feat: add copy path button to diff headers

[ipanasenko]

Hey guys!

I find myself in a need to copy a file path from diff view quite often. I use it to paste into the chat and ask questions about this specific file. I think it makes it much more obvious for model (and for me) what file we are talking about.

Currently the best workflow in T3 Code I found for copying file path is to manually select file path and do Cmd+C. I think this can be improved by adding a copy button, GitHub-style.

Summary

• add a copy-path button to diff file headers using the Diffs renderHeaderMetadata slot

Note

Add copy path button to diff file headers

• Adds a DiffFilePathCopyButton component that copies a file path to the clipboard and shows an anchored toast near the button for success or error states.
• Extends AnnotatableCodeView with a renderHeaderFilenameSuffix callback and wires it up in DiffPanel to render the copy button in each diff header.
• Extracts shared anchored toast logic into anchoredCopyToast.ts, refactoring MessageCopyButton to use the shared utilities.
• Bumps @pierre/diffs from 1.3.0-beta.5 to 1.3.0-beta.7; the updated patch removes forced overrides of enableGutterUtility, enableLineSelection, and lineHoverHighlight, so the editor now respects consumer-provided values for these options.

^{Macroscope summarized c7dcbe0.}

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Note

Medium Risk
Touches the patched diff viewer’s gutter/line-selection behavior via a dependency bump; regressions could affect review comments or diff editing, though changes are localized to copy UI and option passthrough.

Overview
Adds a GitHub-style copy path control on each diff file header so users can paste paths into chat without manually selecting text.

Introduces DiffFilePathCopyButton and threads it through AnnotatableCodeView via a new required renderHeaderFilenameSuffix prop; DiffPanel supplies the button with resolveFileDiffPath. Copy feedback uses shared anchored toasts in anchoredCopyToast.ts, and MessageCopyButton is refactored to use the same helpers.

Upgrades @pierre/diffs to 1.3.0-beta.7 with an updated patch: the editor no longer forces enableGutterUtility / enableLineSelection off, and gutter pointerdown bails when line selection is enabled—so review comment line selection keeps working alongside the new header slot.

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[macroscopeapp]

Approvability

Verdict: Approved

Small UI feature adding a copy path button to diff headers. The implementation reuses existing clipboard and toast patterns, with clean extraction of shared toast utilities. The dependency bump is a minor beta version update.

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Dismissing prior approval to re-evaluate b028ddf

[juliusmarminge]

I'd left align them after the path, like Github:

[ipanasenko]

From what I see, to achieve this we'd need to use renderCustomHeader prop, and construct whole header manually. Are you okay with that?
Or am I missing something in diffs docs? 👀

Dismissing prior approval to re-evaluate a29ebac

Dismissing prior approval to re-evaluate d701d82

[juliusmarminge]

you can patch in a slot for it? they'll add it soon:

[juliusmarminge]

nvm should already exist:

[ipanasenko]

So, metadata slot is exactly what I used, and it rendered copy button at the very end 🤷‍♂️

Need something like postfix/suffix slot to be able to place button right after the path.

[ipanasenko]

👀 pierrecomputer/pierre#874
Waiting for this to be shipped

Dismissing prior approval to re-evaluate 1324094

[ipanasenko]

@juliusmarminge I've bumped @pierre/diffs to 1.3.0-beta.7, it includes renderHeaderFilenameSuffix prop - used it to render Copy after file name instead of metadata slot. Updated screenshots in PR description