protected void run()

in org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Merge.java [91:214]
116 lines of code
31 McCabe index (conditional complexity)

	protected void run() {
		if (squash && ff == FastForwardMode.NO_FF) {
			throw die(CLIText.get().cannotCombineSquashWithNoff);
		}
		// determine the merge strategy
		if (strategyName != null) {
			mergeStrategy = MergeStrategy.get(strategyName);
			if (mergeStrategy == null) {
				throw die(MessageFormat.format(
						CLIText.get().unknownMergeStrategy, strategyName));
			}
		}

		try {
			// determine the other revision we want to merge with HEAD
			final Ref srcRef = db.findRef(ref);
			final ObjectId src = db.resolve(ref + "^{commit}"); //$NON-NLS-1$
			if (src == null) {
				throw die(MessageFormat
						.format(CLIText.get().refDoesNotExistOrNoCommit, ref));
			}

			Ref oldHead = getOldHead();
			MergeResult result;
			try (Git git = new Git(db)) {
				MergeCommand mergeCmd = git.merge()
						.setStrategy(mergeStrategy)
						.setContentMergeStrategy(contentStrategy)
						.setSquash(squash)
						.setFastForward(ff)
						.setCommit(!noCommit);
				if (srcRef != null) {
					mergeCmd.include(srcRef);
				} else {
					mergeCmd.include(src);
				}

				if (message != null) {
					mergeCmd.setMessage(message);
				}

				try {
					result = mergeCmd.call();
				} catch (CheckoutConflictException e) {
					result = new MergeResult(e.getConflictingPaths()); // CHECKOUT_CONFLICT
				}
			}

			switch (result.getMergeStatus()) {
			case ALREADY_UP_TO_DATE:
				if (squash) {
					outw.print(CLIText.get().nothingToSquash);
				}
				outw.println(CLIText.get().alreadyUpToDate);
				break;
			case FAST_FORWARD:
				ObjectId oldHeadId = oldHead.getObjectId();
				if (oldHeadId != null) {
					String oldId = oldHeadId
							.abbreviate(OBJECT_ID_ABBREV_STRING_LENGTH).name();
					String newId = result.getNewHead()
							.abbreviate(OBJECT_ID_ABBREV_STRING_LENGTH).name();
					outw.println(MessageFormat.format(CLIText.get().updating,
							oldId, newId));
				}
				outw.println(result.getMergeStatus().toString());
				break;
			case CHECKOUT_CONFLICT:
				outw.println(CLIText.get().mergeCheckoutConflict);
				for (String collidingPath : result.getCheckoutConflicts()) {
					outw.println("\t" + collidingPath); //$NON-NLS-1$
				}
				outw.println(CLIText.get().mergeCheckoutFailed);
				break;
			case CONFLICTING:
				for (String collidingPath : result.getConflicts().keySet())
					outw.println(MessageFormat.format(
							CLIText.get().mergeConflict, collidingPath));
				outw.println(CLIText.get().mergeFailed);
				break;
			case FAILED:
				for (Map.Entry<String, MergeFailureReason> entry : result
						.getFailingPaths().entrySet())
					switch (entry.getValue()) {
					case DIRTY_WORKTREE:
					case DIRTY_INDEX:
						outw.println(CLIText.get().dontOverwriteLocalChanges);
						outw.println("        " + entry.getKey()); //$NON-NLS-1$
						break;
					case COULD_NOT_DELETE:
						outw.println(CLIText.get().cannotDeleteFile);
						outw.println("        " + entry.getKey()); //$NON-NLS-1$
						break;
					}
				break;
			case MERGED:
				MergeStrategy strategy = isMergedInto(oldHead, src)
						? MergeStrategy.RECURSIVE
						: mergeStrategy;
				outw.println(MessageFormat.format(CLIText.get().mergeMadeBy,
						strategy.getName()));
				break;
			case MERGED_NOT_COMMITTED:
				outw.println(
						CLIText.get().mergeWentWellStoppedBeforeCommitting);
				break;
			case MERGED_SQUASHED:
			case FAST_FORWARD_SQUASHED:
			case MERGED_SQUASHED_NOT_COMMITTED:
				outw.println(CLIText.get().mergedSquashed);
				outw.println(
						CLIText.get().mergeWentWellStoppedBeforeCommitting);
				break;
			case ABORTED:
				throw die(CLIText.get().ffNotPossibleAborting);
			case NOT_SUPPORTED:
				outw.println(MessageFormat.format(
						CLIText.get().unsupportedOperation, result.toString()));
			}
		} catch (GitAPIException | IOException e) {
			throw die(e.getMessage(), e);
		}

	}