build-archive

#!/usr/bin/env node

const fs = require('fs');
const path = require('path');

const processCommandLine = () => {
  const usage = () => {
    console.log('usage: build-archive <path to snapshot directory>');
    process.exit(1);
  };

  const error = msg => {
    console.error(msg);
    process.exit(1);
  };

  const args = {
    snapshotPath: process.argv[2],
    outputFile: 'archive.js'
  };

  if (!args.snapshotPath) {
    return usage();
  }

  try {
    fs.statSync(args.snapshotPath);
  } catch (err) {
    return error('snapshot directory not found');
  }

  return args;
};

const processSnapshotFile = (snapshotPath, file) => {
  const snapshot = JSON.parse(fs.readFileSync(path.join(snapshotPath, file)));
  const parts = file.match(/-(\d{2})(\d{2})(\d{2})\.json$/);

  return {
    grid: snapshot.grid.cells,
    time: [parts[1], parts[2]].join(':')
  };
};

const getTeamsFromSnapshotFile = (snapshotPath, file) => {
  const snapshot = JSON.parse(fs.readFileSync(path.join(snapshotPath, file)));

  return snapshot.teams.map(team => {
    return {
      name: team.name,
      role: team.role,
      colour: team.colour,
      gravatar: team.gravatar
    };
  });
};

const createArchive = args => {
  const isSnapshotFile = name => name.match(/-\d{6}\.json$/);
  const snapshotFileNames = fs.readdirSync(args.snapshotPath).filter(isSnapshotFile);

  const teams = getTeamsFromSnapshotFile(args.snapshotPath, snapshotFileNames[snapshotFileNames.length - 1]);
  const snapshots = snapshotFileNames.map(processSnapshotFile.bind(null, args.snapshotPath));

  return {
    teamCount: teams.length,
    snapshotCount: snapshots.length,
    teams: JSON.stringify(teams),
    snapshots: JSON.stringify(snapshots)
  };
};

const writeArchiveFile = (filename, archive) => {
  const data = `var teams = ${archive.teams}; var snapshots = ${archive.snapshots};`;
  fs.writeFileSync(`${__dirname}/${filename}`, data);
  return data.length;
};

const args = processCommandLine();
const archive = createArchive(args);
const written = writeArchiveFile(args.outputFile, archive);

console.log(`file: ${args.outputFile}, size: ${Math.round(written/1024)} KiB`);
console.log(`snapshots: ${archive.snapshotCount}, teams: ${archive.teamCount}`);