66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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// Copyright (c) 2022 Tulir Asokan
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package format
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import (
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"fmt"
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"regexp"
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"strings"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/renderer/html"
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"maunium.net/go/mautrix/event"
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)
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var AntiParagraphRegex = regexp.MustCompile("^<p>(.+?)</p>$")
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var Extensions = goldmark.WithExtensions(extension.Strikethrough, extension.Table, ExtensionSpoiler)
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var HTMLOptions = goldmark.WithRendererOptions(html.WithHardWraps(), html.WithUnsafe())
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var withHTML = goldmark.New(Extensions, HTMLOptions)
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var noHTML = goldmark.New(Extensions, HTMLOptions, goldmark.WithExtensions(ExtensionEscapeHTML))
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func RenderMarkdown(text string, allowMarkdown, allowHTML bool) event.MessageEventContent {
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var htmlBody string
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if allowMarkdown {
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rndr := withHTML
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if !allowHTML {
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rndr = noHTML
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}
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var buf strings.Builder
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err := rndr.Convert([]byte(text), &buf)
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if err != nil {
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panic(fmt.Errorf("markdown parser errored: %w", err))
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}
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htmlBody = strings.TrimRight(buf.String(), "\n")
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htmlBody = AntiParagraphRegex.ReplaceAllString(htmlBody, "$1")
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} else {
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htmlBody = strings.Replace(text, "\n", "<br>", -1)
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}
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if len(htmlBody) > 0 && (allowMarkdown || allowHTML) {
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text = HTMLToText(htmlBody)
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if htmlBody != text {
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return event.MessageEventContent{
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FormattedBody: htmlBody,
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Format: event.FormatHTML,
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MsgType: event.MsgText,
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Body: text,
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}
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}
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}
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return event.MessageEventContent{
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MsgType: event.MsgText,
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Body: text,
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}
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}
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