// Bag will fetch a random line from file and return it.
// args[0] - filename.
func Bag(scope common.Scope, args ...interface{}) interface{} {
var err error
filename := args[0].(string)
if !filepath.IsAbs(filename) {
if bagdir, _, ok := scope.GetString("_bagdir"); ok {
filename = filepath.Join(bagdir, filename)
} else if prodfile, _, ok := scope.GetString("_prodfile"); ok {
dirpath := filepath.Dir(prodfile)
filename = filepath.Join(dirpath, filename)
}
}
if filename, err = filepath.Abs(filename); err != nil {
panic(fmt.Errorf("bad filepath: %v\n", filename))
}
bagrw.RLock()
records, ok := cacheBagRecords[filename]
bagrw.RUnlock()
if !ok {
records = readBag(filename)
bagrw.Lock()
cacheBagRecords[filename] = records
bagrw.Unlock()
}
if len(records) > 0 {
rnd := scope.GetRandom()
record := records[rnd.Intn(len(records))]
if len(record) > 0 {
return record[0]
}
}
return ""
}
