[utils] Add `deprecation_warning`

See https://github.com/yt-dlp/yt-dlp/pull/2173#issuecomment-1097021515

yt_dlp/YoutubeDL.py

@@ -90,6 +90,7 @@ from .utils import (
     args_to_str,
     bug_reports_message,
     date_from_str,
+    deprecation_warning,
     determine_ext,
     determine_protocol,
     encode_compat_str,
@@ -631,7 +632,7 @@ class YoutubeDL:
         for msg in self.params.get('_warnings', []):
             self.report_warning(msg)
         for msg in self.params.get('_deprecation_warnings', []):
-            self.deprecation_warning(msg)
+            self.deprecated_feature(msg)
 
         self.params['compat_opts'] = set(self.params.get('compat_opts', ()))
         if 'list-formats' in self.params['compat_opts']:
@@ -835,9 +836,11 @@ class YoutubeDL:
     def to_stdout(self, message, skip_eol=False, quiet=None):
         """Print message to stdout"""
         if quiet is not None:
-            self.deprecation_warning('"YoutubeDL.to_stdout" no longer accepts the argument quiet. Use "YoutubeDL.to_screen" instead')
+            self.deprecation_warning('"YoutubeDL.to_stdout" no longer accepts the argument quiet. '
+                                     'Use "YoutubeDL.to_screen" instead')
         if skip_eol is not False:
-            self.deprecation_warning('"YoutubeDL.to_stdout" no longer accepts the argument skip_eol. Use "YoutubeDL.to_screen" instead')
+            self.deprecation_warning('"YoutubeDL.to_stdout" no longer accepts the argument skip_eol. '
+                                     'Use "YoutubeDL.to_screen" instead')
         self._write_string(f'{self._bidi_workaround(message)}\n', self._out_files.out)
 
     def to_screen(self, message, skip_eol=False, quiet=None):
@@ -973,11 +976,14 @@ class YoutubeDL:
                 return
             self.to_stderr(f'{self._format_err("WARNING:", self.Styles.WARNING)} {message}', only_once)
 
-    def deprecation_warning(self, message):
+    def deprecation_warning(self, message, *, stacklevel=0):
+        deprecation_warning(
+            message, stacklevel=stacklevel + 1, printer=self.report_error, is_error=False)
+
+    def deprecated_feature(self, message):
         if self.params.get('logger') is not None:
-            self.params['logger'].warning(f'DeprecationWarning: {message}')
+            self.params['logger'].warning(f'Deprecated Feature: {message}')
-        else:
+        self.to_stderr(f'{self._format_err("Deprecated Feature:", self.Styles.ERROR)} {message}', True)
-            self.to_stderr(f'{self._format_err("DeprecationWarning:", self.Styles.ERROR)} {message}', True)
 
     def report_error(self, message, *args, **kwargs):
         '''

yt_dlp/__init__.py

@@ -63,6 +63,8 @@ from .utils import (
 )
 from .YoutubeDL import YoutubeDL
 
+_IN_CLI = False
+
 
 def _exit(status=0, *args):
     for msg in args:

yt_dlp/__main__.py

@@ -14,4 +14,5 @@ if __package__ is None and not hasattr(sys, 'frozen'):
 import yt_dlp
 
 if __name__ == '__main__':
+    yt_dlp._IN_CLI = True
     yt_dlp.main()

yt_dlp/downloader/common.py

@@ -92,6 +92,7 @@ class FileDownloader:
 
         for func in (
             'deprecation_warning',
+            'deprecated_feature',
             'report_error',
             'report_file_already_downloaded',
             'report_warning',

yt_dlp/downloader/fragment.py

@@ -65,8 +65,8 @@ class FragmentFD(FileDownloader):
     """
 
     def report_retry_fragment(self, err, frag_index, count, retries):
-        self.deprecation_warning(
+        self.deprecation_warning('yt_dlp.downloader.FragmentFD.report_retry_fragment is deprecated. '
-            'yt_dlp.downloader.FragmentFD.report_retry_fragment is deprecated. Use yt_dlp.downloader.FileDownloader.report_retry instead')
+                                 'Use yt_dlp.downloader.FileDownloader.report_retry instead')
         return self.report_retry(err, count, retries, frag_index)
 
     def report_skip_fragment(self, frag_index, err=None):

