[PATCH] environment.c: introduce DECLARE_GIT_GETTER helper macro

[Alexander Kuleshov <kuleshovmail@gmail.com>]

The environment.c contans a couple of functions which are
consist from the following pattern:

        if (!env)
                setup_git_env();
        return env;

Let's move declaration of these functions to the DECLARE_GIT_GETTER
helper macro to prevent code duplication.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
---
 environment.c | 49 ++++++++++++++-----------------------------------
 1 file changed, 14 insertions(+), 35 deletions(-)

diff --git a/environment.c b/environment.c
index 6dec9d0..f10fc7a 100644
--- a/environment.c
+++ b/environment.c
@@ -126,6 +126,14 @@ const char * const local_repo_env[] = {
 	NULL
 };
 
+#define DECLARE_GIT_GETTER(type, name, env)	\
+	type name(void)				\
+	{					\
+		if (!env)			\
+			setup_git_env();	\
+		return env;			\
+	}
+
 static char *expand_namespace(const char *raw_namespace)
 {
 	struct strbuf buf = STRBUF_INIT;
@@ -197,25 +205,11 @@ int is_bare_repository(void)
 	return is_bare_repository_cfg && !get_git_work_tree();
 }
 
-const char *get_git_dir(void)
-{
-	if (!git_dir)
-		setup_git_env();
-	return git_dir;
-}
-
 const char *get_git_common_dir(void)
 {
 	return git_common_dir;
 }
 
-const char *get_git_namespace(void)
-{
-	if (!namespace)
-		setup_git_env();
-	return namespace;
-}
-
 const char *strip_namespace(const char *namespaced_ref)
 {
 	if (!starts_with(namespaced_ref, get_git_namespace()))
@@ -249,13 +243,6 @@ const char *get_git_work_tree(void)
 	return work_tree;
 }
 
-char *get_object_directory(void)
-{
-	if (!git_object_dir)
-		setup_git_env();
-	return git_object_dir;
-}
-
 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 {
 	int fd;
@@ -293,20 +280,6 @@ int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 	return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 }
 
-char *get_index_file(void)
-{
-	if (!git_index_file)
-		setup_git_env();
-	return git_index_file;
-}
-
-char *get_graft_file(void)
-{
-	if (!git_graft_file)
-		setup_git_env();
-	return git_graft_file;
-}
-
 int set_git_dir(const char *path)
 {
 	if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
@@ -325,3 +298,9 @@ const char *get_commit_output_encoding(void)
 {
 	return git_commit_encoding ? git_commit_encoding : "UTF-8";
 }
+
+DECLARE_GIT_GETTER(const char *, get_git_dir, git_dir)
+DECLARE_GIT_GETTER(const char *, get_git_namespace, namespace)
+DECLARE_GIT_GETTER(char *, get_object_directory, git_object_dir)
+DECLARE_GIT_GETTER(char *, get_index_file, git_index_file)
+DECLARE_GIT_GETTER(char *, get_graft_file, git_graft_file)
-- 
2.8.0.rc0.142.g64f2103.dirty