File:  [gforth] / gforth / more.fs
Revision 1.3: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:51 2003 UTC (16 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ Forth output paging add-on (like more(1))
    2: 
    3: \ Copyright (C) 1996,2000 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., 59 Temple Place, Suite 330, Boston, MA 02111, 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

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