664 lines
21 KiB
Scheme
664 lines
21 KiB
Scheme
;;; GNU info -> HTML gateway for the SU web server. -*- Scheme -*-
|
|
|
|
;;; This file is part of the Scheme Untergrund Networking package.
|
|
|
|
;;; Copyright (c) 1996 by Mike Sperber.
|
|
;;; based on code with the same purpose by Gaebe Engelhart
|
|
;;; For copyright information, see the file COPYING which comes with
|
|
;;; the distribution.
|
|
|
|
|
|
;;; (info-handler parse-info reference find-icon address) -> handler
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;;; This function creates a request handler that converts GNU info pages
|
|
;;; on-the-fly. It is highly parameterizable to accomodate a wide
|
|
;;; range of environments. The parameters specify how to find the
|
|
;;; source code for the info pages, and how to generate certain
|
|
;;; elements of the generated HTML output.
|
|
;;;
|
|
;;; PARSE-INFO specifies how to parse the URLs that end up in the
|
|
;;; handler.
|
|
;;; It can be:
|
|
;;;
|
|
;;; * a procedure which is called with the URL as its parameters.
|
|
;;; It is expected to return with two values, FIND-ENTRY and
|
|
;;; NODE-NAME. FIND-ENTRY, in turn, can be either a procedure
|
|
;;; which gets passed the file name of an info node and is
|
|
;;; supposed to return with an absolute name of same. If it is a
|
|
;;; list, that list is taken as a list of directories in which to
|
|
;;; search for the info files. NODE-NAME is supposed to be the
|
|
;;; name of an info node of the form (<file>)<node>, extracted
|
|
;;; from the URL.
|
|
;;;
|
|
;;; * a list, in which case that is taken as a list of
|
|
;;; directories in which to search for the info files. The node
|
|
;;; name of a node is extracted from the URL by just taking the
|
|
;;; search component of the URL.
|
|
;;;
|
|
;;; * #f in which case the info path is taken from the environment
|
|
;;; variable INFOPATH, and the node name extraction works as
|
|
;;; above.
|
|
;;;
|
|
;;; REFERENCE specifies how to generate cross-references to other info
|
|
;;; nodes. It can be:
|
|
;;;
|
|
;;; * a procedure which gets called with the URL of the info page
|
|
;;; which contains the reference, and the node name of the node
|
|
;;; to be referenced. The procedure is expected to return the
|
|
;;; text for a link.
|
|
;;;
|
|
;;; * a string, in which case that is to be a prefix to which the
|
|
;;; node name is simply appended to yield the new link.
|
|
;;;
|
|
;;; * #f in which case all references have the form
|
|
;;; info?<node-name>.
|
|
;;;
|
|
;;; FIND-ICON specifies to to find the various icons used to decorate
|
|
;;; info pages. It can be:
|
|
;;;
|
|
;;; * a procedure which gets passed one of the tags in
|
|
;;; DEFAULT-ICON-ALIST and is supposed to return a link for the
|
|
;;; appropriate icon (or #f if no icon is to be used)
|
|
;;;
|
|
;;; * a string which is taken as a prefix to which one of the
|
|
;;; appropriate icon name from DEFAULT-ICON-ALIST is appended.
|
|
;;; (Note that these icon names were stolen from the
|
|
;;; cern-httpd-3.0 distribution at
|
|
;;; http://www.w3.org/pub/WWW/Daemon/.)
|
|
;;;
|
|
;;; * a list which is taken as an alist of the same format as
|
|
;;; DEFAULT-ICON-ALIST.
|
|
;;;
|
|
;;; * #f in which case no icons are used.
