OPML export

cry/cli.py

@@ -295,3 +295,19 @@ def serve():
 def sync():
     local_db = database.Database.local()
     database.sync(local_db)
+
+
+@cli.command(name="export")
+@click.argument("opml_file", type=click.File("wb"))
+def export_opml(opml_file):
+    "Export the specified OPML file."
+
+    db = database.Database.local()
+    feeds = db.load_all(feed_limit=0)
+    if len(feeds) == 0:
+        click.echo("Not subscribed to any feeds.")
+        return 0
+
+    feeds.sort(key=lambda f: f.title)
+
+    opml.write_opml(opml_file, feeds)

cry/opml.py

@@ -1,12 +1,30 @@
 import pathlib
-import xml.etree.ElementTree
+import xml.etree.ElementTree as ET
+
+from . import feed
 
 
 def parse_opml(opml: str) -> list[str]:
-    f = xml.etree.ElementTree.fromstring(opml)
+    f = ET.fromstring(opml)
     return [e.attrib["xmlUrl"] for e in f.iterfind(".//*[@xmlUrl]")]
 
 
 def load_opml(path: pathlib.Path) -> list[str]:
     with open(path, "r", encoding="utf-8") as f:
         return parse_opml(f.read())
+
+
+def write_opml(f, feeds: list[feed.Feed]):
+    root = ET.Element("opml", {"version": "2.0"})
+    body = ET.SubElement(root, "body")
+    head = ET.SubElement(root, "head")
+    title = ET.SubElement(head, "title")
+    title.text = "Exported from cry"
+
+    for feed in feeds:
+        ET.SubElement(
+            body,
+            "outline",
+            {"type": "rss", "text": feed.title, "xmlUrl": feed.meta.url},
+        )
+    ET.ElementTree(root).write(f)