diff --git a/src/gui/qt/worker.py b/src/gui/qt/worker.py
index b1b39ac..fca34bd 100644
--- a/src/gui/qt/worker.py
+++ b/src/gui/qt/worker.py
@@ -1,6 +1,5 @@
 import sys,os
 import time
-import re
 from tempfile import NamedTemporaryFile
 
 from PyQt4 import QtCore
@@ -8,6 +7,7 @@ from PyQt4 import QtCore
 parentdir = sys.path[0].split(os.sep)[:-1]
 sys.path.append(os.sep.join(parentdir))
 from tomblib.tomb import Tomb
+from tomblib.parser import parse_line
 
 class TombCreateThread(QtCore.QThread):
     line_received = QtCore.pyqtSignal(QtCore.QString)
@@ -58,7 +58,6 @@ class TombOutputThread(QtCore.QThread):
         #This could be simplified, and s/search/match, if --no-color supported
         #see #59
         #TODO: this should be moved to tomblib.parse
-        err_regex = re.compile(r'\[!\][^ ]* +(.+)$')
-        match = err_regex.search(line)
-        if match:
-            self.error_received.emit(match.group(1))
+        parsed = parse_line(line)
+        if parsed and parsed['type'] == 'error':
+            self.error_received.emit(parsed.content)
diff --git a/src/gui/tomblib/parser.py b/src/gui/tomblib/parser.py
new file mode 100644
index 0000000..5edc7cf
--- /dev/null
+++ b/src/gui/tomblib/parser.py
@@ -0,0 +1,20 @@
+'''
+Utilities to analyze tomb output
+'''
+import re
+
+_err_regex = re.compile(r'\[!\][^ ]* +(.+)$')
+def parse_line(line):
+    '''Analyze a single line.
+    Return None if no standard format is detected, a dict otherwise.
+    The fields 'type' and 'content' are always in the dict; 'content' may be
+    empty
+    'type' can be 'error', 'progress'
+    '''
+
+    match = _err_regex.search(line)
+    if match:
+        return { 'type': 'error', 'content': match.group(1) }
+    return None
+
+
diff --git a/src/gui/tomblib/tomb.py b/src/gui/tomblib/tomb.py
index 6f5abe1..7597351 100644
--- a/src/gui/tomblib/tomb.py
+++ b/src/gui/tomblib/tomb.py
@@ -28,7 +28,7 @@ class Tomb(object):
         Returns None on error, the path on success.
         '''
         try:
-            path=subprocess.check_output(['which', 'tomb'])
+            path = subprocess.check_output(['which', 'tomb'])
         except subprocess.CalledProcessError:
             return None
         return path
@@ -47,7 +47,7 @@ class Tomb(object):
         return True
 
     @classmethod
-    def create(cls, tombpath,tombsize,keypath, stdout=None, stderr=None, no_color=True, ignore_swap=False):
+    def create(cls, tombpath, tombsize,keypath, stdout=None, stderr=None, no_color=True, ignore_swap=False):
         '''If keypath is None, it will be created adjacent to the tomb.
         This is unsafe, and you should NOT do it.