87 lines
2.4 KiB
Go
87 lines
2.4 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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"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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"maunium.net/go/mautrix/format/mdext"
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)
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const paragraphStart = "<p>"
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const paragraphEnd = "</p>"
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var Extensions = goldmark.WithExtensions(extension.Strikethrough, extension.Table, mdext.Spoiler)
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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(mdext.EscapeHTML))
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// UnwrapSingleParagraph removes paragraph tags surrounding a string if the string only contains a single paragraph.
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func UnwrapSingleParagraph(html string) string {
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html = strings.TrimRight(html, "\n")
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if strings.HasPrefix(html, paragraphStart) && strings.HasSuffix(html, paragraphEnd) {
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htmlBodyWithoutP := html[len(paragraphStart) : len(html)-len(paragraphEnd)]
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if !strings.Contains(htmlBodyWithoutP, paragraphStart) {
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return htmlBodyWithoutP
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}
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}
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return html
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}
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func RenderMarkdownCustom(text string, renderer goldmark.Markdown) event.MessageEventContent {
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var buf strings.Builder
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err := renderer.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 := UnwrapSingleParagraph(buf.String())
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return HTMLToContent(htmlBody)
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}
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func HTMLToContent(html string) event.MessageEventContent {
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text := HTMLToMarkdown(html)
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if html != text {
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return event.MessageEventContent{
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FormattedBody: html,
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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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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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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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return RenderMarkdownCustom(text, rndr)
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} else if allowHTML {
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htmlBody = strings.Replace(text, "\n", "<br>", -1)
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return HTMLToContent(htmlBody)
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} else {
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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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}
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