format-patch: Default to --from

@@ -1261,7 +1261,7 @@ format.from::
 	`--from`, using your committer identity in the "From:" field of patch
 	mails and including a "From:" field in the body of the patch mail if
 	different.  If set to a non-boolean value, format-patch uses that
-	value instead of your committer identity.  Defaults to false.
+	value instead of your committer identity.  Defaults to true.
 
 format.numbered::
 	A boolean which can enable or disable sequence numbers in patch

@@ -1486,6 +1486,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
+	set_from(FROM_USER, NULL);
 	extra_hdr.strdup_strings = 1;
 	extra_to.strdup_strings = 1;
 	extra_cc.strdup_strings = 1;

@@ -652,7 +652,7 @@ EOF
 
 test_expect_success 'format-patch -p suppresses stat' '
 
-	git format-patch -p -2 &&
+	git format-patch --no-from -p -2 &&
 	sed -e "1,/^\$/d" -e "/^+5/q" < 0001-This-is-an-excessively-long-subject-line-for-a-messa.patch > output &&
 	test_cmp expect output
 

@@ -973,7 +973,7 @@ check_author() {
 	echo content >>file &&
 	git add file &&
 	GIT_AUTHOR_NAME=$1 git commit -m author-check &&
-	git format-patch --stdout -1 >patch &&
+	git format-patch --no-from --stdout -1 >patch &&
 	sed -n "/^From: /p; /^ /p; /^$/q" <patch >actual &&
 	test_cmp expect actual
 }

@@ -1089,6 +1089,18 @@ test_expect_success '--from=ident replaces author' '
 	test_cmp expect patch.head
 '
 
+test_expect_success 'Default uses committer ident' '
+	git format-patch -1 --stdout >patch &&
+	cat >expect <<-\EOF &&
+	From: C O Mitter <committer@example.com>
+
+	From: A U Thor <author@example.com>
+
+	EOF
+	sed -ne "/^From:/p; /^$/p; /^---$/q" <patch >patch.head &&
+	test_cmp expect patch.head
+'
+
 test_expect_success '--from uses committer ident' '
 	git format-patch -1 --stdout --from >patch &&
 	cat >expect <<-\EOF &&

@@ -1101,6 +1113,16 @@ test_expect_success '--from uses committer ident' '
 	test_cmp expect patch.head
 '
 
+test_expect_success '--no-from suppresses default --from' '
+	git format-patch -1 --stdout --no-from >patch &&
+	cat >expect <<-\EOF &&
+	From: A U Thor <author@example.com>
+
+	EOF
+	sed -ne "/^From:/p; /^$/p; /^---$/q" <patch >patch.head &&
+	test_cmp expect patch.head
+'
+
 test_expect_success '--from omits redundant in-body header' '
 	git format-patch -1 --stdout --from="A U Thor <author@example.com>" >patch &&
 	cat >expect <<-\EOF &&

@@ -1129,7 +1151,7 @@ test_expect_success 'in-body headers trigger content encoding' '
 append_signoff()
 {
 	C=$(git commit-tree HEAD^^{tree} -p HEAD) &&
-	git format-patch --stdout --signoff $C^..$C >append_signoff.patch &&
+	git format-patch --no-from --stdout --signoff $C^..$C >append_signoff.patch &&
 	sed -n -e "1,/^---$/p" append_signoff.patch |
 		egrep -n "^Subject|Sign|^$"
 }