feat: fetch tool (#1196)

lua/avante/html2md.lua

@@ -0,0 +1,27 @@
+---@class AvanteHtml2Md
+---@field fetch_md fun(url: string): string
+local _html2md_lib = nil
+
+local M = {}
+
+---@return AvanteHtml2Md|nil
+function M._init_html2md_lib()
+  if _html2md_lib ~= nil then return _html2md_lib end
+
+  local ok, core = pcall(require, "avante_html2md")
+  if not ok then return nil end
+
+  _html2md_lib = core
+  return _html2md_lib
+end
+
+function M.setup() vim.defer_fn(M._init_html2md_lib, 1000) end
+
+function M.fetch_md(url)
+  local html2md_lib = M._init_html2md_lib()
+  if not html2md_lib then return "", "Failed to load avante_html2md" end
+
+  return html2md_lib.fetch_md(url)
+end
+
+return M