Code/repo search (#2582)

Indexed search of repository contents (for default branch only)

conf/app.ini

@@ -192,7 +192,11 @@ ITERATE_BUFFER_SIZE = 50
 
 [indexer]
 ISSUE_INDEXER_PATH = indexers/issues.bleve
+; repo indexer by default disabled, since it uses a lot of disk space
+REPO_INDEXER_ENABLED = false
+REPO_INDEXER_PATH = indexers/repos.bleve
 UPDATE_BUFFER_LEN = 20
+MAX_FILE_SIZE = 1048576
 
 [admin]
 ; Disable regular (non-admin) users to create organizations

integrations/integration_test.go

@@ -63,6 +63,10 @@ func TestMain(m *testing.M) {
 		fmt.Printf("os.RemoveAll: %v\n", err)
 		os.Exit(1)
 	}
+	if err = os.RemoveAll(setting.Indexer.RepoPath); err != nil {
+		fmt.Printf("Unable to remove repo indexer: %v\n", err)
+		os.Exit(1)
+	}
 
 	os.Exit(exitCode)
 }

integrations/mysql.ini.tmpl

@@ -12,6 +12,8 @@ PATH     = data/gitea.db
 
 [indexer]
 ISSUE_INDEXER_PATH = integrations/indexers-mysql/issues.bleve
+REPO_INDEXER_ENABLED = true
+REPO_INDEXER_PATH = integrations/indexers-mysql/repos.bleve
 
 [repository]
 ROOT = integrations/gitea-integration-mysql/gitea-repositories

integrations/pgsql.ini.tmpl

@@ -12,6 +12,8 @@ PATH     = data/gitea.db
 
 [indexer]
 ISSUE_INDEXER_PATH = integrations/indexers-pgsql/issues.bleve
+REPO_INDEXER_ENABLED = true
+REPO_INDEXER_PATH = integrations/indexers-pgsql/repos.bleve
 
 [repository]
 ROOT = integrations/gitea-integration-pgsql/gitea-repositories

integrations/repo_search_test.go

@@ -0,0 +1,35 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/stretchr/testify/assert"
+)
+
+func resultFilenames(t testing.TB, doc *HTMLDoc) []string {
+	resultsSelection := doc.doc.Find(".repository.search")
+	assert.EqualValues(t, 1, resultsSelection.Length(),
+		"Invalid template (repo search template has changed?)")
+	filenameSelections := resultsSelection.Find(".repo-search-result").Find(".header").Find("span.file")
+	result := make([]string, filenameSelections.Length())
+	filenameSelections.Each(func(i int, selection *goquery.Selection) {
+		result[i] = selection.Text()
+	})
+	return result
+}
+
+func TestSearchRepo(t *testing.T) {
+	prepareTestEnv(t)
+
+	req := NewRequestf(t, "GET", "/user2/repo1/search?q=Description&page=1")
+	resp := MakeRequest(t, req, http.StatusOK)
+
+	filenames := resultFilenames(t, NewHTMLParser(t, resp.Body))
+	assert.EqualValues(t, []string{"README.md"}, filenames)
+}

integrations/sqlite.ini

@@ -7,6 +7,8 @@ PATH     = :memory:
 
 [indexer]
 ISSUE_INDEXER_PATH = integrations/indexers-sqlite/issues.bleve
+REPO_INDEXER_ENABLED = true
+REPO_INDEXER_PATH = integrations/indexers-sqlite/repos.bleve
 
 [repository]
 ROOT = integrations/gitea-integration-sqlite/gitea-repositories

models/fixtures/repo_indexer_status.yml

@@ -0,0 +1 @@
+[] # empty

models/migrations/migrations.go

@@ -144,6 +144,8 @@ var migrations = []Migration{
 	NewMigration("remove organization watch repositories", removeOrganizationWatchRepo),
 	// v47 -> v48
 	NewMigration("add deleted branches", addDeletedBranch),
+	// v48 -> v49
+	NewMigration("add repo indexer status", addRepoIndexerStatus),
 }
 
