Open patch hunk editor for git add -p edit command

app/src/main/java/solutions/tretter/githugandroid/GitRuntime.kt

@@ -315,6 +315,21 @@ class GitRepositoryRuntime private constructor(
             return executeInteractiveRebaseEditorCommand(level, currentRepo, nativeGit, sandboxRoot, workingDir, invocation, message)
         }
 
+        if (invocation.kind == GitEditorCommandKind.PATCH_HUNK) {
+            val (updatedRepo, output) = GitSandboxEngine.applyPatchHunkEdit(currentRepo, message)
+            val newlyStagedPaths = updatedRepo.files.filter { updatedFile ->
+                updatedFile.staged && currentRepo.files.firstOrNull { it.name == updatedFile.name }?.staged != true
+            }.map { it.name }
+            if (newlyStagedPaths.isNotEmpty()) {
+                runGit(nativeGit, workingDir, listOf("add") + newlyStagedPaths)
+            }
+            val inspectedRepo = inspectSandbox(level).copy(
+                currentDir = updatedRepo.currentDir,
+                interactiveAddSession = updatedRepo.interactiveAddSession,
+            )
+            return inspectedRepo to output
+        }
+
         val messageFile = File(sandboxRoot, ".git/GITHUG_ANDROID_EDITMSG").apply {
             parentFile?.mkdirs()
             writeText(message)