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57737e24 TTN |
1 | #!/bin/sh |
2 | # aside from this initial boilerplate, this is actually -*- scheme -*- code | |
3 | main='(module-ref (resolve-module '\''(scripts read-rfc822)) '\'main')' | |
4 | exec ${GUILE-guile} -l $0 -c "(apply $main (cdr (command-line)))" "$@" | |
5 | !# | |
6 | ;;; read-rfc822 --- Validate RFC822 file by displaying it to stdout | |
7 | ||
8 | ;; Copyright (C) 2002 Free Software Foundation, Inc. | |
9 | ;; | |
10 | ;; This program is free software; you can redistribute it and/or | |
11 | ;; modify it under the terms of the GNU General Public License as | |
12 | ;; published by the Free Software Foundation; either version 2, or | |
13 | ;; (at your option) any later version. | |
14 | ;; | |
15 | ;; This program is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | ;; General Public License for more details. | |
19 | ;; | |
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with this software; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
23 | ;; Boston, MA 02111-1307 USA | |
24 | ||
25 | ;;; Author: Thien-Thi Nguyen <ttn@gnu.org> | |
26 | ||
27 | ;;; Commentary: | |
28 | ||
29 | ;; Usage: read-rfc822 FILE | |
30 | ;; | |
31 | ;; Read FILE, assumed to be in RFC822 format, and display it to stdout. | |
32 | ;; This is not very interesting, admittedly. | |
33 | ;; | |
34 | ;; For Scheme programming, this module exports two procs: | |
35 | ;; (read-rfc822 . args) ; only first arg used | |
36 | ;; (read-rfc822-silently port) | |
37 | ;; | |
38 | ;; Parse FILE (a string) or PORT, respectively, and return a query proc that | |
39 | ;; takes a symbol COMP, and returns the message component COMP. Supported | |
40 | ;; values for COMP (and the associated query return values) are: | |
41 | ;; from -- #f (reserved for future mbox support) | |
42 | ;; headers -- alist of (HEADER-SYMBOL . "VALUE-STRING") pairs, in order | |
43 | ;; body -- rest of the mail message, a string | |
44 | ;; body-lines -- rest of the mail message, as a list of lines | |
45 | ;; Any other query results in a "bad component" error. | |
46 | ;; | |
47 | ;; TODO: Add "-m" option (mbox support). | |
48 | ||
49 | ;;; Code: | |
50 | ||
51 | (define-module (scripts read-rfc822) | |
52 | :use-module (ice-9 regex) | |
53 | :use-module (ice-9 rdelim) | |
54 | :autoload (srfi srfi-13) (string-join) | |
55 | :export (read-rfc822 read-rfc822-silently)) | |
56 | ||
57 | (define from-line-rx (make-regexp "^From ")) | |
58 | (define header-name-rx (make-regexp "^([^:]+):[ \t]*")) | |
59 | (define header-cont-rx (make-regexp "^[ \t]+")) | |
60 | ||
61 | (define option #f) ; for future "-m" | |
62 | ||
63 | (define (drain-message port) | |
64 | (let loop ((line (read-line port)) (acc '())) | |
65 | (cond ((eof-object? line) | |
66 | (reverse acc)) | |
67 | ((and option (regexp-exec from-line-rx line)) | |
68 | (for-each (lambda (c) | |
69 | (unread-char c port)) | |
70 | (cons #\newline | |
71 | (reverse (string->list line)))) | |
72 | (reverse acc)) | |
73 | (else | |
74 | (loop (read-line port) (cons line acc)))))) | |
75 | ||
76 | (define (parse-message port) | |
77 | (let* ((from (and option | |
78 | (match:suffix (regexp-exec from-line-rx | |
79 | (read-line port))))) | |
80 | (body-lines #f) | |
81 | (body #f) | |
82 | (headers '()) | |
83 | (add-header! (lambda (reversed-hlines) | |
84 | (let* ((hlines (reverse reversed-hlines)) | |
85 | (first (car hlines)) | |
86 | (m (regexp-exec header-name-rx first)) | |
87 | (name (string->symbol (match:substring m 1))) | |
88 | (data (string-join | |
89 | (cons (substring first (match:end m)) | |
90 | (cdr hlines)) | |
91 | " "))) | |
92 | (set! headers (acons name data headers)))))) | |
93 | ;; "From " is only one line | |
94 | (let loop ((line (read-line port)) (current-header #f)) | |
95 | (cond ((string-null? line) | |
96 | (and current-header (add-header! current-header)) | |
97 | (set! body-lines (drain-message port))) | |
98 | ((regexp-exec header-cont-rx line) | |
99 | => (lambda (m) | |
100 | (loop (cdr lines) | |
101 | (cons (match:suffix m) current-header)))) | |
102 | (else | |
103 | (and current-header (add-header! current-header)) | |
104 | (loop (read-line port) (list line))))) | |
105 | (set! headers (reverse headers)) | |
106 | (lambda (component) | |
107 | (case component | |
108 | ((from) from) | |
109 | ((body-lines) body-lines) | |
110 | ((headers) headers) | |
111 | ((body) (or body | |
112 | (begin (set! body (string-join body-lines "\n" 'suffix)) | |
113 | body))) | |
114 | (else (error "bad component:" component)))))) | |
115 | ||
116 | (define (read-rfc822-silently port) | |
117 | (parse-message port)) | |
118 | ||
119 | (define (display-rfc822 parse) | |
120 | (cond ((parse 'from) => (lambda (from) (format #t "From ~A\n" from)))) | |
121 | (for-each (lambda (header) | |
122 | (format #t "~A: ~A\n" (car header) (cdr header))) | |
123 | (parse 'headers)) | |
124 | (format #t "\n~A" (parse 'body))) | |
125 | ||
126 | (define (read-rfc822 . args) | |
127 | (let ((parse (read-rfc822-silently (open-file (car args) OPEN_READ)))) | |
128 | (display-rfc822 parse)) | |
129 | #t) | |
130 | ||
131 | (define main read-rfc822) | |
132 | ||
133 | ;;; read-rfc822 ends here |