Fix comment writing (#22)

Signed-off-by: liach <liach@users.noreply.github.com>

gradle.properties

@@ -1,4 +1,4 @@
 name = stitch
 description = Fabric auxillary Tiny tools
 url = https://github.com/FabricMC/stitch
-version = 0.4.0
+version = 0.4.1

src/main/java/net/fabricmc/stitch/commands/tinyv2/TinyMethod.java

@@ -23,6 +23,13 @@
 
 public class TinyMethod implements Comparable<TinyMethod>, Mapping {
 
+	@Override
+	public String toString() {
+		return "TinyMethod(names = [" + String.join(", ", methodNames) + "], desc = " + methodDescriptorInFirstNamespace
+				+ ", " + parameters.size() + " params, "
+				+ localVariables.size() + " vars, " + comments.size() + " comments)";
+	}
+
 	/**
 	 * For example when we have official -> named mappings the descriptor will be in official, but in named -> official
 	 * the descriptor will be in named.

src/main/java/net/fabricmc/stitch/commands/tinyv2/TinyV2Writer.java

@@ -129,9 +129,26 @@ private void writeField(TinyField field) {
 
 
 	private void writeComment(int indentLevel, String comment) {
-		writeLine(indentLevel, Prefixes.COMMENT, comment);
+		writeLine(indentLevel, Prefixes.COMMENT, escapeComment(comment));
+	}
+
+	private static String escapeComment(String old) {
+		StringBuilder sb = new StringBuilder(old.length());
+		for (int i = 0; i < old.length(); i++) {
+			char c = old.charAt(i);
+			int t = TO_ESCAPE.indexOf(c);
+			if (t == -1) {
+				sb.append(c);
+			} else {
+				sb.append('\\').append(ESCAPED.charAt(t));
+			}
+		}
+		return sb.toString();
 	}
 
+	private static final String TO_ESCAPE = "\\\n\r\0\t";
+	private static final String ESCAPED = "\\nr0t";
+
 
 	private void write(int indentLevel, String... tabSeparatedStrings) {
 		try {