refactor: refactor rules to put each rule into directory of their category

[straker]

Just bringing some organization to the lib/rules directory that we've talked about before. Each rule is now put into a directory for the rules category, similar to how each check is in a directory for the category. Matches files are placed as a sibling to the rule that uses it, unless multiple rules from different categories make use of it in which case it goes into the generic dir (similar to the checks generic dir).

Used the following script to do 99% of the work, and manually fixed a a few instances of matches depending on another matches file.

const { promises: fs } = require('fs');
const path = require('path');
const { glob } = require('glob');
const util = require('util');
const exec = util.promisify(require('child_process').exec);

const matchesFiles = {};

(async () => {
  const rulesDir = './lib/rules';
  const files = await glob(path.join(rulesDir, '*.json'), { dotRelative: true });
  for (const file of files) {
    const rule = require(file);

    const matches = rule.matches;
    const cat = rule.tags.find(tag => tag.startsWith('cat.'));
    const catDir = cat.split('.')[1];

    const filename = path.basename(file);

    try {
      await exec(`mkdir ${path.join(rulesDir, catDir)}`);
    } catch (err) {}
    await exec(`git mv ${path.join(rulesDir, filename)} ${path.join(rulesDir, catDir, filename)}`);

    if (matches) {
      matchesFiles[matches + '.js'] = matchesFiles[matches + '.js'] ?? [];
      matchesFiles[matches + '.js'].push(catDir);
    }
  }

  for (matchFile in matchesFiles) {
    const matches = matchesFiles[matchFile];
    let catDir;

    if (matches.every(catDir => catDir === matches[0])) {
      catDir = matches[0];
    }
    else {
      catDir = 'generic';
      try {
        await exec(`mkdir ${path.join(rulesDir, catDir)}`);
      } catch (err) {}
    }

    const filePath = path.join(rulesDir, matchFile);
    let file = await fs.readFile(filePath, 'utf8');
    file = file.replaceAll(/ '\.\.\//g, " '../../");
    await fs.writeFile(filePath, file, 'utf8');

    await exec(`git mv ${path.join(rulesDir, matchFile)} ${path.join(rulesDir, catDir, matchFile)}`);
  }
})();

[dbjorge]

Thanks for including the script you used to generate the change, it was helpful for reviewing!

The changes that are here look fine, but I think there are a few minor omissions:

• There are a few orphaned files left in /lib/rules that appear to be dead code; they can probably be removed
• There are a few links to files within the rules directory in some of the developer documentation that should be updated (search for /rules/, there are cases in /doc/check-options.md and /doc/developer-guide.md)