Add helper function for running jj commands

lua/jj_mini_diff/init.lua

@@ -2,6 +2,21 @@
 
 local M = {}
 
+-- Helper function to run jj commands
+local function _run_jj_command(args)
+  local cmd = "jj " .. table.concat(args, " ")
+  local handle = io.popen(cmd)
+  if not handle then
+    return nil, "Failed to run command: " .. cmd
+  end
+  local output = handle:read("*a")
+  local status = handle:close()
+  if not status then
+    return nil, "Command failed: " .. cmd
+  end
+  return output
+end
+
 function M.setup(opts)
   opts = opts or {}
   -- TODO: Implement configuration options