File Explorer

1const jsDiff = require('diff')2 3const shouldPrintPatch = require('./should-print-patch.js')4 5const colors = {6  // red7  removed: { open: '\x1B[31m', close: '\x1B[39m' },8  // green9  added: { open: '\x1B[32m', close: '\x1B[39m' },10  // blue11  header: { open: '\x1B[34m', close: '\x1B[39m' },12  // cyan13  section: { open: '\x1B[36m', close: '\x1B[39m' },14}15 16const color = (colorStr, colorId) => {17  const { open, close } = colors[colorId]18  // avoid highlighting the "\n" (would highlight till the end of the line)19  return colorStr.replace(/[^\n\r]+/g, open + '$&' + close)20}21 22const formatDiff = async ({ files, opts = {}, refs, versions }) => {23  let res = ''24  const srcPrefix = opts.diffNoPrefix ? '' : opts.diffSrcPrefix || 'a/'25  const dstPrefix = opts.diffNoPrefix ? '' : opts.diffDstPrefix || 'b/'26 27  for (const filename of files.values()) {28    const names = {29      a: `${srcPrefix}${filename}`,30      b: `${dstPrefix}${filename}`,31    }32 33    let fileMode = ''34    const filenames = {35      a: refs.get(`a/${filename}`),36      b: refs.get(`b/${filename}`),37    }38    const contents = {39      a: filenames.a && filenames.a.content,40      b: filenames.b && filenames.b.content,41    }42    const modes = {43      a: filenames.a && filenames.a.mode,44      b: filenames.b && filenames.b.mode,45    }46 47    if (contents.a === contents.b && modes.a === modes.b) {48      continue49    }50 51    if (opts.diffNameOnly) {52      res += `${filename}\n`53      continue54    }55 56    let patch = ''57    let headerLength = 058    const header = str => {59      headerLength++60      patch += `${str}\n`61    }62 63    // manually build a git diff-compatible header64    header(`diff --git ${names.a} ${names.b}`)65    if (modes.a === modes.b) {66      fileMode = filenames.a.mode67    } else {68      if (modes.a && !modes.b) {69        header(`deleted file mode ${modes.a}`)70      } else if (!modes.a && modes.b) {71        header(`new file mode ${modes.b}`)72      } else {73        header(`old mode ${modes.a}`)74        header(`new mode ${modes.b}`)75      }76    }77    /* eslint-disable-next-line max-len */78    header(`index ${opts.tagVersionPrefix || 'v'}${versions.a}..${opts.tagVersionPrefix || 'v'}${versions.b} ${fileMode}`)79 80    if (await shouldPrintPatch(filename)) {81      patch += jsDiff.createTwoFilesPatch(82        names.a,83        names.b,84        contents.a || '',85        contents.b || '',86        '',87        '',88        {89          context: opts.diffUnified === 0 ? 0 : opts.diffUnified || 3,90          ignoreWhitespace: opts.diffIgnoreAllSpace,91        }92      ).replace(93        '===================================================================\n',94        ''95      ).replace(/\t\n/g, '\n') // strip trailing tabs96      headerLength += 297    } else {98      header(`--- ${names.a}`)99      header(`+++ ${names.b}`)100    }101 102    if (opts.color) {103      // this RegExp will include all the `\n` chars into the lines, easier to join104      const lines = patch.split(/^/m)105      res += color(lines.slice(0, headerLength).join(''), 'header')106      res += lines.slice(headerLength).join('')107        .replace(/^-.*/gm, color('$&', 'removed'))108        .replace(/^\+.*/gm, color('$&', 'added'))109        .replace(/^@@.+@@/gm, color('$&', 'section'))110    } else {111      res += patch112    }113  }114 115  return res.trim()116}117 118module.exports = formatDiff119