KeepForeverFALSE__ALLLLL -- for https://script.google.com/ and gDrive file revision "KeepForever" modification

gistfile1.txt

function setRevisionPurge() {

  //var search = '(title contains .BBL) or (title contains .bbl)';
  var files  = DriveApp.getFiles();  //DriveApp.searchFiles(search);

  while (files.hasNext()) {

    var file = files.next();    
    var fileName = file.getName();
    var fileId = file.getId();

    try {
      var revisions = Drive.Revisions.list(fileId).items;
      console.log('fileName '+fileName+' fileID '+fileId);
      // no need to unset revision 0 because it's the "current"; therefore, for i = 1 to max
      for (var i = 1 ; i < revisions.length ; i ++) {         
        console.log('      revisions['+i+'] '+revisions[i].id+' dated: '+revisions[i].getModifiedDate()+' -- keep was: '+revisions[i].pinned);    
        if (revisions[i].pinned) {
          var rclone = revisions[i];
          rclone.pinned = false;
          console.log('      LETS NOT KEEP '+'revision['+i+']'+' of '+fileName);
          var request = Drive.Revisions.update(rclone, fileId, revisions[i].id);   
        } 
      }
    } catch (e) {
      Logger.log(e.message);
    }
  }  
}

NOTE: if the file revision is already past 30 days, i presume it will almost immediately purge, but i have not tested, run with caution.

Thanks to these resources:
https://script.google.com/
https://stackoverflow.com/questions/46082828/how-can-i-use-a-google-script-to-keep-revision-history-in-google-drive-for-files
https://developers.google.com/drive/api/v2/reference/revisions
https://developers.google.com/apps-script/reference/drive/drive-app
https://developers.google.com/drive/api/v2/ref-search-terms?hl=en