coc-settings.json

{
  "languageserver": {
    "ccls": {
      "command": "ccls",
      "filetypes": [
        "c",
        "cpp",
        "cuda",
        "objc",
        "objcpp"
      ],
      "initializationOptions": {
        "cache": {
          "directory": ".ccls-cache"
        },
        "client": {
          "snippetSupport": true
        }
      },
      "rootPatterns": [
        ".ccls-root",
        "compile_commands.json"
      ]
    },
    "lua": {
      "command": "lua-lsp",
      "filetypes": [
        "lua"
      ]
    },
    "nim": {
      "command": "nimlsp",
      "filetypes": [
        "nim"
      ]
    },
    "vimls": {
      "args": [
        "--stdio"
      ],
      "command": "vim-language-server",
      "filetypes": [
        "vim"
      ],
      "initializationOptions": {
        "diagnostic": {
          "enable": true
        },
        "iskeyword": "vim iskeyword option",
        "runtimepath": "vim/runtime/path",
        "vimruntime": "path/to/$VIMRUNTIME"
      }
    }
  }
}