fileinput

type FileInfo struct {
	// Filename of the current input file.
	Filename string

	// Line number within the file. (0 based)
	Line int
}

type FileInputSeq func(yield func(text, file string, line int) bool)

type Options struct {
	// If true, STDOUT will be redirected to the input file. For inline replacements.
	InlineReplace bool

	// Input files. Defaults to [os.Args].
	Files []string

	// Backup suffix. Defaults to ".bak".
	BackupSuffix string
}