feat: mf_isdir macro

all.sas

@@ -1152,6 +1152,38 @@ Usage:
 
   %sysevalf(%superq(param)=,boolean)
 
+%mend;/**
+  @file
+  @brief Checks whether a path is a valid directory
+  @details
+  Usage:
+
+      %let isdir=%mf_isdir(/tmp);
+
+  With thanks and full credit to Andrea Defronzo - https://www.linkedin.com/in/andrea-defronzo-b1a47460/
+
+  @param path full path of the file/directory to be checked
+
+  @return output returns 1 if path is a directory, 0 if it is not
+
+  @version 9.2
+**/
+
+%macro mf_isdir(path
+)/*/STORE SOURCE*/;
+	%local rc did is_directory fref_t;
+
+	%let is_directory = 0;
+	%let rc = %sysfunc(filename(fref_t, %superq(path)));
+	%let did = %sysfunc(dopen(&fref_t.));
+	%if &did. ^= 0 %then %do;
+	   %let is_directory = 1;
+	   %let rc = %sysfunc(dclose(&did.));
+	%end;
+	%let rc = %sysfunc(filename(fref_t));
+
+	&is_directory
+
 %mend;/**
   @file
   @brief Returns physical location of various SAS items