Improve issue & code search (#33860)

Each "indexer" should provide the "search modes" they support by
themselves. And we need to remove the "fuzzy" search for code.

modules/indexer/code/internal/indexer.go

@@ -9,6 +9,7 @@ import (
 
 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/indexer"
 	"code.gitea.io/gitea/modules/indexer/internal"
 )
 
@@ -18,6 +19,7 @@ type Indexer interface {
 	Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *RepoChanges) error
 	Delete(ctx context.Context, repoID int64) error
 	Search(ctx context.Context, opts *SearchOptions) (int64, []*SearchResult, []*SearchResultLanguages, error)
+	SupportedSearchModes() []indexer.SearchMode
 }
 
 type SearchOptions struct {
@@ -25,7 +27,7 @@ type SearchOptions struct {
 	Keyword  string
 	Language string
 
-	IsKeywordFuzzy bool
+	SearchMode indexer.SearchModeType
 
 	db.Paginator
 }
@@ -41,6 +43,10 @@ type dummyIndexer struct {
 	internal.Indexer
 }
 
+func (d *dummyIndexer) SupportedSearchModes() []indexer.SearchMode {
+	return nil
+}
+
 func (d *dummyIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *RepoChanges) error {
 	return fmt.Errorf("indexer is not ready")
 }

modules/indexer/code/internal/util.go

@@ -10,9 +10,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 )
 
-const (
-	filenameMatchNumberOfLines = 7 // Copied from github search
-)
+const filenameMatchNumberOfLines = 7 // Copied from GitHub search
 
 func FilenameIndexerID(repoID int64, filename string) string {
 	return internal.Base36(repoID) + "_" + filename
@@ -48,11 +46,3 @@ func FilenameMatchIndexPos(content string) (int, int) {
 	}
 	return 0, len(content)
 }
-
-func ParseKeywordAsPhrase(keyword string) (string, bool) {
-	if strings.HasPrefix(keyword, `"`) && strings.HasSuffix(keyword, `"`) && len(keyword) > 1 {
-		// only remove the prefix and suffix quotes, no need to decode the content at the moment
-		return keyword[1 : len(keyword)-1], true
-	}
-	return "", false
-}

modules/indexer/code/internal/util_test.go

@@ -1,30 +0,0 @@
-// Copyright 2025 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package internal
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestParseKeywordAsPhrase(t *testing.T) {
-	cases := []struct {
-		keyword  string
-		phrase   string
-		isPhrase bool
-	}{
-		{``, "", false},
-		{`a`, "", false},
-		{`"`, "", false},
-		{`"a`, "", false},
-		{`"a"`, "a", true},
-		{`""\"""`, `"\""`, true},
-	}
-	for _, c := range cases {
-		phrase, isPhrase := ParseKeywordAsPhrase(c.keyword)
-		assert.Equal(t, c.phrase, phrase, "keyword=%q", c.keyword)
-		assert.Equal(t, c.isPhrase, isPhrase, "keyword=%q", c.keyword)
-	}
-}