgloss v1.1.0
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github.com/charmbracelet/ssh v0.0.0-20250128164007-98fd5ae11894
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github.com/charmbracelet/wish v1.4.7
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)
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require (
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github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be // indirect
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github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
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github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
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github.com/charmbracelet/keygen v0.5.3 // indirect
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github.com/charmbracelet/log v0.4.1 // indirect
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github.com/charmbracelet/x/ansi v0.10.1 // indirect
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github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
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github.com/charmbracelet/x/conpty v0.1.0 // indirect
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github.com/charmbracelet/x/errors v0.0.0-20240508181413-e8d8b6e2de86 // indirect
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github.com/charmbracelet/x/term v0.2.1 // indirect
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github.com/charmbracelet/x/termios v0.1.0 // indirect
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github.com/creack/pty v1.1.21 // indirect
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github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
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github.com/go-logfmt/logfmt v0.6.0 // indirect
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github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
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github.com/mattn/go-isatty v0.0.20 // indirect
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github.com/mattn/go-localereader v0.0.1 // indirect
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github.com/mattn/go-runewidth v0.0.16 // indirect
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github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
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github.com/muesli/cancelreader v0.2.2 // indirect
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github.com/muesli/termenv v0.16.0 // indirect
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github.com/rivo/uniseg v0.4.7 // indirect
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github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
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golang.org/x/crypto v0.36.0 // indirect
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golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
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golang.org/x/sys v0.36.0 // indirect
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golang.org/x/text v0.23.0 // indirect
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)
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