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Annotation of gforth/more.fs, revision 1.1

1.1     ! anton       1: \ Forth output paging add-on (like more(1))
        !             2: 
        !             3: \ Copyright (C) 1996 Free Software Foundation, Inc.
        !             4: 
        !             5: \ This file is part of Gforth.
        !             6: 
        !             7: \ Gforth is free software; you can redistribute it and/or
        !             8: \ modify it under the terms of the GNU General Public License
        !             9: \ as published by the Free Software Foundation; either version 2
        !            10: \ of the License, or (at your option) any later version.
        !            11: 
        !            12: \ This program is distributed in the hope that it will be useful,
        !            13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: \ GNU General Public License for more details.
        !            16: 
        !            17: \ You should have received a copy of the GNU General Public License
        !            18: \ along with this program; if not, write to the Free Software
        !            19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: 
        !            21: 
        !            22: \ This add-on is for those poor souls whose terminals cannot scroll
        !            23: \ back but who want to read the output of 'words' at their leisure.
        !            24: 
        !            25: \ currently this is very primitive: it just counts newlines, and only
        !            26: \ allows continuing for another page (and of course, terminating
        !            27: \ processing by sending a signal (^C))
        !            28: 
        !            29: \ Some things to do:
        !            30: \ allow continuing for one line (Enter)
        !            31: \ count lines produced by wraparound (note tabs and backspaces)
        !            32: \ allow continuing silently
        !            33: \ fancy features like searching, scrollback etc.
        !            34: 
        !            35: \ one more-or-less simple way to achieve all this is to
        !            36: \ popen("less","w") and output there. Before getting the next `key`,
        !            37: \ we would perform a pclose. This idea due to Marcel Hendrix.
        !            38: 
        !            39: require termsize.fs
        !            40: 
        !            41: variable last-#lines 0 last-#lines !
        !            42: 
        !            43: :noname ( -- c )
        !            44:     1 last-#lines !
        !            45:     defers key ;
        !            46: is key
        !            47: 
        !            48: :noname ( c -- )
        !            49:     dup defers emit
        !            50:     #lf =
        !            51:     if
        !            52:        1 last-#lines +!
        !            53:        last-#lines @ rows >=
        !            54:        if
        !            55:            ." ... more ?" key drop 10 backspaces 10 spaces 10 backspaces
        !            56:        endif
        !            57:     endif ;
        !            58: is emit
        !            59: 
        !            60: :noname ( c-addr u -- )
        !            61:     bounds
        !            62:     ?DO
        !            63:        I c@ emit
        !            64:     LOOP ;
        !            65: is type