[RFC/PATCH 1/2] log: add "log.showsignature" configuration variable

[Mehul Jain <mehul.jain2029@gmail.com>]

People may want to always use "--show-signature" while using "git log"
or "git show".

When log.showsignature set true, "git log" and "git show" will behave
as "--show-signature" was given to them.

Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com>
---
 Documentation/git-log.txt |  4 ++++
 builtin/log.c             |  6 ++++++
 t/t4202-log.sh            | 19 +++++++++++++++++++
 t/t7510-signed-commit.sh  |  7 +++++++
 4 files changed, 36 insertions(+)

diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index 03f9580..f39f800 100644
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -196,6 +196,10 @@ log.showRoot::
 	`git log -p` output would be shown without a diff attached.
 	The default is `true`.
 
+log.showSignature::
+	If `true`, `git log` and `git show` will act as if `--show-signature`
+	option was passed to them.
+
 mailmap.*::
 	See linkgit:git-shortlog[1].
 
diff --git a/builtin/log.c b/builtin/log.c
index 099f4f7..7103217 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -33,6 +33,7 @@ static const char *default_date_mode = NULL;
 static int default_abbrev_commit;
 static int default_show_root = 1;
 static int default_follow;
+static int default_show_signature;
 static int decoration_style;
 static int decoration_given;
 static int use_mailmap_config;
@@ -119,6 +120,7 @@ static void cmd_log_init_defaults(struct rev_info *rev)
 	rev->abbrev_commit = default_abbrev_commit;
 	rev->show_root_diff = default_show_root;
 	rev->subject_prefix = fmt_patch_subject_prefix;
+	rev->show_signature = default_show_signature;
 	DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);
 
 	if (default_date_mode)
@@ -409,6 +411,10 @@ static int git_log_config(const char *var, const char *value, void *cb)
 		use_mailmap_config = git_config_bool(var, value);
 		return 0;
 	}
+	if (!strcmp(var, "log.showsignature")) {
+		default_show_signature = git_config_bool(var, value);
+		return 0;
+	}
 
 	if (grep_config(var, value, cb) < 0)
 		return -1;
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 128ba93..36be9a1 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -890,6 +890,25 @@ test_expect_success GPG 'log --graph --show-signature for merged tag' '
 	grep "^| | gpg: Good signature" actual
 '
 
+test_expect_success GPG 'log.showsignature=true behaves like --show-signature' '
+	git checkout -b test_sign master &&
+	echo foo >foo &&
+	git add foo &&
+	git commit -S -m signed_commit &&
+	test_config log.showsignature true &&
+	git log -1 signed >actual &&
+	test_i18ngrep "gpg: Signature made" actual &&
+	test_i18ngrep "gpg: Good signature" actual
+'
+
+test_expect_success GPG '--show-signature overrides log.showsignature=false' '
+	test_when_finished "git reset --hard && git checkout master" &&
+	git config log.showsignature false &&
+	git log -1 --show-signature signed >actual &&
+	test_i18ngrep "gpg: Signature made" actual &&
+	test_i18ngrep "gpg: Good signature" actual
+'
+
 test_expect_success 'log --graph --no-walk is forbidden' '
 	test_must_fail git log --graph --no-walk
 '
diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
index 4177a86..326dcc8 100755
--- a/t/t7510-signed-commit.sh
+++ b/t/t7510-signed-commit.sh
@@ -210,4 +210,11 @@ test_expect_success GPG 'show lack of signature with custom format' '
 	test_cmp expect actual
 '
 
+test_expect_success GPG 'log.showsignature behaves like --show-signature' '
+	git config log.showsignature true &&
+	git show initial > actual &&
+	test_i18ngrep "gpg: Signature made" actual &&
+	test_i18ngrep "gpg: Good signature" actual
+'
+
 test_done
-- 
2.9.0.rc0.dirty