sunet/scheme/httpd/rman-gateway.scm

191 lines
5.5 KiB
Scheme

;;; man page -> HTML gateway for the SU web server. -*- Scheme -*-
;;; This file is part of the Scheme Untergrund Networking package.
;;; Copyright (c) 1996-2003 by Mike Sperber.
;;; For copyright information, see the file COPYING which comes with
;;; the distribution.
;;; This uses RosettaMan
;;; (based at ftp.cs.berkeley.edu:/ucb/people/phelps/tcltk/rman.tar.Z)
(define (rman-handler man-binary
nroff-binary
rman-binary
gzcat-binary
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))))
(make-response
(status-code ok)
#f
(time)
"text/html"
'()
(make-writer-body
(lambda (out options)
(receive (man-path entry and-then)
(parse-man-url (request-url req))
(emit-man-page man-binary nroff-binary rman-binary
gzcat-binary
entry man man-path and-then reference-template out))
(with-tag out address ()
(display address out)))))))
(else
(make-error-response (status-code method-not-allowed) req
request-method)))))))
(define (cat-man-page key section out)
(let ((title (if section
(format #f "~a(~a) manual page" key section)
(format #f "~a manual page" key))))
(emit-title out title)
(emit-header out 1 title)
(newline out)
(with-tag out body ()
(with-tag out pre ()
(copy-inport->outport (current-input-port)
out)))))
(define (emit-man-page man-binary nroff-binary rman-binary
gzcat-binary
entry man man-path and-then reference-template out)
(receive (key section) (parse-man-entry entry)
(let ((status
(cond
((procedure? and-then)
(run (| (begin (man man-binary nroff-binary gzcat-binary
section key man-path))
(begin (and-then key section)))
(= 1 ,out)
(= 2 ,out)))
(else
(run (| (begin (man man-binary nroff-binary gzcat-binary
section key man-path))
(,rman-binary "-fHTML"
,@and-then
"-r" ,(reference-template entry section)))
(= 1 ,out)
(= 2 ,out))))))
(if (not (zero? status))
(error "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 man-binary nroff-binary gzcat-binary section key man-path)
(cond
((procedure? man-path) (man-path))
((find-man-file key section "cat" man-path) =>
(lambda (file)
(cat-n-decode gzcat-binary file)))
((find-man-file key section "man" man-path) =>
(lambda (file)
(nroff-n-decode nroff-binary file)))
(else
(if (not (zero?
(with-env (("MANPATH" . ,(string-join man-path ":")))
(run (,man-binary "-man" ,@(if section `(,section) '()) ,key)
stdports))))
(http-error (status-code 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 gzcat-binary file)
(let ((ext (file-name-extension file)))
(cond
((string=? ".gz" ext) (run (,gzcat-binary ,file) stdports))
((string=? ".Z" ext) (run (,gzcat-binary ,file) stdports))
(else (call-with-input-file
file
(lambda (port)
(copy-inport->outport port (current-output-port))))))))
(define (nroff-n-decode nroff-binary gzcat-binary file)
(if (not (zero? (run (| (begin (cat-n-decode gzcat-binary file))
(begin
(with-cwd (file->man-directory file)
(exec-epf (,nroff-binary "-man")))))
stdports)))
(http-error (status-code not-found) #f "man page not found")))