validate:launcher: Try to dump logs with bat if avalaible

We got to many issues with mdv, it seems not to be maintained
bat is a very good replacement.

validate/launcher/baseclasses.py

@@ -52,10 +52,6 @@ try:
 except ImportError:
     import xml.etree.cElementTree as ET
 
-try:
-    import mdv
-except ImportError:
-    mdv = None
 
 from .vfb_server import get_virual_frame_buffer_server
 from .httpserver import HTTPServer
@@ -638,13 +634,16 @@ class Test(Loggable):
         self.start_ts = time.time()
 
     def _dump_log_file(self, logfile):
+        if which('bat'):
+            try:
+                subprocess.check_call(['bat', '-H', '1', '--paging=never', logfile])
+                return
+            except (subprocess.CalledProcessError, FileNotFoundError):
+                pass
+
         with open(logfile, 'r') as fin:
-            printc(self.get_logfile_repr())
-            if mdv and utils.supports_ansi_colors():
-                printc(mdv.main(fin.read()))
-            else:
-                for line in fin.readlines():
-                    print('> ' + line, end='')
+            for line in fin.readlines():
+                print('> ' + line, end='')
 
     def _dump_log_files(self):
         self._dump_log_file(self.logfile)

validate/launcher/main.py

@@ -463,7 +463,8 @@ class LauncherConfig(Loggable):
         parser.add_argument("--dump-on-failure", dest="dump_on_failure",
                             action="store_true", default=False,
                             help="Dump logs to stdout when a test fails."
-                            " Note that mdv is used to enhance output if avalaible, install with `pip install mdv`.")
+                            " Note that bat is used to enhance output if available"
+                            " (See https://github.com/sharkdp/bat)")
         parser.add_argument("--max-dump-size", dest="max_dump_size", type=float,
                             default=0.5, help="Maximum size of logs to dump on stdout in MB.")
         parser.add_argument("-c", "--config", dest="config",