log: Make it possible to log exceptions

LogManager.st

@@ -51,6 +51,14 @@ Object extend [
         (self logManager)
             log: (LogEntry withMsg: aMessage level: LogLevel error area: anArea context: self)
     ]
+
+    logException: aMessage area: anArea [
+        <category: '*osmo-logging-exception'>
+        (self logManager)
+            exception: (LogEntry withMsg: aMessage
+                            level: LogLevel error
+                            area: anArea context: thisContext parentContext)
+    ]
 ]
 
 Object subclass: LogEntry [
@@ -191,6 +199,11 @@ Object subclass: LogTarget [
         <category: 'log'>
         self subclassResponsibility.
     ]
+
+    exception: anEntry [
+        <category: 'log'>
+        self subclassResponsibility.
+    ]
 ]
 
 LogTarget subclass: LogTranscriptTarget [
@@ -201,6 +214,12 @@ LogTarget subclass: LogTranscriptTarget [
         <category: 'log'>
         Transcript show: anEntry msg; nl.
     ]
+
+    exception: anEntry [
+        <category: 'log'>
+        Transcript show: anEntry msg; nl.
+        anEntry context backtraceOn: Transcript.
+    ]
 ]
 
 Object subclass: LogFilter [
@@ -276,6 +295,13 @@ Object subclass: LogManager [
         ]
     ]
 
+    exception: anEntry [
+        <category: 'log'>
+        self handle: anEntry ifTrue: [
+            target exception: anEntry.
+        ]
+    ]
+
     context: aString value: aValue [
         | key |
         key := Array with: 'LogArea' with: aString.

LogTest.st

@@ -16,7 +16,9 @@
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 "
 
-LogArea subclass: LogAreaSCCP [
+PackageLoader fileInPackage: #OsmoLogging.
+
+Osmo.LogArea subclass: LogAreaSCCP [
     LogAreaSCCP class >> areaName [
         ^ #sccp
     ]
@@ -35,4 +37,6 @@ LogArea subclass: LogAreaSCCP [
 
 Eval [
     '123' logDebug: 'TEST' area: #sccp.
+
+    '123' logException: 'TEST' area: #sccp.
 ]