refactor(git): extract repo.resolve_cwd helper

lua/git/repo.lua

@@ -83,6 +83,18 @@ local function resolve(path)
     return vim.fs.normalize(gitdir), worktree
 end
 
+---Resolve the gitdir/worktree from the current buffer's file path, falling
+---back to `vim.fn.getcwd()` when the buffer is unnamed. Returns nil for
+---both when not inside a git repo.
+---@return string?, string?  gitdir, worktree
+local function resolve_cwd()
+    local path = vim.api.nvim_buf_get_name(0)
+    if path == "" then
+        path = vim.fn.getcwd()
+    end
+    return resolve(path)
+end
+
 ---@class ow.Git.Repo
 ---@field gitdir string
 ---@field worktree string
@@ -312,6 +324,7 @@ return {
     indicator = indicator,
     refresh_buf = refresh_buf,
     resolve = resolve,
+    resolve_cwd = resolve_cwd,
     rev_parse = rev_parse,
     stop_all = stop_all,
     unregister = unregister,