wvtest.py: add WVSTART for standalone python tests

Add a WVSTART function so that we can use it in future t/foo tests
written in python.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Tested-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/wvtest.py b/wvtest.py
index 61245b29bc4fc976634624b88f1d48e7f409fa37..8a8302be10c2daec80a6768625a2183fe0930051 100755 (executable)
--- a/wvtest.py
+++ b/wvtest.py
@@ -65,18 +65,18 @@ if __name__ != '__main__':   # we're imported as a module
         sys.stdout.flush()
 
 
-    def _caller_stack():
+    def _caller_stack(wv_call_depth):
         # Without the chdir, the source text lookup may fail
         orig = os.getcwd()
         os.chdir(_start_dir)
         try:
-            return traceback.extract_stack()[-4]
+            return traceback.extract_stack()[-(wv_call_depth + 2)]
         finally:
             os.chdir(orig)
 
 
     def _check(cond, msg = 'unknown', tb = None):
-        if tb == None: tb = _caller_stack()
+        if tb == None: tb = _caller_stack(2)
         if cond:
             _result(msg, tb, 'ok')
         else:
@@ -85,12 +85,16 @@ if __name__ != '__main__':   # we're imported as a module
 
     _code_rx = re.compile(r'^\w+\((.*)\)(\s*#.*)?$')
     def _code():
-        text = _caller_stack()[3]
+        text = _caller_stack(2)[3]
         return _code_rx.sub(r'\1', text)
 
+    def WVSTART(message):
+        filename = _caller_stack(1)[0]
+        sys.stderr.write('Testing \"' + message + '\" in ' + filename + ':\n')
+
     def WVMSG(message):
         ''' Issues a notification. '''
-        return _result(message, _caller_stack(), 'ok')
+        return _result(message, _caller_stack(1), 'ok')
 
     def WVPASS(cond = True):
         ''' Counts a test failure unless cond is true. '''