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Directory :  /usr/local/lib/node_modules/npm/node_modules/libnpmdiff/lib/

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Current File : /usr/local/lib/node_modules/npm/node_modules/libnpmdiff/lib/format-diff.js
const EOL = '\n'

const colorizeDiff = require('@npmcli/disparity-colors')
const jsDiff = require('diff')

const shouldPrintPatch = require('./should-print-patch.js')

const formatDiff = ({ files, opts = {}, refs, versions }) => {
  let res = ''
  const srcPrefix = opts.diffNoPrefix ? '' : opts.diffSrcPrefix || 'a/'
  const dstPrefix = opts.diffNoPrefix ? '' : opts.diffDstPrefix || 'b/'

  for (const filename of files.values()) {
    const names = {
      a: `${srcPrefix}${filename}`,
      b: `${dstPrefix}${filename}`,
    }

    let fileMode = ''
    const filenames = {
      a: refs.get(`a/${filename}`),
      b: refs.get(`b/${filename}`),
    }
    const contents = {
      a: filenames.a && filenames.a.content,
      b: filenames.b && filenames.b.content,
    }
    const modes = {
      a: filenames.a && filenames.a.mode,
      b: filenames.b && filenames.b.mode,
    }

    if (contents.a === contents.b && modes.a === modes.b)
      continue

    if (opts.diffNameOnly) {
      res += `${filename}${EOL}`
      continue
    }

    let patch = ''
    let headerLength = 0
    const header = str => {
      headerLength++
      patch += `${str}${EOL}`
    }

    // manually build a git diff-compatible header
    header(`diff --git ${names.a} ${names.b}`)
    if (modes.a === modes.b)
      fileMode = filenames.a.mode
    else {
      if (modes.a && !modes.b)
        header(`deleted file mode ${modes.a}`)
      else if (!modes.a && modes.b)
        header(`new file mode ${modes.b}`)
      else {
        header(`old mode ${modes.a}`)
        header(`new mode ${modes.b}`)
      }
    }
    header(`index ${opts.tagVersionPrefix || 'v'}${versions.a}..${opts.tagVersionPrefix || 'v'}${versions.b} ${fileMode}`)

    if (shouldPrintPatch(filename)) {
      patch += jsDiff.createTwoFilesPatch(
        names.a,
        names.b,
        contents.a || '',
        contents.b || '',
        '',
        '',
        {
          context: opts.diffUnified === 0 ? 0 : opts.diffUnified || 3,
          ignoreWhitespace: opts.diffIgnoreAllSpace,
        }
      ).replace(
        '===================================================================\n',
        ''
      ).replace(/\t\n/g, '\n') // strip trailing tabs
      headerLength += 2
    } else {
      header(`--- ${names.a}`)
      header(`+++ ${names.b}`)
    }

    res += (opts.color
      ? colorizeDiff(patch, { headerLength })
      : patch)
  }

  return res.trim()
}

module.exports = formatDiff

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