From 9db5931af1293ae52500921d92c02145d86df02c Mon Sep 17 00:00:00 2001
From: Smirnov Oleksandr <ss2316544@gmail.com>
Date: Thu, 3 Apr 2025 16:52:38 +0300
Subject: [PATCH] fix(impl): not error if no args provided (#110)

* fix(impl): handle case with no arguments provided

* fix(config): validate missing field
---
 lua/gopher/config.lua |  1 +
 lua/gopher/impl.lua   | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lua/gopher/config.lua b/lua/gopher/config.lua
index b8e4a15..b8f291e 100644
--- a/lua/gopher/config.lua
+++ b/lua/gopher/config.lua
@@ -84,6 +84,7 @@ function config.setup(user_config)
   vim.validate {
     log_level = { _config.log_level, "number" },
     timeout = { _config.timeout, "number" },
+    installer_timeout = { _config.installer_timeout, "number" },
     ["commands"] = { _config.commands, "table" },
     ["commands.go"] = { _config.commands.go, "string" },
     ["commands.gomodifytags"] = { _config.commands.gomodifytags, "string" },
diff --git a/lua/gopher/impl.lua b/lua/gopher/impl.lua
index 702d58e..b8b115a 100644
--- a/lua/gopher/impl.lua
+++ b/lua/gopher/impl.lua
@@ -44,7 +44,10 @@ function impl.impl(...)
   local iface, recv = "", ""
   local bufnr = vim.api.nvim_get_current_buf()
 
-  if #args == 1 then -- :GoImpl io.Reader
+  if #args == 0 then
+    u.notify("arguments not provided. usage: :GoImpl f *File io.Reader", vim.log.levels.ERROR)
+    return
+  elseif #args == 1 then -- :GoImpl io.Reader
     local st = ts_utils.get_struct_under_cursor(bufnr)
     iface = args[1]
     recv = string.lower(st.name) .. " *" .. st.name
@@ -57,7 +60,11 @@ function impl.impl(...)
     iface = args[3]
   end
 
-  local rs = r.sync { c.impl, "-dir", vim.fn.fnameescape(vim.fn.expand "%:p:h"), recv, iface }
+  assert(iface ~= "", "interface not provided")
+  assert(recv ~= "", "receiver not provided")
+
+  local dir = vim.fn.fnameescape(vim.fn.expand "%:p:h")
+  local rs = r.sync { c.impl, "-dir", dir, recv, iface }
   if rs.code ~= 0 then
     error("failed to implement interface: " .. rs.stderr)
   end