respect 'output.private' in '-K/--list-keywords' output

docs/configuration.rst

@@ -2792,16 +2792,6 @@ Output Options
 ==============
 
 
-output.fallback
----------------
-Type
-    ``bool``
-Default
-    ``true``
-Description
-    Include fallback URLs in the output of ``-g/--get-urls``.
-
-
 output.mode
 -----------
 Type
@@ -2842,6 +2832,28 @@ Description
     Show skipped file downloads.
 
 
+output.fallback
+---------------
+Type
+    ``bool``
+Default
+    ``true``
+Description
+    Include fallback URLs in the output of ``-g/--get-urls``.
+
+
+output.private
+--------------
+Type
+    ``bool``
+Default
+    ``false``
+Description
+    Include private fields,
+    i.e. fields whose name starts with an underscore,
+    in the output of ``-K/--list-keywords`` and ``-j/--dump-json``.
+
+
 output.progress
 ---------------
 Type

gallery_dl/job.py

@@ -532,6 +532,10 @@ class SimulationJob(DownloadJob):
 class KeywordJob(Job):
     """Print available keywords"""
 
+    def __init__(self, url, parent=None):
+        Job.__init__(self, url, parent)
+        self.private = config.get(("output",), "private")
+
     def handle_url(self, url, kwdict):
         print("\nKeywords for filenames and --filter:")
         print("------------------------------------")
@@ -569,21 +573,20 @@ class KeywordJob(Job):
                 KeywordJob(extr or url, self).run()
         raise exception.StopExtraction()
 
-    @staticmethod
-    def print_kwdict(kwdict, prefix=""):
+    def print_kwdict(self, kwdict, prefix=""):
         """Print key-value pairs in 'kwdict' with formatting"""
         suffix = "]" if prefix else ""
         for key, value in sorted(kwdict.items()):
-            if key[0] == "_":
+            if key[0] == "_" and not self.private:
                 continue
             key = prefix + key + suffix
 
             if isinstance(value, dict):
-                KeywordJob.print_kwdict(value, key + "[")
+                self.print_kwdict(value, key + "[")
 
             elif isinstance(value, list):
                 if value and isinstance(value[0], dict):
-                    KeywordJob.print_kwdict(value[0], key + "[][")
+                    self.print_kwdict(value[0], key + "[][")
                 else:
                     print(key, "[]", sep="")
                     for val in value: