git-send-email: two new options: to-cover, cc-cover

Allow extracting To/Cc addresses from the first patch
(typically the cover letter), and use them as To/Cc addresses of the
remainder of the series.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Documentation/git-send-email.txt

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index f0e57a5..b983053 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -248,6 +248,18 @@
 	cc list. Default is the value of 'sendemail.signedoffbycc' configuration
 	value; if that is unspecified, default to --signed-off-by-cc.
 
+--[no-]cc-cover::
+	If this is set, emails found in Cc: headers in the first patch of
+	the series (typically the cover letter) are added to the cc list
+	for each email set. Default is the value of 'sendemail.cccover'
+	configuration value; if that is unspecified, default to --no-cc-cover.
+
+--[no-]to-cover::
+	If this is set, emails found in To: headers in the first patch of
+	the series (typically the cover letter) are added to the to list
+	for each email set. Default is the value of 'sendemail.tocover'
+	configuration value; if that is unspecified, default to --no-to-cover.
+
 --suppress-cc=<category>::
 	Specify an additional category of recipients to suppress the
 	auto-cc of:

git-send-email.perl

diff --git a/git-send-email.perl b/git-send-email.perl
index 4c138a2..0084cf4 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -80,6 +80,8 @@
     --to-cmd                <str>  * Email To: via `<str> \$patch_path`
     --cc-cmd                <str>  * Email Cc: via `<str> \$patch_path`
     --suppress-cc           <str>  * author, self, sob, cc, cccmd, body, bodycc, all.
+    --[no-]cc-cover                * Email Cc: addresses in the cover letter.
+    --[no-]to-cover                * Email To: addresses in the cover letter.
     --[no-]signed-off-by-cc        * Send to Signed-off-by: addresses. Default on.
     --[no-]suppress-from           * Send to self. Default off.
     --[no-]chain-reply-to          * Chain In-Reply-To: fields. Default off.
@@ -195,6 +197,7 @@
 
 # Variables with corresponding config settings
 my ($thread, $chain_reply_to, $suppress_from, $signed_off_by_cc);
+my ($cover_cc, $cover_to);
 my ($to_cmd, $cc_cmd);
 my ($smtp_server, $smtp_server_port, @smtp_server_options);
 my ($smtp_authuser, $smtp_encryption, $smtp_ssl_cert_path);
@@ -211,6 +214,8 @@
     "chainreplyto" => [\$chain_reply_to, 0],
     "suppressfrom" => [\$suppress_from, undef],
     "signedoffbycc" => [\$signed_off_by_cc, undef],
+    "cccover" => [\$cover_cc, undef],
+    "tocover" => [\$cover_to, undef],
     "signedoffcc" => [\$signed_off_by_cc, undef],      # Deprecated
     "validate" => [\$validate, 1],
     "multiedit" => [\$multiedit, undef],
@@ -302,6 +307,8 @@
 		    "suppress-from!" => \$suppress_from,
 		    "suppress-cc=s" => \@suppress_cc,
 		    "signed-off-cc|signed-off-by-cc!" => \$signed_off_by_cc,
+		    "cc-cover|cc-cover!" => \$cover_cc,
+		    "to-cover|to-cover!" => \$cover_to,
 		    "confirm=s" => \$confirm,
 		    "dry-run" => \$dry_run,
 		    "envelope-sender=s" => \$envelope_sender,
@@ -1469,6 +1476,15 @@
 	@to = (@initial_to, @to);
 	@cc = (@initial_cc, @cc);
 
+	if ($message_num == 1) {
+		if (defined $cover_cc and $cover_cc) {
+			@initial_cc = @cc;
+		}
+		if (defined $cover_to and $cover_to) {
+			@initial_to = @to;
+		}
+	}
+
 	my $message_was_sent = send_message();
 
 	# set up for the next message