Merge branch 'pt/xdg-config-path'

Code clean-up for xdg configuration path support.

* pt/xdg-config-path:
  path.c: remove home_config_paths()
  git-config: replace use of home_config_paths()
  git-commit: replace use of home_config_paths()
  credential-store.c: replace home_config_paths() with xdg_config_home()
  dir.c: replace home_config_paths() with xdg_config_home()
  attr.c: replace home_config_paths() with xdg_config_home()
  path.c: implement xdg_config_home()

attr.c

@@ -493,7 +493,6 @@ static int git_attr_system(void)
 static void bootstrap_attr_stack(void)
 {
 	struct attr_stack *elem;
-	char *xdg_attributes_file;
 
 	if (attr_stack)
 		return;
@@ -512,10 +511,8 @@ static void bootstrap_attr_stack(void)
 		}
 	}
 
-	if (!git_attributes_file) {
-		home_config_paths(NULL, &xdg_attributes_file, "attributes");
-		git_attributes_file = xdg_attributes_file;
-	}
+	if (!git_attributes_file)
+		git_attributes_file = xdg_config_home("attributes");
 	if (git_attributes_file) {
 		elem = read_attr_from_file(git_attributes_file, 1);
 		if (elem) {

builtin/commit.c

@@ -1398,12 +1398,10 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 
 static const char *implicit_ident_advice(void)
 {
-	char *user_config = NULL;
-	char *xdg_config = NULL;
-	int config_exists;
+	char *user_config = expand_user_path("~/.gitconfig");
+	char *xdg_config = xdg_config_home("config");
+	int config_exists = file_exists(user_config) || file_exists(xdg_config);
 
-	home_config_paths(&user_config, &xdg_config, "config");
-	config_exists = file_exists(user_config) || file_exists(xdg_config);
 	free(user_config);
 	free(xdg_config);
 

builtin/config.c

@@ -488,10 +488,8 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	}
 
 	if (use_global_config) {
-		char *user_config = NULL;
-		char *xdg_config = NULL;
-
-		home_config_paths(&user_config, &xdg_config, "config");
+		char *user_config = expand_user_path("~/.gitconfig");
+		char *xdg_config = xdg_config_home("config");
 
 		if (!user_config)
 			/*

cache.h

@@ -851,7 +851,6 @@ enum scld_error safe_create_leading_directories(char *path);
 enum scld_error safe_create_leading_directories_const(const char *path);
 
 int mkdir_in_gitdir(const char *path);
-extern void home_config_paths(char **global, char **xdg, char *file);
 extern char *expand_user_path(const char *path);
 const char *enter_repo(const char *path, int strict);
 static inline int is_absolute_path(const char *path)
@@ -871,6 +870,13 @@ char *strip_path_suffix(const char *path, const char *suffix);
 int daemon_avoid_alias(const char *path);
 extern int is_ntfs_dotgit(const char *name);
 
+/**
+ * Return a newly allocated string with the evaluation of
+ * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise
+ * "$HOME/.config/git/$filename". Return NULL upon error.
+ */
+extern char *xdg_config_home(const char *filename);
+
 /* object replacement */
 #define LOOKUP_REPLACE_OBJECT 1
 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);

config.c

@@ -1187,10 +1187,8 @@ int git_config_system(void)
 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 {
 	int ret = 0, found = 0;
-	char *xdg_config = NULL;
-	char *user_config = NULL;
-
-	home_config_paths(&user_config, &xdg_config, "config");
+	char *xdg_config = xdg_config_home("config");
+	char *user_config = expand_user_path("~/.gitconfig");
 
 	if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
 		ret += git_config_from_file(fn, git_etc_gitconfig(),

credential-store.c

@@ -170,7 +170,7 @@ int main(int argc, char **argv)
 	} else {
 		if ((file = expand_user_path("~/.git-credentials")))
 			string_list_append_nodup(&fns, file);
-		home_config_paths(NULL, &file, "credentials");
+		file = xdg_config_home("credentials");
 		if (file)
 			string_list_append_nodup(&fns, file);
 	}

dir.c

@@ -1671,14 +1671,11 @@ int remove_dir_recursively(struct strbuf *path, int flag)
 void setup_standard_excludes(struct dir_struct *dir)
 {
 	const char *path;
-	char *xdg_path;
 
 	dir->exclude_per_dir = ".gitignore";
 	path = git_path("info/exclude");
-	if (!excludes_file) {
-		home_config_paths(NULL, &xdg_path, "ignore");
-		excludes_file = xdg_path;
-	}
+	if (!excludes_file)
+		excludes_file = xdg_config_home("ignore");
 	if (!access_or_warn(path, R_OK, 0))
 		add_excludes_from_file(dir, path);
 	if (excludes_file && !access_or_warn(excludes_file, R_OK, 0))

path.c

@@ -224,34 +224,6 @@ const char *mkpath(const char *fmt, ...)
 	return cleanup_path(pathname->buf);
 }
 
-void home_config_paths(char **global, char **xdg, char *file)
-{
-	char *xdg_home = getenv("XDG_CONFIG_HOME");
-	char *home = getenv("HOME");
-	char *to_free = NULL;
-
-	if (!home) {
-		if (global)
-			*global = NULL;
-	} else {
-		if (!xdg_home) {
-			to_free = mkpathdup("%s/.config", home);
-			xdg_home = to_free;
-		}
-		if (global)
-			*global = mkpathdup("%s/.gitconfig", home);
-	}
-
-	if (xdg) {
-		if (!xdg_home)
-			*xdg = NULL;
-		else
-			*xdg = mkpathdup("%s/git/%s", xdg_home, file);
-	}
-
-	free(to_free);
-}
-
 const char *git_path_submodule(const char *path, const char *fmt, ...)
 {
 	struct strbuf *buf = get_pathname();
@@ -931,3 +903,18 @@ int is_ntfs_dotgit(const char *name)
 			len = -1;
 		}
 }
+
+char *xdg_config_home(const char *filename)
+{
+	const char *home, *config_home;
+
+	assert(filename);
+	config_home = getenv("XDG_CONFIG_HOME");
+	if (config_home && *config_home)
+		return mkpathdup("%s/git/%s", config_home, filename);
+
+	home = getenv("HOME");
+	if (home)
+		return mkpathdup("%s/.config/git/%s", home, filename);
+	return NULL;
+}