 // Migrate database to current version

models/migrations/v48.go

@@ -0,0 +1,25 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"fmt"
+
+	"github.com/go-xorm/xorm"
+)
+
+func addRepoIndexerStatus(x *xorm.Engine) error {
+	// RepoIndexerStatus see models/repo_indexer.go
+	type RepoIndexerStatus struct {
+		ID        int64  `xorm:"pk autoincr"`
+		RepoID    int64  `xorm:"INDEX NOT NULL"`
+		CommitSha string `xorm:"VARCHAR(40)"`
+	}
+
+	if err := x.Sync2(new(RepoIndexerStatus)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}

models/models.go

@@ -13,6 +13,10 @@ import (
 	"path"
 	"strings"
 
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/util"
+
 	// Needed for the MySQL driver
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/go-xorm/core"
@@ -23,9 +27,6 @@ import (
 
 	// Needed for the MSSSQL driver
 	_ "github.com/denisenkom/go-mssqldb"
-
-	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/setting"
 )
 
 // Engine represents a xorm engine or session.
@@ -115,6 +116,7 @@ func init() {
 		new(Stopwatch),
 		new(TrackedTime),
 		new(DeletedBranch),
+		new(RepoIndexerStatus),
 	)
 
 	gonicNames := []string{"SSL", "UID"}
@@ -150,8 +152,13 @@ func LoadConfigs() {
 	DbCfg.Timeout = sec.Key("SQLITE_TIMEOUT").MustInt(500)
 
 	sec = setting.Cfg.Section("indexer")
-	setting.Indexer.IssuePath = sec.Key("ISSUE_INDEXER_PATH").MustString("indexers/issues.bleve")
+	setting.Indexer.IssuePath = absolutePath(
+		sec.Key("ISSUE_INDEXER_PATH").MustString("indexers/issues.bleve"))
+	setting.Indexer.RepoIndexerEnabled = sec.Key("REPO_INDEXER_ENABLED").MustBool(false)
+	setting.Indexer.RepoPath = absolutePath(
+		sec.Key("REPO_INDEXER_PATH").MustString("indexers/repos.bleve"))
 	setting.Indexer.UpdateQueueLength = sec.Key("UPDATE_BUFFER_LEN").MustInt(20)
+	setting.Indexer.MaxIndexerFileSize = sec.Key("MAX_FILE_SIZE").MustInt64(512 * 1024 * 1024)
 }
 
 // parsePostgreSQLHostPort parses given input in various forms defined in
@@ -336,3 +343,12 @@ func DumpDatabase(filePath string, dbType string) error {
 	}
 	return x.DumpTablesToFile(tbs, filePath)
 }
+
+// absolutePath make path absolute if it is relative
+func absolutePath(path string) string {
+	workDir, err := setting.WorkDir()
+	if err != nil {
+		log.Fatal(4, "Failed to get work directory: %v", err)
+	}
+	return util.EnsureAbsolutePath(path, workDir)
+}

models/repo.go

@@ -205,10 +205,11 @@ type Repository struct {
 	ExternalMetas map[string]string `xorm:"-"`
 	Units         []*RepoUnit       `xorm:"-"`
 
-	IsFork   bool        `xorm:"INDEX NOT NULL DEFAULT false"`
-	ForkID   int64       `xorm:"INDEX"`
-	BaseRepo *Repository `xorm:"-"`
-	Size     int64       `xorm:"NOT NULL DEFAULT 0"`
+	IsFork        bool               `xorm:"INDEX NOT NULL DEFAULT false"`
+	ForkID        int64              `xorm:"INDEX"`
+	BaseRepo      *Repository        `xorm:"-"`
+	Size          int64              `xorm:"NOT NULL DEFAULT 0"`
+	IndexerStatus *RepoIndexerStatus `xorm:"-"`
 
 	Created     time.Time `xorm:"-"`
 	CreatedUnix int64     `xorm:"INDEX created"`
@@ -782,8 +783,10 @@ func UpdateLocalCopyBranch(repoPath, localPath, branch string) error {
 		if err != nil {
 			return fmt.Errorf("git fetch origin: %v", err)
 		}
-		if err := git.ResetHEAD(localPath, true, "origin/"+branch); err != nil {
-			return fmt.Errorf("git reset --hard origin/%s: %v", branch, err)
+		if len(branch) > 0 {
+			if err := git.ResetHEAD(localPath, true, "origin/"+branch); err != nil {
+				return fmt.Errorf("git reset --hard origin/%s: %v", branch, err)
+			}
 		}
 	}
 	return nil
@@ -989,6 +992,7 @@ func MigrateRepository(doer, u *User, opts MigrateRepoOptions) (*Repository, err
 		if err = SyncReleasesWithTags(repo, gitRepo); err != nil {
 			log.Error(4, "Failed to synchronize tags to releases for repository: %v", err)
 		}
+		UpdateRepoIndexer(repo)
 	}
 
 	if err = repo.UpdateSize(); err != nil {
@@ -1883,6 +1887,7 @@ func DeleteRepository(doer *User, uid, repoID int64) error {
 		go HookQueue.Add(repo.ID)
 	}
 
