samba-tool viusalize: mark RODCs in distance matrix

RODCs should not be replicating out, which means they look alarming
when they are working properly. We label them as RODCs to reminds users
that no outbound replication is expected.

This results in slightly rejigged output formatting.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

python/samba/graph.py

@@ -513,7 +513,8 @@ def distance_matrix(vertices, edges,
                     colour=None,
                     shorten_names=False,
                     generate_key=False,
-                    grouping_function=None):
+                    grouping_function=None,
+                    row_comments=None):
     lines = []
     write = lines.append
 
@@ -525,8 +526,10 @@ def distance_matrix(vertices, edges,
         diagonal = '·'
         #missing = '🕱'
         missing = '-'
+        right_arrow = '←'
     else:
         vertical, horizontal, corner, diagonal, missing = '|-,0-'
+        right_arrow = '<-'
 
     colours = COLOUR_SETS[colour]
 
@@ -607,6 +610,9 @@ def distance_matrix(vertices, edges,
                     link = '+'
                 row.append('%s%s%s' % (ct, link, c_reset))
 
+        if row_comments is not None and row_comments[i]:
+            row.append('%s %s %s' % (c_reset, right_arrow, row_comments[i]))
+
         write('%s%*s%s %s%s' % (c, vlen, v, c_reset,
                                 ''.join(row), c_reset))