Don't use compdb on Windows since its borked

plugin/build.lua

@@ -21,45 +21,58 @@ function build.set_dir(dirname)
   end
 
   build.dir = build_dir
-
-  echo('Processing compile_commands.json with compdb ...', 'DiagnosticInfo')
   local compile_commands = current_dir .. '/compile_commands.json'
-  -- Post-process compile_commands.json with compdb as an async job to avoid
-  -- blocking the user interface
-  vim.fn.jobstart(
-    'compdb -p ' .. build.dir .. ' list > ' .. compile_commands, {
 
-      -- Restart clangd language server
-      on_exit = function()
+  if vim.fn.executable('compdb') == 1 then
+    echo('Processing compile_commands.json with compdb ...', 'DiagnosticInfo')
+    -- Post-process compile_commands.json with compdb as an async job to avoid
+    -- blocking the user interface
+    vim.fn.jobstart(
+      'compdb -p ' .. build.dir .. ' list > ' .. compile_commands, {
+
+        -- Restart clangd language server
+        on_exit = function()
+          -- This is a callback so doesn't run on the main thread which causes
+          -- issues for running commands, so schedule that on the main thread.
+          vim.schedule(function()
+            vim.cmd('LspRestart')
+            echo('Build directory selected: ' .. dirname, 'DiagnosticInfo')
+          end)
+        end,
+
+        -- Display any error messages to the user
+        on_stderr = function(_, output, _)
+          -- Remove any lines containing a compdb warning
+          local error = {}
+          local warning = 'WARNING:compdb'
+          for _, line in ipairs(output) do
+            if string.sub(line, 1, #warning) ~= warning then
+              table.insert(error, line)
+            end
+          end
+
+          -- Display the error message if there was one
+          if table.maxn(error) > 0 then
+            echo(vim.fn.join(error, '\n'), 'Error')
+            return
+          end
+        end,
+
+        stderr_buffered = true,
+      }
+    )
+  else
+    vim.uv.fs_copyfile(build_dir .. '/compile_commands.json', compile_commands, nil,
+      function()
         -- This is a callback so doesn't run on the main thread which causes
         -- issues for running commands, so schedule that on the main thread.
         vim.schedule(function()
           vim.cmd('LspRestart')
           echo('Build directory selected: ' .. dirname, 'DiagnosticInfo')
         end)
-      end,
-
-      -- Display any error messages to the user
-      on_stderr = function(_, output, _)
-        -- Remove any lines containing a compdb warning
-        local error = {}
-        local warning = 'WARNING:compdb'
-        for _, line in ipairs(output) do
-          if string.sub(line, 1, #warning) ~= warning then
-            table.insert(error, line)
-          end
-        end
-
-        -- Display the error message if there was one
-        if table.maxn(error) > 0 then
-          echo(vim.fn.join(error, '\n'), 'Error')
-          return
-        end
-      end,
-
-      stderr_buffered = true,
-    }
-  )
+      end
+    )
+  end
 end
 
 function build.select_dir(callback)