comment-value/src/update.js

const fs = require('fs')
const path = require('path')
const la = require('lazy-ass')
const is = require('check-more-types')
const debug = require('debug')('comment-value')

function updateFile (filename) {
  debug('updating comment values in file %s', filename)
  la(is.unemptyString(filename), 'missing filename', filename)

  const source = fs.readFileSync(filename, 'utf8')
  const results = require(path.join(process.cwd(), 'results.json'))

  const forThisFile = comment => comment.filename === filename

  const lines = source.split('\n')
  results.comments
    .filter(forThisFile)
    .forEach(updateComment)

  function updateComment (c) {
    const commentStart = '//>'
    // console.log('updating comment')
    // console.log(c)
    // line starts with 1
    la(c.from.line === c.to.line, 'line mismatch', c)
    const line = lines[c.from.line - 1]
    la(line, 'missing line', c.from.line - 1, 'for comment', c)
    // console.log('updating line', line, 'with value', c.value)
    const k = line.indexOf(commentStart)
    la(k >= 0, 'line does not have comment', k, 'for comment', c)
    const updatedLine = line.substr(0, k) + commentStart + ' ' + c.value
    lines[c.from.line - 1] = updatedLine
  }

  const updatedSource = lines.join('\n')
  // console.log('updated source')
  // console.log(updatedSource)
  fs.writeFileSync(filename, updatedSource, 'utf8')
}

module.exports = updateFile

if (!module.exports) {
  const sourceFilename = path.join(process.cwd(), process.argv[2])
  updateFile(sourceFilename)
}