Add LoggingReporter.from_reporter() constructor

2 files changed, 8 insertions, 3 deletions

diff --git a/sphinx/io.py b/sphinx/io.py
index 418e91b12..5868bd7b5 100644
--- a/sphinx/io.py
+++ b/sphinx/io.py
@@ -58,9 +58,7 @@ class SphinxBaseReader(standalone.Reader):
         # type: () -> nodes.document
         document = standalone.Reader.new_document(self)
         reporter = document.reporter
-        document.reporter = LoggingReporter(reporter.source, reporter.report_level,
-                                            reporter.halt_level, reporter.debug_flag,
-                                            reporter.error_handler)
+        document.reporter = LoggingReporter.from_reporter(reporter)
         return document
 
 
diff --git a/sphinx/util/docutils.py b/sphinx/util/docutils.py
index 92e6c8c22..d24a8f827 100644
--- a/sphinx/util/docutils.py
+++ b/sphinx/util/docutils.py
@@ -167,6 +167,13 @@ class WarningStream(object):
 
 
 class LoggingReporter(Reporter):
+    @classmethod
+    def from_reporter(cls, reporter):
+        # type: (Reporter) -> LoggingReporter
+        """Create an instance of LoggingReporter from other reporter object."""
+        return cls(reporter.source, reporter.report_level, reporter.halt_level,
+                   reporter.debug_flag, reporter.error_handler)
+
     def __init__(self, source, report_level, halt_level,
                  debug=False, error_handler='backslashreplace'):
         # type: (unicode, int, int, bool, unicode) -> None