fix(lsp): support top level object + rust-analyzer key in rust-analyzer.json (#243)

Author: mrcjkb

CHANGELOG.md

@@ -6,6 +6,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [4.7.4] - 2024-02-19
+
+### Fixed
+
+- LSP: Support both top-level rust-analyzer object and object with
+  `"rust-analyzer":` key when importing settings from `rust-analyzer.json`.
+  The fix introduced in version 4.6.0 had accidentally broken
+  backward compatibility. The new implementation is backward compatible again.
+
 ## [4.7.3] - 2024-02-15
 
 ### Fixed

lua/rustaceanvim/config/server.lua

@@ -51,12 +51,19 @@ function server.load_rust_analyzer_settings(project_root, opts)
   local config_json = results[1]
   local content = read_file(config_json)
   local success, rust_analyzer_settings = pcall(vim.json.decode, content)
-  if not success then
+  if not success or not rust_analyzer_settings then
     local msg = 'Could not decode ' .. config_json .. '. Falling back to default settings.'
     vim.notify('rustaceanvim: ' .. msg, vim.log.levels.ERROR)
     return default_settings
   end
-  default_settings['rust-analyzer'] = rust_analyzer_settings
+  local ra_key = 'rust-analyzer'
+  if rust_analyzer_settings[ra_key] then
+    -- Settings json with "rust-analyzer" key
+    default_settings[ra_key] = rust_analyzer_settings[ra_key]
+  else
+    -- "rust-analyzer" settings are top level
+    default_settings[ra_key] = rust_analyzer_settings
+  end
   return default_settings
 end