(m4.info.gz) M4wrap

Info Catalog

(m4.info.gz) Changeword

(m4.info.gz) Input Control

 
 Saving input
 ============
 
    It is possible to `save' some text until the end of the normal input
 has been seen.  Text can be saved, to be read again by `m4' when the
 normal input has been exhausted.  This feature is normally used to
 initiate cleanup actions before normal exit, e.g., deleting temporary
 files.
 
    To save input text, use the builtin `m4wrap':
 
      m4wrap(STRING, ...)
 
 which stores STRING and the rest of the arguments in a safe place, to
 be reread when end of input is reached.
 
      define(`cleanup', `This is the `cleanup' actions.
      ')
      =>
      m4wrap(`cleanup')
      =>
      This is the first and last normal input line.
      =>This is the first and last normal input line.
      ^D
      =>This is the cleanup actions.
 
    The saved input is only reread when the end of normal input is seen,
 and not if `m4exit' is used to exit `m4'.
 
    It is safe to call `m4wrap' from saved text, but then the order in
 which the saved text is reread is undefined.  If `m4wrap' is not used
 recursively, the saved pieces of text are reread in the opposite order
 in which they were saved (LIFO--last in, first out).
 

Info Catalog

(m4.info.gz) Changeword

(m4.info.gz) Input Control