jgit/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/DiffFormatterTest.java

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package org.eclipse.jgit.diff;

import static org.junit.Assert.assertEquals;

import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.RepositoryTestCase;
import org.eclipse.jgit.patch.FileHeader;
import org.eclipse.jgit.patch.HunkHeader;
import org.eclipse.jgit.util.RawParseUtils;
import org.eclipse.jgit.util.io.DisabledOutputStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class DiffFormatterTest extends RepositoryTestCase {
	private static final String DIFF = "diff --git ";

	private static final String REGULAR_FILE = "100644";

	private static final String GITLINK = "160000";

	private static final String PATH_A = "src/a";

	private static final String PATH_B = "src/b";

	private DiffFormatter df;

	private TestRepository testDb;

	@Override
	@Before
	public void setUp() throws Exception {
		super.setUp();
		testDb = new TestRepository(db);
		df = new DiffFormatter(DisabledOutputStream.INSTANCE);
		df.setRepository(db);
		df.setAbbreviationLength(8);
	}

	@Override
	@After
	public void tearDown() throws Exception {
		if (df != null)
			df.release();
		super.tearDown();
	}

	@Test
	public void testCreateFileHeader_Add() throws Exception {
		ObjectId adId = blob("a\nd\n");
		DiffEntry ent = DiffEntry.add("FOO", adId);
		FileHeader fh = df.toFileHeader(ent);

		String diffHeader = "diff --git a/FOO b/FOO\n" //
				+ "new file mode " + REGULAR_FILE + "\n"
				+ "index "
				+ ObjectId.zeroId().abbreviate(8).name()
				+ ".."
				+ adId.abbreviate(8).name() + "\n" //
				+ "--- /dev/null\n"//
				+ "+++ b/FOO\n";
		assertEquals(diffHeader, RawParseUtils.decode(fh.getBuffer()));

		assertEquals(0, fh.getStartOffset());
		assertEquals(fh.getBuffer().length, fh.getEndOffset());
		assertEquals(FileHeader.PatchType.UNIFIED, fh.getPatchType());

		assertEquals(1, fh.getHunks().size());

		HunkHeader hh = fh.getHunks().get(0);
		assertEquals(1, hh.toEditList().size());

		EditList el = hh.toEditList();
		assertEquals(1, el.size());

		Edit e = el.get(0);
		assertEquals(0, e.getBeginA());
		assertEquals(0, e.getEndA());
		assertEquals(0, e.getBeginB());
		assertEquals(2, e.getEndB());
		assertEquals(Edit.Type.INSERT, e.getType());
	}

	@Test
	public void testCreateFileHeader_Delete() throws Exception {
		ObjectId adId = blob("a\nd\n");
		DiffEntry ent = DiffEntry.delete("FOO", adId);
		FileHeader fh = df.toFileHeader(ent);

		String diffHeader = "diff --git a/FOO b/FOO\n" //
				+ "deleted file mode " + REGULAR_FILE + "\n"
				+ "index "
				+ adId.abbreviate(8).name()
				+ ".."
				+ ObjectId.zeroId().abbreviate(8).name() + "\n" //
				+ "--- a/FOO\n"//
				+ "+++ /dev/null\n";
		assertEquals(diffHeader, RawParseUtils.decode(fh.getBuffer()));

		assertEquals(0, fh.getStartOffset());
		assertEquals(fh.getBuffer().length, fh.getEndOffset());
		assertEquals(FileHeader.PatchType.UNIFIED, fh.getPatchType());

		assertEquals(1, fh.getHunks().size());

		HunkHeader hh = fh.getHunks().get(0);
		assertEquals(1, hh.toEditList().size());

		EditList el = hh.toEditList();
		assertEquals(1, el.size());

		Edit e = el.get(0);
		assertEquals(0, e.getBeginA());
		assertEquals(2, e.getEndA());
		assertEquals(0, e.getBeginB());
		assertEquals(0, e.getEndB());
		assertEquals(Edit.Type.DELETE, e.getType());
	}

	@Test
	public void testCreateFileHeader_Modify() throws Exception {
		ObjectId adId = blob("a\nd\n");
		ObjectId abcdId = blob("a\nb\nc\nd\n");

		String diffHeader = makeDiffHeader(PATH_A, PATH_A, adId, abcdId);

