Conditionally sort image catalog. Correct small typos.

1 files changed, 23 insertions, 0 deletions

diff --git a/compare.go b/compare.go
index 3fd7eaf..64cad1f 100644
--- a/compare.go
+++ b/compare.go
@@ -21,8 +21,31 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"sort"
 )
 
+type sortType struct {
+	length int
+	less   func(int, int) bool
+	swap   func(int, int)
+}
+
+func (s *sortType) Len() int {
+	return s.length
+}
+
+func (s *sortType) Less(i, j int) bool {
+	return s.less(i, j)
+}
+
+func (s *sortType) Swap(i, j int) {
+	s.swap(i, j)
+}
+
+func gensort(Len int, Less func(int, int) bool, Swap func(int, int)) {
+	sort.Sort(&sortType{length: Len, less: Less, swap: Swap})
+}
+
 func writeBytes(leadStr string, startPos int, sl []byte) {
 	var pos, max int
 	var b byte