Support to list snapshot

api/__init__.py

@@ -8,6 +8,7 @@ from .database import API_ADD, API_UPDATE, API_DELETE
 from .database import ChangeSet
 from .database import get_current_operation
 from .database import execute_undo, execute_redo
+from .database import list_snapshot
 from .database import have_snapshot, have_snapshot_for_operation, have_snapshot_for_current_operation
 from .database import take_snapshot_for_operation, take_snapshot_for_current_operation, take_snapshot
 from .database import update_snapshot, update_snapshot_for_current_operation

api/database.py

@@ -162,6 +162,14 @@ def execute_redo(name: str) -> ChangeSet:
     return ChangeSet.from_list(e)
 
 
+def list_snapshot(name: str) -> list[tuple[int, str]]:
+    rows = read_all(name, f'select * from operation order by id')
+    result = []
+    for row in rows:
+        result.append((int(row['id']), str(row['tag'])))
+    return result
+
+
 def have_snapshot(name: str, tag: str) -> bool:
     return read(name, f"select id from snapshot_operation where tag = '{tag}'") != None
 

tjnetwork.py

@@ -173,6 +173,9 @@ def execute_undo(name: str, discard: bool = False) -> ChangeSet:
 def execute_redo(name: str) -> ChangeSet:
     return api.execute_redo(name)
 
+def list_snapshot(name: str) -> list[tuple[int, str]]:
+    return api.list_snapshot(name)
+
 def have_snapshot(name: str, tag: str) -> bool:
     return api.have_snapshot(name, tag)