append a proper ? or & to url.

Ask user to confirm an (dangerous) action via typing yes in tty.

https://stackoverflow.com/questions/23350173 copy none-empty field values from src to dst.

similar to JavaScript's Object.assign(args[0], args[1], args[2]...), update and return args[0].

BytesSize returns a human-readable size in bytes, kibibytes, mebibytes, gibibytes, or tebibytes (e.g.: "44kiB", "17MiB").

Return at most 6 chars, e.g.: "123.1G".

From https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file .

Shallow copy a slice.

CustomSize returns a human-readable approximation of a size using custom format.

DIY 了几个选择器语法（附加在标准CSS选择器字符串末尾）.

try to extract absoulte time from DOM.

Extract filename from http response "Content-Disposition: attachment; filename=..." header.

offset: if > 0, indicates the bytes offset of the end of found time string in original str.

FromHumanSize returns an integer from a human-readable specification of a size using SI standard (e.g.: "44kB", "17MB").

return a none-existing filename.

return (top-level) domain of a url.

"*.torrent" => ["a.torrent", "b.torrent"...].

HumanSize returns a human-readable approximation of a size capped at 4 valid numbers (e.g.: "2.746 MB", "796 KB").

HumanSizeWithPrecision allows the size to be in any precision, instead of 4 digit precision used in units.HumanSize.

Check whether str is a url of "magnet:" or "bc://bt/" schema.

Create hardlink duplicate for source dir at dest.

ParseDuration parses a duration string.

Parse standard HTTP_PROXY, HTTPS_PROXY, NO_PROXY (and lowercase versions) envs, return proxy for urlStr.

Parse a baseUrl relative relativeUrl, return absolute url.

Parse time.

Return time duration in seconds.

RAMInBytes parses a human-readable string representing an amount of RAM in bytes, kibibytes, mebibytes, gibibytes, or tebibytes and returns the number of bytes, or -1 if the string is unparseable.

https://stackoverflow.com/questions/6395076/using-reflect-how-do-you-set-the-value-of-a-struct-field.

split a csv like line to values.

Return prefix of str that is at most max bytes encoded in UTF-8.

Return prefix of string at most width and actual width.

From https://stackoverflow.com/questions/23589564/function-for-converting-a-struct-to-map-in-golang .

Return de-duplicated slice that every member has unique key.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

header 占位符。用于保证实际发送 headers 的顺序.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.

See: http://en.wikipedia.org/wiki/Binary_prefix.