chore(build): support build lua-tiktoken on Windows (#128)

Signed-off-by: Hanchin Hsieh <me@yuchanns.xyz>

Build-LuaTiktoken.ps1

@@ -0,0 +1,32 @@
+param (
+    [string]$Version = "luajit"
+)
+
+$BuildDir = "build"
+$BuildFromSource = $true
+
+function Build-FromSource($feature) {
+    if (-not (Test-Path $BuildDir)) {
+        New-Item -ItemType Directory -Path $BuildDir | Out-Null
+    }
+
+    $tempDir = Join-Path $BuildDir "lua-tiktoken-temp"
+    git clone https://github.com/gptlang/lua-tiktoken.git $tempDir
+
+    Push-Location $tempDir
+    cargo build --features=$feature
+    Pop-Location
+
+    $targetFile = "tiktoken_core.dll"
+    Copy-Item (Join-Path $tempDir "target\debug\tiktoken_core.dll") (Join-Path $BuildDir $targetFile)
+
+    Remove-Item -Recurse -Force $tempDir
+}
+
+function Main {
+    Write-Host "Building for $Version..."
+    Build-FromSource $Version
+}
+
+# Run the main function
+Main

README.md

@@ -51,6 +51,17 @@ Install `avante.nvim` using [lazy.nvim](https://github.com/folke/lazy.nvim):
 }
 ```
 
+For Windows users, change the build command to the following:
+
+```lua
+{
+  "yetone/avante.nvim",
+  event = "VeryLazy",
+  build = "powershell -ExecutionPolicy Bypass -File Build-LuaTiktoken.ps1",
+  -- rest of the config
+}
+```
+
 > [!IMPORTANT]
 >
 > `avante.nvim` is currently only compatible with Neovim 0.10.0 or later. Please ensure that your Neovim version meets these requirements before proceeding.

lua/tiktoken_lib.lua

@@ -7,6 +7,8 @@ H.get_os_name = function()
     return "linux"
   elseif os_name == "Darwin" then
     return "macOS"
+  elseif os_name == "Windows_NT" then
+    return "windows"
   else
     error("Unsupported operating system: " .. os_name)
   end
@@ -14,7 +16,7 @@ end
 
 H.library_path = function()
   local os_name = H.get_os_name()
-  local ext = os_name == "linux" and "so" or "dylib"
+  local ext = os_name == "linux" and "so" or (os_name == "macOS" and "dylib" or "dll")
   local dirname = string.sub(debug.getinfo(1).source, 2, #"/tiktoken_lib.lua" * -1)
   return dirname .. ("../build/?.%s"):format(ext)
 end