private MergeResult mergeModified()

in org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/MergeTool.java [203:336]
125 lines of code
18 McCabe index (conditional complexity)

	private MergeResult mergeModified(String mergedFilePath, boolean showPrompt)
			throws Exception {
		outw.println(MessageFormat.format(CLIText.get().mergeToolNormalConflict,
				mergedFilePath));
		outw.flush();
		boolean isMergeSuccessful = true;
		ContentSource baseSource = ContentSource.create(db.newObjectReader());
		ContentSource localSource = ContentSource.create(db.newObjectReader());
		ContentSource remoteSource = ContentSource.create(db.newObjectReader());
		// temporary directory if mergetool.writeToTemp == true
		File tempDir = mergeTools.createTempDirectory();
		// the parent directory for temp files (can be same as tempDir or just
		// the worktree dir)
		File tempFilesParent = tempDir != null ? tempDir : db.getWorkTree();
		try {
			FileElement base = null;
			FileElement local = null;
			FileElement remote = null;
			FileElement merged = new FileElement(mergedFilePath, Type.MERGED,
					db.getWorkTree());
			DirCache cache = db.readDirCache();
			try (RevWalk revWalk = new RevWalk(db);
					TreeWalk treeWalk = new TreeWalk(db,
							revWalk.getObjectReader())) {
				treeWalk.setFilter(
						PathFilterGroup.createFromStrings(mergedFilePath));
				DirCacheIterator cacheIter = new DirCacheIterator(cache);
				treeWalk.addTree(cacheIter);
				while (treeWalk.next()) {
					if (treeWalk.isSubtree()) {
						treeWalk.enterSubtree();
						continue;
					}
					final EolStreamType eolStreamType = treeWalk
							.getEolStreamType(CHECKOUT_OP);
					final String filterCommand = treeWalk.getFilterCommand(
							Constants.ATTR_FILTER_TYPE_SMUDGE);
					WorkingTreeOptions opt = db.getConfig()
							.get(WorkingTreeOptions.KEY);
					CheckoutMetadata checkoutMetadata = new CheckoutMetadata(
							eolStreamType, filterCommand);
					DirCacheEntry entry = treeWalk
							.getTree(DirCacheIterator.class).getDirCacheEntry();
					if (entry == null) {
						continue;
					}
					ObjectId id = entry.getObjectId();
					switch (entry.getStage()) {
					case DirCacheEntry.STAGE_1:
						base = new FileElement(mergedFilePath, Type.BASE);
						DirCacheCheckout.getContent(db, mergedFilePath,
								checkoutMetadata,
								baseSource.open(mergedFilePath, id), opt,
								new FileOutputStream(
										base.createTempFile(tempFilesParent)));
						break;
					case DirCacheEntry.STAGE_2:
						local = new FileElement(mergedFilePath, Type.LOCAL);
						DirCacheCheckout.getContent(db, mergedFilePath,
								checkoutMetadata,
								localSource.open(mergedFilePath, id), opt,
								new FileOutputStream(
										local.createTempFile(tempFilesParent)));
						break;
					case DirCacheEntry.STAGE_3:
						remote = new FileElement(mergedFilePath, Type.REMOTE);
						DirCacheCheckout.getContent(db, mergedFilePath,
								checkoutMetadata,
								remoteSource.open(mergedFilePath, id), opt,
								new FileOutputStream(remote
										.createTempFile(tempFilesParent)));
						break;
					}
				}
			}
			if ((local == null) || (remote == null)) {
				throw die(MessageFormat.format(CLIText.get().mergeToolDied,
						mergedFilePath));
			}
			long modifiedBefore = merged.getFile().lastModified();
			try {
				// TODO: check how to return the exit-code of the
				// tool to jgit / java runtime ?
				// int rc =...
				Optional<ExecutionResult> optionalResult = mergeTools.merge(
						local, remote, merged, base, tempDir, toolName, prompt,
						gui, this::promptForLaunch, this::informUserNoTool);
				if (optionalResult.isPresent()) {
					ExecutionResult result = optionalResult.get();
					Charset defaultCharset = SystemReader.getInstance()
							.getDefaultCharset();
					outw.println(new String(result.getStdout().toByteArray(),
							defaultCharset));
					outw.flush();
					errw.println(new String(result.getStderr().toByteArray(),
							defaultCharset));
					errw.flush();
				} else {
					return MergeResult.ABORTED;
				}
			} catch (ToolException e) {
				isMergeSuccessful = false;
				outw.println(e.getResultStdout());
				outw.flush();
				errw.println(e.getMessage());
				errw.println(MessageFormat.format(
						CLIText.get().mergeToolMergeFailed, mergedFilePath));
				errw.flush();
				if (e.isCommandExecutionError()) {
					throw die(CLIText.get().mergeToolExecutionError, e);
				}
			}
			// if merge was successful check file modified
			if (isMergeSuccessful) {
				long modifiedAfter = merged.getFile().lastModified();
				if (modifiedBefore == modifiedAfter) {
					outw.println(MessageFormat.format(
							CLIText.get().mergeToolFileUnchanged,
							mergedFilePath));
					isMergeSuccessful = !showPrompt || isMergeSuccessful();
				}
			}
			// if automatically or manually successful
			// -> add the file to the index
			if (isMergeSuccessful) {
				addFile(mergedFilePath);
			}
		} finally {
			baseSource.close();
			localSource.close();
			remoteSource.close();
		}
		return isMergeSuccessful ? MergeResult.SUCCESSFUL : MergeResult.FAILED;
	}