internal/pkg: wrap checksum string encoding

This wraps base64.URLEncoding.EncodeToString for cleaner call site.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/pkg.go

@@ -24,6 +24,16 @@ type (
 	ID Checksum
 )
 
+// Encode is abbreviation for base64.URLEncoding.EncodeToString(checksum[:]).
+func Encode(checksum Checksum) string {
+	return base64.URLEncoding.EncodeToString(checksum[:])
+}
+
+// encode is abbreviation for base64.URLEncoding.EncodeToString(checksum[:]).
+func encode(checksum *Checksum) string {
+	return base64.URLEncoding.EncodeToString(checksum[:])
+}
+
 // MustDecode decodes a string representation of [Checksum] and panics if there
 // is a decoding error or the resulting data is too short.
 func MustDecode(s string) (checksum Checksum) {
@@ -143,7 +153,7 @@ func (c *Cache) LoadFile(id ID) (
 ) {
 	pathname = c.base.Append(
 		dirIdentifier,
-		base64.URLEncoding.EncodeToString(id[:]),
+		Encode(id),
 	)
 
 	c.mu.RLock()
@@ -160,15 +170,15 @@ type ChecksumMismatchError struct {
 }
 
 func (e *ChecksumMismatchError) Error() string {
-	return "got " + base64.URLEncoding.EncodeToString(e.Got[:]) +
-		" instead of " + base64.URLEncoding.EncodeToString(e.Want[:])
+	return "got " + Encode(e.Got) +
+		" instead of " + Encode(e.Want)
 }
 
 // pathname returns the content-addressed pathname for a [Checksum].
 func (c *Cache) pathname(checksum *Checksum) *check.Absolute {
 	return c.base.Append(
 		dirChecksum,
-		base64.URLEncoding.EncodeToString(checksum[:]),
+		encode(checksum),
 	)
 }
 
@@ -176,7 +186,7 @@ func (c *Cache) pathname(checksum *Checksum) *check.Absolute {
 func (c *Cache) pathnameIdent(id *ID) *check.Absolute {
 	return c.base.Append(
 		dirIdentifier,
-		base64.URLEncoding.EncodeToString(id[:]),
+		encode((*Checksum)(id)),
 	)
 }