func keywordsToSet(img *model.Image, file_kwds []string,
oldex map[string][]string) ([]string, bool) {
// log.Printf("%s file: %s\n", img.Name(), strings.Join(file_kwds, ", "))
// log.Printf("%s db : %s\n", img.Name(), strings.Join(img.Keywords(), ", "))
present := make(map[string]bool)
var kwds []string
var k string
for _, k = range img.Keywords() {
kwds = appendIfNew(kwds, k, present)
}
for _, k = range file_kwds {
kwds = appendIfNew(kwds, k, present)
}
old_kwds, has_old := oldex[img.Name()]
if has_old {
for _, k = range old_kwds {
kwds = appendIfNew(kwds, k, present)
}
}
return kwds, len(kwds) != len(file_kwds)
}
