Annotation of gforth/more.fs, revision 1.2

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
1.2     ! anton      19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      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

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