Markdown Statuses (#116)

* parse markdown statuses if desired

* add some preliminary docs for writing posts

internal/text/markdown.go

@@ -0,0 +1,58 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package text
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/russross/blackfriday/v2"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+var bfExtensions = blackfriday.NoIntraEmphasis |
+	blackfriday.FencedCode |
+	blackfriday.Autolink |
+	blackfriday.Strikethrough |
+	blackfriday.SpaceHeadings |
+	blackfriday.BackslashLineBreak
+
+func (f *formatter) FromMarkdown(md string, mentions []*gtsmodel.Mention, tags []*gtsmodel.Tag) string {
+	content := preformat(md)
+
+	// do the markdown parsing *first*
+	content = string(blackfriday.Run([]byte(content), blackfriday.WithExtensions(bfExtensions)))
+
+	// format mentions nicely
+	for _, menchie := range mentions {
+		targetAccount := &gtsmodel.Account{}
+		if err := f.db.GetByID(menchie.TargetAccountID, targetAccount); err == nil {
+			mentionContent := fmt.Sprintf(`<span class="h-card"><a href="%s" class="u-url mention">@<span>%s</span></a></span>`, targetAccount.URL, targetAccount.Username)
+			content = strings.ReplaceAll(content, menchie.NameString, mentionContent)
+		}
+	}
+
+	// format tags nicely
+	for _, tag := range tags {
+		tagContent := fmt.Sprintf(`<a href="%s" class="mention hashtag" rel="tag">#<span>%s</span></a>`, tag.URL, tag.Name)
+		content = strings.ReplaceAll(content, fmt.Sprintf("#%s", tag.Name), tagContent)
+	}
+
+	return postformat(content)
+}