gitlet/gitlet/gitlet/Repository.java at master · xUser5000/gitlet · GitHub

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package gitlet;

import java.io.File;

import java.io.IOException;

import java.util.*;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.stream.Collectors;

import static gitlet.Utils.*;

/** Represents a gitlet repository.

* @author xUser5000

public class Repository {

/** The current working directory. */

private final File CWD;

/** The .gitlet directory. */

private final File GITLET_DIR;

private final File COMMITS_DIR;

private final File BLOBS_DIR;

private final File BRANCHES_DIR;

private final File HEAD_FILE;

private final File STAGED_DIR;

private final File ADDITION_DIR;

private final File REMOVAL_DIR;

private final File REMOTE_DIR;

private final WorkingArea workingArea;

private final CommitStore commitStore;

private final BranchStore branchStore;

private final StagingArea stagingArea;

private final Head head;

private final BlobStore blobStore;

private final RemoteStore remoteStore;

public Repository(String currentWorkingDirectory) {

if (currentWorkingDirectory == null || currentWorkingDirectory.isBlank()) {

throw new RuntimeException("Working directory not found.");

}

CWD = new File(currentWorkingDirectory);

if (!CWD.exists()) {

throw new RuntimeException("Working directory not found.");

}

GITLET_DIR = join(CWD, ".gitlet");

COMMITS_DIR = join(GITLET_DIR, "commits");

BLOBS_DIR = join(GITLET_DIR, "blobs");

BRANCHES_DIR = join(GITLET_DIR, "branches");

HEAD_FILE = join(GITLET_DIR, "HEAD");

STAGED_DIR = join(GITLET_DIR, "staged");

ADDITION_DIR = join(STAGED_DIR, "addition");

REMOVAL_DIR = join(STAGED_DIR, "removal");

REMOTE_DIR = join(GITLET_DIR, "remote");

workingArea = new WorkingArea(CWD);

commitStore = new CommitStore(COMMITS_DIR);

branchStore = new BranchStore(BRANCHES_DIR);

stagingArea = new StagingArea(ADDITION_DIR, REMOVAL_DIR);

head = new Head(HEAD_FILE);

blobStore = new BlobStore(BLOBS_DIR);

remoteStore = new RemoteStore(REMOTE_DIR);

}

/**

* Initialize the directory structure inside .gitlet

* Start with a single branch called "master"

* Start with one commit with the message "initial commit" with a timestamp = Unix epoch

* Set HEAD to point to the master branch

public void init() throws IOException {

if (GITLET_DIR.exists()) {

exitWithMessage("A Gitlet version-control system already exists in the current directory.");

}

GITLET_DIR.mkdir();

COMMITS_DIR.mkdir();

BLOBS_DIR.mkdir();

BRANCHES_DIR.mkdir();

STAGED_DIR.mkdir();

ADDITION_DIR.mkdir();

REMOVAL_DIR.mkdir();

HEAD_FILE.createNewFile();

Commit initialCommit = new Commit.Builder("initial commit").timestamp(new Date(0)).build();

commitStore.saveCommit(initialCommit);

Branch masterBranch = new Branch("master", initialCommit.getHash());

branchStore.saveBranch(masterBranch);

setCurrentBranch(masterBranch);

}

/**

* Add a file in the working directory to the staging area

* If the file does not exist, print `File does not exist.`

* If the current working version of the file is identical to the version in the current commit,

* do not stage it to be added, and remove it from the staging area if it is already there.

* Staging an already-staged file overwrites the previous entry in the staging area with the new contents.

* Stage the file for addition

* If the file was staged for removal, it will no longer be after executing the command

public void add(String fileName) {

checkInitializedGitletDirectory();

File workingFile = workingArea.getFile(fileName);

if (workingFile == null) {

exitWithMessage("File does not exist.");

}

String committedFileHash = getCurrentCommit().getTrackedFiles().get(fileName);

String workingFileHash = sha1(readContentsAsString(workingFile));

if (!workingFileHash.equals(committedFileHash)) {

stagingArea.stageForAddition(workingFile);

} else {

stagingArea.unstageForAddition(fileName);

}

stagingArea.unstageForRemoval(fileName);

}

/**

* If the commit message is empty, print `Please enter a commit message.`

* If no files have been staged, print `No changes added to the commit.`

* For each added/modified files in the staging area,

* - Compute its SHA-1 hash as a function of its contents

* - Copy it to the blobs directory and set its to its SHA-1 hash

* Build the commit

* - Reuse all tracked files from the parent commit

* - Rewire the references of the added/modified files

* - Untrack removed files

* - Point to the parent commit

* Save the commit on disk

* Update the pointer of the current branch to point to the new commit

* Clear the staging area

public void commit(String message) {

checkInitializedGitletDirectory();

commit(message, null);

