[PATCH v3 4/4] format-patch: add format.cover-letter configuration

@@ -1092,6 +1092,12 @@ format.signoff::
     the rights to submit this work under the same open source license.
     Please see the 'SubmittingPatches' document for further discussion.
 
+format.cover-letter::
+	Allows to configure the --cover-letter option of format-patch by
+	default. In addition, you can set it to 'auto' to automatically
+	determine based on the number of patches (generate if there's more than
+	one).
+
 filter.<driver>.clean::
 	The command which is used to convert the content of a worktree
 	file to a blob upon checkin.  See linkgit:gitattributes[5] for

@@ -20,7 +20,7 @@ SYNOPSIS
 		   [--ignore-if-in-upstream]
 		   [--subject-prefix=Subject-Prefix] [(--reroll-count|-v) <n>]
 		   [--to=<email>] [--cc=<email>]
-		   [--cover-letter] [--quiet] [--notes[=<ref>]]
+		   [--[no-]cover-letter] [--quiet] [--notes[=<ref>]]
 		   [<common diff options>]
 		   [ <since> | <revision range> ]
 

@@ -195,7 +195,7 @@ will want to ensure that threading is disabled for `git send-email`.
 	`Cc:`, and custom) headers added so far from config or command
 	line.
 
---cover-letter::
+--[no-]cover-letter::
 	In addition to the patches, generate a cover letter file
 	containing the shortlog and the overall diffstat.  You can
 	fill in a description in the file before sending it out.

@@ -260,6 +260,7 @@ attachments, and sign off patches with configuration variables.
 	cc = <email>
 	attach [ = mime-boundary-string ]
 	signoff = true
+	cover-letter = auto
 ------------
 
 

@@ -618,6 +618,7 @@ static void add_header(const char *value)
 #define THREAD_DEEP 2
 static int thread;
 static int do_signoff;
+static int cover_letter;
 static const char *signature = git_version_string;
 
 static int git_format_config(const char *var, const char *value, void *cb)

@@ -680,6 +681,17 @@ static int git_format_config(const char *var, const char *value, void *cb)
 	}
 	if (!strcmp(var, "format.signature"))
 		return git_config_string(&signature, var, value);
+	if (!strcmp(var, "format.cover-letter")) {
+		if (cover_letter != -1)
+			/* user overrode it */
+			return 0;
+		if (value && !strcasecmp(value, "auto")) {
+			cover_letter = -1;
+			return 0;
+		}
+		cover_letter = git_config_bool(var, value);
+		return 0;
+	}
 
 	return git_log_config(var, value, cb);
 }

@@ -1071,7 +1083,6 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	int start_number = -1;
 	int just_numbers = 0;
 	int ignore_if_in_upstream = 0;
-	int cover_letter = 0;
 	int boundary_count = 0;
 	int no_binary_diff = 0;
 	struct commit *origin = NULL, *head = NULL;

@@ -1317,11 +1328,6 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	 */
 	rev.show_root_diff = 1;
 
-	if (cover_letter) {
-		if (!branch_name)
-			branch_name = find_branch_name(&rev);
-	}
-
 	if (ignore_if_in_upstream) {
 		/* Don't say anything if head and upstream are the same. */
 		if (rev.pending.nr == 2) {

@@ -1360,6 +1366,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		numbered = 1;
 	if (numbered)
 		rev.total = total + start_number - 1;
+	if (cover_letter == -1)
+		cover_letter = (total > 1);
 	if (in_reply_to || thread || cover_letter)
 		rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
 	if (in_reply_to) {

@@ -1371,6 +1379,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	if (cover_letter) {
 		if (thread)
 			gen_message_id(&rev, "cover");
+		if (!branch_name)
+			branch_name = find_branch_name(&rev);
 		make_cover_letter(&rev, use_stdout,
 				  origin, nr, list, head, branch_name, quiet);
 		total++;