git-diffs.js

const {spawnSync, getVariants} = require('./utils')

const variants = getVariants()

const [, , end, start = 'exercise'] = process.argv

function getVariant(variant, requested) {
  if (variant[requested]) return variant[requested]
  return variant.extras.find(e => e.number === Number(requested))
}

function getFilesForVariant() {
  return Object.values(variants)
    .map(variant => {
      const before = getVariant(variant, start)
      const after = getVariant(variant, end)
      return {
        before: before ? before.file : null,
        after: after ? after.file : null,
      }
    })
    .filter(({before, after}) => before && after)
}

const files = getFilesForVariant()
const commands = files.map(
  ({before, after}) =>
    `diff -u "${before}" "${after}" | delta --theme="night-owlish" --paging=never`,
)

console.log(commands.join('\n'), '\n\n')

for (const cmd of commands) {
  spawnSync(cmd, {stdio: 'inherit'})
}