refactor: llm tools (#1675)

lua/avante/llm_tools/read_file.lua

@@ -0,0 +1,68 @@
+local Utils = require("avante.utils")
+local Base = require("avante.llm_tools.base")
+local Helpers = require("avante.llm_tools.helpers")
+
+---@class AvanteLLMTool
+local M = setmetatable({}, Base)
+
+M.name = "read_file"
+
+M.description =
+  "Read the contents of a file in current project scope. If the file content is already in the context, do not use this tool."
+
+M.enabled = function(opts)
+  if opts.user_input:match("@read_global_file") then return false end
+  for _, message in ipairs(opts.history_messages) do
+    if message.role == "user" then
+      local content = message.content
+      if type(content) == "string" and content:match("@read_global_file") then return false end
+      if type(content) == "table" then
+        for _, item in ipairs(content) do
+          if type(item) == "string" and item:match("@read_global_file") then return false end
+        end
+      end
+    end
+  end
+  return true
+end
+
+---@type AvanteLLMToolParam
+M.param = {
+  type = "table",
+  fields = {
+    {
+      name = "rel_path",
+      description = "Relative path to the file in current project scope",
+      type = "string",
+    },
+  },
+}
+
+---@type AvanteLLMToolReturn[]
+M.returns = {
+  {
+    name = "content",
+    description = "Contents of the file",
+    type = "string",
+  },
+  {
+    name = "error",
+    description = "Error message if the file was not read successfully",
+    type = "string",
+    optional = true,
+  },
+}
+
+---@type AvanteLLMToolFunc<{ rel_path: string }>
+function M.func(opts, on_log)
+  local abs_path = Helpers.get_abs_path(opts.rel_path)
+  if not Helpers.has_permission_to_access(abs_path) then return "", "No permission to access path: " .. abs_path end
+  if on_log then on_log("path: " .. abs_path) end
+  local file = io.open(abs_path, "r")
+  if not file then return "", "file not found: " .. abs_path end
+  local lines = Utils.read_file_from_buf_or_disk(abs_path)
+  local content = lines and table.concat(lines, "\n") or ""
+  return content, nil
+end
+
+return M