# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 1500065225 -19800
# Node ID 754569f5e999916e16c2ed327d42d57fc8da4909
# Parent  1d1779734c9900ed4f15abf4bd8c903ff0d9820b
run-tests: make sure to check if pygments is installed before using it

e80041832e introduced support to color the output of tests but used pygments
without checking whether it's installed or not. That breaks test-run-tests.t for
machines which don't have pygments installed. This patch conditionalize the
color test in test-run-tests.t and also add a check to make sure pygments is
installed before using that.

diff -r 1d1779734c99 -r 754569f5e999 tests/run-tests.py
--- a/tests/run-tests.py	Sat Jul 15 13:21:23 2017 -0700
+++ b/tests/run-tests.py	Sat Jul 15 02:17:05 2017 +0530
@@ -89,7 +89,7 @@
 processlock = threading.Lock()
 
 with_color = False
-
+pygmentspresent = False
 # ANSI color is unsupported prior to Windows 10
 if os.name != 'nt':
     try: # is pygments installed
@@ -97,6 +97,7 @@
         import pygments.lexers as lexers
         import pygments.formatters as formatters
         with_color = True
+        pygmentspresent = True
     except ImportError:
         pass
 
@@ -1650,7 +1651,7 @@
                 else:
                     self.stream.write('\n')
                     for line in lines:
-                        if with_color:
+                        if with_color and pygmentspresent:
                             line = pygments.highlight(
                                     line,
                                     lexers.DiffLexer(),
diff -r 1d1779734c99 -r 754569f5e999 tests/test-run-tests.t
--- a/tests/test-run-tests.t	Sat Jul 15 13:21:23 2017 -0700
+++ b/tests/test-run-tests.t	Sat Jul 15 02:17:05 2017 +0530
@@ -121,7 +121,7 @@
 
 test diff colorisation
 
-#if no-windows
+#if no-windows pygments
   $ rt test-failure.t --color always
   
   \x1b[38;5;124m--- $TESTTMP/test-failure.t\x1b[39m (esc)