1 files changed, 8 insertions, 0 deletions
diff --git a/src/sds.h b/src/sds.h
index 3a9e4cefe..85dc0b680 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -253,6 +253,14 @@ sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen);
 sds sdsjoin(char **argv, int argc, char *sep);
 sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen);
 
+/* Callback for sdstemplate. The function gets called by sdstemplate
+ * every time a variable needs to be expanded. The variable name is
+ * provided as variable, and the callback is expected to return a
+ * substitution value. Returning a NULL indicates an error.
+ */
+typedef sds (*sdstemplate_callback_t)(const sds variable, void *arg);
+sds sdstemplate(const char *template, sdstemplate_callback_t cb_func, void *cb_arg);
+
 /* Low level functions exposed to the user API */
 sds sdsMakeRoomFor(sds s, size_t addlen);
 void sdsIncrLen(sds s, ssize_t incr);