feat(rust_analyzer): port config for neovim 0.11

Author: TheRealLorenz

lsp/rust_analyzer.lua

@@ -0,0 +1,126 @@
+local util = require 'lspconfig.util'
+local async = require 'lspconfig.async'
+
+local function reload_workspace(bufnr)
+  bufnr = util.validate_bufnr(bufnr)
+  local clients = util.get_lsp_clients { bufnr = bufnr, name = 'rust_analyzer' }
+  for _, client in ipairs(clients) do
+    vim.notify 'Reloading Cargo Workspace'
+    client.request('rust-analyzer/reloadWorkspace', nil, function(err)
+      if err then
+        error(tostring(err))
+      end
+      vim.notify 'Cargo workspace reloaded'
+    end, 0)
+  end
+end
+
+local function is_library(fname)
+  local user_home = vim.fs.normalize(vim.env.HOME)
+  local cargo_home = os.getenv 'CARGO_HOME' or user_home .. '/.cargo'
+  local registry = cargo_home .. '/registry/src'
+  local git_registry = cargo_home .. '/git/checkouts'
+
+  local rustup_home = os.getenv 'RUSTUP_HOME' or user_home .. '/.rustup'
+  local toolchains = rustup_home .. '/toolchains'
+
+  for _, item in ipairs { toolchains, registry, git_registry } do
+    if util.path.is_descendant(item, fname) then
+      local clients = util.get_lsp_clients { name = 'rust_analyzer' }
+      return #clients > 0 and clients[#clients].config.root_dir or nil
+    end
+  end
+end
+
+local commands = {
+  CargoReload = {
+    function()
+      reload_workspace(0)
+    end,
+    description = 'Reload current cargo workspace',
+  },
+}
+
+---https://github.com/rust-lang/rust-analyzer
+--
+-- rust-analyzer (aka rls 2.0), a language server for Rust
+--
+--
+-- See [docs](https://rust-analyzer.github.io/book/configuration.html) for extra settings. The settings can be used like this:
+-- ```lua
+-- require'lspconfig'.rust_analyzer.setup{
+--   settings = {
+--     ['rust-analyzer'] = {
+--       diagnostics = {
+--         enable = false;
+--       }
+--     }
+--   }
+-- }
+-- ```
+--
+-- Note: do not set `init_options` for this LS config, it will be automatically populated by the contents of settings["rust-analyzer"] per
+-- https://github.com/rust-lang/rust-analyzer/blob/eb5da56d839ae0a9e9f50774fa3eb78eb0964550/docs/dev/lsp-extensions.md?plain=1#L26.
+return {
+  cmd = { 'rust-analyzer' },
+  filetypes = { 'rust' },
+  root_dir = function(bufnr, done_callback)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    local reuse_active = is_library(fname)
+    if reuse_active then
+      return reuse_active
+    end
+
+    local cargo_crate_dir = util.root_pattern 'Cargo.toml'(fname)
+
+    if cargo_crate_dir == nil then
+      done_callback(
+        util.root_pattern 'rust-project.json'(fname)
+          or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true })[1])
+      )
+      return
+    end
+
+    local cmd = {
+      'cargo',
+      'metadata',
+      '--no-deps',
+      '--format-version',
+      '1',
+      '--manifest-path',
+      cargo_crate_dir .. '/Cargo.toml',
+    }
+
+    async.run_job(cmd, function(output)
+      local cargo_workspace_root
+
+      if output and output[1] then
+        output = vim.json.decode(table.concat(output, ''))
+        if output['workspace_root'] then
+          cargo_workspace_root = vim.fs.normalize(output['workspace_root'])
+        end
+      end
+
+      done_callback(
+        cargo_workspace_root
+          or cargo_crate_dir
+          or util.root_pattern 'rust-project.json'(fname)
+          or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true })[1])
+      )
+    end)
+  end,
+  capabilities = {
+    experimental = {
+      serverStatusNotification = true,
+    },
+  },
+  before_init = function(init_params, config)
+    -- See https://github.com/rust-lang/rust-analyzer/blob/eb5da56d839ae0a9e9f50774fa3eb78eb0964550/docs/dev/lsp-extensions.md?plain=1#L26
+    if config.settings and config.settings['rust-analyzer'] then
+      init_params.initializationOptions = config.settings['rust-analyzer']
+    end
+  end,
+  on_attach = function()
+    util.register_commands(commands)
+  end,
+}