using dlv no output fix (#25)

lua/go/dap.lua

@@ -73,22 +73,35 @@ M.run = function(...)
   end
   local dap = require "dap"
   dap.adapters.go = function(callback, config)
+    local stdout = vim.loop.new_pipe(false)
     local handle
     local pid_or_err
     local port = 38697
     handle, pid_or_err = vim.loop.spawn("dlv", {
+      stdio = {nil, stdout},
       args = {"dap", "-l", "127.0.0.1:" .. port},
       detached = true
     }, function(code)
+      stdout:close()
       handle:close()
-      print("Delve exited with exit code: " .. code)
+      if code ~= 0 then
+        print("Delve exited with exit code: ", code)
+      end
+    end)
+    assert(handle, "Error running dlv: " .. tostring(pid_or_err))
+    stdout:read_start(function (err, chunk)
+      assert(not err, err)
+      if chunk then
+        vim.schedule(function ()
+          require("dap.repl").append(chunk)
+        end)
+      end
     end)
     -- Wait 100ms for delve to start
     vim.defer_fn(function()
       dap.repl.open()
       callback({type = "server", host = "127.0.0.1", port = port})
     end, 100)
-
   end
 
   local dap_cfg = {