factor/library/io/ansi.factor

! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions are met:
! 
! 1. Redistributions of source code must retain the above copyright notice,
!    this list of conditions and the following disclaimer.
! 
! 2. Redistributions in binary form must reproduce the above copyright notice,
!    this list of conditions and the following disclaimer in the documentation
!    and/or other materials provided with the distribution.
! 
! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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IN: ansi
USE: lists
USE: kernel
USE: format
USE: namespaces
USE: stdio
USE: streams
USE: strings
USE: presentation
USE: generic

! Some words for outputting ANSI colors.

: black   0 ; inline
: red     1 ; inline
: green   2 ; inline
: yellow  3 ; inline
: blue    4 ; inline
: magenta 5 ; inline
: cyan    6 ; inline
: white   7 ; inline

: clear ( -- code )
    #! Clear screen
    "\e[2J\e[H" ; inline

: reset ( -- code )
    #! Reset ANSI color codes.
    "\e[0m" ; inline

: bold ( -- code )
    #! Switch on boldface.
    "\e[1m" ; inline

: fg ( color -- code )
    #! Set foreground color.
    "\e[3" swap "m" cat3 ; inline

: bg ( color -- code )
    #! Set foreground color.
    "\e[4" swap "m" cat3 ; inline

: ansi-attrs ( style -- )
    "bold"    over assoc [ bold , ] when
    "ansi-fg" over assoc [ fg , ] when*
    "ansi-bg" over assoc [ bg , ] when*
    drop ;
    
: ansi-attr-string ( string style -- string )
    [ ansi-attrs , reset , ] make-string ;

TRAITS: ansi-stream

M: ansi-stream fwrite-attr ( string style stream -- )
    [
        [ default-style ] unless* ansi-attr-string
        delegate get fwrite
    ] bind ;M

C: ansi-stream ( stream -- stream )
    #! Wraps the given stream in an ANSI stream. ANSI streams
    #! support the following character attributes:
    #! bold    - if not f, text is boldface.
    #! ansi-fg - foreground color
    #! ansi-bg - background color
    [ delegate set ] extend ;