InputFile returns an io.Reader for the file pointed at by the --input flag.

Ints returns an iter.Seq[int] over all lines in the provided io.Reader, converting each line to an int.

Lines returns an iter.Seq[string] over all lines in the provided io.Reader.

Raw returns the contents of the provided io.Reader as one giant string.

Sections returns an iter.Seq[string] over all blocks of lines in the provided io.Reader.

SectionsOf returns sections of input from the provided io.Reader delimited by the provided string, exclusive.