yt_dlp/extractor/common.py

@@ -1766,9 +1766,8 @@ class InfoExtractor:
             if field not in self.settings:
                 if key in ('forced', 'priority'):
                     return False
-                self.ydl.deprecation_warning(
+                self.ydl.deprecated_feature(f'Using arbitrary fields ({field}) for format sorting is '
-                    f'Using arbitrary fields ({field}) for format sorting is deprecated '
+                                            'deprecated and may be removed in a future version')
-                    'and may be removed in a future version')
                 self.settings[field] = {}
             propObj = self.settings[field]
             if key not in propObj:
@@ -1853,9 +1852,8 @@ class InfoExtractor:
                 if self._get_field_setting(field, 'type') == 'alias':
                     alias, field = field, self._get_field_setting(field, 'field')
                     if self._get_field_setting(alias, 'deprecated'):
-                        self.ydl.deprecation_warning(
+                        self.ydl.deprecated_feature(f'Format sorting alias {alias} is deprecated and may '
-                            f'Format sorting alias {alias} is deprecated '
+                                                    'be removed in a future version. Please use {field} instead')
-                            f'and may be removed in a future version. Please use {field} instead')
                 reverse = match.group('reverse') is not None
                 closest = match.group('separator') == '~'
                 limit_text = match.group('limit')

yt_dlp/extractor/youtube.py

@@ -2959,8 +2959,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         # YouTube comments have a max depth of 2
         max_depth = int_or_none(get_single_config_arg('max_comment_depth'))
         if max_depth:
-            self._downloader.deprecation_warning(
+            self._downloader.deprecated_feature('[youtube] max_comment_depth extractor argument is deprecated. '
-                '[youtube] max_comment_depth extractor argument is deprecated. Set max replies in the max-comments extractor argument instead.')
+                                                'Set max replies in the max-comments extractor argument instead')
         if max_depth == 1 and parent:
             return
 

yt_dlp/options.py

@@ -25,6 +25,7 @@ from .utils import (
     OUTTMPL_TYPES,
     POSTPROCESS_WHEN,
     Config,
+    deprecation_warning,
     expand_path,
     format_field,
     get_executable_path,
@@ -1864,7 +1865,6 @@ def create_parser():
 
 
 def _hide_login_info(opts):
-    write_string(
+    deprecation_warning(f'"{__name__}._hide_login_info" is deprecated and may be removed '
-        'DeprecationWarning: "yt_dlp.options._hide_login_info" is deprecated and may be removed in a future version. '
+                        'in a future version. Use "yt_dlp.utils.Config.hide_login_info" instead')
-        'Use "yt_dlp.utils.Config.hide_login_info" instead\n')
     return Config.hide_login_info(opts)

yt_dlp/postprocessor/common.py

@@ -7,10 +7,10 @@ from ..utils import (
     PostProcessingError,
     RetryManager,
     _configuration_args,
+    deprecation_warning,
     encodeFilename,
     network_exceptions,
     sanitized_Request,
-    write_string,
 )
 
 
@@ -73,10 +73,14 @@ class PostProcessor(metaclass=PostProcessorMetaClass):
         if self._downloader:
             return self._downloader.report_warning(text, *args, **kwargs)
 
-    def deprecation_warning(self, text):
+    def deprecation_warning(self, msg):
+        warn = getattr(self._downloader, 'deprecation_warning', deprecation_warning)
+        return warn(msg, stacklevel=1)
+
+    def deprecated_feature(self, msg):
         if self._downloader:
-            return self._downloader.deprecation_warning(text)
+            return self._downloader.deprecated_feature(msg)
-        write_string(f'DeprecationWarning: {text}')
+        return deprecation_warning(msg, stacklevel=1)
 
     def report_error(self, text, *args, **kwargs):
         self.deprecation_warning('"yt_dlp.postprocessor.PostProcessor.report_error" is deprecated. '

yt_dlp/postprocessor/ffmpeg.py

@@ -15,6 +15,7 @@ from ..utils import (
     Popen,
     PostProcessingError,
     _get_exe_version_output,
+    deprecation_warning,
     detect_exe_version,
     determine_ext,
     dfxp2srt,
@@ -30,7 +31,6 @@ from ..utils import (
     traverse_obj,
     variadic,
     write_json_file,
-    write_string,
 )
 
 EXT_TO_OUT_FORMATS = {
@@ -187,8 +187,8 @@ class FFmpegPostProcessor(PostProcessor):
         else:
             self.probe_basename = basename
         if basename == self._ffmpeg_to_avconv[kind]:
-            self.deprecation_warning(
+            self.deprecated_feature(f'Support for {self._ffmpeg_to_avconv[kind]} is deprecated and '
-                f'Support for {self._ffmpeg_to_avconv[kind]} is deprecated and may be removed in a future version. Use {kind} instead')
+                                    f'may be removed in a future version. Use {kind} instead')
         return version
 
