feat: new mfv_getfolderpath macro

+ associated test
created to support the fix for https://git.datacontroller.io/dc/dc/issues/171

viya/mfv_getfolderpath.sas

@@ -0,0 +1,53 @@
+/**
+  @file
+  @brief Returns the path of a folder from the URI
+  @details Makes use of the SYSMSG() ER8OR response, which resolves the uri,
+  seemingly without entering an er8or state.
+
+  Usage:
+
+      %mv_createfolder(path=/public/demo)
+      %let uri=%mfv_getpathuri(/public/demo);
+      %put %mfv_getfolderpath(&uri);
+
+  Notice above the new path has an uppercase P - the correct path.
+
+  @param [in] uri The uri of the folder -eg /folders/folders/xxxx)
+
+  <h4> SAS Macros </h4>
+  @li mf_getuniquefileref.sas
+
+  <h4> Related Macros </h4>
+  @li mfv_getpathuri.sas
+
+  @version 4
+  @author [Allan Bowe](https://www.linkedin.com/in/allanbowe/)
+**/
+%macro mfv_getfolderpath(uri
+)/*/STORE SOURCE*/;
+
+  %local fref rc path msg var /* var used to avoid delete timing issue */;
+  %let fref=%mf_getuniquefileref();
+  %if %quote(%substr(%str(&uri),1,17)) ne %quote(/folders/folders/)
+  %then %do;
+    %put &sysmacroname: Invalid URI: &uri;
+  %end;
+  %else %if %sysfunc(filename(fref,,filesrvc,folderuri="&uri" ))=0
+  %then %do;
+    %let var=_FILESRVC_&fref._URI;
+    %local fid ;
+    %let fid= %sysfunc(fopen(&fref,I));
+    %let msg=%quote(%sysfunc(sysmsg()));
+
+    %unquote(%scan(&msg,2,%str(,.)))
+
+    %let rc=%sysfunc(fclose(&fid));
+    %let rc=%sysfunc(filename(fref));
+    %symdel &var;
+  %end;
+  %else %do;
+    %put &sysmacroname: Not Found: &uri;
+    %let syscc=0;
+  %end;
+
+%mend mfv_getfolderpath ;