Refactor renders (#15175)

* Refactor renders

* Some performance optimization

* Fix comment

* Transform reader

* Fix csv test

* Fix test

* Fix tests

* Improve optimaziation

* Fix test

* Fix test

* Detect file encoding with reader

* Improve optimaziation

* reduce memory usage

* improve code

* fix build

* Fix test

* Fix for go1.15

* Fix render

* Fix comment

* Fix lint

* Fix test

* Don't use NormalEOF when unnecessary

* revert change on util.go

* Apply suggestions from code review

Co-authored-by: zeripath <art27@cantab.net>

* rename function

* Take NormalEOF back

Co-authored-by: zeripath <art27@cantab.net>

models/repo.go

@@ -863,7 +863,10 @@ func (repo *Repository) getUsersWithAccessMode(e Engine, mode AccessMode) (_ []*
 
 // DescriptionHTML does special handles to description and return HTML string.
 func (repo *Repository) DescriptionHTML() template.HTML {
-	desc, err := markup.RenderDescriptionHTML([]byte(repo.Description), repo.HTMLURL(), repo.ComposeMetas())
+	desc, err := markup.RenderDescriptionHTML(&markup.RenderContext{
+		URLPrefix: repo.HTMLURL(),
+		Metas:     repo.ComposeMetas(),
+	}, repo.Description)
 	if err != nil {
 		log.Error("Failed to render description for %s (ID: %d): %v", repo.Name, repo.ID, err)
 		return template.HTML(markup.Sanitize(repo.Description))