Consolidate all hashing to the common/hashing package

And remove now unsued hashing funcs.

identity/identityhash.go

@@ -1,91 +0,0 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package identity
-
-import (
-	"strconv"
-	"sync"
-
-	"github.com/cespare/xxhash/v2"
-	"github.com/gohugoio/hashstructure"
-)
-
-// HashString returns a hash from the given elements.
-// It will panic if the hash cannot be calculated.
-// Note that this hash should be used primarily for identity, not for change detection as
-// it in the more complex values (e.g. Page) will not hash the full content.
-func HashString(vs ...any) string {
-	hash := HashUint64(vs...)
-	return strconv.FormatUint(hash, 10)
-}
-
-var hashOptsPool = sync.Pool{
-	New: func() any {
-		return &hashstructure.HashOptions{
-			Hasher: xxhash.New(),
-		}
-	},
-}
-
-func getHashOpts() *hashstructure.HashOptions {
-	return hashOptsPool.Get().(*hashstructure.HashOptions)
-}
-
-func putHashOpts(opts *hashstructure.HashOptions) {
-	opts.Hasher.Reset()
-	hashOptsPool.Put(opts)
-}
-
-// HashUint64 returns a hash from the given elements.
-// It will panic if the hash cannot be calculated.
-// Note that this hash should be used primarily for identity, not for change detection as
-// it in the more complex values (e.g. Page) will not hash the full content.
-func HashUint64(vs ...any) uint64 {
-	var o any
-	if len(vs) == 1 {
-		o = toHashable(vs[0])
-	} else {
-		elements := make([]any, len(vs))
-		for i, e := range vs {
-			elements[i] = toHashable(e)
-		}
-		o = elements
-	}
-
-	hashOpts := getHashOpts()
-	defer putHashOpts(hashOpts)
-
-	hash, err := hashstructure.Hash(o, hashOpts)
-	if err != nil {
-		panic(err)
-	}
-	return hash
-}
-
-type keyer interface {
-	Key() string
-}
-
-// For structs, hashstructure.Hash only works on the exported fields,
-// so rewrite the input slice for known identity types.
-func toHashable(v any) any {
-	switch t := v.(type) {
-	case keyer:
-		return t.Key()
-	case IdentityProvider:
-		return t.GetIdentity()
-	default:
-		return v
-	}
-}

identity/identityhash_test.go

@@ -1,68 +0,0 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package identity
-
-import (
-	"fmt"
-	"math"
-	"strings"
-	"testing"
-
-	qt "github.com/frankban/quicktest"
-)
-
-func TestHashString(t *testing.T) {
-	c := qt.New(t)
-
-	c.Assert(HashString("a", "b"), qt.Equals, "3176555414984061461")
-	c.Assert(HashString("ab"), qt.Equals, "7347350983217793633")
-
-	var vals []any = []any{"a", "b", tstKeyer{"c"}}
-
-	c.Assert(HashString(vals...), qt.Equals, "4438730547989914315")
-	c.Assert(vals[2], qt.Equals, tstKeyer{"c"})
-}
-
-type tstKeyer struct {
-	key string
-}
-
-func (t tstKeyer) Key() string {
-	return t.key
-}
-
-func (t tstKeyer) String() string {
-	return "key: " + t.key
-}
-
-func BenchmarkHashString(b *testing.B) {
-	word := " hello "
-
-	var tests []string
-
-	for i := 1; i <= 5; i++ {
-		sentence := strings.Repeat(word, int(math.Pow(4, float64(i))))
-		tests = append(tests, sentence)
-	}
-
-	b.ResetTimer()
-
-	for _, test := range tests {
-		b.Run(fmt.Sprintf("n%d", len(test)), func(b *testing.B) {
-			for i := 0; i < b.N; i++ {
-				HashString(test)
-			}
-		})
-	}
-}