[PATCH] Make display_lines() spawn diff

[Ramkumar Ramachandra]

Hi,

This patch is not intended for inclusion, but I hope it conveys the
idea- I want display_lines() to display a diff instead of the full
actual and expected outputs.

Thanks.

Index: subversion/tests/cmdline/svntest/verify.py
===================================================================
--- subversion/tests/cmdline/svntest/verify.py  (revision 978817)
+++ subversion/tests/cmdline/svntest/verify.py  (working copy)
@@ -24,7 +24,7 @@
 #    under the License.
 ######################################################################
 
-import re, sys
+import re, sys, tempfile
 
 import svntest
 
@@ -275,22 +275,16 @@ def display_lines(message, label, expected, actual
   Both EXPECTED and ACTUAL may be strings or lists of strings."""
   if message is not None:
     print(message)
-  if expected is not None:
-    output = 'EXPECTED %s' % label
-    if expected_is_regexp:
-      output += ' (regexp)'
-    if expected_is_unordered:
-      output += ' (unordered)'
-    output += ':'
-    print(output)
-    for x in expected:
-      sys.stdout.write(x)
-    if expected_is_regexp:
-      sys.stdout.write('\n')
-  if actual is not None:
-    print('ACTUAL %s:' % label)
-    for x in actual:
-      sys.stdout.write(x)
+  actual_file = tempfile.NamedTemporaryFile(delete=False)
+  expected_file = tempfile.NamedTemporaryFile(delete=False)
+  actual_file.write("".join(actual))
+  expected_file.write("".join(expected))
+  actual_file.close()
+  expected_file.close()
+  exit_code, stdout_output, stderr_output = \
+      svntest.main.run_command("diff", 1, 0, '-a', '-u', \
+                                 actual_file.name, expected_file.name)
+  print "".join(stdout_output)
 
 def compare_and_display_lines(message, label, expected, actual,
                               raisable=None):