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feat!: use "concordance" package to display diff instead of using cus…
…tom diff (#2828)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,96 +1 @@ | ||
| import * as diff from 'diff' | ||
|
|
||
| export interface DiffOptions { | ||
| outputTruncateLength?: number | ||
| outputDiffLines?: number | ||
| showLegend?: boolean | ||
| } | ||
|
|
||
| function formatLine(line: string, maxWidth: number) { | ||
| return line.slice(0, maxWidth) + (line.length > maxWidth ? '…' : '') | ||
| } | ||
|
|
||
| export function unifiedDiff(actual: string, expected: string, options: DiffOptions = {}) { | ||
| if (actual === expected) | ||
| return '' | ||
|
|
||
| const { outputTruncateLength = 80, outputDiffLines, showLegend = true } = options | ||
|
|
||
| const indent = ' ' | ||
| const diffLimit = outputDiffLines || 15 | ||
|
|
||
| const counts = { | ||
| '+': 0, | ||
| '-': 0, | ||
| } | ||
| let previousState: '-' | '+' | null = null | ||
| let previousCount = 0 | ||
| function preprocess(line: string) { | ||
| if (!line || line.match(/\\ No newline/)) | ||
| return | ||
|
|
||
| const char = line[0] as '+' | '-' | ||
| if ('-+'.includes(char)) { | ||
| if (previousState !== char) { | ||
| previousState = char | ||
| previousCount = 0 | ||
| } | ||
| previousCount++ | ||
| counts[char]++ | ||
| if (previousCount === diffLimit) | ||
| return `${char} ...` | ||
| else if (previousCount > diffLimit) | ||
| return | ||
| } | ||
| return line | ||
| } | ||
|
|
||
| const msg = diff.createPatch('string', expected, actual) | ||
| const lines = msg.split('\n').slice(5).map(preprocess).filter(Boolean) as string[] | ||
| const isCompact = counts['+'] === 1 && counts['-'] === 1 && lines.length === 2 | ||
|
|
||
| let formatted = lines.map((line: string) => { | ||
| line = line.replace(/\\"/g, '"') | ||
| if (line[0] === '-') { | ||
| line = formatLine(line.slice(1), outputTruncateLength) | ||
| if (isCompact) | ||
| return line | ||
| return `- ${formatLine(line, outputTruncateLength)}` | ||
| } | ||
| if (line[0] === '+') { | ||
| line = formatLine(line.slice(1), outputTruncateLength) | ||
| if (isCompact) | ||
| return line | ||
| return `+ ${formatLine(line, outputTruncateLength)}` | ||
| } | ||
| if (line.match(/@@/)) | ||
| return '--' | ||
| return ` ${line}` | ||
| }) | ||
|
|
||
| if (showLegend) { | ||
| // Compact mode | ||
| if (isCompact) { | ||
| formatted = [ | ||
| `- Expected ${formatted[0]}`, | ||
| `+ Received ${formatted[1]}`, | ||
| ] | ||
| } | ||
| else { | ||
| if (formatted[0].includes('"')) | ||
| formatted[0] = formatted[0].replace('"', '') | ||
|
|
||
| const last = formatted.length - 1 | ||
| if (formatted[last].endsWith('"')) | ||
| formatted[last] = formatted[last].slice(0, formatted[last].length - 1) | ||
|
|
||
| formatted.unshift( | ||
| `- Expected - ${counts['-']}`, | ||
| `+ Received + ${counts['+']}`, | ||
| '', | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| return formatted.map(i => indent + i).join('\n') | ||
| } | ||
| export { unifiedDiff } from '@vitest/utils/diff' |
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