Swift: add diagnostic for no project found

Author: redsun82

swift/integration-tests/osx-only/autobuilder/no-build-system/diagnostics.expected

@@ -0,0 +1,17 @@
+{
+  "helpLinks": [
+    "https://docs.github.com/en/enterprise-server/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning"
+  ],
+  "plaintextMessage": "No Xcode project or workspace was found.\n\nSet up a manual build command.",
+  "severity": "error",
+  "source": {
+    "extractorName": "swift",
+    "id": "swift/autobuilder/no-project-found",
+    "name": "No Xcode project or workspace detected"
+  },
+  "visibility": {
+    "cliSummaryTable": true,
+    "statusPage": true,
+    "telemetry": true
+  }
+}

swift/integration-tests/osx-only/autobuilder/no-build-system/test.py

@@ -0,0 +1,5 @@
+from create_database_utils import *
+from diagnostics_test_utils import *
+
+run_codeql_database_create([], lang='swift', keep_trap=True, db=None, runFunction=runUnsuccessfully)
+check_diagnostics()

swift/integration-tests/osx-only/autobuilder/no-build-system/x.swift

@@ -1,6 +1,4 @@
 #include "swift/xcode-autobuilder/XcodeProjectParser.h"
-#include "swift/xcode-autobuilder/XcodeWorkspaceParser.h"
-#include "swift/xcode-autobuilder/CFHelpers.h"
 
 #include <iostream>
 #include <filesystem>
@@ -9,8 +7,27 @@
 #include <fstream>
 #include <CoreFoundation/CoreFoundation.h>
 
+#include "swift/xcode-autobuilder/XcodeWorkspaceParser.h"
+#include "swift/xcode-autobuilder/CFHelpers.h"
+#include "swift/logging/SwiftLogging.h"
+
+namespace codeql_diagnostics {
+constexpr codeql::SwiftDiagnosticsSource no_project_found{
+    "no_project_found",
+    "No Xcode project or workspace detected",
+    "Set up a manual build command",
+    "https://docs.github.com/en/enterprise-server/code-security/code-scanning/"
+    "automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning",
+};
+}  // namespace codeql_diagnostics
+
 namespace fs = std::filesystem;
 
+static codeql::Logger& logger() {
+  static codeql::Logger ret{"project"};
+  return ret;
+}
+
 struct TargetData {
   std::string workspace;
   std::string project;
@@ -253,7 +270,7 @@ std::vector<Target> collectTargets(const std::string& workingDir) {
   // Getting a list of workspaces and the project that belong to them
   auto workspaces = collectWorkspaces(workingDir);
   if (workspaces.empty()) {
-    std::cerr << "[xcode autobuilder] Xcode project or workspace not found\n";
+    DIAGNOSE_ERROR(no_project_found, "No Xcode project or workspace was found");
     exit(1);
   }