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feat(tui): add PI_DEBUG_REDRAW=1 env var for debugging full redraws

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Logs redraw triggers to ~/.pi/agent/pi-debug.log when enabled.
This commit is contained in:
Mario Zechner 2026-02-02 08:39:57 +01:00
parent 0925fafe3b
commit 0d934091f4
1 changed files with 13 additions and 0 deletions
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13
packages/tui/src/tui.ts
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@ -867,14 +867,24 @@ export class TUI extends Container {
this.previousWidth = width; this.previousWidth = width;
}; };
const debugRedraw = process.env.PI_DEBUG_REDRAW === "1";
const logRedraw = (reason: string): void => {
if (!debugRedraw) return;
const logPath = path.join(os.homedir(), ".pi", "agent", "pi-debug.log");
const msg = `[${new Date().toISOString()}] fullRender: ${reason} (prev=${this.previousLines.length}, new=${newLines.length}, height=${height})\n`;
fs.appendFileSync(logPath, msg);
};
// First render - just output everything without clearing (assumes clean screen) // First render - just output everything without clearing (assumes clean screen)
if (this.previousLines.length === 0 && !widthChanged) { if (this.previousLines.length === 0 && !widthChanged) {
logRedraw("first render");
fullRender(false); fullRender(false);
return; return;
} }
// Width changed - full re-render (line wrapping changes) // Width changed - full re-render (line wrapping changes)
if (widthChanged) { if (widthChanged) {
logRedraw(`width changed (${this.previousWidth} -> ${width})`);
fullRender(true); fullRender(true);
return; return;
} }
@ -883,6 +893,7 @@ export class TUI extends Container {
// (overlays need the padding, so only do this when no overlays are active) // (overlays need the padding, so only do this when no overlays are active)
// Configurable via setClearOnShrink() or PI_CLEAR_ON_SHRINK=0 env var // Configurable via setClearOnShrink() or PI_CLEAR_ON_SHRINK=0 env var
if (this.clearOnShrink && newLines.length < this.maxLinesRendered && this.overlayStack.length === 0) { if (this.clearOnShrink && newLines.length < this.maxLinesRendered && this.overlayStack.length === 0) {
logRedraw(`clearOnShrink (maxLinesRendered=${this.maxLinesRendered})`);
fullRender(true); fullRender(true);
return; return;
} }
@ -931,6 +942,7 @@ export class TUI extends Container {
// Clear extra lines without scrolling // Clear extra lines without scrolling
const extraLines = this.previousLines.length - newLines.length; const extraLines = this.previousLines.length - newLines.length;
if (extraLines > height) { if (extraLines > height) {
logRedraw(`extraLines > height (${extraLines} > ${height})`);
fullRender(true); fullRender(true);
return; return;
} }
@ -961,6 +973,7 @@ export class TUI extends Container {
const previousContentViewportTop = Math.max(0, this.previousLines.length - height); const previousContentViewportTop = Math.max(0, this.previousLines.length - height);
if (firstChanged < previousContentViewportTop) { if (firstChanged < previousContentViewportTop) {
// First change is above previous viewport - need full re-render // First change is above previous viewport - need full re-render
logRedraw(`firstChanged < viewportTop (${firstChanged} < ${previousContentViewportTop})`);
fullRender(true); fullRender(true);
return; return;
} }