1 files changed, 21 insertions, 1 deletions
diff --git a/coverage/misc.py b/coverage/misc.py
index fd9be857..473d7d43 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -1,6 +1,10 @@
 """Miscellaneous stuff for Coverage."""
 
+import errno
 import inspect
+import os
+import sys
+
 from coverage.backward import md5, sorted       # pylint: disable=W0622
 from coverage.backward import string_class, to_bytes
 
@@ -50,6 +54,12 @@ def format_lines(statements, lines):
     return ret
 
 
+def short_stack():
+    """Return a string summarizing the call stack."""
+    stack = inspect.stack()[:0:-1]
+    return "\n".join(["%30s : %s @%d" % (t[3],t[1],t[2]) for t in stack])
+
+
 def expensive(fn):
     """A decorator to cache the result of an expensive operation.
 
@@ -76,13 +86,23 @@ def bool_or_none(b):
 def join_regex(regexes):
     """Combine a list of regexes into one that matches any of them."""
     if len(regexes) > 1:
-        return "(" + ")|(".join(regexes) + ")"
+        return "|".join(["(%s)" % r for r in regexes])
     elif regexes:
         return regexes[0]
     else:
         return ""
 
 
+def file_be_gone(path):
+    """Remove a file, and don't get annoyed if it doesn't exist."""
+    try:
+        os.remove(path)
+    except OSError:
+        _, e, _ = sys.exc_info()
+        if e.errno != errno.ENOENT:
+            raise
+
+
 class Hasher(object):
     """Hashes Python data into md5."""
     def __init__(self):