feat: Add OPML import functionality via CLIopml-import-cli

This change introduces the ability to import feeds from an OPML file
using a command-line interface.

Key features:
- New `--import-opml` (or `-I`) flag in `main.go` to specify the
  OPML file path.
- The `importer.ImportOPML` function in `importer/importer.go` handles
  the parsing of the OPML file (using `github.com/gilliek/go-opml`)
  and addition of new feeds to the database.
- Recursive processing of OPML outlines allows for importing feeds
  nested within folders.
- Feeds are identified by their XML URL; existing feeds with the
  same URL are skipped to avoid duplicates.
- Title extraction prioritizes the `title` attribute, then the `text`
  attribute of an outline, and falls back to "Untitled Feed".

Comprehensive unit tests have been added in `importer/importer_test.go`
to verify:
- Correct parsing and importing of various OPML structures.
- Proper handling of duplicate feeds (skipping).
- Correct title extraction logic.
- Database interaction and cleanup.

1 files changed, 9 insertions, 1 deletions

diff --git a/main.go b/main.go
index d121deb..4525846 100644
--- a/main.go
+++ b/main.go
@@ -4,6 +4,7 @@ import (
 	"adammathes.com/neko/config"
 	"adammathes.com/neko/crawler"
 	"adammathes.com/neko/exporter"
+	"adammathes.com/neko/importer"
 	"adammathes.com/neko/models"
 	"adammathes.com/neko/models/feed"
 	"adammathes.com/neko/vlog"
@@ -17,7 +18,7 @@ var Version, Build string
 
 func main() {
 	var help, update, verbose, proxyImages bool
-	var configFile, dbfile, newFeed, export, password string
+	var configFile, dbfile, newFeed, export, password, importOPMLFile string
 	var port, minutes int
 
 	// config file
@@ -28,6 +29,7 @@ func main() {
 	flag.BoolVarP(&update, "update", "u", false, "fetch feeds and store new items")
 	flag.StringVarP(&newFeed, "add", "a", "", "add the feed at URL `http://example.com/rss.xml`")
 	flag.StringVarP(&export, "export", "x", "", "export feed. format required: text, opml, html, or json")
+	flag.StringVarP(&importOPMLFile, "import-opml", "I", "", "import feeds from an OPML file at `filepath`")
 
 	// options -- defaults are set in config/main.go and overridden by cmd line
 	flag.StringVarP(&dbfile, "database", "d", "", "sqlite database file")
@@ -72,6 +74,12 @@ func main() {
 
 	models.InitDB()
 
+	if importOPMLFile != "" {
+		vlog.Printf("importing feeds from OPML file %s\n", importOPMLFile)
+		importer.ImportOPML(importOPMLFile)
+		return // Exit after import
+	}
+
 	if update {
 		vlog.Printf("starting crawl\n")
 		crawler.Crawl()