Adds a sparkle button to the SVN Source Control input (provided by johnstoncode.svn-scm) that generates a commit message from your working copy diff — the same UX as the built-in Git/Copilot button.

Requirements

VS Code 1.90+
svn-scm extension
svn CLI on your PATH
One of:
- GitHub Copilot (uses the VS Code Language Model API), or
- An Anthropic API key (stored in VS Code Secret Storage)

Usage

Open an SVN working copy.
Make some changes.
Click the sparkle (✨) icon in the SCM input toolbar, or run SVN AI: Generate Commit Message.

The message streams into the input box. Press Esc during generation to cancel — the input box is restored to whatever it was before.

Branch indicator

The status bar shows the branch the active working copy is switched to ($(git-branch) booking_dev). Click it — or run SVN AI: Switch Branch — to open a branch palette; picking an entry runs svn switch ^/branch/<name> in the working-copy root.

The list is read with svn list from the paths in svnAiCommit.branch.paths and cached for 5 minutes; the ↻ button in the palette reloads it (SVN AI: Refresh Branch List does the same).
Switch to another path or URL... accepts anything svn does: ^/branch/x, branch/x, or a full repository URL.
If the working copy has uncommitted changes you get a confirmation first, because a switch merges them into the target branch.
Unrelated locations need --ignore-ancestry; the extension detects that case and offers to retry.
The label follows switches made elsewhere (svn-scm, TortoiseSVN, a terminal) — it re-reads on window focus and when .svn/wc.db changes.

The default paths cover the two common layouts (^/trunk, ^/branches/*, ^/branch/*). Paths that do not exist are skipped, so a single setting works across repositories. To include tags, add ^/tags/*.

Configuration

All settings live under svnAiCommit.*:

Setting	Default	Description
`provider`	`auto`	`auto` \| `copilot` \| `anthropic`
`model.smart`	`""`	Override for aggregation / single-call model.
`model.fast`	`""`	Override for per-file summary model.
`maxConcurrency`	`5`	Parallel per-file calls (1–20).
`singleCallThresholdTokens`	`25000`	Below this, all diffs go in one call.
`perFileMaxTokens`	`6000`	Per-file truncation budget.
`maxDiffBytes`	`10485760`	Hard cap on `svn diff` stdout.
`style`	`plain`	`conventional` \| `plain` \| `custom`
`customStyleInstructions`	`""`	Used when `style = custom`.
`language`	`auto`	Output language (e.g. `en`, `fr`).
`includeBody`	`true`	Include a body section.
`maxBodyLines`	`8`	Cap body length.
`onExistingMessage`	`prompt`	`prompt` \| `replace` \| `append`
`branch.enabled`	`true`	Show the branch indicator in the status bar.
`branch.paths`	`["^/trunk", "^/branches/", "^/branch/"]`	Where branches live. A trailing `/*` lists one level below the path.
`branch.showFullPath`	`false`	Show `branch/booking_dev` instead of `booking_dev`.

Anthropic API key

Run SVN AI: Set Anthropic API Key. The key is stored in VS Code Secret Storage. To remove it, run SVN AI: Clear Anthropic API Key.

How it works

Shells out to svn diff --internal-diff (streams stdout, hard-capped by maxDiffBytes).
Splits the diff per file (Index: boundary), classifies each as text / binary / property-only / generated.
Routes:
- Total tokens under singleCallThresholdTokens → one call to the smart model with the full diff.
- Otherwise → fast model summarizes each text file in parallel, smart model aggregates.
Final smart-model call streams into the SCM input box.

How the branch switcher works

svn info --xml (local, no network) gives the current location; the branch label is <relative-url> with the configured container prefix stripped.
svn list --xml --non-interactive <url> enumerates each .../* path, up to 4 in parallel, 30s timeout each.
svn switch --non-interactive ^/<path> runs in the working-copy root. It is not cancellable: killing svn mid-switch leaves a working copy that needs svn cleanup.

Troubleshooting

"svn CLI not found" — Install Subversion and make sure svn is on your PATH.
"No AI provider available" — Install GitHub Copilot or set an Anthropic API key.
No sparkle button — Make sure johnstoncode.svn-scm is installed and the workspace folder is an SVN working copy.
First Copilot call blocked — Accept the Copilot Language Model consent dialog when prompted, then retry.
No branch indicator — The workspace folder (or a parent of it) must contain .svn. Check that svnAiCommit.branch.enabled is on and that the entry is not hidden via the status bar's right-click menu.
Empty branch list — svnAiCommit.branch.paths does not match your repository layout. Run svn list ^/ in the working copy to see the top-level directories.
Branch list times out or asks for credentials — Everything runs with --non-interactive. Run svn list <url> once in a terminal to cache credentials.

Out of scope (v0.2)

Creating or deleting branches, merging, per-changelist messages, pre-commit hooks, multi-repo per-repo config, real tokenizers, cross-session caching, other SCMs.