|
|
;;;
|
|
;;; ADDRESS a string to be appended at the bottom of all info pages
|
|
;;;
|
|
;;; To install a vanilla info handler for a prefix "info?" that looks
|
|
;;; in the environment variable INFOPATH, just use something like
|
|
;;; (info-handler #f #f #f "Generated by info-gateway")
|
|
|
|
;;; TODO: write a CGI version of this
|
|
|
|
(define-condition-type 'info-gateway-error '(error))
|
|
|
|
(define info-gateway-error? (condition-predicate 'info-gateway-error))
|
|
|
|
(define (info-gateway-error msg . irritants)
|
|
(apply signal 'info-gateway-error msg irritants))
|
|
|
|
(define default-icon-alist
|
|
'((info . "infodoc.gif")
|
|
(up . "up.gif")
|
|
(next . "next.gif")
|
|
(previous . "prev.gif")
|
|
(menu . "menu.gif")))
|
|
|
|
(define (info-handler parse-info reference find-icon address)
|
|
(let ((icon-name
|
|
(cond
|
|
((procedure? find-icon) find-icon)
|
|
((string? find-icon)
|
|
(let ((alist
|
|
(map (lambda (entry)
|
|
(cons (car entry)
|
|
(string-append find-icon (cdr entry))))
|
|
default-icon-alist)))
|
|
(lambda (tag)
|
|
(cond ((assq tag alist) => cdr)
|
|
(else #f)))))
|
|
((list? find-icon)
|
|
(lambda (tag)
|
|
(cond ((assq tag find-icon) => cdr)
|
|
(else #f))))
|
|
(else (lambda (tag) #f))))
|
|
(parse-info-url
|
|
(cond
|
|
((procedure? parse-info) parse-info)
|
|
((list? parse-info) ; it's an info path
|
|
(lambda (url)
|
|
(values parse-info
|
|
(unescape-uri (http-url-search url)))))
|
|
(else
|
|
(let ((info-path
|
|
((infix-splitter ":")
|
|
(or (getenv "INFOPATH")
|
|
(begin
|
|
(format (current-error-port)
|
|
"~%Warning: environment variable INFOPATH is unset.~%")
|
|
"")))))
|
|
(lambda (url)
|
|
(values info-path
|
|
(unescape-uri (http-url-search url))))))))
|
|
(make-reference
|
|
(cond
|
|
((procedure? reference) reference)
|
|
((string? reference)
|
|
(lambda (url node-name)
|
|
(string-append reference node-name)))
|
|
(else
|
|
(lambda (url node-name)
|
|
(string-append "info?" node-name))))))
|
|
|
|
(lambda (path req)
|
|
(let ((request-method (request-method req)))
|
|
(cond
|
|
((string=? request-method "GET")
|
|
(with-fatal-error-handler
|
|
(lambda (c decline)
|
|
(cond
|
|
((info-gateway-error? c)
|
|
(apply http-error (status-code bad-gateway) req
|
|
(condition-stuff c)))
|
|
((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)
|
|
(emit-prolog out)
|
|
(receive (find-entry node-name) (parse-info-url (request-url req))
|
|
(display-node node-name
|
|
(file-finder find-entry)
|
|
(referencer make-reference (request-url req) out)
|
|
icon-name
|
|
out))
|
|
(with-tag out address ();; this is outside the html element?
|
|
(write-string address out)))))))
|
|
((or (string=? request-method "HEAD")
|
|
(string=? request-method "POST"))
|
|
(make-error-response (status-code method-not-allowed) req
|
|
"GET"))
|
|
(else
|
|
(make-error-response (status-code not-implemented) req)))))))
|
|
|
|
(define split-header-line
|
|
(let ((split (infix-splitter (make-regexp "(, *)|( +)|( *\t *)")))
|
|
(split-field (infix-splitter (make-regexp ": *"))))
|
|
(lambda (l)
|
|
(let ((fields (map split-field (split l))))
|
|
|
|
(define (search-field regexp)
|
|
(cond
|
|
((find (lambda (field)
|
|
(string-match regexp (car field)))
|
|
fields)
|
|
=> cadr)
|
|
(else #f)))
|
|
|
|
(values (search-field "[F|f]ile")
|
|
(search-field "[N|n]ode")
|
|
(search-field "[U|u]p")
|
|
(search-field "[P|p]rev(ious)?")
