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Add smart auto-scroll to terminal output #4

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Merged
tsconfigdotjson merged 1 commit into from
Apr 10, 2026
Merged

Add smart auto-scroll to terminal output #4

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11 changes: 10 additions & 1 deletion Sources/DevtailKit/TerminalOutputView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,13 @@ private struct TerminalNSView: NSViewRepresentable {
func update(buffer: TerminalBuffer, fontSize: CGFloat) {
guard let textView else { return }
guard let storage = textView.textStorage else { return }
guard let scrollView = textView.enclosingScrollView else { return }

// Check if we're at (or near) the bottom before updating content.
// If so, follow new output. If the user scrolled up, stay put.
let clipView = scrollView.contentView
let maxScrollY = max(textView.frame.height - clipView.bounds.height, 0)
let isAtBottom = clipView.bounds.origin.y >= maxScrollY - 20

ensureFontCache(fontSize: fontSize)
let attrStr = buildAttributedString(buffer: buffer, fontSize: fontSize)
Expand All @@ -82,7 +89,9 @@ private struct TerminalNSView: NSViewRepresentable {
storage.setAttributedString(attrStr)
storage.endEditing()

textView.scrollToEndOfDocument(nil)
if isAtBottom {
textView.scrollToEndOfDocument(nil)
}
}

private func ensureFontCache(fontSize: CGFloat) {
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