Allow prioritization of downloads based on name (fixes #174)

files/sort.go

@@ -0,0 +1,34 @@
+package files
+
+import (
+	"sort"
+
+	"github.com/calmh/syncthing/scanner"
+)
+
+type SortBy func(p scanner.File) int
+
+func (by SortBy) Sort(files []scanner.File) {
+	ps := &fileSorter{
+		files: files,
+		by:    by,
+	}
+	sort.Sort(ps)
+}
+
+type fileSorter struct {
+	files []scanner.File
+	by    func(p1 scanner.File) int
+}
+
+func (s *fileSorter) Len() int {
+	return len(s.files)
+}
+
+func (s *fileSorter) Swap(i, j int) {
+	s.files[i], s.files[j] = s.files[j], s.files[i]
+}
+
+func (s *fileSorter) Less(i, j int) bool {
+	return s.by(s.files[i]) > s.by(s.files[j])
+}