feat(*): recreate library as scoped package

base/mf_existfeature.sas

@@ -0,0 +1,42 @@
+/**
+  @file mf_existfeature.sas
+  @brief Checks whether a feature exists
+  @details Check to see if a feature is supported in your environment.
+    Run without arguments to see a list of detectable features.
+    Note - this list is based on known versions of SAS rather than
+    actual feature detection, as that is tricky / impossible to do
+    without generating errors in most cases.
+
+      %put %mf_existfeature(PROCLUA);
+
+  @param feature the feature to detect.  Leave blank to list all in log.
+  
+  @return output returns 1 or 0 (or -1 if not found)
+
+  <h4> Dependencies </h4>
+  @li mf_getplatform.sas
+
+
+  @version 8
+  @author Allan Bowe
+**/
+
+%macro mf_existfeature(feature
+)/*/STORE SOURCE*/;
+  %let feature=%upcase(&feature);
+  %local platform;
+  %let platform=%mf_getplatform();
+
+  %if &feature= %then %do;
+    %put Supported features:  PROCLUA;
+  %end;
+  %else %if &feature=PROCLUA %then %do;
+    %if &platform=SASVIYA %then 1;
+    %else %if "&sysver"="9.3" or "&sysver"="9.4" %then 1;
+    %else 0;
+  %end;
+  %else %do;
+    -1
+    %put &sysmacroname: &feature not found;
+  %end;
+%mend;