fix(lsp): only advertise debugSingle capability if nvim-dap is found

CHANGELOG.md

@@ -6,8 +6,17 @@ 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).
 
+## [Unreleased]
+
+### Fixed
+
+- LSP: Only advertise `rust-analyzer.debugSingle` command capability
+  if nvim-dap is installed.
+
 ## [4.2.0] - 2024-01-30
 
+### Added
+
 - Config: Separate `tools.executor` and `tools.test_executor` options.
   The `test_executor` is used for test runnables (e.g. `cargo test`).
 - LSP: New test executor, `'background'` that runs tests in the background

lua/rustaceanvim/lsp.lua

@@ -194,14 +194,18 @@ M.start = function(bufnr)
   }
 
   -- rust analyzer goodies
+  local experimental_commands = {
+    'rust-analyzer.runSingle',
+    'rust-analyzer.showReferences',
+    'rust-analyzer.gotoLocation',
+    'editor.action.triggerParameterHints',
+  }
+  if package.loaded['dap'] ~= nil then
+    table.insert(experimental_commands, 'rust-analyzer.debugSingle')
+  end
+
   capabilities.experimental.commands = {
-    commands = {
-      'rust-analyzer.runSingle',
-      'rust-analyzer.debugSingle',
-      'rust-analyzer.showReferences',
-      'rust-analyzer.gotoLocation',
-      'editor.action.triggerParameterHints',
-    },
+    commands = experimental_commands,
   }
 
   lsp_start_config.capabilities = vim.tbl_deep_extend('force', capabilities, lsp_start_config.capabilities or {})