}

private void commit(String message, String secondaryParent) {

if (message.isEmpty()) {

exitWithMessage("Please enter a commit message.");

}

if (stagingArea.isEmpty()) {

exitWithMessage("No changes added to the commit.");

}

/* Compute the SHA-1 hash of added/modified files and store them in the blobs directory */

Map<String, String> nameToBlob = new TreeMap<>();

stagingArea.getFilesForAddition().forEach(file -> {

File storedBlob = blobStore.save(file);

nameToBlob.put(file.getName(), storedBlob.getName());

});

/* update the tracked list of files */

Map<String, String> trackedFiles = getCurrentCommit().getTrackedFiles();

trackedFiles.putAll(nameToBlob);

stagingArea.getFilesForRemoval().forEach(file -> trackedFiles.remove(file.getName()));

Commit newCommit = new Commit.Builder(message)

.parent(getCurrentCommit().getHash())

.secondaryParent(secondaryParent)

.trackedFiles(trackedFiles)

.build();

commitStore.saveCommit(newCommit);

Branch branch = getCurrentBranch();

branch.setCommit(newCommit.getHash());

branchStore.saveBranch(branch);

stagingArea.clear();

}

/**

* If the file is neither staged nor tracked by the head commit, print `No reason to remove the file.`

* If the file is currently staged for addition, unstage it

* If the file is tracked in the current commit,

* - stage it for removal

* - remove it from the working directory if the user has not already done so

public void rm(String filename) {

checkInitializedGitletDirectory();

File stagedForAdditionFile = stagingArea.getFileForAddition(filename);

Map<String, String> trackedFiles = getCurrentCommit().getTrackedFiles();

if (stagedForAdditionFile == null && !trackedFiles.containsKey(filename)) {

exitWithMessage("No reason to remove the file.");

}

if (stagedForAdditionFile != null) {

stagingArea.unstageForAddition(filename);

}

if (trackedFiles.containsKey(filename)) {

File trackedFile = blobStore.get(trackedFiles.get(filename));

stagingArea.stageForRemoval(readContentsAsString(trackedFile), filename);

workingArea.deleteFile(filename);

}

/**

* Display information about each commit backwards along the commit tree

* starting from the commit in the current HEAD until the initial commit

* More info in Commit::log()

public void log() {

checkInitializedGitletDirectory();

getCommitChain(getCurrentCommit()).stream()

.map(Commit::log)

.forEach(System.out::print);

}

/**

* Like log, except displays information about all commits ever made.

* The order of the commits does not matter

public void globalLog() {

checkInitializedGitletDirectory();

commitStore

.allCommitsStream()

.map(Commit::log)

.forEach(System.out::print);

}

/**

* Prints out the ids of all commits that have the given commit message, one per line

* If no such commit exists, print `Found no commit with that message.`

public void find(String commitMessage) {

checkInitializedGitletDirectory();

List<Commit> matchedCommits = commitStore.getCommitsByMessage(commitMessage);

if (matchedCommits.isEmpty()) {

exitWithMessage("Found no commit with that message.");

}

matchedCommits.stream()

.map(Commit::getHash)

.forEach(System.out::println);

}

/**

* Displays what branches currently exist, and marks the current branch with a *

* Displays what files have been staged for addition or removal

* Entries are listed in lexicographic order

* A file in the working directory is “modified but not staged” if it is

* - Tracked in the current commit, changed in the working directory, but not staged; or

* - Staged for addition, but with different contents than in the working directory; or

* - Staged for addition, but deleted in the working directory; or

* - Not staged for removal, but tracked in the current commit and deleted from the working directory.

* “Untracked Files” is for files present in the working directory but neither staged for addition nor tracked

* - This includes files that have been staged for removal, but then re-created without Gitlet’s knowledge

public void status() {

checkInitializedGitletDirectory();

System.out.println("=== Branches ===");

List<Branch> branches = branchStore.allBranches();

Branch currentBranch = getCurrentBranch();

branches.forEach(branch -> {

if (branch.getName().equals(currentBranch.getName())) {

System.out.print("*");

}

System.out.println(branch.getName());

});

System.out.println();

System.out.println("=== Staged Files ===");

List<File> addedFiles = stagingArea.getFilesForAddition();

addedFiles.stream().map(File::getName).forEach(System.out::println);

System.out.println();

System.out.println("=== Removed Files ===");

List<File> removedFiles = stagingArea.getFilesForRemoval();

removedFiles.stream().map(File::getName).forEach(System.out::println);

System.out.println();

System.out.println("=== Modifications Not Staged For Commit ===");

// TODO: Modifications not staged for commit

System.out.println();

System.out.println("=== Untracked Files ===");

// TODO: Untracked files

System.out.println();

}

/**

* Takes the version of the file as it exists in the commit with the given id, and puts it in the working directory,

* overwriting the version of the file that’s already there if there is one.

