Revert "tpl: Rework to handle both text and HTML templates"

Will have to take another stab at this ...

This reverts commit 5c5efa03d2.

Closes #3260

tpl/tplimpl/templateFuncster.go

@@ -1,86 +0,0 @@
-// Copyright 2017-present The Hugo Authors. All rights reserved.
-//
-// 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 tplimpl
-
-import (
-	"fmt"
-	"html/template"
-	"strings"
-
-	bp "github.com/spf13/hugo/bufferpool"
-
-	"image"
-
-	"github.com/spf13/hugo/deps"
-)
-
-// Some of the template funcs are'nt entirely stateless.
-type templateFuncster struct {
-	funcMap        template.FuncMap
-	cachedPartials partialCache
-	image          *imageHandler
-
-	// Make sure each funcster gets its own TemplateFinder to get
-	// proper text and HTML template separation.
-	Tmpl templateFuncsterTemplater
-
-	*deps.Deps
-}
-
-func newTemplateFuncster(deps *deps.Deps, t templateFuncsterTemplater) *templateFuncster {
-	return &templateFuncster{
-		Deps:           deps,
-		Tmpl:           t,
-		cachedPartials: partialCache{p: make(map[string]interface{})},
-		image:          &imageHandler{fs: deps.Fs, imageConfigCache: map[string]image.Config{}},
-	}
-}
-
-// Partial executes the named partial and returns either a string,
-// when called from text/template, for or a template.HTML.
-func (t *templateFuncster) partial(name string, contextList ...interface{}) (interface{}, error) {
-	if strings.HasPrefix("partials/", name) {
-		name = name[8:]
-	}
-	var context interface{}
-
-	if len(contextList) == 0 {
-		context = nil
-	} else {
-		context = contextList[0]
-	}
-
-	for _, n := range []string{"partials/" + name, "theme/partials/" + name} {
-		templ := t.Tmpl.Lookup(n)
-		if templ != nil {
-			b := bp.GetBuffer()
-			defer bp.PutBuffer(b)
-
-			if err := templ.Execute(b, context); err != nil {
-				return "", err
-			}
-
-			switch t.Tmpl.(type) {
-			case *htmlTemplates:
-				return template.HTML(b.String()), nil
-			case *textTemplates:
-				return b.String(), nil
-			default:
-				panic("Unknown type")
-			}
-		}
-	}
-
-	return "", fmt.Errorf("Partial %q not found", name)
-}