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render.go
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render.go
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//go:build !exclude_pages_formats && !exclude_pages_format_md
// Copyright (c) 2022 The Go-Enjin Authors
//
// 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 md
import (
"strings"
"github.com/gomarkdown/markdown"
mdHtml "github.com/gomarkdown/markdown/html"
mdParser "github.com/gomarkdown/markdown/parser"
"github.com/microcosm-cc/bluemonday"
"golang.org/x/net/html"
"github.com/go-corelibs/slices"
)
func PreRenderMarkdown(content string) (parsedBytes []byte) {
normalizedNewlines := markdown.NormalizeNewlines([]byte(content))
extensions := mdParser.CommonExtensions |
mdParser.AutoHeadingIDs |
mdParser.Strikethrough |
mdParser.Attributes |
mdParser.Footnotes |
mdParser.FencedCode |
mdParser.OrderedListStart
pageParser := mdParser.NewWithExtensions(extensions)
mdHtmlFlags := mdHtml.FootnoteReturnLinks
opts := mdHtml.RendererOptions{Flags: mdHtmlFlags}
pageRenderer := mdHtml.NewRenderer(opts)
parsedBytes = markdown.ToHTML(normalizedNewlines, pageParser, pageRenderer)
return
}
func RenderExcerpt(content string) (excerpt string) {
parsedBytes := PreRenderMarkdown(content)
policy := bluemonday.StrictPolicy()
policy.AllowComments()
sane := policy.SanitizeBytes(parsedBytes)
plain := string(sane)
if before, middle, _, found := slices.CarveString(plain, "<!--", "-->"); found {
if strings.ToLower(strings.TrimSpace(middle)) == "more" {
excerpt = strings.TrimPrefix(before, "<p>")
excerpt = html.UnescapeString(excerpt)
excerpt = strings.ReplaceAll(excerpt, "\n", " ")
excerpt = strings.TrimSpace(excerpt)
}
}
return
}
func RenderMarkdown(content string) (text string) {
parsedBytes := PreRenderMarkdown(content)
sanitizedBytes := bluemonday.UGCPolicy().SanitizeBytes(parsedBytes)
text = string(sanitizedBytes)
return
}