Allow an optional msg and arguments to the log.info(<Error> err) logging form.

CHANGES.md

@@ -2,6 +2,15 @@
 
 ## bunyan 0.6.3 (not yet released)
 
+- Allow an optional `msg` and arguments to the `log.info(<Error> err)` logging
+  form. For example, before:
+
+        log.debug(my_error_instance)            // good
+        log.debug(my_error_instance, "boom!")   // wasn't allowed
+
+  Now the latter is allowed if you want to expliciting set the log msg. Of course
+  this applies to all the `log.{trace|debug|info...}()` methods.
+
 - `bunyan` cli output: clarify extra fields with quoting if empty or have
   spaces. E.g. 'cmd' and 'stderr' in the following:
 

lib/bunyan.js

@@ -657,7 +657,7 @@ Logger.prototype._emit = function (rec) {
  *
  * Usages:
  *    log.trace()  -> boolean is-trace-enabled
- *    log.trace(<Error> err)
+ *    log.trace(<Error> err, [<string> msg, ...])
  *    log.trace(<string> msg, ...)
  *    log.trace(<object> fields, <string> msg, ...)
  *
@@ -672,10 +672,14 @@ Logger.prototype.trace = function () {
     return (this.level <= TRACE);
   } else if (this.level > TRACE) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.trace(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.trace(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.trace(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);
@@ -692,7 +696,7 @@ Logger.prototype.trace = function () {
  *
  * Usages:
  *    log.debug()  -> boolean is-debug-enabled
- *    log.debug(<Error> err)
+ *    log.debug(<Error> err, [<string> msg, ...])
  *    log.debug(<string> msg, ...)
  *    log.debug(<object> fields, <string> msg, ...)
  *
@@ -707,10 +711,14 @@ Logger.prototype.debug = function () {
     return (this.level <= DEBUG);
   } else if (this.level > DEBUG) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.debug(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.debug(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.debug(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);
@@ -727,7 +735,7 @@ Logger.prototype.debug = function () {
  *
  * Usages:
  *    log.info()  -> boolean is-info-enabled
- *    log.info(<Error> err)
+ *    log.info(<Error> err, [<string> msg, ...])
  *    log.info(<string> msg, ...)
  *    log.info(<object> fields, <string> msg, ...)
  *
@@ -742,10 +750,14 @@ Logger.prototype.info = function () {
     return (this.level <= INFO);
   } else if (this.level > INFO) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.info(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.info(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.info(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);
@@ -762,7 +774,7 @@ Logger.prototype.info = function () {
  *
  * Usages:
  *    log.warn()  -> boolean is-warn-enabled
- *    log.warn(<Error> err)
+ *    log.warn(<Error> err, [<string> msg, ...])
  *    log.warn(<string> msg, ...)
  *    log.warn(<object> fields, <string> msg, ...)
  *
@@ -777,10 +789,14 @@ Logger.prototype.warn = function () {
     return (this.level <= WARN);
   } else if (this.level > WARN) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.warn(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.warn(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.warn(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);
@@ -797,7 +813,7 @@ Logger.prototype.warn = function () {
  *
  * Usages:
  *    log.error()  -> boolean is-error-enabled
- *    log.error(<Error> err)
+ *    log.error(<Error> err, [<string> msg, ...])
  *    log.error(<string> msg, ...)
  *    log.error(<object> fields, <string> msg, ...)
  *
@@ -812,10 +828,14 @@ Logger.prototype.error = function () {
     return (this.level <= ERROR);
   } else if (this.level > ERROR) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.error(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.error(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.error(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);
@@ -832,7 +852,7 @@ Logger.prototype.error = function () {
  *
  * Usages:
  *    log.fatal()  -> boolean is-fatal-enabled
- *    log.fatal(<Error> err)
+ *    log.fatal(<Error> err, [<string> msg, ...])
  *    log.fatal(<string> msg, ...)
  *    log.fatal(<object> fields, <string> msg, ...)
  *
@@ -847,10 +867,14 @@ Logger.prototype.fatal = function () {
     return (this.level <= FATAL);
   } else if (this.level > FATAL) {
     return;
-  } else if (arguments.length === 1 && arguments[0] instanceof Error) {
-    // `log.fatal(err)`
+  } else if (arguments[0] instanceof Error) {
+    // `log.fatal(err, ...)`
     fields = {err: errSerializer(arguments[0])};
-    msgArgs = [fields.err.message];
+    if (arguments.length === 1) {
+      msgArgs = [fields.err.message];
+    } else {
+      msgArgs = Array.prototype.slice.call(arguments, 1);
+    }
   } else if (typeof arguments[0] === 'string') {  // `log.fatal(msg, ...)`
     fields = null;
     msgArgs = Array.prototype.slice.call(arguments);