|
|
(search-field "[N|n]ext"))))))
|
|
|
|
(define (replace-if-empty-string s v)
|
|
(if (zero? (string-length s))
|
|
v
|
|
s))
|
|
|
|
(define (string-newline->space s)
|
|
(string-map (lambda (c)
|
|
(if (char=? c #\newline)
|
|
#\space
|
|
c))
|
|
s))
|
|
|
|
(define (parse-node-name node-name)
|
|
(cond
|
|
((string-match "^\\((.*)\\)(.*)$" (string-newline->space node-name))
|
|
=> (lambda (match)
|
|
(values
|
|
(replace-if-empty-string (match:substring match 1) #f)
|
|
(replace-if-empty-string (match:substring match 2) "Top"))))
|
|
(else (values #f (string-newline->space node-name)))))
|
|
|
|
|
|
(define (unparse-node-name file node)
|
|
(let* ((ext (file-name-extension file))
|
|
(file (if (string=? ext ".info")
|
|
(file-name-sans-extension file)
|
|
file)))
|
|
(receive (file node) (if (and (string=? "dir" file)
|
|
(not (string=? "" node))
|
|
(not (string=? "Top" node)))
|
|
(values node "Top")
|
|
(values file node))
|
|
(string-append "(" file ")" node))))
|
|
|
|
(define (display-icon file alt out)
|
|
(emit-tag out 'img
|
|
(cons 'src file)
|
|
(cons 'alt alt)
|
|
(cons 'align "bottom")))
|
|
|
|
(define (referencer make-reference old-entry out)
|
|
(lambda (file node-name label . maybe-icon)
|
|
(receive (node-file node) (parse-node-name node-name)
|
|
(let ((file (or node-file file)))
|
|
(with-tag out a ((href (make-reference
|
|
old-entry
|
|
(escape-uri (unparse-node-name file node)))))
|
|
(if (and (not (null? maybe-icon))
|
|
(car maybe-icon))
|
|
(display-icon (car maybe-icon) (cadr maybe-icon) out))
|
|
(emit-text label out))))))
|
|
|
|
(define node-prologue (ascii->char 31))
|
|
(define node-epilogue-regexp
|
|
(make-regexp
|
|
(string-append (regexp-quote (string node-prologue))
|
|
"|"
|
|
(regexp-quote (string (ascii->char 12))))))
|
|
|
|
(define (string-starts-with-char? s c)
|
|
(and (not (zero? (string-length s)))
|
|
(char=? c (string-ref s 0))))
|
|
|
|
(define (node-prologue? s)
|
|
(string-starts-with-char? s node-prologue))
|
|
(define (node-epilogue? s)
|
|
(regexp-exec node-epilogue-regexp s))
|
|
|
|
;; Document title
|
|
|
|
(define (display-title file node up previous next
|
|
display-reference icon-name out)
|
|
|
|
(define (maybe-display-header header icon alt)
|
|
(if header
|
|
(begin
|
|
(newline out)
|
|
(with-tag out b ()
|
|
(display-reference file header header icon alt)))))
|
|
|
|
(emit-title out (string-append "Info Node: "
|
|
(unparse-node-name file node)))
|
|
(with-tag out h1 ()
|
|
(emit-tag out 'img
|
|
(cons 'src (icon-name 'info))
|
|
(cons 'alt "Info Node")
|
|
(cons 'align 'bottom))
|
|
(write-string (unparse-node-name file node) out))
|
|
(emit-tag out 'hr)
|
|
(maybe-display-header next (icon-name 'next) "[Next]")
|
|
(maybe-display-header previous (icon-name 'previous) "[Previous]")
|
|
(maybe-display-header up (icon-name 'up) "[Up]")
|
|
|
|
(if (or next previous up)
|
|
(emit-tag out 'hr)))
|
|
|
|
;; Text
|
|
|
|
|
|
;; Dealing with cross references
|
|
;; info sucks
|
|
|
|
(define xref-marker-regexp (make-regexp "\\*[Nn]ote([ \n]|$)"))
|
|
(define xref-regexp (make-regexp "\\*[Nn]ote *([^:]*): *([^\t\n,.;:?!]*)"))
|
|
|
|
(define max-xref-lines 3)
|
|
|
|
(define complete-line
|
|
(let ((split-xref-markers (field-splitter xref-marker-regexp))
|
|
(split-xrefs (field-splitter xref-regexp))
|
|
(cr (string #\newline)))
|
|
(lambda (line port)
|
|
(let loop ((line line) (count max-xref-lines))
|
|
(let ((xref-markers (split-xref-markers line))
|
|
(xrefs (split-xrefs line)))
|
|
(if (= (length xref-markers) (length xrefs))
|
|
line
|
|
(if (zero? count)
|
|
(info-gateway-error "invalid cross reference")
|
|
(let ((new-line (read-line port)))
|
|
(if (eof-object? new-line)
|
|
(info-gateway-error
|
|
"unexpected end of info file inside cross reference"))
|
|
(loop (string-append line cr new-line) (- count 1))))))))))