+	DeleteRepoFromIndexer(repo)
 	return nil
 }
 

models/repo_editor.go

@@ -178,6 +178,8 @@ func (repo *Repository) UpdateRepoFile(doer *User, opts UpdateRepoFileOptions) (
 	if err != nil {
 		return fmt.Errorf("PushUpdate: %v", err)
 	}
+	UpdateRepoIndexer(repo)
+
 	return nil
 }
 

models/update.go

@@ -263,6 +263,10 @@ func pushUpdate(opts PushUpdateOptions) (repo *Repository, err error) {
 		commits = ListToPushCommits(l)
 	}
 
+	if opts.RefFullName == git.BranchPrefix+repo.DefaultBranch {
+		UpdateRepoIndexer(repo)
+	}
+
 	if err := CommitRepoAction(CommitRepoActionOptions{
 		PusherName:  opts.PusherName,
 		RepoOwnerID: owner.ID,

modules/context/repo.go

@@ -367,6 +367,7 @@ func RepoAssignment() macaron.Handler {
 		ctx.Data["DisableSSH"] = setting.SSH.Disabled
 		ctx.Data["ExposeAnonSSH"] = setting.SSH.ExposeAnonymous
 		ctx.Data["DisableHTTP"] = setting.Repository.DisableHTTPGit
+		ctx.Data["RepoSearchEnabled"] = setting.Indexer.RepoIndexerEnabled
 		ctx.Data["CloneLink"] = repo.CloneLink()
 		ctx.Data["WikiCloneLink"] = repo.WikiCloneLink()
 

