works

Configuration.cs

@@ -0,0 +1,10 @@
+namespace podcast_agent
+{
+    using System.Xml.Linq;
+    public class Configuration
+    {
+        public string OutputDir { get; set; } = "../";
+        public string UserAgent { get; set; } = "secret-chinese-spy-drone/0.1";
+        public List<string> PodcastUrls { get; set; }
+    }
+}

Program.cs

@@ -1,17 +1,23 @@
 namespace podcast_agent
 {
     using System.Xml.Linq;
+    using Newtonsoft.Json;
 
     class Program
     {
         static async Task Main(string[] args)
         {
+            var conf = Configure();
             var downloader = new HttpClient();
-            downloader.DefaultRequestHeaders.UserAgent.ParseAdd("wget-is-not-a-crime");
+            downloader.DefaultRequestHeaders.UserAgent.ParseAdd(conf.UserAgent);
-
-            var xml = XDocument.Load("https://feeds.npr.org/500005/podcast.xml");
 
             XNamespace ns = "http://www.itunes.com/dtds/podcast-1.0.dtd";
+            foreach (var feed in conf.PodcastUrls)
+            {
+                try
+                {
+                    var xml = XDocument.Load(feed);
+
                     foreach (var item in xml.Descendants("item"))
                     {
                         var title = item.Element("title")?.Value;
@@ -24,11 +30,44 @@
                         }
 
                         Console.WriteLine($"{title}, {attachmentLink}");
-                var downloadPath = title + ext;
+                        var downloadPath = Path.Combine(conf.OutputDir, title + ext);
                         var dlResult = (await downloader.GetAsync(attachmentLink));
                         File.WriteAllBytes(downloadPath, await dlResult.Content.ReadAsByteArrayAsync());
                     }
+                }
+                catch (Exception e)
+                {
+                    Console.Error.WriteLine($"failed attempting to dl {feed} -");
+                    Console.Error.WriteLine(e);
+                }
+            }
+        }
+        static Configuration Configure(string configurationPath = "appsettings.json")
+        {
+            if (!File.Exists(configurationPath))
+            {
+                Console.Error.WriteLine($"could not find configuration at {configurationPath}! copying sample to that spot.");
+                File.Copy("sample-appsettings.json", configurationPath); //and you know what, if that explodes at the OS level, the OS should give you an error
+                return null;
+            }
+            var fileContents = File.ReadAllText(configurationPath);
+            if (string.IsNullOrWhiteSpace(fileContents))
+            {
+                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
+                File.Copy("sample-appsettings.json", configurationPath, true);
+                return null;
+            }
 
+            var conf = JsonConvert.DeserializeObject<Configuration>(fileContents);
+
+            if (conf == null)
+            {
+                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
+                File.Copy("sample-appsettings.json", configurationPath, true);
+                return null;
+            }
+
+            return conf;
         }
     }
 }