Added option for custom level colors (#36)

* enabled custom colors per level

* added option to accept colors when setting up the transport

* fixed linting issues

README.md

@@ -64,6 +64,36 @@ server.get("/", (request, reply) => {
 });
 ```
 
+## Custom level colors
+
+Custom levels colors could be used by passing it into logger opts. They can also overwrite the default level's colors. Check all the supported colors [here](https://github.com/jorgebucaran/colorette?tab=readme-ov-file#supported-colors).
+
+```js
+const server = fastify({
+  logger: {
+    transport: {
+      target: "@fastify/one-line-logger",
+      colors: {
+        35: "bgYellow",
+        45: "magenta",
+        60: "bgRedBright" // overwriting the `fatal` log color
+      }
+    },
+    customLevels: {
+      foo: 35,
+      bar: 45,
+    },
+  },
+});
+
+server.get("/", (request, reply) => {
+  request.log.fatal("An error occured");
+  request.log.foo("FOO!");
+  request.log.bar("BAR!");
+  reply.send({ foobar: true });
+});
+```
+
 <a id="license"></a>
 ## License
 

index.js

@@ -4,9 +4,9 @@ const pretty = require('pino-pretty')
 const messageFormatFactory = require('./lib/messageFormatFactory')
 
 const oneLineLogger = (opts = {}) => {
-  const { colorize, levels, ...rest } = opts
+  const { colorize, levels, colors, ...rest } = opts
 
-  const messageFormat = messageFormatFactory(colorize, levels)
+  const messageFormat = messageFormatFactory(colorize, levels, colors)
 
   return pretty({
     messageFormat,

lib/messageFormatFactory.js

@@ -2,8 +2,13 @@
 const formatDate = require('./formatDate')
 const colorizerFactory = require('pino-pretty').colorizerFactory
 
-const messageFormatFactory = (colorize, levels) => {
-  const colorizer = colorizerFactory(colorize === true)
+const messageFormatFactory = (colorize, levels, colors) => {
+  const customColors = colors != null
+    ? Object.entries(colors).reduce((colors, [level, color]) => {
+      return [...colors, [level, color]]
+    }, [])
+    : undefined
+  const colorizer = colorizerFactory(colorize === true, customColors)
 
   const levelLookUp = {
     60: colorizer('fatal').toLowerCase(),

test/index.test.js

@@ -113,3 +113,38 @@ logDescriptorColorizedLogPairs.forEach(([logDescriptor, logColorized]) => {
     })
   })
 }
+
+{
+  const levels = {
+    foo: 35,
+    bar: 45
+  }
+  const messageFormat = messageFormatFactory(true, levels, { 35: 'bgCyanBright', 45: 'yellow' })
+
+  const logCustomLevelsLogPairs = [
+    [
+      { time: EPOCH, level: 35, [MESSAGE_KEY]: 'basic foo log' },
+      `${TIME} - \u001B[106mfoo\u001B[49m - \u001B[36mbasic foo log\u001B[39m`
+    ],
+    [
+      {
+        time: EPOCH,
+        level: 45,
+        [MESSAGE_KEY]: 'basic incoming request bar log',
+        req: {
+          method: 'GET',
+          url: '/bar'
+        }
+      },
+      `${TIME} - \u001B[33mbar\u001B[39m - GET /bar - \u001B[36mbasic incoming request bar log\u001B[39m`
+    ]
+  ]
+  logCustomLevelsLogPairs.forEach(([logDescriptor, expectedLog]) => {
+    test('format log correctly with custom colors per level', (t) => {
+      const log = messageFormat(logDescriptor, MESSAGE_KEY)
+
+      t.equal(log, expectedLog)
+      t.end()
+    })
+  })
+}

types/index.d.ts

@@ -8,12 +8,17 @@ declare namespace oneLineLogger {
     url: string;
   }
 
+  export interface CustomColor {
+    [key: number]: string;
+  }
+
   export type LogDescriptor = Record<string, unknown> & {
     time: number;
     level: number;
+    colors?: CustomColor;
     req?: Request;
   }
-  export const messageFormatFactory: (colorize: boolean, levels: Record<string, number>) => (log: LogDescriptor, messageKey: string) => string
+  export const messageFormatFactory: (colorize: boolean, levels: Record<string, number>, colors?: CustomColor) => (log: LogDescriptor, messageKey: string) => string
 
   export const oneLineLogger: OneLineLogger
   export { oneLineLogger as default}

types/index.test-d.ts

@@ -1,11 +1,12 @@
+import pretty from 'pino-pretty';
+import { expectType } from "tsd";
 import oneLineLogger, {
-  Request,
+  CustomColor,
   LogDescriptor,
+  Request,
   messageFormatFactory,
   oneLineLogger as oneLineLoggerNamed
 } from "..";
-import { expectType } from "tsd"
-import pretty from 'pino-pretty'
 
 expectType<string>(({} as Request).method)
 expectType<string>(({} as Request).url)
@@ -14,7 +15,7 @@ expectType<number>(({} as LogDescriptor).level)
 expectType<number>(({} as LogDescriptor).time)
 expectType<Request | undefined>(({} as LogDescriptor).req)
 
-expectType<(colorize: boolean, levels: Record<string, number>) => (log: LogDescriptor, messageKey: string) => string>(messageFormatFactory)
+expectType<(colorize: boolean, levels: Record<string, number>, colors?: CustomColor) => (log: LogDescriptor, messageKey: string) => string>(messageFormatFactory)
 
 expectType<typeof oneLineLogger>(oneLineLoggerNamed)
 expectType<(opts?: pretty.PrettyOptions) => pretty.PrettyStream>(oneLineLogger)