feat: mp_tree macro

base/mp_tree.sas

@@ -0,0 +1,68 @@
+/**
+  @file
+  @brief Recursively scans a directory tree to get all subfolders and content
+  @details
+  Usage:
+
+      %mp_tree(dir=/tmp, outds=work.tree)
+
+  Credits:
+
+  * Roger Deangelis, https://communities.sas.com/t5/SAS-Programming/listing-all-files-within-a-directory-and-subdirectories/m-p/332616/highlight/true#M74887
+  * Tom, https://communities.sas.com/t5/SAS-Programming/listing-all-files-of-all-types-from-all-subdirectories/m-p/334113/highlight/true#M75419
+
+
+  @param dir= Directory to be scanned (default=/tmp)
+  @param outds= Dataset to create (default=work.mp_tree)
+
+  @returns outds contains the following variables:
+
+   - `dir`: a flag (1/0) to say whether it is a directory or not.  This is not
+     reliable - folders that you do not have permission to open will be flagged
+     as directories.
+   - `ext`: file extension
+   - `filename`: file name
+   - `dirname`: directory name
+   - `fullpath`: directory + file name
+
+  @version 9.2
+**/
+
+%macro mp_tree(dir=/tmp
+  ,outds=work.mp_tree
+)/*/STORE SOURCE*/;
+
+data &outds ;
+  length dir 8 ext filename dirname $256 fullpath $512 ;
+  call missing(of _all_);
+  fullpath = "&dir";
+run;
+
+%local sep;
+%if &sysscp=WIN or &SYSSCP eq DNTHOST %then %let sep=\;
+%else %let sep=/;
+
+data &outds ;
+  modify &outds ;
+  retain sep "&sep";
+  rc=filename('tmp',fullpath);
+  dir_id=dopen('tmp');
+  dir = (dir_id ne 0) ;
+  if dir then dirname=fullpath;
+  else do;
+    filename=scan(fullpath,-1,sep) ;
+    dirname =substrn(fullpath,1,length(fullpath)-length(filename));
+    if index(filename,'.')>1 then ext=scan(filename,-1,'.');
+  end;
+  replace;
+  if dir then do;
+    do i=1 to dnum(dir_id);
+      fullpath=cats(dirname,sep,dread(dir_id,i));
+      output;
+    end;
+    rc=dclose(dir_id);
+  end;
+  rc=filename('tmp');
+run;
+
+%mend;