git-send-email: Generalize auto-cc recipient mechanism.

There are a few options to git-send-email to suppress the automatic
generation of 'Cc' fields: --suppress-from, and --signed-off-cc.
However, there are other times that git-send-email automatically
includes Cc'd recipients.  This is not desirable for all development
environments.

Add a new option --suppress-cc, which can be specified one or more
times to list the categories of auto-cc fields that should be
suppressed.  If not specified, it defaults to values to give the same
behavior as specified by --suppress-from, and --signed-off-cc.  The
categories are:

  self   - patch sender.  Same as --suppress-from.
  author - patch author.
  cc     - cc lines mentioned in the patch.
  cccmd  - avoid running the cccmd.
  sob    - signed off by lines.
  all    - all non-explicit recipients

Signed-off-by: David Brown <git@davidb.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-send-email.txt

@@ -117,6 +117,17 @@ The --cc option must be repeated for each user you want on the cc list.
         Default is the value of 'sendemail.suppressfrom' configuration value;
         if that is unspecified, default to --no-suppress-from.
 
+--suppress-cc::
+	Specify an additional category of recipients to suppress the
+	auto-cc of.  'self' will avoid including the sender, 'author' will
+	avoid including the patch author, 'cc' will avoid including anyone
+	mentioned in Cc lines in the patch, 'sob' will avoid including
+	anyone mentioned in Signed-off-by lines, and 'cccmd' will avoid
+	running the --cc-cmd.  'all' will suppress all auto cc values.
+	Default is the value of 'sendemail.suppresscc' configuration value;
+	if that is unspecified, default to 'self' if --suppress-from is
+	specified, as well as 'sob' if --no-signed-off-cc is specified.
+
 --thread, --no-thread::
 	If this is set, the In-Reply-To header will be set on each email sent.
 	If disabled with "--no-thread", no emails will have the In-Reply-To

git-send-email.perl

@@ -88,6 +88,12 @@ Options:
 
    --smtp-ssl     If set, connects to the SMTP server using SSL.
 
+   --suppress-cc  Suppress the specified category of auto-CC.  The category
+		  can be one of 'author' for the patch author, 'self' to
+		  avoid copying yourself, 'sob' for Signed-off-by lines,
+		  'cccmd' for the output of the cccmd, or 'all' to suppress
+		  all of these.
+
    --suppress-from Suppress sending emails to yourself. Defaults to off.
 
    --thread       Specify that the "In-Reply-To:" header should be set on all
@@ -180,12 +186,13 @@ my ($thread, $chain_reply_to, $suppress_from, $signed_off_cc, $cc_cmd);
 my ($smtp_server, $smtp_server_port, $smtp_authuser, $smtp_authpass, $smtp_ssl);
 my ($identity, $aliasfiletype, @alias_files, @smtp_host_parts);
 my ($no_validate);
+my (@suppress_cc);
 
 my %config_bool_settings = (
     "thread" => [\$thread, 1],
     "chainreplyto" => [\$chain_reply_to, 1],
-    "suppressfrom" => [\$suppress_from, 0],
-    "signedoffcc" => [\$signed_off_cc, 1],
+    "suppressfrom" => [\$suppress_from, undef],
+    "signedoffcc" => [\$signed_off_cc, undef],
     "smtpssl" => [\$smtp_ssl, 0],
 );
 
@@ -199,6 +206,7 @@ my %config_settings = (
     "aliasfiletype" => \$aliasfiletype,
     "bcc" => \@bcclist,
     "aliasesfile" => \@alias_files,
+    "suppresscc" => \@suppress_cc,
 );
 
 # Begin by accumulating all the variables (defined above), that we will end up
@@ -221,6 +229,7 @@ my $rc = GetOptions("sender|from=s" => \$sender,
 		    "quiet" => \$quiet,
 		    "cc-cmd=s" => \$cc_cmd,
 		    "suppress-from!" => \$suppress_from,
+		    "suppress-cc=s" => \@suppress_cc,
 		    "signed-off-cc|signed-off-by-cc!" => \$signed_off_cc,
 		    "dry-run" => \$dry_run,
 		    "envelope-sender=s" => \$envelope_sender,
@@ -266,6 +275,35 @@ foreach my $setting (values %config_bool_settings) {
 	${$setting->[0]} = $setting->[1] unless (defined (${$setting->[0]}));
 }
 
+# Set CC suppressions
+my(%suppress_cc);
+if (@suppress_cc) {
+	foreach my $entry (@suppress_cc) {
+		die "Unknown --suppress-cc field: '$entry'\n"
+			unless $entry =~ /^(all|cccmd|cc|author|self|sob)$/;
+		$suppress_cc{$entry} = 1;
+	}
+}
+
+if ($suppress_cc{'all'}) {
+	foreach my $entry (qw (ccmd cc author self sob)) {
+		$suppress_cc{$entry} = 1;
+	}
+	delete $suppress_cc{'all'};
+}
+
+# If explicit old-style ones are specified, they trump --suppress-cc.
+$suppress_cc{'self'} = $suppress_from if defined $suppress_from;
+$suppress_cc{'sob'} = $signed_off_cc if defined $signed_off_cc;
+
+# Debugging, print out the suppressions.
+if (0) {
+	print "suppressions:\n";
+	foreach my $entry (keys %suppress_cc) {
+		printf "  %-5s -> $suppress_cc{$entry}\n", $entry;
+	}
+}
+
 my ($repoauthor) = $repo->ident_person('author');
 my ($repocommitter) = $repo->ident_person('committer');
 
@@ -711,11 +749,14 @@ foreach my $t (@files) {
 
 				} elsif (/^(Cc|From):\s+(.*)$/) {
 					if (unquote_rfc2047($2) eq $sender) {
-						next if ($suppress_from);
+						next if ($suppress_cc{'self'});
 					}
 					elsif ($1 eq 'From') {
 						($author, $author_encoding)
 						  = unquote_rfc2047($2);
+						next if ($suppress_cc{'author'});
+					} else {
+						next if ($suppress_cc{'cc'});
 					}
 					printf("(mbox) Adding cc: %s from line '%s'\n",
 						$2, $_) unless $quiet;
@@ -742,7 +783,7 @@ foreach my $t (@files) {
 				# line 2 = subject
 				# So let's support that, too.
 				$input_format = 'lots';
-				if (@cc == 0) {
+				if (@cc == 0 && !$suppress_cc{'cc'}) {
 					printf("(non-mbox) Adding cc: %s from line '%s'\n",
 						$_, $_) unless $quiet;
 
@@ -759,10 +800,11 @@ foreach my $t (@files) {
 			}
 		} else {
 			$message .=  $_;
-			if (/^(Signed-off-by|Cc): (.*)$/i && $signed_off_cc) {
+			if (/^(Signed-off-by|Cc): (.*)$/i) {
+				next if ($suppress_cc{'sob'});
 				my $c = $2;
 				chomp $c;
-				next if ($c eq $sender and $suppress_from);
+				next if ($c eq $sender and $suppress_cc{'self'});
 				push @cc, $c;
 				printf("(sob) Adding cc: %s from line '%s'\n",
 					$c, $_) unless $quiet;
@@ -771,7 +813,7 @@ foreach my $t (@files) {
 	}
 	close F;
 
-	if (defined $cc_cmd) {
+	if (defined $cc_cmd && !$suppress_cc{'cccmd'}) {
 		open(F, "$cc_cmd $t |")
 			or die "(cc-cmd) Could not execute '$cc_cmd'";
 		while(<F>) {