From 3bb667bc88285e531b845b3112c9c2e9dfbbf22d Mon Sep 17 00:00:00 2001
From: Stephen Waits <steve@waits.net>
Date: Sat, 11 Apr 2026 19:20:08 -0600
Subject: [PATCH] feat: rust adapter auto-builds via cargo and finds binary

---
 lua/tiny-debugger/adapters/c.lua | 53 ++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/lua/tiny-debugger/adapters/c.lua b/lua/tiny-debugger/adapters/c.lua
index 91127cb..a6b2f58 100644
--- a/lua/tiny-debugger/adapters/c.lua
+++ b/lua/tiny-debugger/adapters/c.lua
@@ -2,6 +2,37 @@ local loader = require("tiny-debugger.adapters.init")
 
 local M = {}
 
+local function find_rust_binary()
+  -- build and capture artifact paths
+  vim.notify("cargo build ...", vim.log.levels.INFO)
+  local output = vim.fn.system("cargo build --message-format=json 2>/dev/null")
+  if vim.v.shell_error ~= 0 then
+    vim.notify("cargo build failed", vim.log.levels.ERROR)
+    return nil
+  end
+
+  local executables = {}
+  for line in output:gmatch("[^\n]+") do
+    local ok, msg = pcall(vim.json.decode, line)
+    if ok and msg.reason == "compiler-artifact" and msg.executable then
+      table.insert(executables, msg.executable)
+    end
+  end
+
+  if #executables == 1 then
+    return executables[1]
+  elseif #executables > 1 then
+    local choice = vim.fn.inputlist(
+      vim.list_extend({ "Select executable:" },
+        vim.tbl_map(function(e) return "  " .. vim.fn.fnamemodify(e, ":t") end, executables))
+    )
+    return choice > 0 and executables[choice] or nil
+  end
+
+  -- fallback: prompt
+  return vim.fn.input("Path to executable: ", vim.fn.getcwd() .. "/target/debug/", "file")
+end
+
 function M.register(dap)
   local codelldb = loader.find_executable({ "codelldb" })
   if not codelldb then return end
@@ -15,7 +46,13 @@ function M.register(dap)
     },
   }
 
-  local configurations = {
+  -- register adapter once
+  if not dap.adapters.codelldb then
+    dap.adapters.codelldb = adapter
+  end
+
+  -- C/C++/Swift: prompt for executable path
+  local prompt_config = {
     {
       type = "codelldb",
       request = "launch",
@@ -26,8 +63,20 @@ function M.register(dap)
       cwd = "${workspaceFolder}",
     },
   }
+  for _, ft in ipairs({ "c", "cpp", "swift" }) do
+    dap.configurations[ft] = dap.configurations[ft] or prompt_config
+  end
 
-  loader.register(dap, "codelldb", adapter, configurations, { "c", "cpp", "rust", "swift" })
+  -- Rust: cargo build + auto-find binary
+  dap.configurations.rust = dap.configurations.rust or {
+    {
+      type = "codelldb",
+      request = "launch",
+      name = "Cargo build & launch",
+      program = find_rust_binary,
+      cwd = "${workspaceFolder}",
+    },
+  }
 end
 
 return M