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'use strict'
const childProcess = require('child_process')
const fs = require('fs')
const os = require('os')
const path = require('path')
let SourceCodeFixer = null
try {
SourceCodeFixer = require('eslint/lib/linter/source-code-fixer')
} catch (e) {
SourceCodeFixer = require('eslint/lib/util/source-code-fixer')
}
const getRuleURI = require('eslint-rule-documentation')
module.exports = function (results) {
let output = '\n'
let errors = 0
let warnings = 0
const rootPath = process.cwd()
for (const result of results) {
const messages = result.messages
if (messages.length === 0) {
continue
}
errors += result.errorCount
warnings += result.warningCount
const relativePath = path.relative(rootPath, result.filePath)
output += `${relativePath}\n`
for (const message of messages) {
output += `${message.line}:${message.column} ${message.ruleId || ''}`
if (message.ruleId) {
const ruleURI = getRuleURI(message.ruleId)
if (ruleURI.found) {
output += ` (${ruleURI.url})`
}
}
output += `\n\t${message.message}\n`
}
if (messages.some(msg => msg.fix)) {
const fixResult = SourceCodeFixer.applyFixes(result.source, messages)
output += `\n\n$ eslint --fix ${relativePath}\n`
output += diff(result.source, fixResult.output)
}
output += '\n\n'
}
const total = errors + warnings
if (total > 0) {
output += [
'\u2716 ',
total,
pluralize(' problem', total),
' (',
errors,
pluralize(' error', errors),
', ',
warnings,
pluralize(' warning', warnings),
')\n',
].join('')
}
return total > 0 ? output : ''
}
function pluralize(word, count) {
return count === 1 ? word : `${word}s`
}
function diff(a, b) {
const aPath = path.join(os.tmpdir(), 'a.js')
const bPath = path.join(os.tmpdir(), 'p.js')
fs.writeFileSync(aPath, a, {encoding: 'utf8'})
fs.writeFileSync(bPath, b, {encoding: 'utf8'})
const result = childProcess.spawnSync('diff', ['-U5', aPath, bPath], {encoding: 'utf8'})
return result.stdout.split('\n').slice(2).join('\n')
}