[PATCHv6 3/4] Let core.attributesfile default to $XDG_CONFIG_HOME/git/attributes

@@ -500,7 +500,9 @@ core.attributesfile::
 	In addition to '.gitattributes' (per-directory) and
 	'.git/info/attributes', git looks into this file for attributes
 	(see linkgit:gitattributes[5]). Path expansions are made the same
-	way as for `core.excludesfile`.
+	way as for `core.excludesfile`. Its default value is
+	$XDG_CONFIG_HOME/git/attributes. If $XDG_CONFIG_HOME is either not
+	set or empty, $HOME/.config/git/attributes will be used.
 
 core.editor::
 	Commands such as `commit` and `tag` that lets you edit

@@ -75,6 +75,8 @@ repositories (i.e., attributes of interest to all users) should go into
 `.gitattributes` files. Attributes that should affect all repositories
 for a single user should be placed in a file specified by the
 `core.attributesfile` configuration option (see linkgit:git-config[1]).
+Its default value is $XDG_CONFIG_HOME/git/attributes. If $XDG_CONFIG_HOME
+is either not set or empty, $HOME/.config/git/attributes will be used.
 Attributes for all users on a system should be placed in the
 `$(prefix)/etc/gitattributes` file.
 

@@ -497,6 +497,7 @@ static int git_attr_system(void)
 static void bootstrap_attr_stack(void)
 {
 	struct attr_stack *elem;
+	char *xdg_attributes_file;
 
 	if (attr_stack)
 		return;

@@ -515,13 +516,15 @@ static void bootstrap_attr_stack(void)
 		}
 	}
 
-	if (git_attributes_file) {
-		elem = read_attr_from_file(git_attributes_file, 1);
-		if (elem) {
-			elem->origin = NULL;
-			elem->prev = attr_stack;
-			attr_stack = elem;
-		}
+	if (!git_attributes_file) {
+		home_config_paths(NULL, &xdg_attributes_file, "attributes");
+		git_attributes_file = xdg_attributes_file;
+	}
+	elem = read_attr_from_file(git_attributes_file, 1);
+	if (elem) {
+		elem->origin = NULL;
+		elem->prev = attr_stack;
+		attr_stack = elem;
 	}
 
 	if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {

@@ -107,4 +107,51 @@ test_expect_success 'Exclusion in a non-XDG global ignore file' '
 '
 
 
+test_expect_success 'Checking attributes in the XDG attributes file' '
+	test_when_finished "rm -rf git" &&
+	git init git &&
+	(
+		cd git &&
+		echo foo >f &&
+		git check-attr -a f >actual &&
+		test_line_count -eq 0 actual &&
+		echo "f attr_f" >"$HOME"/.config/git/attributes &&
+		echo "f: attr_f: set" >expected &&
+		git check-attr -a f >actual &&
+		test_cmp expected actual
+	)
+'
+
+
+test_expect_success 'Checking attributes in both XDG and local ignore files' '
+	test_when_finished "rm -rf git" &&
+	git init git &&
+	(
+		cd git &&
+		echo foo >f &&
+		echo "f attr_f" >"$HOME"/.config/git/attributes &&
+		echo "f -attr_f" >.gitattributes &&
+		echo "f: attr_f: unset" >expected &&
+		git check-attr -a f >actual &&
+		test_cmp expected actual
+	)
+'
+
+
+test_expect_success 'Checking attributes in a non-XDG global attributes file' '
+	test_when_finished "rm -rf git" &&
+	git init git &&
+	(
+		cd git &&
+		echo foo >f &&
+		echo "f attr_f" >"$HOME"/.config/git/attributes &&
+		echo "f attr_f=test" >"$HOME"/my_gitattributes &&
+		git config core.attributesfile "$HOME"/my_gitattributes &&
+		echo "f: attr_f: test" >expected &&
+		git check-attr -a f >actual &&
+		test_cmp expected actual
+	)
+'
+
+
 test_done