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;;; (yolk attrs) --- text attributes
(import (scheme base)
(scheme write)
(chicken string)
(yolk common))
(define %props-alist
'((reset . "0")
;; name . (on . off)
(bold . ("1" . "22"))
(dim . ("2" . "22"))
(italic . ("3" . "23"))
(underline . ("4" . "24"))
(blink . ("5" . "25"))
(inverse . ("7" . "27"))
(hidden . ("8" . "28"))
(strikethrough . ("9" . "29"))))
(define (prop? x)
(let ((x? (memq x (map car %props-alist))))
(if x? x #f)))
(define %colors-alist
'((reset . "0")
;; color . (fg . bg)
(black . ("30" . "40"))
(red . ("31" . "41"))
(green . ("32" . "42"))
(yellow . ("33" . "43"))
(blue . ("34" . "44"))
(magenta . ("35" . "45"))
(cyan . ("36" . "46"))
(white . ("37" . "47"))
(default . ("39" . "49"))))
(define (color? x)
(let ((x? (memq x (map car %colors-alist))))
(if x? x #f)))
(define (attrs as)
(let loop ((as as)
(acc '()))
(cond
((null? as)
(attr-list->escape (reverse acc)))
((eq? as 'reset)
(csi "0m"))
(else
(loop (cdr as)
(cons (attr->code (car as))
acc))))))
(define (attr-list->escape al)
(let ((code-string (string-intersperse (map ->string al) ";")))
(csi code-string "m")))
(define (attr->code attr)
(cond
((number? attr) attr)
((or (color? attr)
(and (pair? attr)
(eq? (car attr) 'fg)
(or (color? (cdr attr))
(color? (cadr attr)))))
=> (lambda (clr)
(cadr (assq clr %colors-alist))))
((and (pair? attr)
(eq? (car attr) 'bg)
(or (color? (cdr attr))
(color? (cadr attr))))
=> (lambda (clr)
(cddr (assq clr %colors-alist))))
((or (prop? attr)
(and (pair? attr)
(eq? (car attr) 'set)
(or (prop? (cdr attr))
(prop? (cadr attr)))))
=> (lambda (prop)
(cadr (assq prop %props-alist))))
((and (pair? attr)
(eq? (car attr) 'reset)
(or (prop? (cdr attr))
(prop? (cadr attr))))
=> (lambda (prop)
(cddr (assq prop %props-alist))))
(else (error "Bad attribute" attr))))
(define (with-attrs as str)
(string-append
(attrs as)
str
(attrs 'reset)))
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