89 lines
2.2 KiB
Scheme
89 lines
2.2 KiB
Scheme
;;
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;; ansi.scm
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;;
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;; ANSI terminal support.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(module
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ansi
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(
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ansi
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ansi-tests!
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)
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(import scheme
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(chicken base)
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(chicken string)
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testing)
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;; Only basic ANSI colors and bold attribute support.
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(define colors
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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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(#:default . 0)
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(#:bold . 1)))
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;; Returns a list with elements matching pred? predicate.
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(define (filter pred? lst)
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(let loop ((lst lst)
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(res '()))
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(if (null? lst)
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(reverse res)
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(if (pred? (car lst))
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(loop (cdr lst)
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(cons (car lst) res))
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(loop (cdr lst)
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res)))))
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;; Returns ANSI sequence changing color and/or bold attribute.
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(define (ansi . args)
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(let ((argsl
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(map
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(lambda (key-color)
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(number->string (cdr key-color)))
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(filter
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identity
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(map (lambda (arg) (assq arg colors)) args)))))
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(if (null? argsl)
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""
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(string-append "\x1b["
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(string-intersperse argsl ";")
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"m"))))
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;; Performs ANSI module self-tests.
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(define (ansi-tests!)
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(run-tests
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ansi
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(test-equal? filter (filter odd? '(1 2 3 4)) '(1 3))
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(test-equal? filter (filter odd? '(2 4)) '())
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(test-equal? ansi (ansi #:red) "\x1b[31m")
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(test-equal? ansi (ansi #:nonsense) "")
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(test-equal? ansi (ansi #:default) "\x1b[0m")
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))
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)
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