Write subscriptions

core/entries.go

@@ -0,0 +1,109 @@
+// Copyright (C) 2021 nytpu
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// For more license details, see LICENSE or <https://www.gnu.org/licenses/agpl-3.0.html>.
+
+// This file incorporates code from makeworld's amfora:
+// https://github.com/makeworld-the-better-one/amfora/blob/master/subscriptions/structs.go
+// Original source is Copyright 2020 makeworld and is licensed under the
+// terms of the GNU General Public License Version 3.0.
+// https://www.gnu.org/licenses/gpl-3.0-standalone.html
+
+package core
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"time"
+)
+
+// getPageEntries returns a full list of page entries from a FullData.  It will
+// always be sorted from newest to oldest.
+func (d *FullData) getPageEntries() *PageEntries {
+	var pe PageEntries
+
+	d.RLock()
+	for _, feed := range d.Feeds {
+		for _, item := range feed.Items {
+			// Ignore items without links
+			if item.Link == "" {
+				continue
+			}
+
+			var prefix string
+			if feed.Title != "" {
+				prefix = feed.Title
+			} else {
+				prefix = feed.Link
+			}
+			pe.Entries = append(pe.Entries, &PageEntry{
+				Prefix:    prefix,
+				Title:     item.Title,
+				Published: item.Published,
+				URL:       item.Link,
+			})
+		}
+	}
+	for _, page := range d.Pages {
+		var prefix string
+		if page.Title != "" {
+			prefix = page.Title
+		} else {
+			prefix = page.Link
+		}
+		pe.Entries = append(pe.Entries, &PageEntry{
+			Prefix:    prefix,
+			Published: page.Updated,
+			URL:       page.Link,
+		})
+	}
+	d.RUnlock()
+
+	sort.Sort(&pe)
+	return &pe
+}
+
+// toLocalDay truncates the provided time to a date only, but converts to the
+// local time first.
+func toLocalDay(t time.Time) time.Time {
+	t = t.Local()
+	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
+}
+
+func (d *FullData) WriteSubs(dataPath string) error {
+	path := filepath.Join(dataPath, "subscriptions.gmi.new")
+
+	d.RLock()
+	pe := d.getPageEntries()
+	d.RUnlock()
+
+	rawPage := "# Subscriptions"
+
+	if len(pe.Entries) > 0 {
+		curDay := toLocalDay(pe.Entries[0].Published)
+		rawPage += fmt.Sprintf("\n\n## %s\n\n", curDay.Format("2006-01-02"))
+		for _, entry := range pe.Entries {
+			// get just the date it was published
+			pub := toLocalDay(entry.Published)
+			if pub.Before(curDay) {
+				curDay = pub
+				rawPage += fmt.Sprintf("\n## %s\n\n", curDay.Format("2006-01-02"))
+			}
+
+			if entry.Title == "" {
+				rawPage += fmt.Sprintf("=> %s %s\n", entry.URL, entry.Prefix)
+			} else {
+				rawPage += fmt.Sprintf("=> %s %s — %s\n", entry.URL, entry.Prefix, entry.Title)
+			}
+		}
+	}
+
+	err := os.WriteFile(path, []byte(rawPage), 0666)
+	if err != nil {
+		return err
+	}
+	// if full write was successful then overwrite original
+	err = os.Rename(path, filepath.Join(dataPath, "subscriptions.gmi"))
+	return err
+}