builtin-log: respect diff configuration options

The log commands are all capable of generating diffs, so we
should respect those configuration options for diffs here.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-log.c

@@ -47,6 +47,7 @@ int cmd_whatchanged(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
+	git_config(git_diff_config);
 	init_revisions(&rev);
 	rev.diff = 1;
 	rev.diffopt.recursive = 1;
@@ -61,6 +62,7 @@ int cmd_show(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
+	git_config(git_diff_config);
 	init_revisions(&rev);
 	rev.diff = 1;
 	rev.diffopt.recursive = 1;
@@ -77,6 +79,7 @@ int cmd_log(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
+	git_config(git_diff_config);
 	init_revisions(&rev);
 	rev.always_show_header = 1;
 	cmd_log_init(argc, argv, envp, &rev);
@@ -102,7 +105,7 @@ static int git_format_config(const char *var, const char *value)
 		strcat(extra_headers, value);
 		return 0;
 	}
-	return git_default_config(var, value);
+	return git_diff_config(var, value);
 }
 
 
@@ -234,6 +237,7 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
 	struct diff_options patch_id_opts;
 	char *add_signoff = NULL;
 
+	git_config(git_format_config);
 	init_revisions(&rev);
 	rev.commit_format = CMIT_FMT_EMAIL;
 	rev.verbose_header = 1;
@@ -243,7 +247,6 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
 	rev.diffopt.msg_sep = "";
 	rev.diffopt.recursive = 1;
 
-	git_config(git_format_config);
 	rev.extra_headers = extra_headers;
 
 	/*