* If no commit with the given id exists, print `No commit with that id exists.`

* If the file does not exist in the previous commit, print `File does not exist in that commit.`

* The new version of the file is not staged.

public void checkoutFile(String commitHash, String fileName) {

checkInitializedGitletDirectory();

Commit commit = commitStore.getCommitByHash(commitHash);

if (commit == null) {

exitWithMessage("No commit with that id exists.");

}

String blobHash = commit.getTrackedFiles().get(fileName);

if (blobHash == null) {

exitWithMessage("File does not exist in that commit.");

}

File blob = blobStore.get(blobHash);

String blobContents = readContentsAsString(blob);

workingArea.saveFile(blobContents, fileName);

}

/**

* same as checkoutFile(String commitHash, String fileName) except that commitHash is the current commit hash

public void checkoutFile(String fileName) {

checkInitializedGitletDirectory();

checkoutFile(getCurrentCommit().getHash(), fileName);

}

/**

* Reset the current working directory to a given commit

* If a working file is untracked in the current branch and would be overwritten by the checkout,

* print `There is an untracked file in the way; delete it, or add and commit it first.`

* Clears the staging area

private void checkoutCommit(Commit targetCommit) {

if (workingArea.allFiles().stream()

.map(File::getName)

.filter(fileName -> !getCurrentCommit().getTrackedFiles().containsKey(fileName))

.anyMatch(fileName -> targetCommit.getTrackedFiles().containsKey(fileName))

) {

exitWithMessage("There is an untracked file in the way; delete it, or add and commit it first.");

}

workingArea.clear();

stagingArea.clear();

targetCommit.getTrackedFiles().keySet().forEach(fileName -> checkoutFile(targetCommit.getHash(), fileName));

}

/**

* Takes all files in the commit at the head of the given branch, and puts them in the working directory,

* overwriting the versions of the files that are already there if they exist

* If that branch is the current branch, print `No need to checkout the current branch.`

* If no branch with that name exists, print `No such branch exists.`

* Any files that are tracked in the current branch but are not present in the checked-out branch are deleted

* The staging area is cleared, unless the checked-out branch is the current branch

* Given branch will now be considered the current branch (HEAD)

public void checkoutBranch(String targetBranchName) {

checkInitializedGitletDirectory();

Branch currentBranch = getCurrentBranch();

if (targetBranchName.equals(currentBranch.getName())) {

exitWithMessage("No need to checkout the current branch.");

}

Branch targetBranch = branchStore.getBranch(targetBranchName);

if (targetBranch == null) {

exitWithMessage("No such branch exists.");

}

Commit targetCommit = commitStore.getCommitByHash(targetBranch.getCommitHash());

checkoutCommit(targetCommit);

setCurrentBranch(targetBranch);

}

/**

* Creates a new branch with the given name, and points it at the current head commit

* This command does NOT immediately switch to the newly created branch (just as in real Git)

* If a branch with the given name already exists, print the error message `A branch with that name already exists`

public void branch(String branchName) {

checkInitializedGitletDirectory();

if (branchStore.getBranch(branchName) != null) {

exitWithMessage("A branch with that name already exists");

}

Branch branch = new Branch(branchName, getCurrentBranch().getCommitHash());

branchStore.saveBranch(branch);

}

/**

* Deletes the branch with the given name

* If a branch with the given name does not exist, print `A branch with that name does not exist.`

* If applied to the branch we are currently in, print `Cannot remove the current branch.`

public void rmBranch(String branchName) {

checkInitializedGitletDirectory();

if (getCurrentBranch().getName().equals(branchName)) {

exitWithMessage("Cannot remove the current branch.");

}

Branch branch = branchStore.getBranch(branchName);

if (branch == null) {

exitWithMessage("A branch with that name does not exist.");

}

branchStore.removeBranch(branch);

}

/**

* Checks out all the files tracked by the given commit

* The [commit id] may be abbreviated as for checkout

* If no commit with the given id exists, print `No commit with that id exists.`

* If a working file is untracked in the current branch and would be overwritten by the reset,

* print `There is an untracked file in the way; delete it, or add and commit it first.`

* Remove tracked files that are not present in that commit

* Clear the staging area

* Move the current branch’s head to that commit

public void reset(String commitHash) {

checkInitializedGitletDirectory();

Commit targetCommit = commitStore.getCommitByHash(commitHash);

if (targetCommit == null) {

exitWithMessage("No commit with that id exists.");

}

checkoutCommit(targetCommit);

Branch currentBranch = getCurrentBranch();

currentBranch.setCommit(targetCommit);

branchStore.saveBranch(currentBranch);

}

/**

* Merges files from the given branch into the current branch.

