Create parent directory before saving solution file (#45)

Fixes #44

src/SlnGen.Build.Tasks.UnitTests/SlnFileTests.cs

@@ -7,6 +7,7 @@
 using SlnGen.Build.Tasks.Internal;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using Xunit;
 using MSBuildSolutionFile = Microsoft.Build.Construction.SolutionFile;
@@ -69,6 +70,22 @@ public void NoFolders()
             ValidateProjectInSolution((s, p) => p.ParentProjectGuid.ShouldBe(null), projects, false);
         }
 
+        [Fact]
+        public void SaveToCustomLocationCreatesDirectory()
+        {
+            DirectoryInfo directoryInfo = new DirectoryInfo(Path.Combine(TestRootPath, "1", "2", "3"));
+
+            directoryInfo.Exists.ShouldBeFalse();
+
+            string fullPath = Path.Combine(directoryInfo.FullName, Path.GetRandomFileName());
+
+            SlnFile slnFile = new SlnFile();
+
+            slnFile.Save(fullPath, folders: false);
+
+            File.Exists(fullPath).ShouldBeTrue();
+        }
+
         private void ValidateProjectInSolution(Action<SlnProject, ProjectInSolution> customValidator, SlnProject[] projects, bool folders)
         {
             string solutionFilePath = GetTempFileName();

src/SlnGen.Build.Tasks/Internal/SlnFile.cs

@@ -80,6 +80,13 @@ public void AddSolutionItems(IEnumerable<string> items)
         /// <param name="folders">Specifies if folders should be created.</param>
         public void Save(string path, bool folders)
         {
+            string directoryName = Path.GetDirectoryName(path);
+
+            if (!String.IsNullOrWhiteSpace(directoryName))
+            {
+                Directory.CreateDirectory(directoryName);
+            }
+
             using (StreamWriter writer = File.CreateText(path))
             {
                 Save(writer, folders);