🚚 Move Slug/Hash Generators to own file

generators.go

@@ -1,15 +1,9 @@
 package nomino
 
 import (
-	"crypto/md5"
-	"crypto/sha1"
-	"crypto/sha256"
 	"errors"
-	"fmt"
-	"hash"
 
 	"github.com/google/uuid"
-	"github.com/gosimple/slug"
 )
 
 // Generator is a function that returns the "random" portion of the returned filename.
@@ -62,74 +56,3 @@ func uuidGen(*Config) (string, error) {
 func UUID() Generator {
 	return uuidGen
 }
-
-// ErrMissingOriginal is the error returned by Slug if there is no filename
-var ErrMissingOriginal = errors.New("missing original filename")
-
-func getOriginal(c *Config) (string, error) {
-	if c.original == "" {
-		return "", ErrMissingOriginal
-	}
-	name := c.original
-	c.original = ""
-	return name, nil
-}
-
-// Slug generates a name from the original filename.
-// When this is used, the original filename will be removed from the final filename.
-func Slug() Generator {
-	return func(c *Config) (string, error) {
-		name, err := getOriginal(c)
-		return slug.Make(name), err
-	}
-}
-
-// SlugWithLang generates a name from the original filename, accounting for the given language.
-// When this is used, the original filename will be removed from the final filename.
-func SlugWithLang(lang string) Generator {
-	return func(c *Config) (string, error) {
-		name, err := getOriginal(c)
-		return slug.MakeLang(name, lang), err
-	}
-}
-
-// HashingFunc is a function that generates a hash.Hash
-type HashingFunc func() hash.Hash
-
-//go:generate stringer -type=HashType
-
-// HashType represents a particular hashing algorithm
-type HashType uint8
-
-const (
-	MD5 HashType = iota + 1
-	SHA1
-	SHA256
-)
-
-// ErrInvalidHashType is returned by the Hash generator when an invalid HashType is passed
-var ErrInvalidHashType = errors.New("invalid hash type")
-
-var hashMap = map[HashType]HashingFunc{
-	MD5:    md5.New,
-	SHA1:   sha1.New,
-	SHA256: sha256.New,
-}
-
-// Hash generates a name from a hash of the filename.
-// When this is used, the original filename will be removed from the final filename.
-func Hash(t HashType) Generator {
-	f, ok := hashMap[t]
-	return func(c *Config) (string, error) {
-		if !ok {
-			return "", fmt.Errorf("%w: %s", ErrInvalidHashType, t)
-		}
-		name, err := getOriginal(c)
-		if err != nil {
-			return "", err
-		}
-		hs := f()
-		hs.Write([]byte(name))
-		return fmt.Sprintf("%x", hs.Sum(nil)), nil
-	}
-}