Refactor markup render system (#32589)

This PR mainly moves some code and introduces `RenderContext.WithXxx`
functions

modules/csv/csv.go

@@ -7,7 +7,7 @@ import (
 	"bytes"
 	stdcsv "encoding/csv"
 	"io"
-	"path/filepath"
+	"path"
 	"regexp"
 	"strings"
 
@@ -53,7 +53,7 @@ func CreateReaderAndDetermineDelimiter(ctx *markup.RenderContext, rd io.Reader)
 func determineDelimiter(ctx *markup.RenderContext, data []byte) rune {
 	extension := ".csv"
 	if ctx != nil {
-		extension = strings.ToLower(filepath.Ext(ctx.RelativePath))
+		extension = strings.ToLower(path.Ext(ctx.RenderOptions.RelativePath))
 	}
 
 	var delimiter rune

modules/csv/csv_test.go

@@ -5,13 +5,13 @@ package csv
 
 import (
 	"bytes"
+	"context"
 	"encoding/csv"
 	"io"
 	"strconv"
 	"strings"
 	"testing"
 
-	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/translation"
 
@@ -231,10 +231,7 @@ John Doe	john@doe.com	This,note,had,a,lot,of,commas,to,test,delimiters`,
 	}
 
 	for n, c := range cases {
-		delimiter := determineDelimiter(&markup.RenderContext{
-			Ctx:          git.DefaultContext,
-			RelativePath: c.filename,
-		}, []byte(decodeSlashes(t, c.csv)))
+		delimiter := determineDelimiter(markup.NewRenderContext(context.Background()).WithRelativePath(c.filename), []byte(decodeSlashes(t, c.csv)))
 		assert.EqualValues(t, c.expectedDelimiter, delimiter, "case %d: delimiter should be equal, expected '%c' got '%c'", n, c.expectedDelimiter, delimiter)
 	}
 }