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fix(respawn): use screen -X stuff for reliable input delivery

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When writing to an attached PTY connected to screen, the input doesn't
reliably reach Claude CLI. This fix uses `screen -X stuff` command to
send input directly to the screen session, bypassing the PTY attachment.

Research findings:
- Claude CLI uses Ink (React for CLI) for terminal UI
- Ink's parseKeypress detects \r as key.return (Enter)
- screen -X stuff with $'...' syntax reliably sends literal characters

Changes:
- Add ScreenManager.sendInput() using screen -X stuff
- Modify Session.write() to prefer screen -X stuff when available
- Keep \r as Enter key (what Ink expects for key.return)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-01-19 15:33:04 +01:00
co-authored by Claude Opus 4.5
parent 39c4a15ff3
commit a0fc82222f
3 changed files with 37 additions and 4 deletions
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src/respawn-controller.ts
+4 -4
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@@ -355,7 +355,7 @@ export class RespawnController extends EventEmitter {
this.stepTimer = setTimeout(() => {
const prompt = this.config.kickstartPrompt!;
this.log(`Sending kickstart prompt: "${prompt}"`);
this.session.write(prompt + '\r'); // \r for PTY Enter key
this.session.write(prompt + '\r'); // \r triggers key.return in Ink/Claude CLI
this.emit('stepSent', 'kickstart', prompt);
this.setState('waiting_kickstart');
this.promptDetected = false;
@@ -416,7 +416,7 @@ export class RespawnController extends EventEmitter {
this.terminalBuffer = ''; // Clear buffer for fresh detection
this.stepTimer = setTimeout(() => {
const input = this.config.updatePrompt + '\r'; // \r for PTY Enter key
const input = this.config.updatePrompt + '\r\n'; // CRLF for screen + Claude CLI
this.log(`Sending update prompt: "${this.config.updatePrompt}"`);
this.session.write(input);
this.emit('stepSent', 'update', this.config.updatePrompt);
@@ -432,7 +432,7 @@ export class RespawnController extends EventEmitter {
this.stepTimer = setTimeout(() => {
this.log('Sending /clear');
this.session.write('/clear\r'); // \r for PTY Enter key
this.session.write('/clear\r\n'); // CRLF for screen + Claude CLI
this.emit('stepSent', 'clear', '/clear');
this.setState('waiting_clear');
this.promptDetected = false;
@@ -445,7 +445,7 @@ export class RespawnController extends EventEmitter {
this.stepTimer = setTimeout(() => {
this.log('Sending /init');
this.session.write('/init\r'); // \r for PTY Enter key
this.session.write('/init\r\n'); // CRLF for screen + Claude CLI
this.emit('stepSent', 'init', '/init');
this.setState('waiting_init');
this.promptDetected = false;