Add quotes around paths passed to graphviz (#73)

Author: chtenb

Rubjerg.Graphviz.Test/Reproductions.cs

@@ -1,4 +1,5 @@
 using NUnit.Framework;
+using System;
 using System.Globalization;
 using System.IO;
 using System.Linq;
@@ -20,6 +21,15 @@ public void SetUp()
         _testDir = TestContext.CurrentContext.TestDirectory;
     }
 
+    [Test()]
+    public void ExportPathWithSpaces()
+    {
+        RootGraph root = RootGraph.CreateNew(GraphType.Directed, "");
+        _ = root.GetOrAddNode("A");
+        root.ToDotFile(TestContext.CurrentContext.TestDirectory + "/name with spaces.dot");
+        root.ToSvgFile(TestContext.CurrentContext.TestDirectory + "/name with spaces.svg");
+    }
+
     [Test()]
     [TestCase("Times-Roman", 7, 0.01)]
     [TestCase("Times-Roman", 7, 0.5)]

Rubjerg.Graphviz/GraphvizCommand.cs

@@ -42,7 +42,7 @@ public static (byte[] stdout, string stderr) Exec(Graph input, string format = "
         string arguments = $"-T{format} -K{engine}";
         if (outputPath != null)
         {
-            arguments = $"{arguments} -o{outputPath}";
+            arguments = $"{arguments} -o\"{outputPath}\"";
         }
         string inputToStdin = input.ToDotString();