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Add format type B for outtmpl to treat the value as bytes

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This is useful to limit the filename to a certain number of bytes rather than characters
Closes #1003
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pukkandan 2021-09-17 23:46:17 +05:30
parent f1f6ca78b4
commit f5aa5cfbff
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3 changed files with 9 additions and 4 deletions
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4
README.md
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@ -952,14 +952,14 @@ The `-o` option is used to indicate a template for the output file names while `
The simplest usage of `-o` is not to set any template arguments when downloading a single file, like in `yt-dlp -o funny_video.flv "https://some/video"` (hard-coding file extension like this is _not_ recommended and could break some post-processing).
It may however also contain special sequences that will be replaced when downloading each video. The special sequences may be formatted according to [python string formatting operations](https://docs.python.org/2/library/stdtypes.html#string-formatting). For example, `%(NAME)s` or `%(NAME)05d`. To clarify, that is a percent symbol followed by a name in parentheses, followed by formatting operations.
It may however also contain special sequences that will be replaced when downloading each video. The special sequences may be formatted according to [python string formatting operations](https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting). For example, `%(NAME)s` or `%(NAME)05d`. To clarify, that is a percent symbol followed by a name in parentheses, followed by formatting operations.
The field names themselves (the part inside the parenthesis) can also have some special formatting:
1. **Object traversal**: The dictionaries and lists available in metadata can be traversed by using a `.` (dot) separator. You can also do python slicing using `:`. Eg: `%(tags.0)s`, `%(subtitles.en.-1.ext)s`, `%(id.3:7:-1)s`, `%(formats.:.format_id)s`. `%()s` refers to the entire infodict. Note that all the fields that become available using this method are not listed below. Use `-j` to see such fields
1. **Addition**: Addition and subtraction of numeric fields can be done using `+` and `-` respectively. Eg: `%(playlist_index+10)03d`, `%(n_entries+1-playlist_index)d`
1. **Date/time Formatting**: Date/time fields can be formatted according to [strftime formatting](https://docs.python.org/3/library/datetime.html#strftime-and-strptime-format-codes) by specifying it separated from the field name using a `>`. Eg: `%(duration>%H-%M-%S)s`, `%(upload_date>%Y-%m-%d)s`, `%(epoch-3600>%H-%M-%S)s`
1. **Default**: A default value can be specified for when the field is empty using a `|` seperator. This overrides `--output-na-template`. Eg: `%(uploader|Unknown)s`
1. **More Conversions**: In addition to the normal format types `diouxXeEfFgGcrs`, `j`, `l`, `q` can be used for converting to **j**son, a comma seperated **l**ist and a string **q**uoted for the terminal respectively
1. **More Conversions**: In addition to the normal format types `diouxXeEfFgGcrs`, `B`, `j`, `l`, `q` can be used for converting to **B**ytes, **j**son, a comma seperated **l**ist and a string **q**uoted for the terminal respectively
To summarize, the general syntax for a field is:
```

2
test/test_YoutubeDL.py
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@ -649,6 +649,7 @@ class TestYoutubeDL(unittest.TestCase):
'title2': '%PATH%',
'title3': 'foo/bar\\test',
'title4': 'foo "bar" test',
'title5': 'áéí',
'timestamp': 1618488000,
'duration': 100000,
'playlist_index': 1,
@ -767,6 +768,7 @@ class TestYoutubeDL(unittest.TestCase):
test('%(ext)l', 'mp4')
test('%(formats.:.id) 15l', ' id1, id2, id3')
test('%(formats)j', (json.dumps(FORMATS), sanitize(json.dumps(FORMATS))))
test('%(title5).3B', 'á')
if compat_os_name == 'nt':
test('%(title4)q', ('"foo \\"bar\\" test"', "'foo _'bar_' test'"))
else:

7
yt_dlp/YoutubeDL.py
View File

@ -907,7 +907,7 @@ class YoutubeDL(object):
def validate_outtmpl(cls, outtmpl):
''' @return None or Exception object '''
outtmpl = re.sub(
STR_FORMAT_RE_TMPL.format('[^)]*', '[ljq]'),
STR_FORMAT_RE_TMPL.format('[^)]*', '[ljqB]'),
lambda mobj: f'{mobj.group(0)[:-1]}s',
cls._outtmpl_expandpath(outtmpl))
try:
@ -939,7 +939,7 @@ class YoutubeDL(object):
}
TMPL_DICT = {}
EXTERNAL_FORMAT_RE = re.compile(STR_FORMAT_RE_TMPL.format('[^)]*', f'[{STR_FORMAT_TYPES}ljq]'))
EXTERNAL_FORMAT_RE = re.compile(STR_FORMAT_RE_TMPL.format('[^)]*', f'[{STR_FORMAT_TYPES}ljqB]'))
MATH_FUNCTIONS = {
'+': float.__add__,
'-': float.__sub__,
@ -1031,6 +1031,9 @@ class YoutubeDL(object):
value, fmt = json.dumps(value, default=_dumpjson_default), str_fmt
elif fmt[-1] == 'q':
value, fmt = compat_shlex_quote(str(value)), str_fmt
elif fmt[-1] == 'B':
value = f'%{str_fmt}'.encode('utf-8') % str(value).encode('utf-8')
value, fmt = value.decode('utf-8', 'ignore'), 's'
elif fmt[-1] == 'c':
value = str(value)
if value is None: