log: really flip the --mailmap default

Update the docs, test the interaction between the new default,
configuration and command line option, in addition to actually
flipping the default.

Signed-off-by: Jonathan Nieder <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

Documentation/config/log.txt

@@ -41,4 +41,4 @@ log.showSignature::
 log.mailmap::
 	If true, makes linkgit:git-log[1], linkgit:git-show[1], and
 	linkgit:git-whatchanged[1] assume `--use-mailmap`, otherwise
-	assume `--no-use-mailmap`. False by default.
+	assume `--no-use-mailmap`. True by default.

builtin/log.c

@@ -47,7 +47,7 @@ static int default_follow;
 static int default_show_signature;
 static int decoration_style;
 static int decoration_given;
-static int use_mailmap_config = -1;
+static int use_mailmap_config = 1;
 static const char *fmt_patch_subject_prefix = "PATCH";
 static const char *fmt_pretty;
 
@@ -160,7 +160,7 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 			 struct rev_info *rev, struct setup_revision_opt *opt)
 {
 	struct userformat_want w;
-	int quiet = 0, source = 0, mailmap = 0;
+	int quiet = 0, source = 0, mailmap;
 	static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
 	static struct string_list decorate_refs_exclude = STRING_LIST_INIT_NODUP;
 	static struct string_list decorate_refs_include = STRING_LIST_INIT_NODUP;
@@ -204,9 +204,6 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 	memset(&w, 0, sizeof(w));
 	userformat_find_requirements(NULL, &w);
 
-	if (mailmap < 0)
-		mailmap = 0;
-
 	if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
 		rev->show_notes = 1;
 	if (rev->show_notes)

t/t4203-mailmap.sh

@@ -442,6 +442,34 @@ test_expect_success 'Log output with log.mailmap' '
 	test_cmp expect actual
 '
 
+test_expect_success 'log.mailmap=false disables mailmap' '
+	cat >expect <<-\EOF &&
+	Author: CTO <[email protected]>
+	Author: claus <[email protected]>
+	Author: santa <[email protected]>
+	Author: nick2 <[email protected]>
+	Author: nick2 <[email protected]>
+	Author: nick1 <[email protected]>
+	Author: A U Thor <[email protected]>
+	EOF
+	git -c log.mailmap=False log | grep Author > actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-use-mailmap disables mailmap' '
+	cat >expect <<-\EOF &&
+	Author: CTO <[email protected]>
+	Author: claus <[email protected]>
+	Author: santa <[email protected]>
+	Author: nick2 <[email protected]>
+	Author: nick2 <[email protected]>
+	Author: nick1 <[email protected]>
+	Author: A U Thor <[email protected]>
+	EOF
+	git log --no-use-mailmap | grep Author > actual &&
+	test_cmp expect actual
+'
+
 cat >expect <<\EOF
 Author: Santa Claus <[email protected]>
 Author: Santa Claus <[email protected]>
@@ -461,6 +489,11 @@ test_expect_success 'Grep author with log.mailmap' '
 	test_cmp expect actual
 '
 
+test_expect_success 'log.mailmap is true by default these days' '
+	git log --author Santa | grep Author >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'Only grep replaced author with --use-mailmap' '
 	git log --use-mailmap --author "<[email protected]>" >actual &&
 	test_must_be_empty actual