Fix inline diff bug

CONTRIBUTING.md

@@ -0,0 +1,11 @@
+# Contributing
+
+To contribute do the following:
+1. Check existing open issues.
+2. If not found, file an issue with any relevant information (versions, steps to reproduce, stacktrace, screenshots, etc).
+3. Fork repository.
+4. Create a branch on your fork and add the issue # to he name.  Like feature/issue-23 or bug/issue-65.
+5. Try to match the style code.
+6. Create a pull request to develop branch.
+
+Feel free to send any question.

README.md

@@ -1,12 +1,41 @@
-A fork of [java-diff-utils](https://code.google.com/p/java-diff-utils/)
+# java-diff-utils
 
-# Changelog
+The java-diff-utils library is for computing diffs, applying patches, generation side-by-side view in Java.
 
-## 2.1.0
+It is an OpenSource library for performing the comparison operations between texts: computing diffs, applying patches, generating unified diffs or parsing them, generating diff output for easy future displaying (like side-by-side view) and so on.
 
-- Removes the dependency on Guava
+Main reason to build this library was the lack of easy-to-use libraries with all the usual stuff you need while working with diff files. Originally it was inspired by JRCS library and it's nice design of diff module.
 
-## 2.0.0
+**Original code and docs were forked from:** [java-diff-utils](https://code.google.com/p/java-diff-utils/)
+
+## Main Features
+
+* computing the difference between two texts.
+* capable to hand more than plain ascci. Arrays or List of any type that implements hashCode() and equals() correctly can be subject to differencing using this library
+* patch and unpatch the text with the given patch
+* parsing the unified diff format
+* producing human-readable differences
+
+## Algorithms
+
+This library implements Myer's diff algorithm. But it can easily replaced by any other which is better for handing your texts.
+
+# Tutorial
+
+* In Spanish: [Comparar Ficheros java-diff-utils](https://www.adictosaltrabajo.com/tutoriales/comparar-ficheros-java-diff-utils/)
+
+## Changelog
+
+### 2.1.1
+
+- Bugfix: Fix issue showing inline diffs.
+- Added some unit tests.
+
+### 2.1.0
+
+- Removes the dependency on Guavatime
+
+### 2.0.0
 
 - Change groupId and artifactId to prevent conflict with origin library: now 'com.github.java-diff-utils:java-diff-utils' instead of 'jp.skypencil.java-diff-utils:diffutils'
 - Adds the ability to differentiate the inserted and deleted tags and class-names in inline-diff
@@ -18,18 +47,17 @@ A fork of [java-diff-utils](https://code.google.com/p/java-diff-utils/)
 - fix imbrication tag bug in lineDiff (when inline is on a multi-line chunk)
 - Adds tha ability to skip data
 
-## 1.5.0
+### 1.5.0
 
 - make Equalizer configurable. ([pull #1](https://github.com/eller86/java-diff-utils/pull/1))
 
-## 1.4.1
+### 1.4.1
 
 - bugfix: parse method should be public
 
-## 1.4.0
+### 1.4.0
 
 - switch from JDK5 to JDK7
 - add Guava to dependency
 - let user uses other string to represent line which does not exist
 - implement event based parser like SAX (in difflib.event package)
-

build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'java'
 apply plugin: 'maven'
 
 group = 'com.github.java-diff-utils'
-version = '2.1.0-SNAPSHOT'
+version = '2.1.1'
 
 description = """java-diff-utils"""
 

src/main/java/difflib/DiffRowGenerator.java

@@ -457,8 +457,19 @@ private void addInlineDiffs(Delta<String> delta) {
             }
         }
 
-        delta.getOriginal().setLines(Arrays.asList(Utils.join(origList, "").split(NEW_LINE)));
-        delta.getRevised().setLines(Arrays.asList(Utils.join(revList, "").split(NEW_LINE)));
+        delta.getOriginal().setLines(addMissingLines(origList, orig.size()));
+        delta.getRevised().setLines(addMissingLines(revList, rev.size()));
+    }
+
+    private List<String> addMissingLines(final List<String> lines, final int targetSize) {
+        List<String> tempList = Arrays.asList(Utils.join(lines, "").split(NEW_LINE));
+        if (tempList.size() < targetSize) {
+            tempList = new ArrayList<>(tempList);
+            while (tempList.size() < targetSize) {
+                tempList.add("");
+            }
+        }
+        return tempList;
     }
 
     private static final LinkedList<String> charArrayToStringList(char[] cs) {

src/test/java/diffutils/DiffRowGeneratorTest.java

@@ -1,13 +1,15 @@
 package diffutils;
 
-import java.util.Arrays;
-import java.util.List;
-
 import difflib.DiffRow;
 import difflib.DiffRowGenerator;
-
 import junit.framework.TestCase;
 
