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batch-file enumeration improvements (https://github.com/ytdl-org/youtube-dl/pull/26813)
Co-authored by: glenn-slayden
Modified from c9a9ccf8a3
These improvements apply to reading the list of URLs from the file supplied via the `--batch-file` (`-a`) command line option.
1. Skip blank and empty lines in the file. Currently, lines with leading whitespace are only skipped when that whitespace is followed by a comment character (`#`, `;`, or `]`). This means that empty lines and lines consisting only of whitespace are returned as (trimmed) empty strings in the list of URLs to process.
2. [bug fix] Detect and remove the Unicode BOM when the file descriptor is already decoding Unicode.
With Python 3, the `batch_fd` enumerator returns the lines of the file as Unicode. For UTF-8, this means that the raw BOM bytes from the file `\xef \xbb \xbf` show up converted into a single `\ufeff` character prefixed to the first enumerated text line.
This fix solves several buggy interactions between the presence of BOM, the skipping of comments and/or blank lines, and ensuring the list of URLs is consistently trimmed. For example, if the first line of the file is blank, the BOM is incorrectly returned as a URL standing alone. If the first line contains a URL, it will be prefixed with this unwanted single character--but note that its being there will have inhibited the proper trimming of any leading whitespace. Currently, the `UnicodeBOMIE` helper attempts to recover from some of these error cases, but this fix prevents the error from happening in the first place (at least on Python3). In any case, the `UnicodeBOMIE` approach is flawed, because it is clearly illogical for a BOM to appear in the (non-batch) URL(s) specified directly on the command line (and for that matter, on URLs *after the first line* of a batch list, also)
3. Adds proper trimming of the " #" into the read_batch_urls processing so that the URLs it enumerates are cleaned and trimmed more consistently.
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@ -3892,13 +3892,16 @@ def read_batch_urls(batch_fd):
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def fixup(url):
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if not isinstance(url, compat_str):
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url = url.decode('utf-8', 'replace')
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BOM_UTF8 = '\xef\xbb\xbf'
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if url.startswith(BOM_UTF8):
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url = url[len(BOM_UTF8):]
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url = url.strip()
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if url.startswith(('#', ';', ']')):
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BOM_UTF8 = ('\xef\xbb\xbf', '\ufeff')
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for bom in BOM_UTF8:
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if url.startswith(bom):
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url = url[len(bom):]
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url = url.lstrip()
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if not url or url.startswith(('#', ';', ']')):
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return False
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return url
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# "#" cannot be stripped out since it is part of the URI
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# However, it can be safely stipped out if follwing a whitespace
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return re.split(r'\s#', url, 1)[0].rstrip()
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with contextlib.closing(batch_fd) as fd:
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return [url for url in map(fixup, fd) if url]
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