|
|
|
|
|
|
(define (display-xref xref file display-reference out)
|
|
(let* ((match (regexp-exec xref-regexp xref))
|
|
(note (match:substring match 1))
|
|
(node-name (match:substring match 2))
|
|
(node-name (if (string=? "" node-name) note node-name))
|
|
(node-name (substring node-name
|
|
(string-skip node-name char-set:whitespace)
|
|
(string-length node-name))))
|
|
(emit-text "See " out)
|
|
(display-reference file node-name note)))
|
|
|
|
(define display-text
|
|
(let ((split-xrefs (infix-splitter xref-regexp #f 'split)))
|
|
(lambda (line port file display-reference out)
|
|
(let* ((line (complete-line line port))
|
|
(components (split-xrefs line)))
|
|
;; in components, every 2nd element is a cross reference
|
|
;; also, it always has odd length or length zero
|
|
(if (not (null? components))
|
|
(let loop ((components components))
|
|
(emit-text (car components) out)
|
|
(if (not (null? (cdr components)))
|
|
(begin
|
|
(display-xref (cadr components) file display-reference out)
|
|
(loop (cddr components))))))
|
|
(newline out)))))
|
|
|
|
;; Menus
|
|
|
|
(define menu-regexp (make-regexp "^\\* +Menu:"))
|
|
(define menu-item-regexp (make-regexp "^\\* +"))
|
|
|
|
(define (char-splitter c)
|
|
(lambda (s)
|
|
(cond ((string-index s c)
|
|
=> (lambda (i)
|
|
(values (substring s 0 i)
|
|
(substring s (+ 1 i) (string-length s)))))
|
|
(else (values s "")))))
|
|
|
|
(define colon-split (char-splitter #\:))
|
|
|
|
(define (display-menu-item-header line port file display-reference icon-name out)
|
|
(let ((menu-line-split (infix-splitter menu-item-regexp)))
|
|
(receive (note rest) (colon-split (cadr (menu-line-split line)))
|
|
(receive (node-name text)
|
|
(cond
|
|
((string-match ": *(.*)" rest)
|
|
=> (lambda (match)
|
|
(values note (match:substring match 1))))
|
|
((string-match "^ *([^.]*)\\.? *(.*)" rest)
|
|
=> (lambda (match)
|
|
(values (match:substring match 1)
|
|
(match:substring match 2))))
|
|
(else
|
|
(info-gateway-error "invalid menu item")))
|
|
(emit-tag out 'dt)
|
|
(display-reference file node-name note (icon-name 'menu) "*")
|
|
(newline out)
|
|
(if (and (not (string=? "" text))
|
|
(not (string=? "." text)))
|
|
(begin
|
|
(emit-tag out 'dd)
|
|
(display-text text port file display-reference out)))))))
|
|
|
|
(define (display-menu line port file display-reference icon-name out)
|
|
(emit-close-tag out 'pre)
|
|
|
|
(with-tag out dl ()
|
|
(let loop ((line line))
|
|
(if (eof-object? line)
|
|
(info-gateway-error "unexpected end of info file"))
|
|
|
|
(display-menu-item-header line port file display-reference icon-name out)
|
|
|
|
(let finish-item-loop ()
|
|
(if (eof-object? line)
|
|
(info-gateway-error "unexpected end of info file"))
|
|
|
|
(let ((line (read-line port)))
|
|
(cond
|
|
((or (eof-object? line)
|
|
(node-epilogue? line)
|
|
(string=? "" line))
|
|
(emit-tag out 'pre)
|
|
(dispatch-line line port file display-reference icon-name out))
|
|
((regexp-exec menu-item-regexp line)
|
|
(loop line))
|
|
(else
|
|
(display-text line port file display-reference out)
|
|
(finish-item-loop))))))))
|
|
|
|
;; Central dispatch
|
|
|
|
(define (dispatch-line line port file display-reference icon-name out)
|
|
(cond
|
|
((or (eof-object? line) (node-epilogue? line)) #f)
|
|
((string=? "" line) (emit-p out) #t)
|
|
((regexp-exec menu-regexp line) #t) ;; this should probably be expanded
|
|
((regexp-exec menu-item-regexp line)
|
|
(display-menu line port file display-reference icon-name out))
|
|
(else
|
|
(display-text line port file display-reference out) #t)))
|
|
|
|
(define (display-body port file display-reference icon-name out)
|
|
(let loop ()
|
|
(let ((line (read-line port)))
|
|
(if (dispatch-line line port file display-reference icon-name out)
|
|
(loop)))))
|
|
|
|
(define (display-node node-name find-file display-reference icon-name out)
