Listall

plugins/labels.py

@@ -62,7 +62,8 @@ action_map = {
     "removeall": 2,
     "show": 3,
     "transfer": 4,
-    "edit": 5
+    "edit": 5,
+    "listall": 6,
 }
 
 def modify_labels(lib, opts, args):
@@ -86,6 +87,10 @@ def modify_labels(lib, opts, args):
         edit_labels(lib, opts, args[1:])
         return
 
+    if actnum == 6:  # listall
+        listall_labels(lib, opts, args[1:])
+        return
+
     if actnum >= 2:
         label = None
         query = args[1:]
@@ -104,6 +109,15 @@ def modify_labels(lib, opts, args):
     else:
         do_modify_labels(lib, items, label, actnum)
 
+def listall_labels(lib, opts, args):
+    """Print every distinct label key used across all items."""
+    all_labels = set()
+    for item in lib.items():
+        if LABELS_FIELD_NAME in item and item[LABELS_FIELD_NAME]:
+            all_labels.update(item[LABELS_FIELD_NAME].keys())
+    for label in sorted(all_labels):
+        print_(label)
+
 def transfer_labels(lib, opts, args):
     source_query = args[0]
     dest_query = args[1]
@@ -343,7 +357,8 @@ Actions:
   show [query]                  Display labels on items
   transfer <src-query> <dst-query>
                                 Copy labels from one item to another
-  edit [query]                  Open items' labels in a text editor"""
+  edit [query]                  Open items' labels in a text editor
+  listall                       List all label keys used in the library"""
 labels_command.func = modify_labels
 
 class HasLabelQuery(FieldQuery):