78 lines
2.9 KiB
Scheme
78 lines
2.9 KiB
Scheme
;;;; fmt-color.scm -- colored output
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;;
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;; Copyright (c) 2006-2007 Alex Shinn. All rights reserved.
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;; BSD-style license: http://synthcode.com/license.txt
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(define (fmt-color st) (fmt-ref st 'color))
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(define (fmt-in-html? st) (fmt-ref st 'in-html?))
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(define (fmt-use-html-font? st) (fmt-ref st 'use-html-font?))
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(define (color->ansi x)
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(if (number? x)
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(let ((r (arithmetic-shift x -16))
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(g (bitwise-and (arithmetic-shift x -8) #xFF))
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(b (bitwise-and x #xFF)))
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;; just picks the highest color value - need to detect blends
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(color->ansi
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(cond
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((> r g) (if (> r b) 'red 'blue))
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((> g b) 'green)
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(else 'blue))))
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(case x
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((bold) "1")
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((dark) "2")
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((underline) "4")
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((black) "30")
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((red) "31")
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((green) "32")
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((yellow) "33")
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((blue) "34")
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((magenta) "35")
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((cyan) "36")
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((white) "37")
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(else "0"))))
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(define (ansi-escape color)
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(cat (integer->char 27) "[" (color->ansi color) "m"))
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(define (fmt-in-html . args)
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(fmt-let 'in-html? #t (apply-cat args)))
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(define (fmt-colored color . args)
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(fmt-if fmt-in-html?
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(cond
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((eq? color 'bold)
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(cat "<b>" (apply-cat args) "</b>"))
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((eq? color 'underline)
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(cat "<u>" (apply-cat args) "</u>"))
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(else
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(let ((cname (if (number? color) (cat "#" color) color)))
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(fmt-if fmt-use-html-font?
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(cat "<font color=\"" cname "\">" (apply-cat args)
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"</font>")
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(cat "<span style=color:\"" cname "\">"
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(apply-cat args) "</span>")))))
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(lambda (st)
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(let ((old-color (fmt-color st)))
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((fmt-let 'color color
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(cat (ansi-escape color)
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(apply-cat args)
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(if (or (memv color '(bold underline))
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(memv old-color '(bold underline)))
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(ansi-escape 'reset)
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(lambda (st) st))
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(ansi-escape old-color)))
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st)))))
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(define (fmt-red . args) (fmt-colored 'red (apply-cat args)))
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(define (fmt-blue . args) (fmt-colored 'blue (apply-cat args)))
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(define (fmt-green . args) (fmt-colored 'green (apply-cat args)))
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(define (fmt-cyan . args) (fmt-colored 'cyan (apply-cat args)))
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(define (fmt-yellow . args) (fmt-colored 'yellow (apply-cat args)))
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(define (fmt-magenta . args) (fmt-colored 'magenta (apply-cat args)))
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(define (fmt-white . args) (fmt-colored 'white (apply-cat args)))
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(define (fmt-black . args) (fmt-colored 'black (apply-cat args)))
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(define (fmt-bold . args) (fmt-colored 'bold (apply-cat args)))
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(define (fmt-underline . args) (fmt-colored 'underline (apply-cat args)))
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