|
|
(receive (file node) (parse-node-name node-name)
|
|
(receive (port file-header node-header up-header prev-header next-header)
|
|
(find-node file node find-file)
|
|
|
|
(with-tag out html (xmlnsdecl-attr)
|
|
(with-tag out head ()
|
|
(display-title file node-header up-header
|
|
prev-header next-header
|
|
display-reference icon-name
|
|
out))
|
|
(with-tag out body ()
|
|
(with-tag out pre ()
|
|
(display-body port file display-reference icon-name out))))
|
|
|
|
(close-input-port port))))
|
|
|
|
;; Finding nodes
|
|
|
|
(define (ensure-node-prologue port msg)
|
|
(let ((line (read-line port)))
|
|
(if (or (eof-object? line)
|
|
(not (node-prologue line)))
|
|
(info-gateway-error "invalid info file" msg))))
|
|
|
|
(define (ensure-regexp-line port regexp msg)
|
|
(let ((line (read-line port)))
|
|
(if (or (eof-object? line)
|
|
(not (string-match regexp line)))
|
|
(info-gateway-error "invalid info file" msg))))
|
|
|
|
(define (ensure-tag-table-node port)
|
|
(ensure-regexp-line port "^Tag Table:" "no tag table"))
|
|
(define (ensure-indirect-tag-table-header port)
|
|
(ensure-regexp-line port "^\\(Indirect\\)" "no indirect tag"))
|
|
|
|
(define split-indirection (infix-splitter (make-regexp " *: *")))
|
|
(define (parse-indirection line)
|
|
(let ((l (split-indirection line)))
|
|
(if (null? (cdr l))
|
|
(info-gateway-error "invalid indirection entry in info file")
|
|
(let ((file (car l))
|
|
(seek-pos (string->number (cadr l))))
|
|
(if (not seek-pos)
|
|
(info-gateway-error "invalid indirection entry in info file"))
|
|
(cons file seek-pos)))))
|
|
|
|
(define (read-indirection-table port)
|
|
(let loop ((table '()))
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(info-gateway-error "invalid info file"))
|
|
(if (node-epilogue? line)
|
|
(reverse table)
|
|
(loop (cons (parse-indirection line) table))))))
|
|
|
|
(define tag-seek-separator (ascii->char 127))
|
|
|
|
(define parse-tag
|
|
(let ((split (infix-splitter (make-regexp ", *")))
|
|
(split-field (infix-splitter ": "))
|
|
(split-node-info
|
|
(infix-splitter (string tag-seek-separator))))
|
|
|
|
(define (barf)
|
|
(info-gateway-error "invalid tag entry in info file"))
|
|
|
|
(lambda (line)
|
|
(let* ((fields (map split-field (split line)))
|
|
(file (cond
|
|
((assoc "File" fields)
|
|
=> (lambda (p)
|
|
(if (null? (cdr p)) (barf))
|
|
(cadr p)))
|
|
(else #f))))
|
|
(cond
|
|
((assoc "Node" fields)
|
|
=> (lambda (p)
|
|
(if (null? (cdr p)) (barf))
|
|
(let ((s (split-node-info (cadr p))))
|
|
(if (null? (cdr p)) (barf))
|
|
(let* ((node (car s))
|
|
(seek (string->number (cadr s))))
|
|
(if (not seek) (barf))
|
|
(values node file seek)))))
|
|
(else (barf)))))))
|
|
|
|
(define (find-tag node port)
|
|
(let loop ()
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(info-gateway-error "invalid info file"))
|
|
(if (regexp-exec node-epilogue-regexp line)
|
|
(http-error (status-code not-found) #f "node not found"))
|
|
(receive (entry-node file seek) (parse-tag line)
|
|
(if (string=? node entry-node)
|
|
(cons file seek)
|
|
(loop))))))
|
|
|
|
(define (find-indirection-entry seek-pos indirection-table)
|
|
(let loop ((table indirection-table))
|
|
(if (null? table)
|
|
(http-error (status-code not-found) #f "node not found"))
|
|
(let* ((entry (car table))
|
|
(pos (cdr entry)))
|
|
(if (and (>= seek-pos pos)
|
|
(or (null? (cdr table))
|
|
(let* ((next-entry (cadr table))
|
|
(next-pos (cdr next-entry)))
|
|
(< seek-pos next-pos))))
|
|
entry
|
|
(loop (cdr table))))))
|
|
|
|
(define (file-finder with)
|
|
(cond ((procedure? with) with)
|
|
((list? with)
|
|
(lambda (file)
|
|
(find-info-file file with)))))
|
|
|
|
(define (find-node-port-with-tag-entry node tag-entry ? find-file)
|
|
(let* ((port (if (input-port? ?) ? #f))
|
|
(indirection-table (if port #f ?))
