Add support to hide metadata in log line

Readme.md

@@ -100,6 +100,7 @@ node app.js | pino-pretty
 - `--hideObject` (`-H`): Hide objects from output (but not error object)
 - `--singleLine` (`-S`): Print each log message on a single line (errors will still be multi-line)
 - `--config`: Specify a path to a config file containing the pino-pretty options.  pino-pretty will attempt to read from a `.pino-prettyrc` in your current directory (`process.cwd`) if not specified
+- `--hideMetadata` (`-M`): Hide Metadata (e.g. `timestamp` and `level`) in the beginning of each log line
 
 <a id="integration"></a>
 ## Programmatic Integration
@@ -258,6 +259,7 @@ The options accepted have keys corresponding to the options described in [CLI Ar
   levelLabel: 'levelLabel', // --levelLabel
   minimumLevel: 'info', // --minimumLevel
   useOnlyCustomProps: true, // --useOnlyCustomProps
+  hideMetadata: true, // --hideMetadata
   // The file or file descriptor (1 is stdout) to write to
   destination: 1,
 

bin.js

@@ -58,7 +58,8 @@ let opts = minimist(process.argv, {
     ignore: 'i',
     include: 'I',
     hideObject: 'H',
-    singleLine: 'S'
+    singleLine: 'S',
+    hideMetadata: 'M'
   },
   default: {
     messageKey: DEFAULT_VALUE,

index.js

@@ -49,7 +49,8 @@ const defaultOptions = {
   hideObject: false,
   ignore: 'hostname',
   include: undefined,
-  singleLine: false
+  singleLine: false,
+  hideMetadata: false
 }
 
 function prettyFactory (options) {
@@ -127,39 +128,10 @@ function prettyFactory (options) {
       log = filterLog({ log, ignoreKeys, includeKeys })
     }
 
-    const prettifiedLevel = prettifyLevel({ log, colorizer, levelKey, prettifier: customPrettifiers.level, ...customProps })
-    const prettifiedMetadata = prettifyMetadata({ log, prettifiers: customPrettifiers })
-    const prettifiedTime = prettifyTime({ log, translateFormat: opts.translateTime, timestampKey, prettifier: customPrettifiers.time })
-
     let line = ''
-    if (opts.levelFirst && prettifiedLevel) {
-      line = `${prettifiedLevel}`
-    }
-
-    if (prettifiedTime && line === '') {
-      line = `${prettifiedTime}`
-    } else if (prettifiedTime) {
-      line = `${line} ${prettifiedTime}`
-    }
-
-    if (!opts.levelFirst && prettifiedLevel) {
-      if (line.length > 0) {
-        line = `${line} ${prettifiedLevel}`
-      } else {
-        line = prettifiedLevel
-      }
-    }
-
-    if (prettifiedMetadata) {
-      if (line.length > 0) {
-        line = `${line} ${prettifiedMetadata}:`
-      } else {
-        line = prettifiedMetadata
-      }
-    }
 
-    if (line.endsWith(':') === false && line !== '') {
-      line += ':'
+    if (!opts.hideMetadata) {
+      line += createLineMetadata()
     }
 
     if (prettifiedMessage !== undefined) {
@@ -206,6 +178,46 @@ function prettyFactory (options) {
     }
 
     return line
+
+    function createLineMetadata () {
+      let lineMetadata = ''
+
+      const prettifiedLevel = prettifyLevel({ log, colorizer, levelKey, prettifier: customPrettifiers.level, ...customProps })
+      const prettifiedMetadata = prettifyMetadata({ log, prettifiers: customPrettifiers })
+      const prettifiedTime = prettifyTime({ log, translateFormat: opts.translateTime, timestampKey, prettifier: customPrettifiers.time })
+
+      if (opts.levelFirst && prettifiedLevel) {
+        lineMetadata = `${prettifiedLevel}`
+      }
+
+      if (prettifiedTime && lineMetadata === '') {
+        lineMetadata = `${prettifiedTime}`
+      } else if (prettifiedTime) {
+        lineMetadata = `${lineMetadata} ${prettifiedTime}`
+      }
+
+      if (!opts.levelFirst && prettifiedLevel) {
+        if (lineMetadata.length > 0) {
+          lineMetadata = `${lineMetadata} ${prettifiedLevel}`
+        } else {
+          lineMetadata = prettifiedLevel
+        }
+      }
+
+      if (prettifiedMetadata) {
+        if (lineMetadata.length > 0) {
+          lineMetadata = `${lineMetadata} ${prettifiedMetadata}:`
+        } else {
+          lineMetadata = prettifiedMetadata
+        }
+      }
+
+      if (lineMetadata.endsWith(':') === false && lineMetadata !== '') {
+        lineMetadata += ':'
+      }
+
+      return lineMetadata
+    }
   }
 }
 

test/basic.test.js

@@ -118,6 +118,26 @@ test('basic prettifier tests', (t) => {
     log.info('foo')
   })
 
+  t.test('can hide date and level', (t) => {
+    t.plan(1)
+    const destination = new Writable({
+      write (formatted, enc, cb) {
+        t.equal(
+          formatted.toString(),
+          'foo\n'
+        )
+        cb()
+      }
+    })
+    const pretty = pinoPretty({
+      destination,
+      hideMetadata: true,
+      colorize: false
+    })
+    const log = pino({}, pretty)
+    log.info('foo')
+  })
+
   t.test('can print message key value when its a string', (t) => {
     t.plan(1)
     const pretty = prettyFactory()

test/cli.test.js

@@ -37,6 +37,19 @@ test('cli', (t) => {
     })
   })
 
+  ;['--hideMetadata', '-M'].forEach((optionName) => {
+    t.test(`hides epoch, level and metadata via ${optionName}`, (t) => {
+      t.plan(1)
+      const child = spawn(process.argv[0], [bin, optionName], { env })
+      child.on('error', t.threw)
+      child.stdout.on('data', (data) => {
+        t.equal(data.toString(), 'hello world\n')
+      })
+      child.stdin.write(logLine)
+      t.teardown(() => child.kill())
+    })
+  })
+
   ;['--translateTime', '-t'].forEach((optionName) => {
     t.test(`translates time to default format via ${optionName}`, (t) => {
       t.plan(1)