65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package richtext
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import "strings"
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// Changed reports whether inbound markdown differs semantically from stored
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// rich-text HTML, so callers can skip rewriting unchanged fields (avoids CalDAV
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// read-modify-write churning the HTML and bumping Updated). Both sides are
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// canonicalized to markdown before comparing: HTML→markdown isn't an identity, so
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// an HTML-domain compare would always report "changed". Errs to true.
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func Changed(storedHTML, incomingMarkdown string) bool {
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stored, err := HTMLToMarkdown(storedHTML)
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if err != nil {
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return true
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}
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incoming, err := canonicalMarkdown(incomingMarkdown)
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if err != nil {
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return true
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}
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return normalizeMarkdown(stored) != normalizeMarkdown(incoming)
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}
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// HTMLIsEmpty treats "", "<p></p>" and whitespace-only markup as empty.
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func HTMLIsEmpty(htmlInput string) bool {
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md, err := HTMLToMarkdown(htmlInput)
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if err != nil {
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return false
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}
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return md == ""
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}
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// canonicalMarkdown round-trips markdown through HTML so it matches the shape
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// HTMLToMarkdown yields from stored HTML. No session needed: a <mention-user> tag
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// and an inbound "@username" both reduce to "@username".
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func canonicalMarkdown(md string) (string, error) {
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h, err := MarkdownToHTML(md)
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if err != nil {
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return "", err
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}
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return HTMLToMarkdown(h)
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}
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func normalizeMarkdown(md string) string {
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md = strings.ReplaceAll(md, "\r\n", "\n")
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md = strings.ReplaceAll(md, "\r", "\n")
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return strings.TrimSpace(md)
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}
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