Add the possibility to look for patterns allowing indels.

Former-commit-id: 0599c2b0ad16df086dbdb08e491503870d8904be

pkg/obiseq/compare.go

@@ -0,0 +1,46 @@
+package obiseq
+
+import (
+	"bytes"
+)
+
+type Compare func(a, b *BioSequence) int
+
+func CompareSequence(a, b *BioSequence) int {
+	return bytes.Compare(a.sequence, b.sequence)
+}
+
+func CompareQuality(a, b *BioSequence) int {
+	return bytes.Compare(a.qualities, b.qualities)
+}
+
+// func CompareAttributeBuillder(key string) Compare {
+// 	f := func(a, b *BioSequence) int {
+// 		ak, oka := a.GetAttribute(key)
+// 		bk, okb := b.GetAttribute(key)
+
+// 		switch {
+// 		case !oka && !okb:
+// 			return 0
+// 		case !oka:
+// 			return -1
+// 		case !okb:
+// 			return +1
+// 		}
+
+// 		//av,oka := ak.(constraints.Ordered)
+// 		//bv,okb := bk.(constraints.Ordered)
+
+// 		switch {
+// 		case !oka && !okb:
+// 			return 0
+// 		case !oka:
+// 			return -1
+// 		case !okb:
+// 			return +1
+// 		}
+
+// 	}
+
+// 	return f
+// }