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pix.js
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pix.js
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const fs=require('fs');
const path=require('path');
const crypto = require('crypto');
const zlib = require('zlib');
const sharp = require('sharp');
const {history} = require('./commits.js');
function init() {
const default_branch="main";
if (fs.existsSync('.pix')) {
console.log('pixitory already initialized!');
return;
}
fs.mkdirSync('.pix');
const pixPath=process.cwd()+'/.pix';
const structure = [
{ dir: '', files: [{ name: 'HEAD', content: `ref: refs/heads/${default_branch}\n` }] },
{ dir: 'branches', files: [] },
{ dir: 'objects', files: [] },
{ dir: 'refs/heads', files: [] },
{ dir: 'refs/tags', files: [] }
];
structure.forEach(({dir, files}) => {
const fullPath = path.join(pixPath, dir);
fs.mkdirSync(fullPath, {recursive: true});
files.forEach(({name, content}) => {
fs.writeFileSync(path.join(fullPath, name), content);
});
});
fs.writeFileSync(path.join(pixPath, 'config'), '[core]\n\trepositoryformatversion = 0\n\tbare = false\n');
fs.writeFileSync(path.join(pixPath, 'index'), '');
console.log('Initialized empty pixitory at', pixPath);
}
function computeHash(filename) {
const fileBuffer = fs.readFileSync(filename);
return crypto.createHash('sha1').update(fileBuffer).digest('hex');
}
function stage(filename) {
const pixPath=process.cwd()+'/.pix';
const indexPath = path.join(pixPath, 'index.json');
if (!fs.existsSync(pixPath)) {
fs.mkdirSync(pixPath);
console.log("Initialized empty .pix repository")
}
let index = {};
if (fs.existsSync(indexPath)) {
index = JSON.parse(fs.readFileSync(indexPath, 'utf8'));
} else {
index = { files: {} };
}
const fileHash = computeHash(filename);
const timestamp = new Date().toISOString();
index.files[filename] = {
path: path.resolve(filename),
status: 'staged',
hash: fileHash,
timestamp: timestamp
};
fs.writeFileSync(indexPath, JSON.stringify(index, null, 2), 'utf8');
}
function add(filename) {
stage(filename);
}
function processMetadata(filename) {
sharp(filename)
.metadata()
.then(metadata => {
const EXIFdata = JSON.stringify(metadata);
zlib.deflate(EXIFdata, (err, compressed) => {
if (err) {
console.error('Error compressing metadata:', err);
return;
}
const hash = crypto.createHash('sha1').update(compressed).digest('hex');
console.log("Generated Hash:", hash);
const objectDir = path.join(".pix/objects", hash.substring(0, 2));
const objectFile = path.join(objectDir, hash.substring(2));
if (!fs.existsSync(objectDir)) {
fs.mkdirSync(objectDir, { recursive: true });
}
fs.writeFileSync(objectFile, compressed);
console.log(`Metadata stored at ${objectFile}`);
});
})
.catch(err => {
console.error('Error extracting metadata:', err);
});
}
function commit(message) {
const pixPath = path.join(process.cwd(), '.pix');
const indexPath = path.join(pixPath, 'index.json');
if (!fs.existsSync(indexPath)) {
console.log('No files staged for commit.');
return;
}
// Read the index.json file
let index = JSON.parse(fs.readFileSync(indexPath, 'utf8'));
const files = index.files;
if (Object.keys(files).length === 0) {
console.log('No files staged for commit.');
return;
}
// Create the objects directory if it does not exist
const objectsDir = path.join(pixPath, 'objects');
if (!fs.existsSync(objectsDir)) {
fs.mkdirSync(objectsDir, { recursive: true });
}
// Process each staged file
for (const [filename, fileData] of Object.entries(files)) {
const srcDir = fileData.path;
const destDir = path.join(objectsDir, path.basename(filename));
// Copy file to .pix/objects
fs.copyFileSync(srcDir, destDir);
console.log(`${filename} successfully added to .pix/objects/`);
// Process metadata
processMetadata(srcDir);
}
// Clear the index.json file
fs.writeFileSync(indexPath, JSON.stringify({ files: {} }, null, 2), 'utf8');
console.log('index.json cleared after commit.');
// Add a commit to history
history.addCommit(message);
history.printHistory();
}
function branch(branch) {
const headPath = path.join('.pix', 'HEAD');
const currentBranch = fs.readFileSync(headPath, 'utf8').trim();
const currentBranchPath = path.join('.pix', 'refs', 'heads', currentBranch);
const commitHash = fs.readFileSync(currentBranchPath, 'utf8').trim();
const newBranchPath = path.join('.pix', 'refs', 'heads', branch);
fs.writeFileSync(newBranchPath, commitHash);
console.log(`Branch '${branch}' created from '${currentBranch}' at commit ${commitHash}`);
}
function checkout(branch) {
const branchPath = path.join('.pix', 'refs', 'heads', branch);
if (!fs.existsSync(branchPath)) {
console.log(`Branch '${branch}' does not exist.`);
return;
}
const headPath = path.join('.pix', 'HEAD');
fs.writeFileSync(headPath, branch);
console.log(`Switched to branch '${branch}'`);
}
function retrieve(hash) {
}
module.exports = { init, add, commit, branch, checkout, retrieve };