Standardizes stuff with leading or trailing dots.

standardize-dots.js

const fs = require('fs');
const program = require('commander');

function makeTrailingDots(gremlin) {
  const lines = gremlin
    .split('\n')
    .filter(line => line.length);

  const lastLineIndex = lines.length - 1;

  return lines
    .map((line, index, allLines) => {
      let cleanLine = line.trim();

      if (cleanLine.startsWith('.')) {
        cleanLine = cleanLine.substring(1);
      }

      if (cleanLine.endsWith('.')) {
        return cleanLine;
      }

      if (index < lastLineIndex && allLines[index + 1].trim().startsWith('.')) {
        cleanLine += '.';

      }

      return cleanLine;
    }).join('\n');
}

function makeLeadingDots(gremlin) {
  const lines = gremlin.split('\n');
  // console.log(lines.length);
  // console.log();

  return lines
    .filter(line => line.trim().length)
    .reverse()
    .map((line, index, allLines) => {
      let cleanLine = line;

      if (cleanLine.endsWith('.')) {
        cleanLine = cleanLine.substring(0, cleanLine.length - 1);
      }

      if (cleanLine.startsWith('.')) {
        return cleanLine;
      }

      if ((index < allLines.length - 1) && allLines[index + 1].endsWith('.')) {
        cleanLine = `.${cleanLine}`;
      }

      return cleanLine;
    }).reverse().join('\n');
}

program
  .option('-d, --dots [dots]', 'trailing or leading dots', /^(t|trailing|l|leading)$/i, 'trailing')
  .parse(process.argv);

const dotAdjustmentFunction = (program.dots.startsWith('l')) ? makeLeadingDots : makeTrailingDots;
const contents = fs.readFileSync(0, 'utf-8');

const finalGremlin = dotAdjustmentFunction(contents);

console.log(finalGremlin);