+import java.util.Arrays;
+import java.util.List;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
 public class DiffRowGeneratorTest  extends TestCase {
 
     public void testGenerator_Default() {
@@ -35,7 +37,7 @@ public void testGenerator_InlineDiff() {
         print(rows);
 
         assertEquals(3, rows.size());
-        assertTrue(rows.get(0).getOldLine().indexOf("<span") > 0);
+        assertTrue(rows.get(0).getOldLine().indexOf("<del>") > 0);
     }
 
     public void testGenerator_IgnoreWhitespaces() {
@@ -56,6 +58,101 @@ public void testGenerator_IgnoreWhitespaces() {
         assertEquals(rows.get(3).getTag(), DiffRow.Tag.CHANGE);
     }
 
+    public void testChangeToEmptyLine() {
+        String first = "Test \n \no\n";
+        String second ="Test\n\no\n";
+
+        DiffRowGenerator generator = new DiffRowGenerator.Builder()
+                .showInlineDiffs(true)
+                .columnWidth(Integer.MAX_VALUE) // do not wrap
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(split(first), split(second));
+        print(rows);
+
+        assertEquals(3, rows.size());
+        assertThat(rows.size(), is(3));
+        assertThat(rows.get(0).getTag(), is(DiffRow.Tag.CHANGE));
+        assertThat(rows.get(0).getOldLine().indexOf("<del>"), is(4));
+        assertThat(rows.get(1).getTag(), is(DiffRow.Tag.CHANGE));
+        assertThat(rows.get(1).getOldLine().indexOf("<del>"), is(0));
+        assertThat(rows.get(2).getTag(), is(DiffRow.Tag.EQUAL));
+    }
+
+    public void testChangeToTwoEmptyLine() {
+        String first = "One\n \nTwo\n \nThree\n";
+        String second ="One\n\nTwo\n\nThree\n";
+
+        DiffRowGenerator generator = new DiffRowGenerator.Builder()
+                .showInlineDiffs(true)
+                .columnWidth(Integer.MAX_VALUE) // do not wrap
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(split(first), split(second));
+        print(rows);
+
+        assertEquals(5, rows.size());
+        assertThat(rows.get(0).getTag(), is(DiffRow.Tag.EQUAL));
+
+        assertThat(rows.get(1).getTag(), is(DiffRow.Tag.CHANGE));
+        assertThat(rows.get(1).getOldLine().indexOf("<del>"), is(0));
+
+        assertThat(rows.get(2).getTag(), is(DiffRow.Tag.EQUAL));
+
+        assertThat(rows.get(3).getTag(), is(DiffRow.Tag.CHANGE));
+        assertThat(rows.get(3).getOldLine().indexOf("<del>"), is(0));
+
+    }
+
+    public void testDeleteLine() {
+        String first ="Equal Line\nDeleted Line\nEqual Line 2\n";
+        String second = "Equal Line\nEqual Line 2\n";
+
+        DiffRowGenerator generator = new DiffRowGenerator.Builder()
+                .showInlineDiffs(true)
+                .columnWidth(Integer.MAX_VALUE) // do not wrap
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(split(first), split(second));
+        print(rows);
+
+        assertThat(rows.size(), is(3));
+        assertThat(rows.get(0).getTag(), is(DiffRow.Tag.EQUAL));
+        assertThat(rows.get(1).getTag(), is(DiffRow.Tag.DELETE));
+        assertThat(rows.get(2).getTag(), is(DiffRow.Tag.EQUAL));
+    }
+
+    public void testInsertedLine() {
+        String first = "Equal Line\nEqual Line 2\n";
+        String second = "Equal Line\nDeleted Line\nEqual Line 2\n";
+
+        DiffRowGenerator generator = new DiffRowGenerator.Builder()
+                .showInlineDiffs(true)
+                .columnWidth(Integer.MAX_VALUE) // do not wrap
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(split(first), split(second));
+        print(rows);
+
+        assertThat(rows.size(), is(3));
+        assertThat(rows.get(0).getTag(), is(DiffRow.Tag.EQUAL));
+        assertThat(rows.get(1).getTag(), is(DiffRow.Tag.INSERT));
+        assertThat(rows.get(2).getTag(), is(DiffRow.Tag.EQUAL));
+    }
+
+    public void testChangedLine() {
+        String first = "Equal Line\nLine to be changed\nEqual Line 2\n";
+        String second = "Equal Line\nLine changed test\nEqual Line 2\n";
+
+        DiffRowGenerator generator = new DiffRowGenerator.Builder()
+                .showInlineDiffs(true)
+                .columnWidth(Integer.MAX_VALUE) // do not wrap
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(split(first), split(second));
+        print(rows);
+
+        assertThat(rows.size(), is(3));
+        assertThat(rows.get(0).getTag(), is(DiffRow.Tag.EQUAL));
+        assertThat(rows.get(1).getTag(), is(DiffRow.Tag.CHANGE));
+        assertThat(rows.get(2).getTag(), is(DiffRow.Tag.EQUAL));
+    }
+
     private List<String> split(String content) {
         return Arrays.asList(content.split("\n"));
     }