* If the staging area is not empty, print `You have uncommitted changes.`

* If a branch with the given name does not exist, print `A branch with that name does not exist.`

* If curren branch == given branch, print `Cannot merge a branch with itself.`

* If an untracked file in the current commit would be overwritten or deleted by the merge,

* print `There is an untracked file in the way; delete it, or add and commit it first.`

* If the split point is the same commit as the given branch,

* - do nothing

* - print `Given branch is an ancestor of the current branch.`

* - merge is complete

* If the split point is the current branch,

* - check out the given branch,

* - print `Current branch fast-forwarded.`

* - merge is complete

* Merging rules (denoting the current branch as HEAD, the given branch as OTHER, and the split commit as SPLIT):

* 1. If the file is modified in OTHER but not HEAD, use the version in OTHER

* 2. If the file is modified in HEAD but not OTHER, use the version in HEAD

* 3. If the file is modified in OTHER and HEAD,

* 3.a. if HEAD and OTHER are modified in the same way, do nothing

* 3.b. if HEAD and OTHER are modified in different ways, conflict

* 4. If the file is not in SPLIT nor OTHER but in HEAD, use the version in HEAD

* 5. If the file is not in SPLIT nor HEAD but in OTHER, use the version in OTHER

* 6. If the file is unmodified in HEAD but not present in OTHER, remove

* 7. If the file is unmodified in OTHER but not present in HEAD, remain removed

* Whenever the resulting file of the merge is different from its version in HEAD,

* add it to the staging area

* When a conflict occurs, fill the conflicted file with the following:

* ```

* <<<<<<< HEAD

* contents of file in current branch

* =======

* contents of file in given branch

* >>>>>>>

* ```

* Once files have been updated according to the above rules,

* - commit with the message: `Merged [given branch name] into [current branch name].`

* - if the merge encountered a conflict, print the message `Encountered a merge conflict.`

public void merge(String branchName) {

checkInitializedGitletDirectory();

if (!stagingArea.isEmpty()) {

exitWithMessage("You have uncommitted changes.");

}

Branch targetBranch = branchStore.getBranch(branchName);

if (targetBranch == null) {

exitWithMessage("A branch with that name does not exist.");

}

Branch currentBranch = getCurrentBranch();

if (targetBranch.getName().equals(currentBranch.getName())) {

exitWithMessage("Cannot merge a branch with itself.");

}

if (workingArea.allFiles().stream()

.anyMatch(file -> !getCurrentCommit().getTrackedFiles().containsKey(file.getName()))

) {

exitWithMessage("There is an untracked file in the way; delete it, or add and commit it first.");

}

final Commit HEAD_COMMIT = commitStore.getCommitByHash(currentBranch.getCommitHash());

final Commit OTHER_COMMIT = commitStore.getCommitByHash(targetBranch.getCommitHash());

final Commit SPLIT_COMMIT = splitPoint(currentBranch, targetBranch);

if (SPLIT_COMMIT.equals(OTHER_COMMIT)) {

exitWithMessage("Given branch is an ancestor of the current branch.");

}

if (SPLIT_COMMIT.equals(HEAD_COMMIT)) {

checkoutBranch(targetBranch.getName());

exitWithMessage("Current branch fast-forwarded.");

}

Set<String> filePool = new HashSet<>();

filePool.addAll(SPLIT_COMMIT.getTrackedFiles().keySet());

filePool.addAll(HEAD_COMMIT.getTrackedFiles().keySet());

filePool.addAll(OTHER_COMMIT.getTrackedFiles().keySet());

AtomicBoolean isConflict = new AtomicBoolean(false);

filePool.forEach(fileName -> {

final String SPLIT = SPLIT_COMMIT.getTrackedFiles().get(fileName);

final String HEAD = HEAD_COMMIT.getTrackedFiles().get(fileName);

final String OTHER = OTHER_COMMIT.getTrackedFiles().get(fileName);

if (SPLIT != null && OTHER != null && !SPLIT.equals(OTHER) && SPLIT.equals(HEAD)) {

