Fix line count when file starts with a new line

2 files changed, 21 insertions, 5 deletions

diff --git a/sonar-batch/src/main/java/org/sonar/batch/scan/filesystem/FileMetadata.java b/sonar-batch/src/main/java/org/sonar/batch/scan/filesystem/FileMetadata.java
index 95c6ed4cc3b..4759db79b68 100644
--- a/sonar-batch/src/main/java/org/sonar/batch/scan/filesystem/FileMetadata.java
+++ b/sonar-batch/src/main/java/org/sonar/batch/scan/filesystem/FileMetadata.java
@@ -23,7 +23,12 @@ import org.apache.commons.codec.binary.Hex;
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.io.IOUtils;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.Reader;
 import java.nio.charset.Charset;
 import java.security.MessageDigest;
 
@@ -50,13 +55,13 @@ class FileMetadata {
   Metadata read(File file, Charset encoding) {
     Reader reader = null;
     int lines = 0;
-    char c = (char)-1;
+    char c = (char) -1;
     try {
       MessageDigest md5Digest = DigestUtils.getMd5Digest();
       md5Digest.reset();
       reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), encoding));
       int i = reader.read();
-      boolean afterCR = true;
+      boolean afterCR = false;
       while (i != -1) {
         c = (char) i;
         if (afterCR) {
@@ -77,7 +82,7 @@ class FileMetadata {
         md5Digest.update(charToBytesUTF(c));
         i = reader.read();
       }
-      if (c != (char)-1) {
+      if (c != (char) -1) {
         lines++;
       }
       String hash = Hex.encodeHexString(md5Digest.digest());
@@ -91,7 +96,7 @@ class FileMetadata {
   }
 
   private byte[] charToBytesUTF(char c) {
-    char[] buffer = new char[]{c};
+    char[] buffer = new char[] {c};
     byte[] b = new byte[buffer.length << 1];
     for (int i = 0; i < buffer.length; i++) {
       int bpos = i << 1;
diff --git a/sonar-batch/src/test/java/org/sonar/batch/scan/filesystem/FileMetadataTest.java b/sonar-batch/src/test/java/org/sonar/batch/scan/filesystem/FileMetadataTest.java
index 749a87408d3..2b4c64df8a0 100644
--- a/sonar-batch/src/test/java/org/sonar/batch/scan/filesystem/FileMetadataTest.java
+++ b/sonar-batch/src/test/java/org/sonar/batch/scan/filesystem/FileMetadataTest.java
@@ -33,6 +33,7 @@ import static org.fest.assertions.Assertions.assertThat;
 public class FileMetadataTest {
 
   private static final String EXPECTED_HASH_WITHOUT_LATEST_EOL = "c80cc50d65ace6c4eb63f189d274dbeb";
+  private static final String EXPECTED_HASH_NEW_LINE_FIRST = "cf2d41454b5b451eeb5122f0848c1d2a";
   private static final String EXPECTED_HASH_WITH_LATEST_EOL = "bf77e51d219e7d7d643faac86f1b5d15";
 
   @Rule
@@ -112,6 +113,16 @@ public class FileMetadataTest {
   }
 
   @Test
+  public void start_with_newline() throws Exception {
+    File tempFile = temp.newFile();
+    FileUtils.write(tempFile, "\nfoo\nbar\r\nbaz", Charsets.UTF_8, true);
+
+    FileMetadata.Metadata metadata = FileMetadata.INSTANCE.read(tempFile, Charsets.UTF_8);
+    assertThat(metadata.lines).isEqualTo(4);
+    assertThat(metadata.hash).isEqualTo(EXPECTED_HASH_NEW_LINE_FIRST);
+  }
+
+  @Test
   public void should_throw_if_file_does_not_exist() throws Exception {
     File tempFolder = temp.newFolder();
     File file = new File(tempFolder, "doesNotExist.txt");