reverse mode: support wildcard exclude (--exclude-wildcard)

This adds support for gitignore-like wildcards and exclude patters in
reverse mode. It (somewhat) fixes #273: no regexp support, but the
syntax should be powerful enough to satisfy most needs.

Also, since adding a lot of --exclude options can be tedious, it adds
the --exclude-from option to read patterns from a file (or files).

1 files changed, 21 insertions, 0 deletions

diff --git a/internal/nametransform/names.go b/internal/nametransform/names.go
index 20fbede..d5c2c8b 100644
--- a/internal/nametransform/names.go
+++ b/internal/nametransform/names.go
@@ -17,6 +17,17 @@ const (
 	NameMax = 255
 )
 
+// NameTransformer is an interface used to transform filenames.
+type NameTransformer interface {
+	DecryptName(cipherName string, iv []byte) (string, error)
+	EncryptName(plainName string, iv []byte) string
+	EncryptAndHashName(name string, iv []byte) (string, error)
+	HashLongName(name string) string
+	WriteLongNameAt(dirfd int, hashName string, plainName string) error
+	B64EncodeToString(src []byte) string
+	B64DecodeString(s string) ([]byte, error)
+}
+
 // NameTransform is used to transform filenames.
 type NameTransform struct {
 	emeCipher *eme.EMECipher
@@ -88,3 +99,13 @@ func (n *NameTransform) EncryptName(plainName string, iv []byte) (cipherName64 s
 	cipherName64 = n.B64.EncodeToString(bin)
 	return cipherName64
 }
+
+// B64EncodeToString returns a Base64-encoded string
+func (n *NameTransform) B64EncodeToString(src []byte) string {
+	return n.B64.EncodeToString(src)
+}
+
+// B64DecodeString decodes a Base64-encoded string
+func (n *NameTransform) B64DecodeString(s string) ([]byte, error) {
+	return n.B64.DecodeString(s)
+}