patman: Make dry-run output match real functionality

When run with the --dry-run argument patman prints out information
showing what it would do.  This information currently doesn't line up
with what patman/git send-email really do.  Some basic examples:
- If an email address is addressed via "Series-cc" and "Patch-cc" patman
  shows that email address would be CC-ed two times.
- If an email address is addressed via "Series-to" and "Patch-cc" patman
  shows that email address would be sent TO and CC-ed.
- If an email address is addressed from a combination of tag aliases,
  get_maintainer.pl output, "Series-cc", "Patch-cc", etc patman shows
  that the email address would be CC-ed multiple times.

Patman currently does try to send duplicate emails like the --dry-run
output shows, but "git send-email" intelligently removes duplicate
addresses so this patch shouldn't change the non-dry-run functionality.

Change patman's output and email addressing to line up with the
"git send-email" logic.  This trims down patman's dry-run output and
prevents confusion about what patman will do when emails are actually
sent.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

tools/patman/gitutil.py

@@ -392,7 +392,8 @@ def EmailPatches(series, cover_fname, args, dry_run, raise_on_error, cc_fname,
                    "Or do something like this\n"
                    "git config sendemail.to u-boot@lists.denx.de")
             return
-    cc = BuildEmailList(series.get('cc'), '--cc', alias, raise_on_error)
+    cc = BuildEmailList(list(set(series.get('cc')) - set(series.get('to'))),
+                        '--cc', alias, raise_on_error)
     if self_only:
         to = BuildEmailList([os.getenv('USER')], '--to', alias, raise_on_error)
         cc = []

tools/patman/series.py

@@ -94,6 +94,9 @@ class Series(dict):
             cmd: The git command we would have run
             process_tags: Process tags as if they were aliases
         """
+        to_set = set(gitutil.BuildEmailList(self.to));
+        cc_set = set(gitutil.BuildEmailList(self.cc));
+
         col = terminal.Color()
         print 'Dry run, so not doing much. But I would do this:'
         print
@@ -106,24 +109,16 @@ class Series(dict):
             commit = self.commits[upto]
             print col.Color(col.GREEN, '   %s' % args[upto])
             cc_list = list(self._generated_cc[commit.patch])
-
-            # Skip items in To list
-            if 'to' in self:
-                try:
-                    map(cc_list.remove, gitutil.BuildEmailList(self.to))
-                except ValueError:
-                    pass
-
-            for email in cc_list:
+            for email in set(cc_list) - to_set - cc_set:
                 if email == None:
                     email = col.Color(col.YELLOW, "<alias '%s' not found>"
                             % tag)
                 if email:
                     print '      Cc: ',email
         print
-        for item in gitutil.BuildEmailList(self.get('to', '<none>')):
+        for item in to_set:
             print 'To:\t ', item
-        for item in gitutil.BuildEmailList(self.cc):
+        for item in cc_set - to_set:
             print 'Cc:\t ', item
         print 'Version: ', self.get('version')
         print 'Prefix:\t ', self.get('prefix')
@@ -131,7 +126,7 @@ class Series(dict):
             print 'Cover: %d lines' % len(self.cover)
             cover_cc = gitutil.BuildEmailList(self.get('cover_cc', ''))
             all_ccs = itertools.chain(cover_cc, *self._generated_cc.values())
-            for email in set(all_ccs):
+            for email in set(all_ccs) - to_set - cc_set:
                     print '      Cc: ',email
         if cmd:
             print 'Git command: %s' % cmd
@@ -230,7 +225,7 @@ class Series(dict):
 	    if add_maintainers:
                 list += get_maintainer.GetMaintainer(commit.patch)
             all_ccs += list
-            print >>fd, commit.patch, ', '.join(list)
+            print >>fd, commit.patch, ', '.join(set(list))
             self._generated_cc[commit.patch] = list
 
         if cover_fname: