debug: add 'pybehave' debug information

It shows the behavior flags from coverage.env.

2 files changed, 24 insertions, 2 deletions

diff --git a/coverage/control.py b/coverage/control.py
index 9dfa59fb..a3fda8d8 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -329,6 +329,19 @@ class Coverage:
                     write_formatted_info(self._debug, header, info)
                 wrote_any = True
 
+            if self._debug.should('pybehave'):
+                info = [
+                    (name, value) for name, value in env.__dict__.items()
+                    if not name.startswith("_") and
+                        name != "PYBEHAVIOR" and
+                        not isinstance(value, type(os))
+                ] + [
+                    (name, value) for name, value in env.PYBEHAVIOR.__dict__.items()
+                    if not name.startswith("_")
+                ]
+                write_formatted_info(self._debug, "pybehave", sorted(info))
+                wrote_any = True
+
         if wrote_any:
             write_formatted_info(self._debug, "end", ())
 
diff --git a/coverage/debug.py b/coverage/debug.py
index 74b59d0e..e6f93aa6 100644
--- a/coverage/debug.py
+++ b/coverage/debug.py
@@ -118,7 +118,10 @@ def info_formatter(info):
     for label, data in info:
         if data == []:
             data = "-none-"
-        if isinstance(data, (list, set, tuple)):
+        if isinstance(data, tuple) and len(repr(tuple(data))) < 30:
+            # Convert to tuple to scrub namedtuples.
+            yield "%*s: %r" % (label_len, label, tuple(data))
+        elif isinstance(data, (list, set, tuple)):
             prefix = "%*s:" % (label_len, label)
             for e in data:
                 yield "%*s %s" % (label_len+1, prefix, e)
@@ -128,7 +131,13 @@ def info_formatter(info):
 
 
 def write_formatted_info(writer, header, info):
-    """Write a sequence of (label,data) pairs nicely."""
+    """Write a sequence of (label,data) pairs nicely.
+
+    `writer` has a .write(str) method. `header` is a string to start the
+    section.  `info` is a sequence of (label, data) pairs, where label
+    is a str, and data can be a single value, or a list/set/tuple.
+
+    """
     writer.write(info_header(header))
     for line in info_formatter(info):
         writer.write(" %s" % line)