		DiffEntry ad = DiffEntry.delete(PATH_A, adId);
		DiffEntry abcd = DiffEntry.add(PATH_A, abcdId);

		DiffEntry mod = DiffEntry.pair(ChangeType.MODIFY, ad, abcd, 0);

		FileHeader fh = df.toFileHeader(mod);

		assertEquals(diffHeader, RawParseUtils.decode(fh.getBuffer()));
		assertEquals(0, fh.getStartOffset());
		assertEquals(fh.getBuffer().length, fh.getEndOffset());
		assertEquals(FileHeader.PatchType.UNIFIED, fh.getPatchType());

		assertEquals(1, fh.getHunks().size());

		HunkHeader hh = fh.getHunks().get(0);
		assertEquals(1, hh.toEditList().size());

		EditList el = hh.toEditList();
		assertEquals(1, el.size());

		Edit e = el.get(0);
		assertEquals(1, e.getBeginA());
		assertEquals(1, e.getEndA());
		assertEquals(1, e.getBeginB());
		assertEquals(3, e.getEndB());
		assertEquals(Edit.Type.INSERT, e.getType());
	}

	@Test
	public void testCreateFileHeader_Binary() throws Exception {
		ObjectId adId = blob("a\nd\n");
		ObjectId binId = blob("a\nb\nc\n\0\0\0\0d\n");

		String diffHeader = makeDiffHeader(PATH_A, PATH_B, adId, binId)
				+ "Binary files differ\n";

		DiffEntry ad = DiffEntry.delete(PATH_A, adId);
		DiffEntry abcd = DiffEntry.add(PATH_B, binId);

		DiffEntry mod = DiffEntry.pair(ChangeType.MODIFY, ad, abcd, 0);

		FileHeader fh = df.toFileHeader(mod);

		assertEquals(diffHeader, RawParseUtils.decode(fh.getBuffer()));
		assertEquals(FileHeader.PatchType.BINARY, fh.getPatchType());

		assertEquals(1, fh.getHunks().size());

		HunkHeader hh = fh.getHunks().get(0);
		assertEquals(0, hh.toEditList().size());
	}

	@Test
	public void testCreateFileHeader_GitLink() throws Exception {
		ObjectId aId = blob("a\n");
		ObjectId bId = blob("b\n");

		String diffHeader = makeDiffHeaderModeChange(PATH_A, PATH_A, aId, bId,
				GITLINK, REGULAR_FILE)
				+ "-Subproject commit " + aId.name() + "\n";

		DiffEntry ad = DiffEntry.delete(PATH_A, aId);
		ad.oldMode = FileMode.GITLINK;
		DiffEntry abcd = DiffEntry.add(PATH_A, bId);

		DiffEntry mod = DiffEntry.pair(ChangeType.MODIFY, ad, abcd, 0);

		FileHeader fh = df.toFileHeader(mod);

		assertEquals(diffHeader, RawParseUtils.decode(fh.getBuffer()));

		assertEquals(1, fh.getHunks().size());

		HunkHeader hh = fh.getHunks().get(0);
		assertEquals(0, hh.toEditList().size());
	}

	private String makeDiffHeader(String pathA, String pathB, ObjectId aId,
			ObjectId bId) {
		String a = aId.abbreviate(8).name();
		String b = bId.abbreviate(8).name();
		return DIFF + "a/" + pathA + " " + "b/" + pathB + "\n" + //
				"index " + a + ".." + b + " " + REGULAR_FILE + "\n" + //
				"--- a/" + pathA + "\n" + //
				"+++ b/" + pathB + "\n";
	}

	private String makeDiffHeaderModeChange(String pathA, String pathB,
			ObjectId aId, ObjectId bId, String modeA, String modeB) {
		String a = aId.abbreviate(8).name();
		String b = bId.abbreviate(8).name();
		return DIFF + "a/" + pathA + " " + "b/" + pathB + "\n" + //
				"old mode " + modeA + "\n" + //
				"new mode " + modeB + "\n" + //
				"index " + a + ".." + b + "\n" + //
				"--- a/" + pathA + "\n" + //
				"+++ b/" + pathB + "\n";
	}

	private ObjectId blob(String content) throws Exception {
		return testDb.blob(content).copy();
	}
}