refactor & fix: improve libraries initialization (#921)

* refactor(libs): extract libraries initialization

Extract initialization logic into separate functions
for better error handling and reusability.

* fix(libs): improve core libraries init

This change helps prevent runtime errors from uninitialized libraries.

lua/avante/path.lua

@@ -178,6 +178,22 @@ end
 
 P.repo_map = RepoMap
 
+---@return AvanteTemplates|nil
+P._init_templates_lib = function()
+  if templates ~= nil then
+    return templates
+  end
+  local ok, module = pcall(require, "avante_templates")
+  ---@cast module AvanteTemplates
+  ---@cast ok boolean
+  if not ok then
+    return nil
+  end
+  templates = module
+
+  return templates
+end
+
 P.setup = function()
   local history_path = Path:new(Config.history.storage_path)
   if not history_path:exists() then history_path:mkdir({ parents = true }) end
@@ -191,16 +207,10 @@ P.setup = function()
   if not data_path:exists() then data_path:mkdir({ parents = true }) end
   P.data_path = data_path
 
-  vim.defer_fn(function()
-    local ok, module = pcall(require, "avante_templates")
-    ---@cast module AvanteTemplates
-    ---@cast ok boolean
-    if not ok then return end
-    if templates == nil then templates = module end
-  end, 1000)
+  vim.defer_fn(P._init_templates_lib, 1000)
 end
 
-P.available = function() return templates ~= nil end
+P.available = function() return P._init_templates_lib() ~= nil end
 
 P.clear = function()
   P.cache_path:rm({ recursive = true })

lua/avante/repo_map.lua

@@ -15,16 +15,23 @@ local repo_map_lib = nil
 ---@class avante.utils.repo_map
 local RepoMap = {}
 
-function RepoMap.setup()
-  vim.defer_fn(function()
-    local ok, core = pcall(require, "avante_repo_map")
-    if not ok then
-      error("Failed to load avante_repo_map")
-      return
+---@return AvanteRepoMap|nil
+function RepoMap._init_repo_map_lib()
+  if repo_map_lib ~= nil then
+    return repo_map_lib
   end
 
-    if repo_map_lib == nil then repo_map_lib = core end
-  end, 1000)
+  local ok, core = pcall(require, "avante_repo_map")
+  if not ok then
+    return nil
+  end
+
+  repo_map_lib = core
+  return repo_map_lib
+end
+
+function RepoMap.setup()
+  vim.defer_fn(RepoMap._init_repo_map_lib, 1000)
 end
 
 function RepoMap.get_ts_lang(filepath)
@@ -51,12 +58,13 @@ function RepoMap._build_repo_map(project_root, file_ext)
   local negate_patterns = vim.list_extend(gitignore_negate_patterns, Config.repo_map.negate_patterns)
 
   local filepaths = Utils.scan_directory(project_root, ignore_patterns, negate_patterns)
-  vim.iter(filepaths):each(function(filepath)
-    if not Utils.is_same_file_ext(file_ext, filepath) then return end
-    if not repo_map_lib then
+  if filepaths and not RepoMap._init_repo_map_lib() then
+    -- or just throw an error if we don't want to execute request without codebase
     Utils.error("Failed to load avante_repo_map")
     return
   end
+  vim.iter(filepaths):each(function(filepath)
+    if not Utils.is_same_file_ext(file_ext, filepath) then return end
     local filetype = RepoMap.get_ts_lang(filepath)
     local definitions = filetype
         and repo_map_lib.stringify_definitions(filetype, Utils.file.read_content(filepath) or "")

lua/avante/tokenizers.lua

@@ -5,20 +5,38 @@ local Utils = require("avante.utils")
 ---@field encode fun(string): integer[]
 local tokenizers = nil
 
+---@type "gpt-4o" | string
+local current_model = "gpt-4o"
+
 local M = {}
 
+---@param model "gpt-4o" | string
+---@return AvanteTokenizer|nil
+M._init_tokenizers_lib = function(model)
+  if tokenizers ~= nil then
+    return tokenizers
+  end
+
+  local ok, core = pcall(require, "avante_tokenizers")
+  if not ok then
+    return nil
+  end
+
+  ---@cast core AvanteTokenizer
+  tokenizers = core
+
+  core.from_pretrained(model)
+
+  return tokenizers
+end
+
 ---@param model "gpt-4o" | string
 ---@param warning? boolean
 M.setup = function(model, warning)
+  current_model = model
   warning = warning or true
   vim.defer_fn(function()
-    local ok, core = pcall(require, "avante_tokenizers")
-    if not ok then return end
-
-    ---@cast core AvanteTokenizer
-    if tokenizers == nil then tokenizers = core end
-
-    core.from_pretrained(model)
+    M._init_tokenizers_lib(model)
   end, 1000)
 
   if warning then
@@ -32,11 +50,11 @@ M.setup = function(model, warning)
   end
 end
 
-M.available = function() return tokenizers ~= nil end
+M.available = function() return M._init_tokenizers_lib(current_model) ~= nil end
 
 ---@param prompt string
 M.encode = function(prompt)
-  if not tokenizers then return nil end
+  if not M.available() then return nil end
   if not prompt or prompt == "" then return nil end
   if type(prompt) ~= "string" then error("Prompt is not type string", 2) end
 
@@ -45,7 +63,7 @@ end
 
 ---@param prompt string
 M.count = function(prompt)
-  if not tokenizers then return math.ceil(#prompt * 0.5) end
+  if not M.available() then return math.ceil(#prompt * 0.5) end
 
   local tokens = M.encode(prompt)
   if not tokens then return 0 end