Always end written files with a newline

Closes #33

JECS/Parsing Logic/DataConverter.cs

@@ -14,11 +14,19 @@ internal static string GetLineTextIncludingChildLines(Line line)
         /// <summary>
         /// Turns a data structure into raw JECS.
         /// </summary>
-        internal static string JecsFromDataStructure(IEnumerable<Line> lines)
+        internal static string JecsFromDataStructure(IReadOnlyList<Line> lines)
         {
             var jecsBuilder = new StringBuilder();
             RecursivelyBuildLines(lines, jecsBuilder);
-            return FinishJecsBuilder(jecsBuilder);
+
+            // All written files should end with a newline. This is convention when generating plaintext files for a number of good reasons.
+            // If the last line that already exists is empty, then we already have a newline at the end of the file.
+            // In this case, we need to remove the extra newline that was added in RecursivelyBuildLines.
+            // Without this check, files gain an extra newline every time they're saved, ad infinitum!
+            if (lines[lines.Count - 1].RawText == string.Empty)
+                jecsBuilder.Remove(jecsBuilder.Length - Utilities.NewLine.Length, Utilities.NewLine.Length);
+
+            return jecsBuilder.ToString();
 
 
             void RecursivelyBuildLines(IEnumerable<Line> _lines, StringBuilder builder)
@@ -32,9 +40,6 @@ void RecursivelyBuildLines(IEnumerable<Line> _lines, StringBuilder builder)
                         RecursivelyBuildLines(node.ChildLines, builder);
                 }
             }
-
-            string FinishJecsBuilder(StringBuilder builder)
-                => builder.ToString().TrimEnd('\n', '\r', ' ');
         }
 
         /// <summary>

JECS/Parsing Logic/Nodes/Line.cs

@@ -13,7 +13,7 @@ public Line(string rawText)
             this.RawText = rawText;
         }
 
-        public string RawText { get; set; }
+        public string RawText { get; protected set; }
         public int IndentationLevel
         {
             get => RawText.GetIndentationLevel();