[texhax] How to define a macro like \input

[ky anh]

As you know, \input treats his arguments
in various ways, for example, \input{foo.tex}
has the same effect as:
  \input foo.tex
  \input foo
  \input foo any_thing_ignored_by_\input
  \input foo\par % \par hasnot effect

Yes, how can we define a macro like \input?

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