Extract linguist code to method (#29168)

(cherry picked from commit 94d06be035bac468129903c9f32e785baf3c1c3b)

routers/web/repo/blame.go

@@ -19,6 +19,7 @@ import (
 	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
+	files_service "code.gitea.io/gitea/services/repository/files"
 )
 
 type blameRow struct {
@@ -218,31 +219,11 @@ func processBlameParts(ctx *context.Context, blameParts []*git.BlamePart) map[st
 func renderBlame(ctx *context.Context, blameParts []*git.BlamePart, commitNames map[string]*user_model.UserCommit) {
 	repoLink := ctx.Repo.RepoLink
 
-	language := ""
+	language, err := files_service.TryGetContentLanguage(ctx.Repo.GitRepo, ctx.Repo.CommitID, ctx.Repo.TreePath)
-
+	if err != nil {
-	indexFilename, worktree, deleteTemporaryFile, err := ctx.Repo.GitRepo.ReadTreeToTemporaryIndex(ctx.Repo.CommitID)
+		log.Error("Unable to get file language for %-v:%s. Error: %v", ctx.Repo.Repository, ctx.Repo.TreePath, err)
-	if err == nil {
-		defer deleteTemporaryFile()
-
-		filename2attribute2info, err := ctx.Repo.GitRepo.CheckAttribute(git.CheckAttributeOpts{
-			CachedOnly: true,
-			Attributes: []string{"linguist-language", "gitlab-language"},
-			Filenames:  []string{ctx.Repo.TreePath},
-			IndexFile:  indexFilename,
-			WorkTree:   worktree,
-		})
-		if err != nil {
-			log.Error("Unable to load attributes for %-v:%s. Error: %v", ctx.Repo.Repository, ctx.Repo.TreePath, err)
-		}
-
-		language = filename2attribute2info[ctx.Repo.TreePath]["linguist-language"]
-		if language == "" || language == "unspecified" {
-			language = filename2attribute2info[ctx.Repo.TreePath]["gitlab-language"]
-		}
-		if language == "unspecified" {
-			language = ""
-		}
 	}
+
 	lines := make([]string, 0)
 	rows := make([]*blameRow, 0)
 	escapeStatus := &charset.EscapeStatus{}

routers/web/repo/view.go

@@ -49,6 +49,7 @@ import (
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/routers/web/feed"
 	issue_service "code.gitea.io/gitea/services/issue"
+	files_service "code.gitea.io/gitea/services/repository/files"
 
 	"github.com/nektos/act/pkg/model"
 
@@ -557,31 +558,11 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry) {
 			}
 			ctx.Data["NumLinesSet"] = true
 
-			language := ""
+			language, err := files_service.TryGetContentLanguage(ctx.Repo.GitRepo, ctx.Repo.CommitID, ctx.Repo.TreePath)
-
+			if err != nil {
-			indexFilename, worktree, deleteTemporaryFile, err := ctx.Repo.GitRepo.ReadTreeToTemporaryIndex(ctx.Repo.CommitID)
+				log.Error("Unable to get file language for %-v:%s. Error: %v", ctx.Repo.Repository, ctx.Repo.TreePath, err)
-			if err == nil {
-				defer deleteTemporaryFile()
-
-				filename2attribute2info, err := ctx.Repo.GitRepo.CheckAttribute(git.CheckAttributeOpts{
-					CachedOnly: true,
-					Attributes: []string{"linguist-language", "gitlab-language"},
-					Filenames:  []string{ctx.Repo.TreePath},
-					IndexFile:  indexFilename,
-					WorkTree:   worktree,
-				})
-				if err != nil {
-					log.Error("Unable to load attributes for %-v:%s. Error: %v", ctx.Repo.Repository, ctx.Repo.TreePath, err)
-				}
-
-				language = filename2attribute2info[ctx.Repo.TreePath]["linguist-language"]
-				if language == "" || language == "unspecified" {
-					language = filename2attribute2info[ctx.Repo.TreePath]["gitlab-language"]
-				}
-				if language == "unspecified" {
-					language = ""
-				}
 			}
+
 			fileContent, lexerName, err := highlight.File(blob.Name(), language, buf)
 			ctx.Data["LexerName"] = lexerName
 			if err != nil {

services/repository/files/content.go

@@ -270,3 +270,34 @@ func GetBlobBySHA(ctx context.Context, repo *repo_model.Repository, gitRepo *git
 		Content:  content,
 	}, nil
 }
+
+// TryGetContentLanguage tries to get the (linguist) language of the file content
+func TryGetContentLanguage(gitRepo *git.Repository, commitID, treePath string) (string, error) {
+	indexFilename, worktree, deleteTemporaryFile, err := gitRepo.ReadTreeToTemporaryIndex(commitID)
+	if err != nil {
+		return "", err
+	}
+
+	defer deleteTemporaryFile()
+
+	filename2attribute2info, err := gitRepo.CheckAttribute(git.CheckAttributeOpts{
+		CachedOnly: true,
+		Attributes: []string{"linguist-language", "gitlab-language"},
+		Filenames:  []string{treePath},
+		IndexFile:  indexFilename,
+		WorkTree:   worktree,
+	})
+	if err != nil {
+		return "", err
+	}
+
+	language := filename2attribute2info[treePath]["linguist-language"]
+	if language == "" || language == "unspecified" {
+		language = filename2attribute2info[treePath]["gitlab-language"]
+	}
+	if language == "unspecified" {
+		language = ""
+	}
+
+	return language, nil
+}