log --pretty/--oneline: ignore log.decorate

Many scripts, most notably gitk, rely on output from the log family of
command not to be molested by random user configuration.  This is
especially true when --pretty=raw is given.

Just like we disable notes output unless the command line explicitly
asks for --show-notes, disable the decoration code unless --decorate is
given explicitly from the command line and --pretty or --oneline is
given.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-log.c

@@ -53,6 +53,7 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 		      struct rev_info *rev)
 {
 	int i;
+	int decoration_given = 0;
 
 	rev->abbrev = DEFAULT_ABBREV;
 	rev->commit_format = CMIT_FMT_DEFAULT;
@@ -89,11 +90,13 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 		const char *arg = argv[i];
 		if (!strcmp(arg, "--decorate")) {
 			decoration_style = DECORATE_SHORT_REFS;
+			decoration_given = 1;
 		} else if (!prefixcmp(arg, "--decorate=")) {
 			const char *v = skip_prefix(arg, "--decorate=");
 			decoration_style = parse_decoration_style(arg, v);
 			if (decoration_style < 0)
 				die("invalid --decorate option: %s", arg);
+			decoration_given = 1;
 		} else if (!strcmp(arg, "--no-decorate")) {
 			decoration_style = 0;
 		} else if (!strcmp(arg, "--source")) {
@@ -103,6 +106,14 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 		} else
 			die("unrecognized argument: %s", arg);
 	}
+
+	/*
+	 * defeat log.decorate configuration interacting with --pretty
+	 * from the command line.
+	 */
+	if (!decoration_given && rev->pretty_given)
+		decoration_style = 0;
+
 	if (decoration_style) {
 		rev->show_decorations = 1;
 		load_ref_decorations(decoration_style);

t/t4202-log.sh

@@ -390,50 +390,62 @@ test_expect_success 'log --graph with merge' '
 test_expect_success 'log.decorate configuration' '
 	git config --unset-all log.decorate || :
 
-	git log --oneline >expect.none &&
-	git log --oneline --decorate >expect.short &&
-	git log --oneline --decorate=full >expect.full &&
+	git log >expect.none &&
+	git log --decorate >expect.short &&
+	git log --decorate=full >expect.full &&
+	git log --oneline >expect.oneline &&
 
 	echo "[log] decorate" >>.git/config &&
-	git log --oneline >actual &&
+	git log >actual &&
 	test_cmp expect.short actual &&
+	git log --oneline >actual &&
+	test_cmp expect.oneline actual &&
 
 	git config --unset-all log.decorate &&
 	git config log.decorate true &&
-	git log --oneline >actual &&
+	git log >actual &&
 	test_cmp expect.short actual &&
-	git log --oneline --decorate=full >actual &&
+	git log --decorate=full >actual &&
 	test_cmp expect.full actual &&
-	git log --oneline --decorate=no >actual &&
+	git log --decorate=no >actual &&
 	test_cmp expect.none actual &&
+	git log --oneline >actual &&
+	test_cmp expect.oneline actual &&
 
 	git config --unset-all log.decorate &&
 	git config log.decorate no &&
-	git log --oneline >actual &&
+	git log >actual &&
 	test_cmp expect.none actual &&
-	git log --oneline --decorate >actual &&
+	git log --decorate >actual &&
 	test_cmp expect.short actual &&
-	git log --oneline --decorate=full >actual &&
+	git log --decorate=full >actual &&
 	test_cmp expect.full actual &&
+	git log --oneline >actual &&
+	test_cmp expect.oneline actual &&
 
 	git config --unset-all log.decorate &&
 	git config log.decorate short &&
-	git log --oneline >actual &&
+	git log >actual &&
 	test_cmp expect.short actual &&
-	git log --oneline --no-decorate >actual &&
+	git log --no-decorate >actual &&
 	test_cmp expect.none actual &&
-	git log --oneline --decorate=full >actual &&
+	git log --decorate=full >actual &&
 	test_cmp expect.full actual &&
+	git log --oneline >actual &&
+	test_cmp expect.oneline actual &&
 
 	git config --unset-all log.decorate &&
 	git config log.decorate full &&
-	git log --oneline >actual &&
+	git log >actual &&
 	test_cmp expect.full actual &&
-	git log --oneline --no-decorate >actual &&
+	git log --no-decorate >actual &&
 	test_cmp expect.none actual &&
-	git log --oneline --decorate >actual &&
+	git log --decorate >actual &&
 	test_cmp expect.short actual
+	git log --oneline >actual &&
+	test_cmp expect.oneline actual &&
 
+	:
 '
 
 test_done