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/**
  @file mm_createdataset.sas
  @brief Create a dataset from a metadata definition
  @details This macro was built to support viewing empty tables in
    https://datacontroller.io - a free evaluation copy is available by
    contacting the author (Allan Bowe).
 
    The table can be retrieved using LIBRARY.DATASET reference, or directly
    using the metadata URI.
 
    The dataset is written to the WORK library.
 
  usage:
 
    %mm_createdataset(libds=metlib.some_dataset)
 
    or
 
    %mm_createdataset(tableuri=G5X8AFW1.BE00015Y)
 
  <h4> Dependencies </h4>
  @li mm_getlibs.sas
  @li mm_gettables.sas
  @li mm_getcols.sas
 
  @param libds= library.dataset metadata source.  Note - table names in metadata
    can be longer than 32 chars (just fyi, not an issue here)
  @param tableuri= Metadata URI of the table to be created
  @param outds= The dataset to create, default is `work.mm_createdataset`.
    The table name needs to be 32 chars or less as per SAS naming rules.
  @param mdebug= set DBG to 1 to disable DEBUG messages
 
  @version 9.4
  @author Allan Bowe
 
**/
 
%macro mm_createdataset(libds=,tableuri=,outds=work.mm_createdataset,mDebug=0);
%local dbg errorcheck tempds1 tempds2 tempds3;
%if &mDebug=0 %then %let dbg=*;
%let errorcheck=1;
 
%if %index(&libds,.)>0 %then %do;
  /* get lib uri */
  data;run;%let tempds1=&syslast;
  %mm_getlibs(outds=&tempds1)
  data _null_;
    set &tempds1;
    if upcase(libraryref)="%upcase(%scan(&libds,1,.))";
    call symputx('liburi',LibraryId,'l');
  run;
  /* get ds uri */
  data;run;%let tempds2=&syslast;
  %mm_gettables(uri=&liburi,outds=&tempds2)
  data _null_;
    set &tempds2;
    if upcase(tablename)="%upcase(%scan(&libds,2,.))";
    call symputx('tableuri',tableuri);
  run;
%end;
 
data;run;%let tempds3=&syslast;
%mm_getcols(tableuri=&tableuri,outds=&tempds3)
 
data _null_;
  set &tempds3 end=last;
  if _n_=1 then call execute('data &outds;');
  length attrib $32767;
 
  if SAScolumntype='C' then type='$';
  attrib='attrib '!!cats(colname)!!' length='!!cats(type,SASColumnLength,'.');
 
  if not missing(sasformat) then fmt=' format='!!cats(sasformat);
  if not missing(sasinformat) then infmt=' informat='!!cats(sasinformat);
  if not missing(coldesc) then desc=' label='!!quote(cats(coldesc));
 
  attrib=trim(attrib)!!fmt!!infmt!!desc!!';';
 
  call execute(attrib);
  if last then call execute('call missing(of _all_);stop;run;');
run;
 
%mend;