[recipes] Add api to get cache dir

[Matthias Clasen <matthiasc src gnome org>]

commit 7916349a4cde37151c4ad3ff76ed01db73c8efe6
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Apr 5 21:44:08 2017 -0400

    Add api to get cache dir
    
    This avoid adding a gnome-recipes subdirectory in the flatpak
    case, where it is unnecessary.

 src/gr-utils.c |   16 ++++++++++++++++
 src/gr-utils.h |    1 +
 2 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-utils.c b/src/gr-utils.c
index 86c6872..e4b08b8 100644
--- a/src/gr-utils.c
+++ b/src/gr-utils.c
@@ -125,6 +125,22 @@ get_user_data_dir (void)
 }
 
 const char *
+get_user_cache_dir (void)
+{
+        static char *dir = NULL;
+
+        if (!dir) {
+                if (in_flatpak_sandbox ())
+                        dir = g_strdup (g_get_user_cache_dir ());
+                else
+                        dir = g_build_filename (g_get_user_cache_dir (), PACKAGE_NAME, NULL);
+                g_mkdir_with_parents (dir, S_IRWXU | S_IRWXG | S_IRWXO);
+        }
+
+        return (const char *)dir;
+}
+
+const char *
 get_pkg_data_dir (void)
 {
         static char *dir = NULL;
diff --git a/src/gr-utils.h b/src/gr-utils.h
index 1214238..3a8c79a 100644
--- a/src/gr-utils.h
+++ b/src/gr-utils.h
@@ -38,6 +38,7 @@ void pixbuf_blur (GdkPixbuf *src,
 
 const char *get_pkg_data_dir  (void);
 const char *get_user_data_dir (void);
+const char *get_user_cache_dir (void);
 
 void    container_remove_all (GtkContainer *container);