feat(go): enhanced document search with lsp

lua/gx/handlers/go.lua

@@ -5,18 +5,59 @@ local M = {
   filename = nil,
 }
 
+local function is_import_spec(node)
+  return node:type() == "import_spec"
+end
+
+local function is_gopls_attached()
+  return #vim.lsp.get_clients({ name = "gopls" }) > 0
+end
+
+local function request_hover_info()
+  local method = "textDocument/hover"
+  local params = vim.lsp.util.make_position_params()
+  -- The default timeout is 1000ms
+  return vim.lsp.buf_request_sync(0, method, params)
+end
+
+-- TODO check if it is an internal pkg
+local function get_link_from_response(res_tbl)
+  local res = res_tbl[1]
+  if res and res.result then
+    local value = res.result.contents.value
+    return value:match("https://pkg%.go%.dev[%w.#/]+")
+  end
+  return nil
+end
+
 function M.handle()
   local node = vim.treesitter.get_node()
   if not node then
     return
   end
-  if node:type() ~= "import_spec" then
+
+  if not is_import_spec(node) then
     if node:type() == "import_declaration" then
       node = node:named_child(0)
     else
       node = node:parent()
     end
-    if node:type() ~= "import_spec" then
+
+    if not is_import_spec(node) then
+      if not is_gopls_attached() then
+        return
+      end
+
+      local res_tbl, err = request_hover_info()
+      if err or not res_tbl or vim.tbl_isempty(res_tbl) then
+        return
+      end
+
+      local link = get_link_from_response(res_tbl)
+      if link then
+        return link
+      end
+
       return
     end
   end