介绍
The vim.loader module is a relatively new addition to Neovim (introduced in version 0.9) designed to speed up the startup process of Neovim by optimizing how Lua modules are loaded. It provides a mechanism for lazy-loading Lua files and caching their bytecode, which results in faster execution of scripts, especially during startup.
点评：
vim.loader 是 Neovim 0.9 才添加的新特性，主要目的就是提高启动速度。它可以把已经解析过的 lua module 以 bytecode 的形式保存到 cache 里面，这样，再次访问的时候就无需再去解析源码了，能显著的提升性能。
What is vim.loader?
• vim.loader helps Neovim preload and cache Lua modules used in your configuration.
• This bytecode caching means that Lua scripts don’t need to be parsed every time Neovim starts, which can significantly reduce startup times.
• It’s particularly useful for users with complex configurations or plugins that load numerous Lua files.
The two main methods provided by vim.loader are:
1. vim.loader.enable(): This method enables caching for Lua files. Once enabled, Neovim will cache bytecode for the loaded modules, allowing subsequent startups to be faster.
2. vim.loader.reset(): This method clears the bytecode cache. It can be useful if you need to reset the cached state, for example, after editing your configuration files.
Example: Using vim.loader in Your Config
1. Enable Loader Caching
You need to enable caching in your init.lua file or early in your configuration:
vim.loader.enable()
This line will instruct Neovim to cache Lua bytecode, thereby speeding up future startups.
2. Practical Usage
Let’s say you have several Lua modules in your configuration. Here’s how the caching works:
• On the first startup, after adding vim.loader.enable(), Neovim will cache the Lua files as they are loaded.
• On subsequent starts, the cached bytecode is used, avoiding the overhead of parsing the Lua scripts again.
Example: Using with Modules
Suppose you have a few custom Lua modules for different parts of your configuration:
-- init.lua
vim.loader.enable()
-- Load other configurations
require('keymaps') -- keymaps.lua
require('options') -- options.lua
require('plugins') -- plugins.lua
By enabling the loader at the top of your init.lua, you ensure that each time require() is called, the bytecode is cached, and subsequent runs use the cached version for improved speed.
When to Use vim.loader.reset()
• If you make changes to any of your Lua files and want to clear the cache so Neovim loads the updated version, you can use:
vim.loader.reset()
This is especially useful during development when you’re frequently modifying your config files. Alternatively, you can just restart Neovim, and it will naturally update the cached files.
Why vim.loader is Important
• Startup Optimization: One of the biggest advantages of vim.loader is the reduction in startup time for Neovim, especially beneficial if your configuration loads many Lua files.
• Bytecode Caching: Instead of loading and interpreting Lua code every time, Neovim stores bytecode that’s faster to execute. This results in a smoother experience and quicker access to the editor.
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