fix(dap): prevent parallel cargo test builds (#501)

CHANGELOG.md

@@ -6,6 +6,14 @@ 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).
 
+## [5.4.2] - 2024-09-12
+
+### Fixed
+
+- When adding DAP configurations
+  (`vim.g.rustaceanvim.dap.autoload_configurations = true`, default),
+  wait for compilation before spawning another process for the next compilation.
+
 ## [5.4.1] - 2024-09-10
 
 ### Fixed

lua/rustaceanvim/commands/debuggables.lua

@@ -120,16 +120,28 @@ local function add_debuggables_to_nvim_dap(debuggables)
   end
   local rt_dap = require('rustaceanvim.dap')
   dap.configurations.rust = dap.configurations.rust or {}
-  for _, debuggable in pairs(debuggables) do
+  -- To prevent parallel 'cargo build" processes, we
+  -- iterate over the debuggables using a recursive function.
+  -- We can't use vim.system():wait(), because it blocks the UI.
+  local iter = vim.iter(debuggables)
+  ---@type function
+  local go
+  go = function()
+    local debuggable = iter:next()
+    if not debuggable then
+      return
+    end
     rt_dap.start(debuggable.args, false, function(configuration)
       local name = 'Cargo: ' .. build_label(debuggable.args)
       if not _dap_configuration_added[name] then
         configuration.name = name
         table.insert(dap.configurations.rust, configuration)
         _dap_configuration_added[name] = true
       end
+      go()
     end)
   end
+  pcall(go) -- Ignore stack overflow errors
 end
 
 ---@param debuggables rustaceanvim.RARunnable[]