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Title:   TODO LIST FOR PTYPLUMBER
Version: $HeadURL$ $LastChangedRevision$
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  * get it to handle input from a file fed on stdin before
    coded for a file generally.
  * then code for a file
  * then code readline support
  * readline fixes: when does readline modify terminal settings?
    is it at the time of registering the callback or only when
    the character is pushed into the readline buffer? When is
    the terminal restored? At deregistration? During the
    execution of the callback function? Both? I need to remember
    the unmodified settings and ensure they are restored during
    the execution of the command handler (I don't care what 
    they are during the callback).
  * add an 'echo' command
  * add a flag to the term data FLG_AWAITED
  * add a field to the term data called .alias (char BUFSIZ)
  * modify pfd_open() to accept an alias (NULL allowed to not
    define one) and modify the open command handler to accept
    'open [ <alias> ] <command>'.
  * the *real* command handler for 'wait' - which is the 
    main loop should not do whatever it nornally does on when
    retunring from a command handler unless there are no
    AWAITED PFDs; if there are then it should just loop into
    the select() function as if it was term_data[PFD_CONSOLE].outpfd != PFD_CONTROL
    until such time as the awaited PFDs have been closed (by
    the SIGCHLD handler cleaning up after the child exits)
  * waitall sets AWAITED on all non-PROCLESS PFDs (probably
    by calling pfd_setawaited(pfd) on each non-PROCLESS
    PFD)
  * support 'ptyplumber <filename>'; i need to distinguish
    0 from scriptfh; in the case that <filename> is not
    specified then I do 'scriptfh = 0', but if not then
    I need to open and close it.
  * make the choice of using readline or not a run-time
    choice, not a compile-time choice.
  * add 'set' command for:
	set desc <pfd> <desc>
	set readline <bool>
	set aufoflush <pfd> <bool>
  * if scriptfh is not a terminal (how does '[ -t ]'
    do this?) then 'set readline 0'
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