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const jsDiff = require('diff') const shouldPrintPatch = require('./should-print-patch.js') const colors = { // red removed: { open: '\x1B[31m', close: '\x1B[39m' }, // green added: { open: '\x1B[32m', close: '\x1B[39m' }, // blue header: { open: '\x1B[34m', close: '\x1B[39m' }, // cyan section: { open: '\x1B[36m', close: '\x1B[39m' }, } const color = (colorStr, colorId) => { const { open, close } = colors[colorId] // avoid highlighting the "\n" (would highlight till the end of the line) return colorStr.replace(/[^\n\r]+/g, open + '$&' + close) } const formatDiff = ({ files, opts = {}, refs, versions }) => { let res = '' const srcPrefix = opts.diffNoPrefix ? '' : opts.diffSrcPrefix || 'a/' const dstPrefix = opts.diffNoPrefix ? '' : opts.diffDstPrefix || 'b/' for (const filename of files.values()) { const names = { a: `${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}\n` continue } let patch = '' let headerLength = 0 const header = str => { headerLength++ patch += `${str}\n` } // 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}`) } } /* eslint-disable-next-line max-len */ 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(`+++ ${names.b}`) } if (opts.color) { // this RegExp will include all the `\n` chars into the lines, easier to join const lines = patch.split(/^/m) res += color(lines.slice(0, headerLength).join(''), 'header') res += lines.slice(headerLength).join('') .replace(/^-.*/gm, color('$&', 'removed')) .replace(/^\+.*/gm, color('$&', 'added')) .replace(/^@@.+@@/gm, color('$&', 'section')) } else { res += patch } } return res.trim() } module.exports = formatDiff