modules/indexer/repo.go

@@ -0,0 +1,199 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package indexer
+
+import (
+	"os"
+	"strings"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/blevesearch/bleve"
+	"github.com/blevesearch/bleve/analysis/analyzer/custom"
+	"github.com/blevesearch/bleve/analysis/token/camelcase"
+	"github.com/blevesearch/bleve/analysis/token/lowercase"
+	"github.com/blevesearch/bleve/analysis/tokenizer/unicode"
+)
+
+const repoIndexerAnalyzer = "repoIndexerAnalyzer"
+
+// repoIndexer (thread-safe) index for repository contents
+var repoIndexer bleve.Index
+
+// RepoIndexerOp type of operation to perform on repo indexer
+type RepoIndexerOp int
+
+const (
+	// RepoIndexerOpUpdate add/update a file's contents
+	RepoIndexerOpUpdate = iota
+
+	// RepoIndexerOpDelete delete a file
+	RepoIndexerOpDelete
+)
+
+// RepoIndexerData data stored in the repo indexer
+type RepoIndexerData struct {
+	RepoID  int64
+	Content string
+}
+
+// RepoIndexerUpdate an update to the repo indexer
+type RepoIndexerUpdate struct {
+	Filepath string
+	Op       RepoIndexerOp
+	Data     *RepoIndexerData
+}
+
+func (update RepoIndexerUpdate) addToBatch(batch *bleve.Batch) error {
+	id := filenameIndexerID(update.Data.RepoID, update.Filepath)
+	switch update.Op {
+	case RepoIndexerOpUpdate:
+		return batch.Index(id, update.Data)
+	case RepoIndexerOpDelete:
+		batch.Delete(id)
+	default:
+		log.Error(4, "Unrecognized repo indexer op: %d", update.Op)
+	}
+	return nil
+}
+
+// InitRepoIndexer initialize repo indexer
+func InitRepoIndexer(populateIndexer func() error) {
+	_, err := os.Stat(setting.Indexer.RepoPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if err = createRepoIndexer(); err != nil {
+				log.Fatal(4, "CreateRepoIndexer: %v", err)
+			}
+			if err = populateIndexer(); err != nil {
+				log.Fatal(4, "PopulateRepoIndex: %v", err)
+			}
+		} else {
+			log.Fatal(4, "InitRepoIndexer: %v", err)
+		}
+	} else {
+		repoIndexer, err = bleve.Open(setting.Indexer.RepoPath)
+		if err != nil {
+			log.Fatal(4, "InitRepoIndexer, open index: %v", err)
+		}
+	}
+}
+
+// createRepoIndexer create a repo indexer if one does not already exist
+func createRepoIndexer() error {
+	docMapping := bleve.NewDocumentMapping()
+	docMapping.AddFieldMappingsAt("RepoID", bleve.NewNumericFieldMapping())
+
+	textFieldMapping := bleve.NewTextFieldMapping()
+	docMapping.AddFieldMappingsAt("Content", textFieldMapping)
+
+	mapping := bleve.NewIndexMapping()
+	if err := addUnicodeNormalizeTokenFilter(mapping); err != nil {
+		return err
+	} else if err := mapping.AddCustomAnalyzer(repoIndexerAnalyzer, map[string]interface{}{
+		"type":          custom.Name,
+		"char_filters":  []string{},
+		"tokenizer":     unicode.Name,
+		"token_filters": []string{unicodeNormalizeName, camelcase.Name, lowercase.Name},
+	}); err != nil {
+		return err
+	}
+	mapping.DefaultAnalyzer = repoIndexerAnalyzer
+	mapping.AddDocumentMapping("repo", docMapping)
+	var err error
+	repoIndexer, err = bleve.New(setting.Indexer.RepoPath, mapping)
+	return err
+}
+
+func filenameIndexerID(repoID int64, filename string) string {
+	return indexerID(repoID) + "_" + filename
+}
+
+func filenameOfIndexerID(indexerID string) string {
+	index := strings.IndexByte(indexerID, '_')
+	if index == -1 {
+		log.Error(4, "Unexpected ID in repo indexer: %s", indexerID)
+	}
+	return indexerID[index+1:]
+}
+
+// RepoIndexerBatch batch to add updates to
+func RepoIndexerBatch() *Batch {
+	return &Batch{
+		batch: repoIndexer.NewBatch(),
+		index: repoIndexer,
+	}
+}
+
+// DeleteRepoFromIndexer delete all of a repo's files from indexer
+func DeleteRepoFromIndexer(repoID int64) error {
+	query := numericEqualityQuery(repoID, "RepoID")
+	searchRequest := bleve.NewSearchRequestOptions(query, 2147483647, 0, false)
+	result, err := repoIndexer.Search(searchRequest)
+	if err != nil {
+		return err
+	}
+	batch := RepoIndexerBatch()
+	for _, hit := range result.Hits {
+		batch.batch.Delete(hit.ID)
+		if err = batch.flushIfFull(); err != nil {
+			return err
+		}
+	}
+	return batch.Flush()
+}
+
+// RepoSearchResult result of performing a search in a repo
+type RepoSearchResult struct {
+	StartIndex int
+	EndIndex   int
+	Filename   string
+	Content    string
+}
+
+// SearchRepoByKeyword searches for files in the specified repo.
+// Returns the matching file-paths
+func SearchRepoByKeyword(repoID int64, keyword string, page, pageSize int) (int64, []*RepoSearchResult, error) {
+	phraseQuery := bleve.NewMatchPhraseQuery(keyword)
+	phraseQuery.FieldVal = "Content"
+	phraseQuery.Analyzer = repoIndexerAnalyzer
+	indexerQuery := bleve.NewConjunctionQuery(
+		numericEqualityQuery(repoID, "RepoID"),
+		phraseQuery,
+	)
+	from := (page - 1) * pageSize
+	searchRequest := bleve.NewSearchRequestOptions(indexerQuery, pageSize, from, false)
+	searchRequest.Fields = []string{"Content"}
+	searchRequest.IncludeLocations = true
+
+	result, err := repoIndexer.Search(searchRequest)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	searchResults := make([]*RepoSearchResult, len(result.Hits))
+	for i, hit := range result.Hits {
+		var startIndex, endIndex int = -1, -1
+		for _, locations := range hit.Locations["Content"] {
+			location := locations[0]
+			locationStart := int(location.Start)
+			locationEnd := int(location.End)
+			if startIndex < 0 || locationStart < startIndex {
+				startIndex = locationStart
+			}
+			if endIndex < 0 || locationEnd > endIndex {
+				endIndex = locationEnd
+			}
+		}
+		searchResults[i] = &RepoSearchResult{
+			StartIndex: startIndex,
+			EndIndex:   endIndex,
+			Filename:   filenameOfIndexerID(hit.ID),
+			Content:    hit.Fields["Content"].(string),
+		}
+	}
+	return int64(result.Total), searchResults, nil
+}

