Rename branch (#199)

This is more important now that import app is available and not every
git repo will be initialized with `main` as the default branch. This
handles the other common case which is the `master` branch.

src/hooks/useRenameBranch.ts

@@ -0,0 +1,58 @@
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { IpcClient } from "@/ipc/ipc_client";
+import { showError } from "@/lib/toast";
+import { selectedAppIdAtom } from "@/atoms/appAtoms";
+import { useAtomValue } from "jotai";
+
+interface RenameBranchParams {
+  appId: number;
+  oldBranchName: string;
+  newBranchName: string;
+}
+
+export function useRenameBranch() {
+  const queryClient = useQueryClient();
+  const currentAppId = useAtomValue(selectedAppIdAtom);
+
+  const mutation = useMutation<void, Error, RenameBranchParams>({
+    mutationFn: async (params: RenameBranchParams) => {
+      if (params.appId === null || params.appId === undefined) {
+        throw new Error("App ID is required to rename a branch.");
+      }
+      if (!params.oldBranchName) {
+        throw new Error("Old branch name is required.");
+      }
+      if (!params.newBranchName) {
+        throw new Error("New branch name is required.");
+      }
+      await IpcClient.getInstance().renameBranch(params);
+    },
+    onSuccess: (_, variables) => {
+      // Invalidate queries that depend on branch information
+      queryClient.invalidateQueries({
+        queryKey: ["currentBranch", variables.appId],
+      });
+      queryClient.invalidateQueries({
+        queryKey: ["versions", variables.appId],
+      });
+      // Potentially show a success message or trigger other actions
+    },
+    meta: {
+      showErrorToast: true,
+    },
+  });
+
+  const renameBranch = async (params: Omit<RenameBranchParams, "appId">) => {
+    if (!currentAppId) {
+      showError("No application selected.");
+      return;
+    }
+    return mutation.mutateAsync({ ...params, appId: currentAppId });
+  };
+
+  return {
+    renameBranch,
+    isRenamingBranch: mutation.isPending,
+    renameBranchError: mutation.error,
+  };
+}