s: (put 'declare-date-header! 'scheme-indent-function 1)
(define (declare-date-header! name)
  (declare-header! name
    parse-date date? write-date))

;; emacs: (put 'declare-string-list-header! 'scheme-indent-function 1)
(define (declare-string-list-header! name)
  (declare-header! name
    split-and-trim list-of-strings? write-list-of-strings))

;; emacs: (put 'declare-symbol-list-header! 'scheme-indent-function 1)
(define (declare-symbol-list-header! name)
  (declare-header! name
    (lambda (str)
      (map string->symbol (split-and-trim str)))
    (lambda (v)
      (list-of? v symbol?))
    (lambda (v port)
      (put-list port v put-symbol ", "))))

;; emacs: (put 'declare-header-list-header! 'scheme-indent-function 1)
(define (declare-header-list-header! name)
  (declare-header! name
    split-header-names list-of-header-names? write-header-list))

;; emacs: (put 'declare-integer-header! 'scheme-indent-function 1)
(define (declare-integer-header! name)
  (declare-header! name
    parse-non-negative-integer non-negative-integer?
    (lambda (val port) (put-non-negative-integer port val))))

;; emacs: (put 'declare-uri-reference-header! 'scheme-indent-function 1)
(define (declare-uri-reference-header! name)
  (declare-header! name
    (lambda (str)
      (or (string->uri-reference str)
          (bad-header-component 'uri-reference str)))
    uri-reference?
    write-uri))

;; emacs: (put 'declare-quality-list-header! 'scheme-indent-function 1)
(define (declare-quality-list-header! name)
  (declare-header! name
    parse-quality-list validate-quality-list write-quality-list))

;; emacs: (put 'declare-param-list-header! 'scheme-indent-function 1)
(define* (declare-param-list-header! name #:optional
                                     (val-parser default-val-parser)
                                     (val-validator default-val-validator)
                                     (val-writer default-val-writer))
  (declare-header! name
    (lambda (str) (parse-param-list str val-parser))
    (lambda (val) (validate-param-list val val-validator))
    (lambda (val port) (write-param-list val port val-writer))))

;; emacs: (put 'declare-key-value-list-header! 'scheme-indent-function 1)
(define* (declare-key-value-list-header! name #:optional
                                         (val-parser default-val-parser)
                                         (val-validator default-val-validator)
                                         (val-writer default-val-writer))
  (declare-header! name
    (lambda (str) (parse-key-value-list str val-parser))
    (lambda (val) (key-value-list? val val-validator))
    (lambda (val port) (write-key-value-list val port val-writer))))

;; emacs: (put 'declare-entity-tag-list-header! 'scheme-indent-function 1)
(define (declare-entity-tag-list-header! name)
  (declare-header! name
    (lambda (str) (if (string=? str "*") '* (parse-entity-tag-list str)))
    (lambda (val) (or (eq? val '*) (entity-tag-list? val)))
    (lambda (val port)
      (if (eq? val '*)
          (put-string port "*")
          (put-entity-tag-list port val)))))

;; emacs: (put 'declare-credentials-header! 'scheme-indent-function 1)
(define (declare-credentials-header! name)
  (declare-header! name
    parse-credentials validate-credentials write-credentials))

;; emacs: (put 'declare-challenge-list-header! 'scheme-indent-function 1)
(define (declare-challenge-list-header! name)
  (declare-header! name
    parse-challenges validate-challenges write-challenges))