modules/search/search.go

@@ -0,0 +1,128 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package search
+
+import (
+	"bytes"
+	gotemplate "html/template"
+	"strings"
+
+	"code.gitea.io/gitea/modules/highlight"
+	"code.gitea.io/gitea/modules/indexer"
+	"code.gitea.io/gitea/modules/util"
+)
+
+// Result a search result to display
+type Result struct {
+	Filename       string
+	HighlightClass string
+	LineNumbers    []int
+	FormattedLines gotemplate.HTML
+}
+
+func indices(content string, selectionStartIndex, selectionEndIndex int) (int, int) {
+	startIndex := selectionStartIndex
+	numLinesBefore := 0
+	for ; startIndex > 0; startIndex-- {
+		if content[startIndex-1] == '\n' {
+			if numLinesBefore == 1 {
+				break
+			}
+			numLinesBefore++
+		}
+	}
+
+	endIndex := selectionEndIndex
+	numLinesAfter := 0
+	for ; endIndex < len(content); endIndex++ {
+		if content[endIndex] == '\n' {
+			if numLinesAfter == 1 {
+				break
+			}
+			numLinesAfter++
+		}
+	}
+
+	return startIndex, endIndex
+}
+
+func writeStrings(buf *bytes.Buffer, strs ...string) error {
+	for _, s := range strs {
+		_, err := buf.WriteString(s)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func searchResult(result *indexer.RepoSearchResult, startIndex, endIndex int) (*Result, error) {
+	startLineNum := 1 + strings.Count(result.Content[:startIndex], "\n")
+
+	var formattedLinesBuffer bytes.Buffer
+
+	contentLines := strings.SplitAfter(result.Content[startIndex:endIndex], "\n")
+	lineNumbers := make([]int, len(contentLines))
+	index := startIndex
+	for i, line := range contentLines {
+		var err error
+		if index < result.EndIndex &&
+			result.StartIndex < index+len(line) &&
+			result.StartIndex < result.EndIndex {
+			openActiveIndex := util.Max(result.StartIndex-index, 0)
+			closeActiveIndex := util.Min(result.EndIndex-index, len(line))
+			err = writeStrings(&formattedLinesBuffer,
+				`<li>`,
+				line[:openActiveIndex],
+				`<span class='active'>`,
+				line[openActiveIndex:closeActiveIndex],
+				`</span>`,
+				line[closeActiveIndex:],
+				`</li>`,
+			)
+		} else {
+			err = writeStrings(&formattedLinesBuffer,
+				`<li>`,
+				line,
+				`</li>`,
+			)
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		lineNumbers[i] = startLineNum + i
+		index += len(line)
+	}
+	return &Result{
+		Filename:       result.Filename,
+		HighlightClass: highlight.FileNameToHighlightClass(result.Filename),
+		LineNumbers:    lineNumbers,
+		FormattedLines: gotemplate.HTML(formattedLinesBuffer.String()),
+	}, nil
+}
+
+// PerformSearch perform a search on a repository
+func PerformSearch(repoID int64, keyword string, page, pageSize int) (int, []*Result, error) {
+	if len(keyword) == 0 {
+		return 0, nil, nil
+	}
+
+	total, results, err := indexer.SearchRepoByKeyword(repoID, keyword, page, pageSize)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	displayResults := make([]*Result, len(results))
+
+	for i, result := range results {
+		startIndex, endIndex := indices(result.Content, result.StartIndex, result.EndIndex)
+		displayResults[i], err = searchResult(result, startIndex, endIndex)
+		if err != nil {
+			return 0, nil, err
+		}
+	}
+	return int(total), displayResults, nil
+}

modules/setting/setting.go

@@ -140,8 +140,11 @@ var (
 
 	// Indexer settings
 	Indexer struct {
-		IssuePath         string
-		UpdateQueueLength int
+		IssuePath          string
+		RepoIndexerEnabled bool
+		RepoPath           string
+		UpdateQueueLength  int
+		MaxIndexerFileSize int64
 	}
 
