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feat: enable local echo overlay for OpenCode sessions

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Use a cursor-based prompt finder for OpenCode's Bubble Tea TUI:
- Custom finder locates ┃ (U+2503) border on the cursor's row
- Offset 3 skips "┃  " to reach the text input start position
- Prompt finder is swapped dynamically when switching between
  Claude (❯ character) and OpenCode (┃ border) sessions
- Added setPrompt() method to ZerolagInputAddon for runtime updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
arkon
2026-02-26 10:53:26 +01:00
co-authored by Claude Opus 4.6
parent c6d4294dde
commit eba2fa32a3
1 changed files with 31 additions and 4 deletions
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src/web/public/app.js
+31 -4
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@@ -2005,6 +2005,8 @@ class ZerolagInputAddon {
resetBufferDetection() { this._bufferDetectDone = false; }
undoDetection() { this._flushedOffset = 0; this._flushedText = ''; this._bufferDetectDone = false; }
suppressBufferDetection() { this._bufferDetectDone = true; }
/** Update the prompt finder at runtime (e.g., when switching between Claude and OpenCode sessions) */
setPrompt(finder) { this._options.prompt = finder; this._lastPromptPos = null; }
findPrompt() {
if (!this._terminal) return null;
return _zl_findPrompt(this._terminal, this._options.prompt ?? _ZL_DEFAULT_PROMPT);
@@ -3622,14 +3624,39 @@ class ClaudemanApp {
const settings = this.loadAppSettingsFromStorage();
const session = this.activeSessionId ? this.sessions.get(this.activeSessionId) : null;
const echoEnabled = settings.localEchoEnabled ?? MobileDetection.isTouchDevice();
// Disable local echo for OpenCode sessions — Bubble Tea TUI has no '>' prompt
// for the overlay to anchor to, so keystrokes buffer invisibly
const isOpenCode = session?.mode === 'opencode';
const shouldEnable = !!(echoEnabled && session && !isOpenCode);
const shouldEnable = !!(echoEnabled && session);
if (this._localEchoEnabled && !shouldEnable) {
this._localEchoOverlay?.clear();
}
this._localEchoEnabled = shouldEnable;
// Swap prompt finder based on session mode
if (this._localEchoOverlay && session) {
if (session.mode === 'opencode') {
// OpenCode (Bubble Tea TUI): find the ┃ border on the cursor's row.
// The input area is "┃ <text>" — the ┃ is the anchor, offset 3 skips "┃ ".
// We use the cursor row (cursorY) to find the right line, then scan for ┃.
this._localEchoOverlay.setPrompt({
type: 'custom',
offset: 3,
find: (terminal) => {
try {
const buf = terminal.buffer.active;
const row = buf.cursorY;
const line = buf.getLine(buf.viewportY + row);
if (!line) return null;
const text = line.translateToString(true);
const idx = text.indexOf('\u2503'); // ┃ (BOX DRAWINGS HEAVY VERTICAL)
if (idx >= 0) return { row, col: idx };
return null;
} catch { return null; }
}
});
} else {
// Claude Code: scan for ❯ prompt character
this._localEchoOverlay.setPrompt({ type: 'character', char: '\u276f', offset: 2 });
}
}
}
/**