local configs = require "lspconfig/configs"
local util = require "lspconfig/util"
local lsp = vim.lsp

local function reload_workspace(bufnr)
  bufnr = util.validate_bufnr(bufnr)
  lsp.buf_request(bufnr, "rust-analyzer/reloadWorkspace", nil, function(err, _, result, _)
    if err then
      error(tostring(err))
    end
    vim.notify "Cargo workspace reloaded"
  end)
end

configs.rust_analyzer = {
  default_config = {
    cmd = { "rust-analyzer" },
    filetypes = { "rust" },
    root_dir = function(fname)
      local cargo_crate_dir = util.root_pattern "Cargo.toml"(fname)
      local cmd = "cargo metadata --no-deps --format-version 1"
      if cargo_crate_dir ~= nil then
        cmd = cmd .. " --manifest-path " .. util.path.join(cargo_crate_dir, "Cargo.toml")
      end
      local cargo_metadata = vim.fn.system(cmd)
      local cargo_workspace_dir = nil
      if vim.v.shell_error == 0 then
        cargo_workspace_dir = vim.fn.json_decode(cargo_metadata)["workspace_root"]
      end
      return cargo_workspace_dir
        or cargo_crate_dir
        or util.root_pattern "rust-project.json"(fname)
        or util.find_git_ancestor(fname)
    end,
    settings = {
      ["rust-analyzer"] = {},
    },
  },
  commands = {
    CargoReload = {
      function()
        reload_workspace(0)
      end,
      description = "Reload current cargo workspace",
    },
  },
  docs = {
    package_json = "https://raw.githubusercontent.com/rust-analyzer/rust-analyzer/master/editors/code/package.json",
    description = [[
https://github.com/rust-analyzer/rust-analyzer

rust-analyzer (aka rls 2.0), a language server for Rust

See [docs](https://github.com/rust-analyzer/rust-analyzer/tree/master/docs/user#settings) for extra settings.
    ]],
    default_config = {
      root_dir = [[root_pattern("Cargo.toml", "rust-project.json")]],
    },
  },
}

configs.rust_analyzer.reload_workspace = reload_workspace
-- vim:et ts=2 sw=2