mirror of
https://github.com/go-vikunja/vikunja.git
synced 2026-07-16 06:42:23 -05:00
9015bad65c
Changed reports whether inbound markdown differs from stored HTML by comparing in the markdown domain, so callers can skip rewriting unchanged fields.
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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