git helpers

docs/src/content/docs/reference/scripts/git.md

@@ -0,0 +1,16 @@
+---
+title: Git
+description: git helpers
+sidebar:
+    order: 51
+---
+
+The `git` helper provides a thin wrapper around invoking the [git](https://git-scm.com/) executable.
+
+## defaultBranch
+
+Resolve the default branch, typically `main` or `master` in the repository.
+
+```js
+const df = await git.defaultBranch()
+```

packages/core/src/diff.ts

@@ -245,16 +245,22 @@
     return lines.filter((l) => l !== undefined).join("\n")
 }
 
-export function llmifyDiff(diff: string) {
-    if (!diff) return diff
-
+export function tryParseDiff(diff: string) {
     let parsed: parseDiff.File[]
     try {
         parsed = parseDiff(diff)
     } catch (e) {
         return undefined // probably not a diff
     }
+    return parsed
+}
+
+export function llmifyDiff(diff: string) {
+    if (!diff) return diff
+
+    const parsed = tryParseDiff(diff)
+    if (!parsed) return undefined
 
     for (const file of parsed) {
         for (const chunk of file.chunks) {
             let currentLineNumber = chunk.newStart