     @functools.cached_property
@@ -1064,7 +1064,7 @@ class FFmpegThumbnailsConvertorPP(FFmpegPostProcessor):
 
     @classmethod
     def is_webp(cls, path):
-        write_string(f'DeprecationWarning: {cls.__module__}.{cls.__name__}.is_webp is deprecated')
+        deprecation_warning(f'{cls.__module__}.{cls.__name__}.is_webp is deprecated')
         return imghdr.what(path) == 'webp'
 
     def fixup_webp(self, info, idx=-1):

yt_dlp/update.py

@@ -14,6 +14,7 @@ from .compat import compat_realpath, compat_shlex_quote
 from .utils import (
     Popen,
     cached_method,
+    deprecation_warning,
     shell_quote,
     system_identifier,
     traverse_obj,
@@ -302,11 +303,8 @@ def run_update(ydl):
 def update_self(to_screen, verbose, opener):
     import traceback
 
-    from .utils import write_string
+    deprecation_warning(f'"{__name__}.update_self" is deprecated and may be removed '
-
+                        f'in a future version. Use "{__name__}.run_update(ydl)" instead')
-    write_string(
-        'DeprecationWarning: "yt_dlp.update.update_self" is deprecated and may be removed in a future version. '
-        'Use "yt_dlp.update.run_update(ydl)" instead\n')
 
     printfn = to_screen
 

yt_dlp/utils.py

@@ -828,8 +828,8 @@ def escapeHTML(text):
 
 
 def process_communicate_or_kill(p, *args, **kwargs):
-    write_string('DeprecationWarning: yt_dlp.utils.process_communicate_or_kill is deprecated '
+    deprecation_warning(f'"{__name__}.process_communicate_or_kill" is deprecated and may be removed '
-                 'and may be removed in a future version. Use yt_dlp.utils.Popen.communicate_or_kill instead')
+                        f'in a future version. Use "{__name__}.Popen.communicate_or_kill" instead')
     return Popen.communicate_or_kill(p, *args, **kwargs)
 
 
@@ -1934,7 +1934,7 @@ class DateRange:
 
 def platform_name():
     """ Returns the platform name as a str """
-    write_string('DeprecationWarning: yt_dlp.utils.platform_name is deprecated, use platform.platform instead')
+    deprecation_warning(f'"{__name__}.platform_name" is deprecated, use "platform.platform" instead')
     return platform.platform()
 
 
@@ -1980,6 +1980,23 @@ def write_string(s, out=None, encoding=None):
     out.flush()
 
 
+def deprecation_warning(msg, *, printer=None, stacklevel=0, **kwargs):
+    from . import _IN_CLI
+    if _IN_CLI:
+        if msg in deprecation_warning._cache:
+            return
+        deprecation_warning._cache.add(msg)
+        if printer:
+            return printer(f'{msg}{bug_reports_message()}', **kwargs)
+        return write_string(f'ERROR: {msg}{bug_reports_message()}\n', **kwargs)
+    else:
+        import warnings
+        warnings.warn(DeprecationWarning(msg), stacklevel=stacklevel + 3)
+
+
+deprecation_warning._cache = set()
+
+
 def bytes_to_intlist(bs):
     if not bs:
         return []
@@ -4862,8 +4879,8 @@ def decode_base_n(string, n=None, table=None):
 
 
 def decode_base(value, digits):
-    write_string('DeprecationWarning: yt_dlp.utils.decode_base is deprecated '
+    deprecation_warning(f'{__name__}.decode_base is deprecated and may be removed '
-                 'and may be removed in a future version. Use yt_dlp.decode_base_n instead')
+                        f'in a future version. Use {__name__}.decode_base_n instead')
     return decode_base_n(value, table=digits)
 
 
@@ -5332,8 +5349,8 @@ def traverse_obj(
 
 
 def traverse_dict(dictn, keys, casesense=True):
-    write_string('DeprecationWarning: yt_dlp.utils.traverse_dict is deprecated '
+    deprecation_warning(f'"{__name__}.traverse_dict" is deprecated and may be removed '
-                 'and may be removed in a future version. Use yt_dlp.utils.traverse_obj instead')
+                        f'in a future version. Use "{__name__}.traverse_obj" instead')
     return traverse_obj(dictn, keys, casesense=casesense, is_user_input=True, traverse_string=True)