feat(struct_tags): add options support

lua/gopher/_utils/struct_tags.lua

@@ -0,0 +1,44 @@
+---@param option string
+local function option_to_tag(option)
+  return option:match "^(.-)="
+end
+
+---@param args string[]
+local function unwrap_if_needed(args)
+  if #args == 1 then
+    return vim.split(args[1], ",")
+  end
+  return args
+end
+
+local struct_tags = {}
+
+---@class gopher.StructTagsArgs
+---@field tags string
+---@field options string
+
+---@param args string[]
+---@return gopher.StructTagsArgs
+function struct_tags.parse_args(args)
+  args = unwrap_if_needed(args)
+
+  local tags, options = {}, {}
+  for _, v in pairs(args) do
+    if string.find(v, "=") then
+      table.insert(options, v)
+      table.insert(tags, option_to_tag(v))
+    else
+      table.insert(tags, v)
+    end
+  end
+
+  -- todo: it's incompatible with vim lower 0.12
+  tags = vim.list.unique(tags)
+  options = vim.list.unique(options)
+  return {
+    tags = table.concat(tags, ","),
+    options = table.concat(options, ","),
+  }
+end
+
+return struct_tags