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- (define-module (scripts read-rfc822)
- :use-module (ice-9 regex)
- :use-module (ice-9 rdelim)
- :autoload (srfi srfi-13) (string-join)
- :export (read-rfc822 read-rfc822-silently))
- (define %include-in-guild-list #f)
- (define %summary "Validate an RFC822-style file.")
- (define from-line-rx (make-regexp "^From "))
- (define header-name-rx (make-regexp "^([^:]+):[ \t]*"))
- (define header-cont-rx (make-regexp "^[ \t]+"))
- (define option #f)
- (define (drain-message port)
- (let loop ((line (read-line port)) (acc '()))
- (cond ((eof-object? line)
- (reverse acc))
- ((and option (regexp-exec from-line-rx line))
- (for-each (lambda (c)
- (unread-char c port))
- (cons #\newline
- (reverse (string->list line))))
- (reverse acc))
- (else
- (loop (read-line port) (cons line acc))))))
- (define (parse-message port)
- (let* ((from (and option
- (match:suffix (regexp-exec from-line-rx
- (read-line port)))))
- (body-lines #f)
- (body #f)
- (headers '())
- (add-header! (lambda (reversed-hlines)
- (let* ((hlines (reverse reversed-hlines))
- (first (car hlines))
- (m (regexp-exec header-name-rx first))
- (name (string->symbol (match:substring m 1)))
- (data (string-join
- (cons (substring first (match:end m))
- (cdr hlines))
- " ")))
- (set! headers (acons name data headers))))))
-
- (let loop ((line (read-line port)) (current-header #f))
- (cond ((string-null? line)
- (and current-header (add-header! current-header))
- (set! body-lines (drain-message port)))
- ((regexp-exec header-cont-rx line)
- => (lambda (m)
- (loop (read-line port)
- (cons (match:suffix m) current-header))))
- (else
- (and current-header (add-header! current-header))
- (loop (read-line port) (list line)))))
- (set! headers (reverse headers))
- (lambda (component)
- (case component
- ((from) from)
- ((body-lines) body-lines)
- ((headers) headers)
- ((body) (or body
- (begin (set! body (string-join body-lines "\n" 'suffix))
- body)))
- (else (error "bad component:" component))))))
- (define (read-rfc822-silently port)
- (parse-message port))
- (define (display-rfc822 parse)
- (cond ((parse 'from) => (lambda (from) (format #t "From ~A\n" from))))
- (for-each (lambda (header)
- (format #t "~A: ~A\n" (car header) (cdr header)))
- (parse 'headers))
- (format #t "\n~A" (parse 'body)))
- (define (read-rfc822 . args)
- (let ((parse (read-rfc822-silently (open-file (car args) OPEN_READ))))
- (display-rfc822 parse))
- #t)
- (define main read-rfc822)
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