 	// Webhook settings
@@ -234,12 +237,13 @@ var (
 
 	// UI settings
 	UI = struct {
-		ExplorePagingNum   int
-		IssuePagingNum     int
-		FeedMaxCommitNum   int
-		ThemeColorMetaTag  string
-		MaxDisplayFileSize int64
-		ShowUserEmail      bool
+		ExplorePagingNum    int
+		IssuePagingNum      int
+		RepoSearchPagingNum int
+		FeedMaxCommitNum    int
+		ThemeColorMetaTag   string
+		MaxDisplayFileSize  int64
+		ShowUserEmail       bool
 
 		Admin struct {
 			UserPagingNum   int
@@ -256,11 +260,12 @@ var (
 			Keywords    string
 		} `ini:"ui.meta"`
 	}{
-		ExplorePagingNum:   20,
-		IssuePagingNum:     10,
-		FeedMaxCommitNum:   5,
-		ThemeColorMetaTag:  `#6cc644`,
-		MaxDisplayFileSize: 8388608,
+		ExplorePagingNum:    20,
+		IssuePagingNum:      10,
+		RepoSearchPagingNum: 10,
+		FeedMaxCommitNum:    5,
+		ThemeColorMetaTag:   `#6cc644`,
+		MaxDisplayFileSize:  8388608,
 		Admin: struct {
 			UserPagingNum   int
 			RepoPagingNum   int

modules/util/path.go

@@ -0,0 +1,16 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package util
+
+import "path/filepath"
+
+// EnsureAbsolutePath ensure that a path is absolute, making it
+// relative to absoluteBase if necessary
+func EnsureAbsolutePath(path string, absoluteBase string) string {
+	if filepath.IsAbs(path) {
+		return path
+	}
+	return filepath.Join(absoluteBase, path)
+}

modules/util/util.go

@@ -38,3 +38,19 @@ func OptionalBoolOf(b bool) OptionalBool {
 	}
 	return OptionalBoolFalse
 }
+
+// Max max of two ints
+func Max(a, b int) int {
+	if a < b {
+		return b
+	}
+	return a
+}
+
+// Min min of two ints
+func Min(a, b int) int {
+	if a > b {
+		return b
+	}
+	return a
+}

options/locale/locale_en-US.ini

@@ -848,6 +848,10 @@ activity.title.releases_n = %d Releases
 activity.title.releases_published_by = %s published by %s
 activity.published_release_label = Published
 
+search = Search
+search.search_repo = Search repository
+search.results = Search results for "%s" in <a href="%s">%s</a>
+
 settings = Settings
 settings.desc = Settings is where you can manage the settings for the repository
 settings.options = Options

public/less/_repository.less

@@ -158,6 +158,11 @@
     }
 
     &.file.list {
+        .repo-description {
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
         #repo-desc {
             font-size: 1.2em;
         }
@@ -226,7 +231,7 @@
                         }
         }
 
-        #file-content {
+        .non-diff-file-content {
             .header {
                 .icon {
                     font-size: 1em;
@@ -244,7 +249,7 @@
                         background: transparent;
                         border: 0;
                         outline: none;
-                     }
+                    }
                     .btn-octicon:hover {
                         color: #4078c0;
                     }
@@ -323,6 +328,9 @@
                         }
                     }
                 }
+                .active {
+                    background: #ffffdd;
+                }
             }
         }
 
@@ -1038,6 +1046,13 @@
         overflow-x: auto;
         overflow-y: hidden;
     }
+    .repo-search-result {
+        padding-top: 10px;
+        padding-bottom: 10px;
+        .lines-num a {
+            color: inherit;
+        }
+    }
 
