Merge branch 'db/cover-letter'

* db/cover-letter:
  Improve collection of information for format-patch --cover-letter
  Add API access to shortlog
  t4014: Replace sed's non-standard 'Q' by standard 'q'
  Support a --cc=<email> option in format-patch
  Combine To: and Cc: headers
  Fix format.headers not ending with a newline
  Add tests for extra headers in format-patch
  Add a --cover-letter option to format-patch
  Export some email and pretty-printing functions
  Improve message-id generation flow control for format-patch
  Add more tests for format-patch

Conflicts:

	builtin-log.c
	builtin-shortlog.c
	pretty.c

1 files changed, 68 insertions, 58 deletions

diff --git a/log-tree.c b/log-tree.c
index e9ba6df9d2..608f697cf3 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -137,6 +137,72 @@ static int has_non_ascii(const char *s)
 	return 0;
 }
 
+void log_write_email_headers(struct rev_info *opt, const char *name,
+			     const char **subject_p, const char **extra_headers_p)
+{
+	const char *subject = NULL;
+	const char *extra_headers = opt->extra_headers;
+	if (opt->total > 0) {
+		static char buffer[64];
+		snprintf(buffer, sizeof(buffer),
+			 "Subject: [%s %0*d/%d] ",
+			 opt->subject_prefix,
+			 digits_in_number(opt->total),
+			 opt->nr, opt->total);
+		subject = buffer;
+	} else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
+		static char buffer[256];
+		snprintf(buffer, sizeof(buffer),
+			 "Subject: [%s] ",
+			 opt->subject_prefix);
+		subject = buffer;
+	} else {
+		subject = "Subject: ";
+	}
+
+	printf("From %s Mon Sep 17 00:00:00 2001\n", name);
+	if (opt->message_id)
+		printf("Message-Id: <%s>\n", opt->message_id);
+	if (opt->ref_message_id)
+		printf("In-Reply-To: <%s>\nReferences: <%s>\n",
+		       opt->ref_message_id, opt->ref_message_id);
+	if (opt->mime_boundary) {
+		static char subject_buffer[1024];
+		static char buffer[1024];
+		snprintf(subject_buffer, sizeof(subject_buffer) - 1,
+			 "%s"
+			 "MIME-Version: 1.0\n"
+			 "Content-Type: multipart/mixed;"
+			 " boundary=\"%s%s\"\n"
+			 "\n"
+			 "This is a multi-part message in MIME "
+			 "format.\n"
+			 "--%s%s\n"
+			 "Content-Type: text/plain; "
+			 "charset=UTF-8; format=fixed\n"
+			 "Content-Transfer-Encoding: 8bit\n\n",
+			 extra_headers ? extra_headers : "",
+			 mime_boundary_leader, opt->mime_boundary,
+			 mime_boundary_leader, opt->mime_boundary);
+		extra_headers = subject_buffer;
+
+		snprintf(buffer, sizeof(buffer) - 1,
+			 "--%s%s\n"
+			 "Content-Type: text/x-patch;"
+			 " name=\"%s.diff\"\n"
+			 "Content-Transfer-Encoding: 8bit\n"
+			 "Content-Disposition: %s;"
+			 " filename=\"%s.diff\"\n\n",
+			 mime_boundary_leader, opt->mime_boundary,
+			 name,
+			 opt->no_inline ? "attachment" : "inline",
+			 name);
+		opt->diffopt.stat_sep = buffer;
+	}
+	*subject_p = subject;
+	*extra_headers_p = extra_headers;
+}
+
 void show_log(struct rev_info *opt, const char *sep)
 {
 	struct strbuf msgbuf;
@@ -188,64 +254,8 @@ void show_log(struct rev_info *opt, const char *sep)
 	 */
 
 	if (opt->commit_format == CMIT_FMT_EMAIL) {
-		char *sha1 = sha1_to_hex(commit->object.sha1);
-		if (opt->total > 0) {
-			static char buffer[64];
-			snprintf(buffer, sizeof(buffer),
-					"Subject: [%s %0*d/%d] ",
-					opt->subject_prefix,
-					digits_in_number(opt->total),
-					opt->nr, opt->total);
-			subject = buffer;
-		} else if (opt->total == 0 && opt->subject_prefix && *opt->subject_prefix) {
-			static char buffer[256];
-			snprintf(buffer, sizeof(buffer),
-					"Subject: [%s] ",
-					opt->subject_prefix);
-			subject = buffer;
-		} else {
-			subject = "Subject: ";
-		}
-
-		printf("From %s Mon Sep 17 00:00:00 2001\n", sha1);
-		if (opt->message_id)
-			printf("Message-Id: <%s>\n", opt->message_id);
-		if (opt->ref_message_id)
-			printf("In-Reply-To: <%s>\nReferences: <%s>\n",
-			       opt->ref_message_id, opt->ref_message_id);
-		if (opt->mime_boundary) {
-			static char subject_buffer[1024];
-			static char buffer[1024];
-			snprintf(subject_buffer, sizeof(subject_buffer) - 1,
-				 "%s"
-				 "MIME-Version: 1.0\n"
-				 "Content-Type: multipart/mixed;"
-				 " boundary=\"%s%s\"\n"
-				 "\n"
-				 "This is a multi-part message in MIME "
-				 "format.\n"
-				 "--%s%s\n"
-				 "Content-Type: text/plain; "
-				 "charset=UTF-8; format=fixed\n"
-				 "Content-Transfer-Encoding: 8bit\n\n",
-				 extra_headers ? extra_headers : "",
-				 mime_boundary_leader, opt->mime_boundary,
-				 mime_boundary_leader, opt->mime_boundary);
-			extra_headers = subject_buffer;
-
-			snprintf(buffer, sizeof(buffer) - 1,
-				 "--%s%s\n"
-				 "Content-Type: text/x-patch;"
-				 " name=\"%s.diff\"\n"
-				 "Content-Transfer-Encoding: 8bit\n"
-				 "Content-Disposition: %s;"
-				 " filename=\"%s.diff\"\n\n",
-				 mime_boundary_leader, opt->mime_boundary,
-				 sha1,
-				 opt->no_inline ? "attachment" : "inline",
-				 sha1);
-			opt->diffopt.stat_sep = buffer;
-		}
+		log_write_email_headers(opt, sha1_to_hex(commit->object.sha1),
+					&subject, &extra_headers);
 	} else if (opt->commit_format != CMIT_FMT_USERFORMAT) {
 		fputs(diff_get_color_opt(&opt->diffopt, DIFF_COMMIT), stdout);
 		if (opt->commit_format != CMIT_FMT_ONELINE)