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log.js
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log.js
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import k from 'kleur'
const { cyan, grey, red, green, bold } = k
let stdout = process.stdout
export function silence() {
// @ts-expect-error
stdout = { write() {} }
}
/**
*
* @param {...any} args
*/
function writeLine(...args) {
stdout.write(args.join(' ') + '\n')
}
/**
* @param {string} str
* @returns
*/
function decapitalize(str) {
return str && str[0].toLowerCase() + str.slice(1)
}
/**
*
* @template T
* @param {string} str
* @param {() => T | Promise<T>} task
* @returns {Promise<T>}
*/
async function timedStep(str, task) {
stdout.write(cyan(`• `) + str + '...')
const start = Date.now()
block()
const done = () => {
stdout.write(cyan(' ' + timeSince(start) + '\n'))
release()
}
try {
return await Promise.resolve(task()).then((result) => {
done()
return result
})
} catch (/** @type {any} */ error) {
return log.fail('Unexpected error', { error })
}
}
/**
*
* @template T
* @param {string} str
* @param {() => T | Promise<T>} task
* @returns {Promise<T>}
*/
async function timedSubstep(str, task) {
stdout.write(grey(' ' + str + '...'))
const start = Date.now()
block()
const done = () => {
stdout.write(cyan(' ' + timeSince(start) + '\n'))
release()
}
try {
return await Promise.resolve(task()).then((result) => {
done()
return result
})
} catch (/** @type {any} */ error) {
return log.fail('Unexpected error', { error })
}
}
/**
* @type {(() => void)[]}
*/
const logQueue = []
let isBlocked = false
function block() {
isBlocked = true
}
function release() {
isBlocked = false
while (logQueue.length) {
logQueue.shift()?.()
}
}
/**
* @template {any[]} Args
* @param {(...args: Args) => void} f
* @returns {(...args: Args) => void}
*/
function queueify(f) {
return (...args) => {
if (isBlocked) {
logQueue.push(() => f(...args))
} else {
f(...args)
}
}
}
export const log = {
/**
* @param {string} headline
* @param {{ error?: Error, detail?: string }} [more]
* @returns {never}
*/
fail(headline, more) {
console.error('\n\n' + red().bold('∙ ERROR ∙'), red(headline))
more?.detail && console.error('\n' + more.detail)
more?.error && console.error('\n', more.error)
process.exit(1)
},
/**
* @param {string} str
*/
task: (str) => writeLine(green('\n::'), bold(str), green('::\n')),
/**
* @param {string} str
*/
step: (str) => writeLine(cyan(`•`), str),
substep: queueify((str) => writeLine(grey(' ' + str))),
/**
* @param {string} str
*/
success: (str) => writeLine('\n' + green(`✔`), bold(str)),
/**
* @param {string} str
*/
info: (str) => writeLine('💡', str),
timedStep,
timedSubstep,
/**
* @param {string} str
*/
timedTask: (str) => {
log.task(str)
const start = Date.now()
return (msg = `Finished ${decapitalize(str)}`) => {
log.success(`${msg} in ${timeSince(start)}`)
}
},
log: writeLine,
}
/**
* @param {number} start
* @returns {string}
*/
export const timeSince = (start) => `${((Date.now() - start) / 1000).toFixed(2)}s`