From e73be72fae7858324c479e21b52b6eb7d30cb053 Mon Sep 17 00:00:00 2001
From: Bukkit/Spigot <noreply+git-bukkit@papermc.io>
Date: Sun, 8 Jan 2012 23:29:33 +0000
Subject: [PATCH] Fixed YamlConfiguration creating empty lines when reading a
 file with no contents, and made it trim the initial newlines of any existing
 config header

By: Nathan Adams <dinnerbone@dinnerbone.com>
---
 .../configuration/file/YamlConfiguration.java |  7 +++--
 .../file/FileConfigurationTest.java           | 29 ++++++++++++++++---
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/paper-api/src/main/java/org/bukkit/configuration/file/YamlConfiguration.java b/paper-api/src/main/java/org/bukkit/configuration/file/YamlConfiguration.java
index 237018e3d8..a15f69b735 100644
--- a/paper-api/src/main/java/org/bukkit/configuration/file/YamlConfiguration.java
+++ b/paper-api/src/main/java/org/bukkit/configuration/file/YamlConfiguration.java
@@ -148,6 +148,7 @@ public class YamlConfiguration extends FileConfiguration {
         String[] lines = input.split("\r?\n", -1);
         StringBuilder result = new StringBuilder();
         boolean readingHeader = true;
+        boolean foundHeader = false;
 
         for (int i = 0; (i < lines.length) && (readingHeader); i++) {
             String line = lines[i];
@@ -160,9 +161,11 @@ public class YamlConfiguration extends FileConfiguration {
                 if (line.length() > COMMENT_PREFIX.length()) {
                     result.append(line.substring(COMMENT_PREFIX.length()));
                 }
-            } else if (line.length() == 0) {
+
+                foundHeader = true;
+            } else if ((foundHeader) && (line.length() == 0)) {
                 result.append("\n");
-            } else {
+            } else if (foundHeader) {
                 readingHeader = false;
             }
         }
diff --git a/paper-api/src/test/java/org/bukkit/configuration/file/FileConfigurationTest.java b/paper-api/src/test/java/org/bukkit/configuration/file/FileConfigurationTest.java
index 2b976725a0..627ca24efc 100644
--- a/paper-api/src/test/java/org/bukkit/configuration/file/FileConfigurationTest.java
+++ b/paper-api/src/test/java/org/bukkit/configuration/file/FileConfigurationTest.java
@@ -170,19 +170,40 @@ public abstract class FileConfigurationTest extends MemoryConfigurationTest {
         String saved = getTestValuesString();
         String header = getTestHeaderResult();
         String expected = getTestHeaderInput();
-        
+
         defaults.loadFromString(header);
         config.loadFromString(saved);
         config.setDefaults(defaults);
-        
+
         assertNull(config.options().header());
         assertEquals(expected, defaults.options().header());
-        
+
         for (Map.Entry<String, Object> entry : values.entrySet()) {
             assertEquals(entry.getValue(), config.get(entry.getKey()));
         }
-        
+
         assertEquals(values.keySet(), config.getKeys(true));
         assertEquals(header + "\n" + saved, config.saveToString());
+
+        config = getConfig();
+        config.loadFromString(getTestHeaderResult() + saved);
+        assertEquals(getTestHeaderResult() + saved, config.saveToString());
+    }
+
+    @Test
+    public void testReloadEmptyConfig() throws Exception {
+        FileConfiguration config = getConfig();
+
+        assertEquals("", config.saveToString());
+
+        config = getConfig();
+        config.loadFromString("");
+
+        assertEquals("", config.saveToString());
+
+        config = getConfig();
+        config.loadFromString("\n\n"); // Should trim the first newlines of a header
+
+        assertEquals("", config.saveToString());
     }
 }