String contents = readContentsAsString(blobStore.get(OTHER));

workingArea.saveFile(contents, fileName);

stagingArea.stageForAddition(readContentsAsString(blobStore.get(OTHER)), fileName);

}

if (SPLIT != null && HEAD != null && !SPLIT.equals(HEAD) && SPLIT.equals(OTHER)) {

workingArea.saveFile(readContentsAsString(blobStore.get(HEAD)), fileName);

}

if (

!Objects.equals(SPLIT, HEAD) && !Objects.equals(SPLIT, OTHER) && !Objects.equals(HEAD, OTHER)

) {

/* conflict */

String headContents = (HEAD != null ? readContentsAsString(blobStore.get(HEAD)) : "");

String otherContents = (OTHER != null ? readContentsAsString(blobStore.get(OTHER)) : "");

String contents = "<<<<<<< HEAD\n" +

headContents +

"=======\n" +

otherContents +

">>>>>>>\n";

workingArea.saveFile(contents, fileName);

stagingArea.stageForAddition(contents, fileName);

isConflict.set(true);

}

if (SPLIT == null && OTHER == null && HEAD != null) {

workingArea.saveFile(readContentsAsString(blobStore.get(HEAD)), fileName);

}

if (SPLIT == null && HEAD == null && OTHER != null) {

String contents = readContentsAsString(blobStore.get(OTHER));

workingArea.saveFile(contents, fileName);

stagingArea.stageForAddition(readContentsAsString(blobStore.get(OTHER)), fileName);

}

if (SPLIT != null && SPLIT.equals(HEAD) && OTHER == null) {

stagingArea.stageForRemoval(workingArea.getFile(fileName));

workingArea.deleteFile(fileName);

}

if (SPLIT != null && SPLIT.equals(OTHER) && HEAD == null) {

/* leave the file removed */

}

});

String commitMessage = String.format(

"Merged %s into %s.",

targetBranch.getName(),

currentBranch.getName());

commit(commitMessage, OTHER_COMMIT.getHash());

if (isConflict.get()) {

System.out.println("Encountered a merge conflict.");

}

/**

* Saves the given login information under the given remote name.

* If a remote with the given name already exists, print `A remote with that name already exists.`

public void addRemote(String name, String URI) throws IOException {

remoteStore.addRemote(name, URI);

}

/**

* Remove information associated with the given remote name.

* If a remote with the given name does not exist, print `A remote with that name does not exist.`

public void rmRemote(String name) {

remoteStore.removeRemote(name);

}

/**

* finds the latest common ancestor of two branches in linear time relative to the size of the commit tree

private Commit splitPoint(Branch a, Branch b) {

Commit A = commitStore.getCommitByHash(a.getCommitHash());

Commit B = commitStore.getCommitByHash(b.getCommitHash());

Set<String> set = getCommitTree(A).stream().map(Commit::getHash).collect(Collectors.toSet());

return getCommitTree(B).stream()

.filter(commit -> set.contains(commit.getHash()))

.max(Comparator.comparing(Commit::getTimestamp))

.orElse(null);

}

private Commit getCurrentCommit() {

String commitHash = getCurrentBranch().getCommitHash();

return commitStore.getCommitByHash(commitHash);

}

private List<Commit> getCommitChain(Commit startingCommit) {

List<Commit> commits = new ArrayList<>();

Commit currentCommit = startingCommit;

while (currentCommit != null) {

commits.add(currentCommit);

currentCommit = commitStore.getCommitByHash(currentCommit.getParent());

}

return commits;

}

private List<Commit> getCommitTree(Commit rootCommit) {

List<Commit> result = new ArrayList<>();

DFS(rootCommit, new HashSet<>(), result);

return result;

}

private void DFS(Commit node, Set<String> visited, List<Commit> list) {

list.add(node);

visited.add(node.getHash());

String primaryParent = node.getParent();

String secondaryParent = node.getSecondaryParent();

if (primaryParent != null && !visited.contains(primaryParent)) {

DFS(commitStore.getCommitByHash(primaryParent), visited, list);

}

if (secondaryParent != null && !visited.contains(secondaryParent)) {

DFS(commitStore.getCommitByHash(secondaryParent), visited, list);

}

private Branch getCurrentBranch() {

return branchStore.getBranch(head.get());

}

private void setCurrentBranch(Branch branch) {

head.set(branch);

}

private void checkInitializedGitletDirectory() {

if (!GITLET_DIR.exists()) {

exitWithMessage("Not in an initialized Gitlet directory.");

}

gitlet/gitlet/gitlet/Repository.java at master · xUser5000/gitlet · GitHub

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