liturgy: sigla harvest + offline load

1 files changed, 16 insertions, 4 deletions

diff --git a/internal/liturgy/fetch.go b/internal/liturgy/fetch.go
index 1b1458f..d6cc4b6 100644
--- a/internal/liturgy/fetch.go
+++ b/internal/liturgy/fetch.go
@@ -32,9 +32,8 @@ type Options struct {
 	Date string
 	// Refresh bypasses both cache layers and re-fetches from the network.
 	Refresh bool
-	// Offline restricts Load to previously cached/harvested data, never
-	// hitting the network. Its behavior is added in a later task; for now
-	// it is a no-op on the modern-source path.
+	// Offline restricts Load to previously cached/harvested data (see
+	// LoadOffline), never hitting the network.
 	Offline bool
 }
 
@@ -55,12 +54,20 @@ func cacheDir() string {
 // Load returns the day's reading sections, from the modern (niedziela.pl)
 // source, preferring cache over network:
 //
+//  0. If Offline, skip straight to LoadOffline (the harvested sigla TSV).
 //  1. Unless Refresh, the parsed JSON cache ({date}.json).
 //  2. Unless Refresh, the raw HTML cache ({date}.html) -- parsed, and the
 //     result written to the JSON cache for next time.
 //  3. Otherwise, fetch the page over the network, parse it, and -- only if
-//     the page is fully published -- write both cache layers.
+//     the page is fully published -- write both cache layers. A fetch error
+//     here (e.g. no network) falls back to LoadOffline for this date if it
+//     has been harvested, and only surfaces the original fetch error if
+//     that fallback also fails.
 func Load(opts Options) ([]Section, error) {
+	if opts.Offline {
+		return LoadOffline(opts.Date)
+	}
+
 	dir := cacheDir()
 	jsonPath := filepath.Join(dir, opts.Date+".json")
 	htmlPath := filepath.Join(dir, opts.Date+".html")
@@ -81,6 +88,11 @@ func Load(opts Options) ([]Section, error) {
 
 	page, err := fetch(opts.Date)
 	if err != nil {
+		// Network is unreachable: fall back to a prior harvest of this date
+		// if there is one, rather than failing outright.
+		if secs, offErr := LoadOffline(opts.Date); offErr == nil {
+			return secs, nil
+		}
 		return nil, err
 	}