format

[kdurant]

I install cmake-format and config cmake-language-server

  "languageserver": {
    "cmake": {
      "command": "cmake-language-server",
      "filetypes": ["cmake"],
      "rootPatterns": [
        "build/"
      ],
      "initializationOptions": {
        "buildDirectory": "build"
      }
    }
  }

It can't format CMakeLists.txt when I saved it.

[jasongshap]

Saw this too and when I ran formatting_sync directly I got the following:
vim.lsp.buf.formatting_sync: timeout

Try running with a longer timeout:
:lua vim.lsp.buf.formatting_sync(nil, 5000)