     &.quickstart {
         .guide {

routers/init.go

@@ -66,6 +66,7 @@ func GlobalInit() {
 		// Booting long running goroutines.
 		cron.NewContext()
 		models.InitIssueIndexer()
+		models.InitRepoIndexer()
 		models.InitSyncMirrors()
 		models.InitDeliverHooks()
 		models.InitTestPullRequests()

routers/repo/search.go

@@ -0,0 +1,46 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package repo
+
+import (
+	"path"
+	"strings"
+
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/search"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/Unknwon/paginater"
+)
+
+const tplSearch base.TplName = "repo/search"
+
+// Search render repository search page
+func Search(ctx *context.Context) {
+	if !setting.Indexer.RepoIndexerEnabled {
+		ctx.Redirect(ctx.Repo.RepoLink, 302)
+		return
+	}
+	keyword := strings.TrimSpace(ctx.Query("q"))
+	page := ctx.QueryInt("page")
+	if page <= 0 {
+		page = 1
+	}
+	total, searchResults, err := search.PerformSearch(ctx.Repo.Repository.ID, keyword, page, setting.UI.RepoSearchPagingNum)
+	if err != nil {
+		ctx.Handle(500, "SearchResults", err)
+		return
+	}
+	ctx.Data["Keyword"] = keyword
+	pager := paginater.New(total, setting.UI.RepoSearchPagingNum, page, 5)
+	ctx.Data["Page"] = pager
+	ctx.Data["SourcePath"] = setting.AppSubURL + "/" +
+		path.Join(ctx.Repo.Repository.Owner.Name, ctx.Repo.Repository.Name, "src", ctx.Repo.Repository.DefaultBranch)
+	ctx.Data["SearchResults"] = searchResults
+	ctx.Data["RequireHighlightJS"] = true
+	ctx.Data["PageIsViewCode"] = true
+	ctx.HTML(200, tplSearch)
+}

routers/routes/routes.go

@@ -649,6 +649,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 	m.Group("/:username/:reponame", func() {
 		m.Get("/stars", repo.Stars)
 		m.Get("/watchers", repo.Watchers)
+		m.Get("/search", context.CheckUnit(models.UnitTypeCode), repo.Search)
 	}, ignSignIn, context.RepoAssignment(), context.RepoRef(), context.UnitTypes(), context.LoadRepoUnits())
 
 	m.Group("/:username", func() {

templates/repo/home.tmpl

@@ -3,10 +3,26 @@
 	{{template "repo/header" .}}
 	<div class="ui container">
 		{{template "base/alert" .}}
-		<p id="repo-desc">
-			{{if .Repository.DescriptionHTML}}<span class="description has-emoji">{{.Repository.DescriptionHTML}}</span>{{else if .IsRepositoryAdmin}}<span class="no-description text-italic">{{.i18n.Tr "repo.no_desc"}}</span>{{end}}
-			<a class="link" href="{{.Repository.Website}}">{{.Repository.Website}}</a>
-		</p>
+		<div class="ui repo-description">
+			<div id="repo-desc">
+				{{if .Repository.DescriptionHTML}}<span class="description has-emoji">{{.Repository.DescriptionHTML}}</span>{{else if .IsRepositoryAdmin}}<span class="no-description text-italic">{{.i18n.Tr "repo.no_desc"}}</span>{{end}}
+				<a class="link" href="{{.Repository.Website}}">{{.Repository.Website}}</a>
+			</div>
+			{{if .RepoSearchEnabled}}
+				<div class="ui repo-search">
+					<form class="ui form" action="{{.RepoLink}}/search" method="get">
+						<div class="field">
+							<div class="ui action input">
+								<input name="q" value="{{.Keyword}}" placeholder="{{.i18n.Tr "repo.search.search_repo"}}">
+								<button class="ui icon button" type="submit">
+									<i class="search icon"></i>
+								</button>
+							</div>
+						</div>
+					</form>
+				</div>
+			{{end}}
+		</div>
 		{{template "repo/sub_menu" .}}
 		<div class="ui secondary menu">
 			{{if .PullRequestCtx.Allowed}}

