sunet/scheme/httpd/rman-gateway.scm

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;;; man page -> HTML gateway for the SU web server. -*- Scheme -*-
;;; Copyright (c) 1996 by Mike Sperber.
;;; This uses RosettaMan and is currently based on version 2.5a6
;;; (RosettaMan is based at
;;; ftp.cs.berkeley.edu:/ucb/people/phelps/tcltk/rman.tar.Z)
(define rman/rman '(rman -fHTML))
(define rman/man '(man))
(define rman/nroff '(nroff -man))
(define rman/gzcat '(zcat))
(define rman/zcat '(zcat))
(define (rman-handler finder referencer address . maybe-man)
(let ((parse-man-url
(cond
((procedure? finder) finder)
((list? finder)
(lambda (url)
(values finder
(unescape-uri (http-url:search url))
'())))
(else
(let ((man-path ((infix-splitter ":") (getenv "MANPATH"))))
(lambda (url)
(values man-path
(unescape-uri (http-url:search url))
'()))))))
(reference-template
(cond
((procedure? referencer) referencer)
((string? referencer) (lambda (entry section) referencer))
(else (lambda (entry section) "man?%s(%s)"))))
(man (:optional maybe-man man)))
(lambda (path req)
(let ((request-method (request:method req)))
(cond
((string=? request-method "GET")
(with-fatal-error-handler
(lambda (c decline)
(cond
((http-error? c)
(apply http-error (car (condition-stuff c)) req
(cddr (condition-stuff c))))
(else
(decline))))
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(if (not (v0.9-request? req))
(begin
(begin-http-header #t http-reply/ok)
(write-string "Content-type: text/html\r\n")
(write-string "\r\n")))
(receive (man-path entry and-then) (parse-man-url (request:url req))
(emit-man-page entry man man-path and-then reference-template))
(with-tag #t address ()
(display address))))
(else (http-error http-reply/method-not-allowed req)))))))
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(define (cat-man-page key section)
(let ((title (if section
(format #f "~a(~a) manual page" key section)
(format #f "~a manual page" key))))
(emit-title #t title)
(emit-header #t 1 title)
(newline)
(with-tag #t body ()
(with-tag #t pre ()
(copy-inport->outport (current-input-port)
(current-output-port))))))
(define (emit-man-page entry man man-path and-then reference-template)
(receive (key section) (parse-man-entry entry)
(let ((status
(cond
((procedure? and-then)
(run (| (begin (man section key man-path))
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(begin (and-then key section)))
stdports))
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(else
(run (| (begin (man section key man-path))
(,@rman/rman ,@and-then
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-r ,(reference-template entry section)))
stdports)))))
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(if (not (zero? status))
(http-error http-reply/internal-error #f
"internal error emitting man page")))))
(define parse-man-entry
(let ((entry-regexp (make-regexp "(.*)\\((.)\\)")))
(lambda (s)
(cond
((regexp-exec entry-regexp s)
=> (lambda (match)
(values (match:substring match 1)
(match:substring match 2))))
(else (values s #f))))))
(define (man section key man-path)
(cond
((procedure? man-path) (man-path))
((find-man-file key section "cat" man-path) => cat-n-decode)
((find-man-file key section "man" man-path) => nroff-n-decode)
(else
(if (not (zero?
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(with-env (("MANPATH" . ,(string-join man-path ":")))
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(run (,@rman/man ,@(if section `(,section) '()) ,key)
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stdports))))
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(http-error http-reply/not-found #f "man page not found")))))
(define man-default-sections
'("1" "2" "3" "4" "5" "6" "7" "8" "9" "o" "l" "n" "p"))
(define (find-man-file name section cat-man man-path . maybe-sections)
(define (section-dir section)
(lambda (dir)
(file-name-as-directory
(string-append (file-name-as-directory dir)
cat-man
section))))
(let* ((prefix (if section
(string-append name "." section)
(string-append name ".")))
(pattern (string-append (glob-quote prefix) "*"))
(sections (:optional maybe-sections man-default-sections))
(path (if section
(map (section-dir section) man-path)
(apply append
(map (lambda (dir)
(map (lambda (section)
((section-dir section) dir))
sections))
man-path)))))
(let loop ((path path))
(and (not (null? path))
(let ((matches (glob (string-append (car path) pattern))))
(if (not (null? matches))
(car matches)
(loop (cdr path))))))))
(define (file->man-directory file)
(path-list->file-name
(reverse
(cdr
(reverse
(split-file-name
(file-name-directory file)))))))
(define (cat-n-decode file)
(let ((ext (file-name-extension file)))
(cond
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((string=? ".gz" ext) (run (,@rman/gzcat ,file) stdports))
((string=? ".Z" ext) (run (,@rman/zcat ,file) stdports))
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(else (call-with-input-file
file
(lambda (port)
(copy-inport->outport port (current-output-port))))))))
(define (nroff-n-decode file)
(if (not (zero? (run (| (begin (cat-n-decode file))
(begin
(with-cwd (file->man-directory file)
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(exec-epf (,@rman/nroff)))))
stdports)))
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(http-error http-reply/not-found #f "man page not found")))