to free up disk space by deleting downloaded packages

workspace-clean

#!/usr/bin/env node
let fs = require('fs');
let path = require('path');
let util = require('util');

let target = {
  files: [
    'workspace.xml',
  ],
  dirs: [
    'node_modules',
    'elm-stuff',
    'platforms',
    'plugins',
    'www',
    'dist',
    '.cache',
    '.sourcemaps',
    'deps',
    '.erlang.mk',
  ],
};

function scanFile(filepath, filename) {
  if (target.files.some(f => f === filename)) {
    return fs.unlinkSync(filepath);
  }
}

let count = {
  file: 0,
  dir: 0,
  size: 0,
};

function formatSize(size) {
  let units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
  for (let i = 0; i < units.length; i++) {
    if (size < 1024) {
      return Math.round(size * 100) / 100 + units[i];
    }
    size /= 1024;
  }
}

let lastReport = 0;

function report() {
  let now = Date.now();
  if (now - lastReport > 1000) {
    lastReport = now;
    process.stderr.write(`\r  deleted: ${count.file} file | ${count.dir} dir | size: ${formatSize(count.size)}  `);
  }
}

function rmdir(dirpath, level = 0) {
  let files = fs.readdirSync(dirpath);
  files.forEach(filename => {
    let filepath = path.join(dirpath, filename);
    let stat = fs.lstatSync(filepath);
    if (stat.isFile()) {
      let size = stat.size;
      report();
      fs.unlinkSync(filepath);
      count.file++;
      count.size += size;
      report();
      return;
    }
    if (stat.isSymbolicLink()) {
      let size = stat.size;
      report();
      fs.unlinkSync(filepath);
      count.file++;
      count.size += size;
      report();
      return;
    }
    if (stat.isDirectory()) {
      rmdir(filepath, level + 1);
      return;
    }
    console.log('not file nor dir:', filepath, stat);
  });
  report();
  fs.rmdirSync(dirpath);
  count.dir++;
  report();
}

function scanDir(dirpath, dirname) {
  if (target.dirs.some(d => d === dirname)) {
    rmdir(dirpath);
    return;
  }
  let files = fs.readdirSync(dirpath);
  files.forEach(filename => {
    let filepath = path.join(dirpath, filename);
    let stat = fs.lstatSync(filepath);
    if (stat.isFile()) {
      return scanFile(filepath, filename);
    }
    if (stat.isDirectory()) {
      return scanDir(filepath, filename);
    }
  });
}

{
  let home = process.env.HOME;
  let dirname = 'workspace';
  let dirpath = path.join(home, dirname);
  scanDir(dirpath, dirname);
  process.stderr.write('\n');
  console.log('total freed', formatSize(count.size));
}