Allow multiple paths passed through args

EtchBendLines/BendLineExtractor.cs

@@ -6,7 +6,7 @@ using System.Text.RegularExpressions;
 
 namespace EtchBendLines
 {
-    class BendLineExtractor
+    public class BendLineExtractor
     {
         public BendLineExtractor(string dxfFile)
         {

EtchBendLines/Program.cs

@@ -3,38 +3,77 @@ using System.Collections.Generic;
 using System.Configuration;
 using System.IO;
 using System.Linq;
-using System.Text.RegularExpressions;
 
 namespace EtchBendLines
 {
     public class Program
     {
-        static Etcher etcher = new Etcher();
-
         static void Main(string[] args)
         {
-            var path = AppDomain.CurrentDomain.BaseDirectory;
-            var files = Directory.GetFiles(path, "*.dxf", SearchOption.AllDirectories);
-
-            etcher.EtchLength = double.Parse(ConfigurationManager.AppSettings["EtchLength"]);
-            etcher.MaxBendRadius = double.Parse(ConfigurationManager.AppSettings["MaxBendRadius"]);
-
-            if (files == null || files.Length == 0)
+            try
             {
-                Console.WriteLine($"No DXF files founds. Place DXF files in \"{AppDomain.CurrentDomain.BaseDirectory}\" and run this program again.");
-                PressAnyKeyToExit();
-                return;
+                var etcher = new Etcher();
+                etcher.EtchLength = GetAppSettingAsDouble("EtchLength");
+                etcher.MaxBendRadius = GetAppSettingAsDouble("MaxBendRadius");
+
+                var paths = new List<string>(args);
+
+                if (paths.Count == 0)
+                {
+                    paths.Add(AppDomain.CurrentDomain.BaseDirectory);
                 }
 
+                var files = new List<string>();
+
+                foreach (var path in paths)
+                {
+                    if (File.Exists(path))
+                    {
+                        files.Add(path);
+                    }
+                    else if (Directory.Exists(path))
+                    {
+                        files.AddRange(Directory.GetFiles(path, "*.dxf", SearchOption.AllDirectories));
+                    }
+                }
+
+                if (files.Count == 0)
+                {
+                    Console.WriteLine($"No DXF files founds. Place DXF files in \"{AppDomain.CurrentDomain.BaseDirectory}\" and run this program again.");
+                }
+                else
+                {
                     foreach (var file in files)
                     {
                         etcher.AddEtchLines(file);
                         Console.WriteLine();
                     }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.ForegroundColor = ConsoleColor.Red;
+                Console.WriteLine($"An error occured: {ex.Message}");
+                Console.ResetColor();
+            }
 
             PressAnyKeyToExit();
         }
 
+        static double GetAppSettingAsDouble(string name)
+        {
+            double v;
+
+            try
+            {
+                return double.Parse(ConfigurationManager.AppSettings[name]);
+            }
+            catch
+            {
+               throw new Exception($"Failed to convert the value of AppSetting[\"{name}\"] to double");
+            }
+        }
+
         static void PressAnyKeyToExit()
         {
             Console.WriteLine("Press any key to exit.");