quasar

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const path = require('node:path')
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const fse = require('fs-extra')
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const { sync: fastGlob, convertPathToPattern } = require('fast-glob')
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const { createPatch } = require('diff')
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const { highlight } = require('cli-highlight')
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const rootFolder = path.resolve(__dirname, '..')
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function resolve (_path) {
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  return path.resolve(rootFolder, _path)
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}
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function relative (_path) {
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  return path.relative(rootFolder, _path)
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}
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/**
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 * Call this with the path to file (or folder) you want to track, before the file gets updated.
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 * It will save the current contents and will print the diff before exiting the process.
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 *
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 * @param {string} locationPath
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 */
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module.exports = function prepareDiff (locationPath) {
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  const absolutePath = resolve(locationPath)
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  // If there is no "old" file/folder, then there is no diff (everything will be new)
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  if (!fse.existsSync(absolutePath)) {
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    return
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  }
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  let pattern = convertPathToPattern(absolutePath)
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  // If it's a directory, then query all files in it
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  if (fse.lstatSync(absolutePath).isDirectory()) {
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    pattern += '/*'
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  }
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  const originalsMap = new Map()
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  const originalFiles = fastGlob(pattern)
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  // If no files, then there is no diff (everything will be new)
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  if (originalFiles.length === 0) {
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    return
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  }
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  // Read the current (old) contents
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  originalFiles.forEach(filePath => {
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    originalsMap.set(filePath, fse.readFileSync(filePath, 'utf-8'))
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  })
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  // Before exiting the process, read the new contents and output the diff
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  process.on('exit', code => {
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    if (code !== 0) return
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    const currentFiles = fastGlob(pattern)
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    const currentMap = new Map()
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    let somethingChanged = false
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    currentFiles.forEach(filePath => {
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      const relativePath = relative(filePath)
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      currentMap.set(filePath, true)
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      if (originalsMap.has(filePath) === false) {
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        console.log(`\n 📜 New file: ${ relativePath }`)
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        somethingChanged = true
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        return
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      }
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      const currentContent = fse.readFileSync(filePath, 'utf-8')
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      const originalContent = originalsMap.get(filePath)
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      if (originalContent !== currentContent) {
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        const diffPatch = createPatch(filePath, originalContent, currentContent)
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        console.log(`\n 📜 Changes for ${ relativePath }\n`)
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        console.log(highlight(diffPatch, { language: 'diff' }))
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        somethingChanged = true
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      }
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    })
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    originalsMap.forEach((_, filePath) => {
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      if (currentMap.has(filePath) === false) {
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        console.log(`\n 📜 Removed file: ${ relative(filePath) }\n`)
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        somethingChanged = true
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      }
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    })
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    if (somethingChanged === false) {
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      console.log('\n 📜 No changes detected.\n')
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    }
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  })
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}
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