[PATCH] environment.c: introduce SETUP_GIT_ENV 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 this to the SETUP_GIT_ENV helper macro to prevent
code duplication in these functions.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
---
 environment.c | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/environment.c b/environment.c
index 6dec9d0..04cb6cd 100644
--- a/environment.c
+++ b/environment.c
@@ -126,6 +126,11 @@ const char * const local_repo_env[] = {
 	NULL
 };
 
+#define SETUP_GIT_ENV(env)              \
+	if (!env)                       \
+		setup_git_env();        \
+	return env;
+
 static char *expand_namespace(const char *raw_namespace)
 {
 	struct strbuf buf = STRBUF_INIT;
@@ -199,9 +204,7 @@ int is_bare_repository(void)
 
 const char *get_git_dir(void)
 {
-	if (!git_dir)
-		setup_git_env();
-	return git_dir;
+	SETUP_GIT_ENV(git_dir);
 }
 
 const char *get_git_common_dir(void)
@@ -211,9 +214,7 @@ const char *get_git_common_dir(void)
 
 const char *get_git_namespace(void)
 {
-	if (!namespace)
-		setup_git_env();
-	return namespace;
+	SETUP_GIT_ENV(namespace);
 }
 
 const char *strip_namespace(const char *namespaced_ref)
@@ -251,9 +252,7 @@ const char *get_git_work_tree(void)
 
 char *get_object_directory(void)
 {
-	if (!git_object_dir)
-		setup_git_env();
-	return git_object_dir;
+	SETUP_GIT_ENV(git_object_dir);
 }
 
 int odb_mkstemp(char *template, size_t limit, const char *pattern)
@@ -295,16 +294,12 @@ int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 
 char *get_index_file(void)
 {
-	if (!git_index_file)
-		setup_git_env();
-	return git_index_file;
+	SETUP_GIT_ENV(git_index_file);
 }
 
 char *get_graft_file(void)
 {
-	if (!git_graft_file)
-		setup_git_env();
-	return git_graft_file;
+	SETUP_GIT_ENV(git_graft_file);
 }
 
 int set_git_dir(const char *path)
-- 
2.5.0