enable literal string for code search (#33590)

Close: #33588

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

modules/indexer/code/bleve/bleve.go

@@ -260,17 +260,28 @@ func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int
 	var (
 		indexerQuery query.Query
 		keywordQuery query.Query
+		contentQuery query.Query
 	)
 
 	pathQuery := bleve.NewPrefixQuery(strings.ToLower(opts.Keyword))
 	pathQuery.FieldVal = "Filename"
 	pathQuery.SetBoost(10)
 
-	contentQuery := bleve.NewMatchQuery(opts.Keyword)
-	contentQuery.FieldVal = "Content"
-
-	if opts.IsKeywordFuzzy {
-		contentQuery.Fuzziness = inner_bleve.GuessFuzzinessByKeyword(opts.Keyword)
+	keywordAsPhrase, isPhrase := internal.ParseKeywordAsPhrase(opts.Keyword)
+	if isPhrase {
+		q := bleve.NewMatchPhraseQuery(keywordAsPhrase)
+		q.FieldVal = "Content"
+		if opts.IsKeywordFuzzy {
+			q.Fuzziness = inner_bleve.GuessFuzzinessByKeyword(keywordAsPhrase)
+		}
+		contentQuery = q
+	} else {
+		q := bleve.NewMatchQuery(opts.Keyword)
+		q.FieldVal = "Content"
+		if opts.IsKeywordFuzzy {
+			q.Fuzziness = inner_bleve.GuessFuzzinessByKeyword(opts.Keyword)
+		}
+		contentQuery = q
 	}
 
 	keywordQuery = bleve.NewDisjunctionQuery(contentQuery, pathQuery)

modules/indexer/code/elasticsearch/elasticsearch.go

@@ -24,6 +24,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/typesniffer"
+	"code.gitea.io/gitea/modules/util"
 
 	"github.com/go-enry/go-enry/v2"
 	"github.com/olivere/elastic/v7"
@@ -359,13 +360,19 @@ func extractAggs(searchResult *elastic.SearchResult) []*internal.SearchResultLan
 
 // Search searches for codes and language stats by given conditions.
 func (b *Indexer) Search(ctx context.Context, opts *internal.SearchOptions) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
-	searchType := esMultiMatchTypePhrasePrefix
-	if opts.IsKeywordFuzzy {
-		searchType = esMultiMatchTypeBestFields
+	var contentQuery elastic.Query
+	keywordAsPhrase, isPhrase := internal.ParseKeywordAsPhrase(opts.Keyword)
+	if isPhrase {
+		contentQuery = elastic.NewMatchPhraseQuery("content", keywordAsPhrase)
+	} else {
+		// TODO: this is the old logic, but not really using "fuzziness"
+		// * IsKeywordFuzzy=true: "best_fields"
+		// * IsKeywordFuzzy=false: "phrase_prefix"
+		contentQuery = elastic.NewMultiMatchQuery("content", opts.Keyword).
+			Type(util.Iif(opts.IsKeywordFuzzy, esMultiMatchTypeBestFields, esMultiMatchTypePhrasePrefix))
 	}
-
 	kwQuery := elastic.NewBoolQuery().Should(
-		elastic.NewMultiMatchQuery(opts.Keyword, "content").Type(searchType),
+		contentQuery,
 		elastic.NewMultiMatchQuery(opts.Keyword, "filename^10").Type(esMultiMatchTypePhrasePrefix),
 	)
 	query := elastic.NewBoolQuery()

modules/indexer/code/gitgrep/gitgrep.go

@@ -0,0 +1,59 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package gitgrep
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/modules/git"
+	code_indexer "code.gitea.io/gitea/modules/indexer/code"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+func indexSettingToGitGrepPathspecList() (list []string) {
+	for _, expr := range setting.Indexer.IncludePatterns {
+		list = append(list, ":(glob)"+expr.PatternString())
+	}
+	for _, expr := range setting.Indexer.ExcludePatterns {
+		list = append(list, ":(glob,exclude)"+expr.PatternString())
+	}
+	return list
+}
+
+func PerformSearch(ctx context.Context, page int, repoID int64, gitRepo *git.Repository, ref git.RefName, keyword string, isFuzzy bool) (searchResults []*code_indexer.Result, total int, err error) {
+	// TODO: it should also respect ParseKeywordAsPhrase and clarify the "fuzzy" behavior
+	res, err := git.GrepSearch(ctx, gitRepo, keyword, git.GrepOptions{
+		ContextLineNumber: 1,
+		IsFuzzy:           isFuzzy,
+		RefName:           ref.String(),
+		PathspecList:      indexSettingToGitGrepPathspecList(),
+	})
+	if err != nil {
+		// TODO: if no branch exists, it reports: exit status 128, fatal: this operation must be run in a work tree.
+		return nil, 0, fmt.Errorf("git.GrepSearch: %w", err)
+	}
+	commitID, err := gitRepo.GetRefCommitID(ref.String())
+	if err != nil {
+		return nil, 0, fmt.Errorf("gitRepo.GetRefCommitID: %w", err)
+	}
+
+	total = len(res)
+	pageStart := min((page-1)*setting.UI.RepoSearchPagingNum, len(res))
+	pageEnd := min(page*setting.UI.RepoSearchPagingNum, len(res))
+	res = res[pageStart:pageEnd]
+	for _, r := range res {
+		searchResults = append(searchResults, &code_indexer.Result{
+			RepoID:   repoID,
+			Filename: r.Filename,
+			CommitID: commitID,
+			// UpdatedUnix: not supported yet
+			// Language:    not supported yet
+			// Color:       not supported yet
+			Lines: code_indexer.HighlightSearchResultCode(r.Filename, "", r.LineNumbers, strings.Join(r.LineCodes, "\n")),
+		})
+	}
+	return searchResults, total, nil
+}

