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Copy pathdiff.ts
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238 lines (209 loc) · 6.03 KB
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import { execSync, spawn } from 'child_process'
const Red = '\x1b[31m'
const Green = '\x1b[32m'
const Cyan = '\x1b[36m'
const Bold = '\x1b[1m'
const Underline = '\x1b[4m'
const Overline = '\x1b[53m' // \u203E
const Reset = '\x1b[0m'
export type DiffOptions = {
/* Include plus/minus signs in the diff output */
includePlusMinus: boolean
/* Include colors in the diff output */
includeColors: boolean
/* Include emojis next to file names to visually group them. */
includeEmoji: boolean
/* Include a line as a footer to close out the diff output */
includeFooter: boolean
/* Include untracked files in the diff output */
includeUntracked: boolean
/* Show staged changes */
cached: boolean
}
export type Diff = {
path: string
lineNumber: number
contents: string
}
function openInLess(content: string) {
const less = spawn('less', ['-R'], { stdio: ['pipe', process.stdout, process.stderr] })
less.stdin.write(content)
less.stdin.end()
}
// Set of animal emojis that will be mapped to files for easier identification
const ANIMALS = [
'🐶',
'🐱',
'🐭',
'🐹',
'🐰',
'🦊',
'🐻',
'🐼',
'🐨',
'🐯',
'🦁',
'🐮',
'🐷',
'🐸',
'🐵',
'🐔',
'🐧',
'🐦',
'🦆',
'🦉',
]
export function splitFilesInDiff(input: string): string[] {
const lines = input.split('\n')
const diffs: string[] = []
let currentDiff = ''
for (const line of lines) {
if (line.startsWith('diff --git')) {
if (currentDiff) {
diffs.push(currentDiff)
}
currentDiff = line
} else {
currentDiff += '\n' + line
}
}
if (currentDiff) {
diffs.push(currentDiff)
}
return diffs.filter((d) => d.trim() !== '')
}
function getLineNumber(line: string): number | null {
const lineNumberMatch = line.match(/@@ -(\d+),\d+ .* @@/)
return lineNumberMatch ? parseInt(lineNumberMatch[1]) : null
}
export function parseDiff(diffOutput: string): Diff[] {
if (diffOutput.trim() === '') {
return []
}
const fileParts = splitFilesInDiff(diffOutput)
const diffs: Diff[] = []
fileParts.forEach((part) => {
const lines = part.split('\n')
const filePath =
lines[0]
.split(' b/')
.pop()
?.trim()
.replace(/^"(.+)"$/, '$1') || ''
let currentSectionLineNumber: number | null = null
let currentSectionLines: string[] = []
const addDiff = () => {
if (currentSectionLineNumber !== null && currentSectionLines.length > 0) {
diffs.push({
path: filePath,
lineNumber: currentSectionLineNumber,
contents: currentSectionLines.join('\n'),
})
}
}
for (const line of lines) {
const lineNumber = getLineNumber(line)
if (lineNumber !== null) {
addDiff()
currentSectionLines = []
currentSectionLineNumber = lineNumber
} else {
currentSectionLines.push(line)
}
}
addDiff()
})
return diffs
}
function getHeader(diff: Diff, options: DiffOptions, index: number, includeEmoji: boolean): string {
return `${includeEmoji ? ANIMALS[index] + ' ' : ''}${diff.path}:${diff.lineNumber}`
}
function coloredDiff(diff: Diff, options: DiffOptions): string {
return diff.contents
.split('\n')
.map((line) => {
const color = line.startsWith('+') ? Green : line.startsWith('-') ? Red : ''
const text = !options.includePlusMinus ? line.slice(1) : line
return `${options.includeColors ? color : ''}${text}${options.includeColors ? Reset : ''}`
})
.join('\n')
}
function coloredHeader(header: string, options: DiffOptions): string {
return options.includeColors ? `${Bold}${Underline}${Cyan}${header}${Reset}` : header
}
function coloredFooter(footer: string, options: DiffOptions): string {
return options.includeColors ? `${Bold}${Overline}${Cyan}${footer}${Reset}` : footer
}
export function serializeDiffs(diffs: Diff[], options: DiffOptions): string {
if (diffs.length === 0) {
return ''
}
let fileIndex = 0
let lastFile = diffs[0].path
return diffs
.map((diff) => {
if (diff.path !== lastFile) {
lastFile = diff.path
fileIndex++
}
const header = getHeader(diff, options, fileIndex, options.includeEmoji)
const footer = options.includeFooter ? ' '.repeat(header.length) : ''
return `${coloredHeader(header, options)}\n${coloredDiff(diff, options)}\n${coloredFooter(
footer,
options,
)}`
})
.join('\n\n')
}
function getUntrackedFilesAsDiff(): string {
return execSync(
'git ls-files --others --exclude-standard -z | xargs -0 -n 1 git --no-pager diff --no-index /dev/null || true',
{
encoding: 'utf8',
},
)
}
function getDiffString(cached: boolean): string {
const command = cached ? 'git diff --cached' : 'git diff'
return execSync(command, { encoding: 'utf8' })
}
/**
* Get the current git diff as an array of diffs.
*
* @param includeUntracked [boolean] - Include untracked files in the diff output.
* @param cached [boolean] - Show staged changes.
* @returns [String] git diff string
*/
export function getDiffs(includeUntracked: boolean, cached: boolean): Diff[] {
let diffOutput = getDiffString(cached)
if (includeUntracked && !cached) {
const untrackedFiles = getUntrackedFilesAsDiff()
diffOutput += '\n\n'
diffOutput += untrackedFiles
}
return parseDiff(diffOutput)
}
/**
* Get the current git diff as a string.
*
* @param options [DiffOptions] - Options for the diff output.
* @returns [String] git diff string
*/
export function getDiff(options: DiffOptions): string {
const diffs = getDiffs(options.includeUntracked, options.cached)
return serializeDiffs(diffs, options)
}
/**
* Open the current git diff in less.
*
* @param options [DiffOptions] - Options for the diff output.
*/
export function showDiff(options: DiffOptions, useLess: boolean = true) {
const diffs = getDiffs(options.includeUntracked, options.cached)
const serialized = serializeDiffs(diffs, options)
if (useLess) {
openInLess(serialized)
} else {
console.log(serialized)
}
}