[svn r57321] merging the event branch:

* moving in test, misc, code, io directories and
  py/__init__.py
* py/bin/_find.py does not print to stderr anymore
* a few fixes to conftest files in other dirs
some more fixes and adjustments pending

--HG--
branch : trunk

py/test/looponfail/util.py

@@ -0,0 +1,70 @@
+import py
+from py.__.test import event
+
+class StatRecorder:
+    def __init__(self, rootdirlist):
+        self.rootdirlist = rootdirlist
+        self.statcache = {}
+        self.check() # snapshot state
+
+    def fil(self, p): 
+        return p.ext in ('.py', '.txt', '.c', '.h')
+    def rec(self, p):
+        return p.check(dotfile=0)
+
+    def waitonchange(self, checkinterval=1.0):
+        while 1:
+            changed = self.check()
+            if changed:
+                return
+            py.std.time.sleep(checkinterval)
+
+    def check(self, removepycfiles=True):
+        changed = False
+        statcache = self.statcache
+        newstat = {}
+        for rootdir in self.rootdirlist:
+            for path in rootdir.visit(self.fil, self.rec):
+                oldstat = statcache.get(path, None)
+                if oldstat is not None:
+                    del statcache[path]
+                try:
+                    newstat[path] = curstat = path.stat()
+                except py.error.ENOENT:
+                    if oldstat:
+                        del statcache[path]
+                        changed = True
+                else:
+                    if oldstat:
+                       if oldstat.mtime != curstat.mtime or \
+                          oldstat.size != curstat.size:
+                            changed = True
+                            print "# MODIFIED", path
+                            if removepycfiles and path.ext == ".py":
+                                pycfile = path + "c"
+                                if pycfile.check():
+                                    pycfile.remove()
+                                
+                    else:
+                        changed = True
+        if statcache:
+            changed = True
+        self.statcache = newstat
+        return changed
+
+
+class EventRecorder(object):
+    def __init__(self, bus):
+        self.events = []
+        self.bus = bus
+        self.bus.subscribe(self.events.append)
+
+    def getfailures(self):
+        return [ev for ev in self.events 
+                    if isinstance(ev, event.BaseReport) and \
+                       ev.failed]
+    def clear(self):
+        self.events[:] = []
+
+    def unsubscribe(self):
+        self.bus.unsubscribe(self.events.append)