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@ -1246,7 +1246,7 @@ # OUTPUT TEMPLATE
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1. **Alternatives**: Alternate fields can be specified separated with a `,`. E.g. `%(release_date>%Y,upload_date>%Y|Unknown)s`
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1. **Replacement**: A replacement value can be specified using a `&` separator. If the field is *not* empty, this replacement value will be used instead of the actual field content. This is done after alternate fields are considered; thus the replacement is used if *any* of the alternative fields is *not* empty.
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1. **Replacement**: A replacement value can be specified using a `&` separator according to the [`str.format` mini-language](https://docs.python.org/3/library/string.html#format-specification-mini-language). If the field is *not* empty, this replacement value will be used instead of the actual field content. This is done after alternate fields are considered; thus the replacement is used if *any* of the alternative fields is *not* empty. E.g. `%(chapters&has chapters|no chapters)s`, `%(title&TITLE={:>20}|NO TITLE)s`
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1. **Default**: A literal default value can be specified for when the field is empty using a `|` separator. This overrides `--output-na-placeholder`. E.g. `%(uploader|Unknown)s`
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@ -822,7 +822,10 @@ def expect_same_infodict(out):
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test('%(title&foo|baz)s.bar', 'baz.bar')
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test('%(x,id&foo|baz)s.bar', 'foo.bar')
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test('%(x,title&foo|baz)s.bar', 'baz.bar')
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test('%(title&\n|)s', '\n')
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test('%(id&a\nb|)s', ('a\nb', 'a b'))
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test('%(id&hi {:>10} {}|)s', 'hi 1234 1234')
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test(R'%(id&{0} {}|)s', 'NA')
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test(R'%(id&{0.1}|)s', 'NA')
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# Laziness
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def gen():
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@ -21,7 +21,7 @@
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import traceback
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import unicodedata
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import urllib.request
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from string import ascii_letters
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from string import Formatter, ascii_letters
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from .cache import Cache
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from .compat import compat_os_name, compat_shlex_quote
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@ -1237,6 +1237,14 @@ def _dumpjson_default(obj):
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return list(obj)
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return repr(obj)
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class _ReplacementFormatter(Formatter):
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def get_field(self, field_name, args, kwargs):
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if field_name.isdigit():
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return args[0], -1
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raise ValueError('Unsupported field')
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replacement_formatter = _ReplacementFormatter()
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def create_key(outer_mobj):
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if not outer_mobj.group('has_key'):
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return outer_mobj.group(0)
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@ -1258,7 +1266,13 @@ def create_key(outer_mobj):
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if fmt == 's' and value is not None and key in field_size_compat_map.keys():
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fmt = f'0{field_size_compat_map[key]:d}d'
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value = default if value is None else value if replacement is None else replacement
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if value is None:
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value = default
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elif replacement is not None:
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try:
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value = replacement_formatter.format(replacement, value)
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except ValueError:
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value = na
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flags = outer_mobj.group('conversion') or ''
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str_fmt = f'{fmt[:-1]}s'
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