1 files changed, 15 insertions, 0 deletions
diff --git a/coverage/misc.py b/coverage/misc.py
index b99fbb81..ca09be7d 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -3,7 +3,9 @@
 import errno
 import hashlib
 import inspect
+import json
 import os
+import re
 
 from coverage import env
 from coverage.backward import string_class, to_bytes, unicode_class
@@ -170,6 +172,19 @@ def _needs_to_implement(that, func_name):
         )
 
 
+def pretty_data(data):
+    """Format data as JSON, but as nicely as possible.
+
+    Returns a string.
+
+    """
+    # Start with a basic JSON dump.
+    out = json.dumps(data, indent=4, sort_keys=True)
+    # But pairs of numbers shouldn't be split across lines...
+    out = re.sub(r"\[\s+(-?\d+),\s+(-?\d+)\s+]", r"[\1, \2]", out)
+    return out
+
+
 class CoverageException(Exception):
     """An exception specific to Coverage."""
     pass