modules/indexer/code/gitgrep/gitgrep_test.go

@@ -1,7 +1,7 @@
 // Copyright 2024 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-package repo
+package gitgrep
 
 import (
 	"testing"

modules/indexer/code/indexer.go

@@ -29,13 +29,11 @@ var (
 	// When the real indexer is not ready, it will be a dummy indexer which will return error to explain it's not ready.
 	// So it's always safe use it as *globalIndexer.Load() and call its methods.
 	globalIndexer atomic.Pointer[internal.Indexer]
-	dummyIndexer  *internal.Indexer
 )
 
 func init() {
-	i := internal.NewDummyIndexer()
-	dummyIndexer = &i
-	globalIndexer.Store(dummyIndexer)
+	dummyIndexer := internal.NewDummyIndexer()
+	globalIndexer.Store(&dummyIndexer)
 }
 
 func index(ctx context.Context, indexer internal.Indexer, repoID int64) error {

modules/indexer/code/internal/util.go

@@ -35,7 +35,7 @@ func FilenameOfIndexerID(indexerID string) string {
 	return indexerID[index+1:]
 }
 
-// Given the contents of file, returns the boundaries of its first seven lines.
+// FilenameMatchIndexPos returns the boundaries of its first seven lines.
 func FilenameMatchIndexPos(content string) (int, int) {
 	count := 1
 	for i, c := range content {
@@ -48,3 +48,11 @@ 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

@@ -0,0 +1,30 @@
+// 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)
+	}
+}

routers/web/repo/search.go

@@ -5,11 +5,11 @@ package repo
 
 import (
 	"net/http"
-	"strings"
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/git"
 	code_indexer "code.gitea.io/gitea/modules/indexer/code"
+	"code.gitea.io/gitea/modules/indexer/code/gitgrep"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/routers/common"
@@ -18,16 +18,6 @@ import (
 
 const tplSearch templates.TplName = "repo/search"
 
-func indexSettingToGitGrepPathspecList() (list []string) {
-	for _, expr := range setting.Indexer.IncludePatterns {
-		list = append(list, ":(glob)"+expr.PatternString())
-	}
-	for _, expr := range setting.Indexer.ExcludePatterns {
-		list = append(list, ":(glob,exclude)"+expr.PatternString())
-	}
-	return list
-}
-
 // Search render repository search page
 func Search(ctx *context.Context) {
 	ctx.Data["PageIsViewCode"] = true
@@ -67,38 +57,14 @@ func Search(ctx *context.Context) {
 			ctx.Data["CodeIndexerUnavailable"] = !code_indexer.IsAvailable(ctx)
 		}
 	} else {
-		searchRefName := git.RefNameFromBranch(ctx.Repo.Repository.DefaultBranch) // BranchName should be default branch or the first existing branch
-		res, err := git.GrepSearch(ctx, ctx.Repo.GitRepo, prepareSearch.Keyword, git.GrepOptions{
-			ContextLineNumber: 1,
-			IsFuzzy:           prepareSearch.IsFuzzy,
-			RefName:           searchRefName.String(),
-			PathspecList:      indexSettingToGitGrepPathspecList(),
-		})
-		if err != nil {
-			// TODO: if no branch exists, it reports: exit status 128, fatal: this operation must be run in a work tree.
-			ctx.ServerError("GrepSearch", err)
-			return
-		}
-		commitID, err := ctx.Repo.GitRepo.GetRefCommitID(searchRefName.String())
+		var err error
+		// ref should be default branch or the first existing branch
+		searchRef := git.RefNameFromBranch(ctx.Repo.Repository.DefaultBranch)
+		searchResults, total, err = gitgrep.PerformSearch(ctx, page, ctx.Repo.Repository.ID, ctx.Repo.GitRepo, searchRef, prepareSearch.Keyword, prepareSearch.IsFuzzy)
 		if err != nil {
-			ctx.ServerError("GetRefCommitID", err)
+			ctx.ServerError("gitgrep.PerformSearch", err)
 			return
 		}
-		total = len(res)
-		pageStart := min((page-1)*setting.UI.RepoSearchPagingNum, len(res))
-		pageEnd := min(page*setting.UI.RepoSearchPagingNum, len(res))
-		res = res[pageStart:pageEnd]
-		for _, r := range res {
-			searchResults = append(searchResults, &code_indexer.Result{
-				RepoID:   ctx.Repo.Repository.ID,
-				Filename: r.Filename,
-				CommitID: commitID,
-				// UpdatedUnix: not supported yet
-				// Language:    not supported yet
-				// Color:       not supported yet
-				Lines: code_indexer.HighlightSearchResultCode(r.Filename, "", r.LineNumbers, strings.Join(r.LineCodes, "\n")),
-			})
-		}
 	}
 
 	ctx.Data["Repo"] = ctx.Repo.Repository