templates/repo/search.tmpl

@@ -0,0 +1,49 @@
+{{template "base/head" .}}
+<div class="repository file list">
+	{{template "repo/header" .}}
+	<div class="ui container">
+		<div class="ui repo-search">
+			<form class="ui form" method="get">
+				<div class="ui fluid action input">
+					<input name="q" value="{{.Keyword}}" placeholder="{{.i18n.Tr "repo.search.search_repo"}}">
+					<button class="ui button" type="submit">
+						<i class="search icon"></i>
+					</button>
+				</div>
+			</form>
+		</div>
+		{{if .Keyword}}
+			<h3>
+				{{.i18n.Tr "repo.search.results" .Keyword .RepoLink .RepoName | Str2html}}
+			</h3>
+			<div class="repository search">
+				{{range $result := .SearchResults}}
+					<div class="diff-file-box diff-box file-content non-diff-file-content repo-search-result">
+						<h4 class="ui top attached normal header">
+							<span class="file">{{.Filename}}</span>
+							<a class="ui basic grey tiny button" rel="nofollow" href="{{EscapePound $.SourcePath}}/{{EscapePound .Filename}}">{{$.i18n.Tr "repo.diff.view_file"}}</a>
+						</h4>
+						<div class="ui attached table segment">
+							<div class="file-body file-code code-view">
+								<table>
+									<tbody>
+										<tr>
+											<td class="lines-num">
+												{{range .LineNumbers}}
+													<a href="{{EscapePound $.SourcePath}}/{{EscapePound $result.Filename}}#L{{.}}"><span>{{.}}</span></a>
+												{{end}}
+											</td>
+											<td class="lines-code"><pre><code class="{{.HighlightClass}}"><ol class="linenums">{{.FormattedLines}}</ol></code></pre></td>
+										</tr>
+									</tbody>
+								</table>
+							</div>
+						</div>
+					</div>
+				{{end}}
+			</div>
+			{{template "base/paginate" .}}
+		{{end}}
+	</div>
+</div>
+{{template "base/footer" .}}

templates/repo/view_file.tmpl

@@ -1,4 +1,4 @@
-<div id="file-content" class="{{TabSizeClass .Editorconfig .FileName}}">
+<div class="{{TabSizeClass .Editorconfig .FileName}} non-diff-file-content">
 	<h4 class="ui top attached header" id="{{if .ReadmeExist}}repo-readme{{else}}repo-read-file{{end}}">
 		{{if .ReadmeExist}}
 			<i class="book icon ui left"></i>

vendor/github.com/blevesearch/bleve/analysis/token/camelcase/camelcase.go

@@ -0,0 +1,78 @@
+//  Copyright (c) 2016 Couchbase, Inc.
+//
+// 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 camelcase
+
+import (
+	"bytes"
+	"unicode/utf8"
+
+	"github.com/blevesearch/bleve/analysis"
+	"github.com/blevesearch/bleve/registry"
+)
+
+const Name = "camelCase"
+
+// CamelCaseFilter splits a given token into a set of tokens where each resulting token
+// falls into one the following classes:
+// 1) Upper case followed by lower case letters.
+//		Terminated by a number, an upper case letter, and a non alpha-numeric symbol.
+// 2) Upper case followed by upper case letters.
+//		Terminated by a number, an upper case followed by a lower case letter, and a non alpha-numeric symbol.
+// 3) Lower case followed by lower case letters.
+//		Terminated by a number, an upper case letter, and a non alpha-numeric symbol.
+// 4) Number followed by numbers.
+//		Terminated by a letter, and a non alpha-numeric symbol.
+// 5) Non alpha-numeric symbol followed by non alpha-numeric symbols.
+//		Terminated by a number, and a letter.
+//
+// It does a one-time sequential pass over an input token, from left to right.
+// The scan is greedy and generates the longest substring that fits into one of the classes.
+//
+// See the test file for examples of classes and their parsings.
+type CamelCaseFilter struct{}
+
+func NewCamelCaseFilter() *CamelCaseFilter {
+	return &CamelCaseFilter{}
+}
+
+func (f *CamelCaseFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
+	rv := make(analysis.TokenStream, 0, len(input))
+
+	nextPosition := 1
+	for _, token := range input {
+		runeCount := utf8.RuneCount(token.Term)
+		runes := bytes.Runes(token.Term)
+
+		p := NewParser(runeCount, nextPosition, token.Start)
+		for i := 0; i < runeCount; i++ {
+			if i+1 >= runeCount {
+				p.Push(runes[i], nil)
+			} else {
+				p.Push(runes[i], &runes[i+1])
+			}
+		}
+		rv = append(rv, p.FlushTokens()...)
+		nextPosition = p.NextPosition()
+	}
+	return rv
+}
+
+func CamelCaseFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
+	return NewCamelCaseFilter(), nil
+}
+
+func init() {
+	registry.RegisterTokenFilter(Name, CamelCaseFilterConstructor)
+}