Refactor readme file renderer (#19502)

* Refactor readme file renderer

* improve

routers/web/repo/view.go

@@ -146,6 +146,21 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 		ctx.Data["Title"] = ctx.Tr("repo.file.title", ctx.Repo.Repository.Name+"/"+path.Base(ctx.Repo.TreePath), ctx.Repo.RefName)
 	}
 
+	// Check permission to add or upload new file.
+	if ctx.Repo.CanWrite(unit_model.TypeCode) && ctx.Repo.IsViewBranch {
+		ctx.Data["CanAddFile"] = !ctx.Repo.Repository.IsArchived
+		ctx.Data["CanUploadFile"] = setting.Repository.Upload.Enabled && !ctx.Repo.Repository.IsArchived
+	}
+
+	readmeFile, readmeTreelink := findReadmeFile(ctx, entries, treeLink)
+	if ctx.Written() || readmeFile == nil {
+		return
+	}
+
+	renderReadmeFile(ctx, readmeFile, readmeTreelink)
+}
+
+func findReadmeFile(ctx *context.Context, entries git.Entries, treeLink string) (*namedBlob, string) {
 	// 3 for the extensions in exts[] in order
 	// the last one is for a readme that doesn't
 	// strictly match an extension
@@ -183,7 +198,7 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 					target, err = entry.FollowLinks()
 					if err != nil && !git.IsErrBadLink(err) {
 						ctx.ServerError("FollowLinks", err)
-						return
+						return nil, ""
 					}
 				}
 				log.Debug("%t", target == nil)
@@ -205,7 +220,7 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 				entry, err = entry.FollowLinks()
 				if err != nil && !git.IsErrBadLink(err) {
 					ctx.ServerError("FollowLinks", err)
-					return
+					return nil, ""
 				}
 			}
 			if entry != nil && (entry.IsExecutable() || entry.IsRegular()) {
@@ -236,7 +251,7 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 			readmeFile, err = getReadmeFileFromPath(ctx.Repo.Commit, entry.GetSubJumpablePathName())
 			if err != nil {
 				ctx.ServerError("getReadmeFileFromPath", err)
-				return
+				return nil, ""
 			}
 			if readmeFile != nil {
 				readmeFile.name = entry.Name() + "/" + readmeFile.name
@@ -245,8 +260,10 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 			}
 		}
 	}
+	return readmeFile, readmeTreelink
+}
 
-	if readmeFile != nil {
+func renderReadmeFile(ctx *context.Context, readmeFile *namedBlob, readmeTreelink string) {
 	ctx.Data["RawFileLink"] = ""
 	ctx.Data["ReadmeInList"] = true
 	ctx.Data["ReadmeExist"] = true
@@ -314,17 +331,22 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 		}
 	}
 
+	if !isTextFile {
+		return
+	}
+
 	if !isLFSFile {
 		fileSize = readmeFile.blob.Size()
 	}
 
-		if isTextFile {
 	if fileSize >= setting.UI.MaxDisplayFileSize {
 		// Pretend that this is a normal text file to display 'This file is too large to be shown'
 		ctx.Data["IsFileTooLarge"] = true
 		ctx.Data["IsTextFile"] = true
 		ctx.Data["FileSize"] = fileSize
-			} else {
+		return
+	}
+
 	rd := charset.ToUTF8WithFallbackReader(io.MultiReader(bytes.NewReader(buf), dataRc))
 
 	if markupType := markup.Type(readmeFile.name); markupType != "" {
@@ -361,15 +383,6 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 		)
 	}
 }
-		}
-	}
-
-	// Check permission to add or upload new file.
-	if ctx.Repo.CanWrite(unit_model.TypeCode) && ctx.Repo.IsViewBranch {
-		ctx.Data["CanAddFile"] = !ctx.Repo.Repository.IsArchived
-		ctx.Data["CanUploadFile"] = setting.Repository.Upload.Enabled && !ctx.Repo.Repository.IsArchived
-	}
-}
 
 func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink string) {
 	ctx.Data["IsViewFile"] = true