log missing SettingPreset files

Sources/XcodeGenKit/SettingsBuilder.swift

@@ -63,9 +63,23 @@ extension SettingsPresetFile {
         if let group = buildSettingFiles[path] {
             return group
         }
-        let settingsPath = Path(#file).parent().parent().parent() + "SettingPresets/\(path).yml"
-        guard settingsPath.exists,
-            let buildSettings = try? BuildSettings(path: settingsPath) else { return nil }
+        let relativePath = "SettingPresets/\(path).yml"
+        let settingsPath = Path(#file).parent().parent().parent() + relativePath
+
+        guard settingsPath.exists else {
+            switch self {
+            case .base, .config, .platform:
+                print("No \"\(name)\" settings found at \(settingsPath)")
+            case .product:
+                break
+            }
+            return nil
+        }
+
+        guard let buildSettings = try? BuildSettings(path: settingsPath) else {
+            print("Error parsing \"\(name)\" settings")
+            return nil
+        }
         buildSettingFiles[path] = buildSettings
         return buildSettings
     }

Sources/XcodeGenKit/SettingsPresetFile.swift

@@ -24,4 +24,13 @@ public enum SettingsPresetFile {
         case .base: return "base"
         }
     }
+
+    var name: String {
+        switch self {
+        case let .config(config): return "\(config.rawValue) config"
+        case let .platform(platform): return platform.rawValue
+        case let .product(product): return product.name
+        case .base: return "base"
+        }
+    }
 }