/
log.ts
133 lines (110 loc) · 3.81 KB
/
log.ts
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import chalk, { Chalk } from "chalk"
import _debug from "debug"
import WritableStream = NodeJS.WritableStream
let printer: ((message: string) => void) | null = null
export const debug = _debug("electron-builder")
export interface Fields {
[index: string]: any
}
export function setPrinter(value: ((message: string) => void) | null) {
printer = value
}
export type LogLevel = "info" | "warn" | "debug" | "notice" | "error"
export const PADDING = 2
export class Logger {
constructor(protected readonly stream: WritableStream) {
}
messageTransformer: ((message: string, level: LogLevel) => string) = it => it
filePath(file: string) {
const cwd = process.cwd()
return file.startsWith(cwd) ? file.substring(cwd.length + 1) : file
}
// noinspection JSMethodCanBeStatic
get isDebugEnabled() {
return debug.enabled
}
info(messageOrFields: Fields | null | string, message?: string) {
this.doLog(message, messageOrFields, "info")
}
error(messageOrFields: Fields | null | string, message?: string) {
this.doLog(message, messageOrFields, "error")
}
warn(messageOrFields: Fields | null | string, message?: string): void {
this.doLog(message, messageOrFields, "warn")
}
debug(fields: Fields | null, message: string) {
if (debug.enabled) {
this._doLog(message, fields, "debug")
}
}
private doLog(message: string | undefined | Error, messageOrFields: Fields | null | string, level: LogLevel) {
if (message === undefined) {
this._doLog(messageOrFields as string, null, level)
}
else {
this._doLog(message, messageOrFields as Fields | null, level)
}
}
private _doLog(message: string | Error, fields: Fields | null, level: LogLevel) {
// noinspection SuspiciousInstanceOfGuard
if (message instanceof Error) {
message = message.stack || message.toString()
}
else {
message = message.toString()
}
const levelIndicator = level === "error" ? "⨯" : "•"
const color = LEVEL_TO_COLOR[level]
this.stream.write(`${" ".repeat(PADDING)}${color(levelIndicator)} `)
this.stream.write(Logger.createMessage(this.messageTransformer(message, level), fields, level, color, PADDING + 2 /* level indicator and space */))
this.stream.write("\n")
}
static createMessage(message: string, fields: Fields | null, level: LogLevel, color: (it: string) => string, messagePadding = 0): string {
if (fields == null) {
return message
}
const fieldPadding = " ".repeat(Math.max(2, 16 - message.length))
let text = (level === "error" ? color(message) : message) + fieldPadding
const fieldNames = Object.keys(fields)
let counter = 0
for (const name of fieldNames) {
let fieldValue = fields[name]
let valuePadding: string | null = null
if (fieldValue != null && typeof fieldValue === "string" && fieldValue.includes("\n")) {
valuePadding = " ".repeat(messagePadding + message.length + fieldPadding.length + 2)
fieldValue = "\n" + valuePadding + fieldValue.replace(/\n/g, `\n${valuePadding}`)
}
else if (Array.isArray(fieldValue)) {
fieldValue = JSON.stringify(fieldValue)
}
else if (typeof fieldValue === "object") {
// fieldValue = safeStringifyJson(fieldValue)
}
text += `${color(name)}=${fieldValue}`
if (++counter !== fieldNames.length) {
if (valuePadding == null) {
text += " "
}
else {
text += "\n" + valuePadding
}
}
}
return text
}
log(message: string): void {
if (printer == null) {
this.stream.write(`${message}\n`)
}
else {
printer(message)
}
}
}
const LEVEL_TO_COLOR: { [index: string]: Chalk } = {
info: chalk.blue,
warn: chalk.yellow,
error: chalk.red,
debug: chalk.white,
}
export const log = new Logger(process.stdout)