|
|
(seek-pos (cdr tag-entry))
|
|
(indirection-entry
|
|
(and indirection-table
|
|
(find-indirection-entry seek-pos indirection-table)))
|
|
(seek-pos (if indirection-entry
|
|
(- seek-pos (cdr indirection-entry))
|
|
seek-pos))
|
|
;; that's what the documentation says ...
|
|
(seek-pos (if (>= seek-pos 1000)
|
|
(- seek-pos 1000)
|
|
0))
|
|
(file (or (car tag-entry)
|
|
(and indirection-entry
|
|
(car indirection-entry))))
|
|
(port (if file
|
|
(begin
|
|
(if port (close-input-port port))
|
|
(open-input-file (find-file file)))
|
|
port)))
|
|
(seek port seek-pos)
|
|
port))
|
|
|
|
(define (find-node file node find-file)
|
|
(if (not file)
|
|
(http-error (status-code not-found) #f
|
|
"no file in info node specification"))
|
|
|
|
(let* ((fname (find-file file))
|
|
(port (open-input-file fname)))
|
|
(let loop ((port port))
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(http-error (status-code not-found) #f "info node not found"))
|
|
(if (node-prologue? line)
|
|
(let ((header (read-line port)))
|
|
(if (eof-object? header)
|
|
(info-gateway-error "invalid info file"))
|
|
(cond
|
|
|
|
((string-match "^Indirect:" header)
|
|
(let ((indirection-table
|
|
(read-indirection-table port)))
|
|
(ensure-tag-table-node port)
|
|
(ensure-indirect-tag-table-header port)
|
|
(let ((tag-entry (find-tag node port)))
|
|
(close-input-port port)
|
|
(loop (find-node-port-with-tag-entry
|
|
node tag-entry indirection-table find-file)))))
|
|
|
|
((string-match "^Tag Table:" header)
|
|
(let ((tag-entry (find-tag node port)))
|
|
(loop (find-node-port-with-tag-entry
|
|
node tag-entry port find-file))))
|
|
|
|
((string-match "^File:" header)
|
|
(receive
|
|
(file-header node-header up-header prev-header next-header)
|
|
(split-header-line header)
|
|
(if (string=? node-header node)
|
|
(values port
|
|
file-header node-header
|
|
up-header prev-header next-header)
|
|
(loop port))))
|
|
(else (loop port))))
|
|
(loop port))))))
|
|
|
|
;; Finding files
|
|
|
|
(define (info-file-alternative-names file)
|
|
(receive (dir base ext) (parse-file-name file)
|
|
(let* ((base
|
|
(cond ((string-match "(.*)-info$" base)
|
|
=> (lambda (match)
|
|
(match:substring match 1)))
|
|
(else base)))
|
|
(base-ci (string-map char-downcase base))
|
|
(alts-1 (if (string=? base base-ci)
|
|
(list base)
|
|
(list base base-ci)))
|
|
(alts (append alts-1
|
|
(map (lambda (base)
|
|
(string-append base ".info"))
|
|
alts-1)))
|
|
(alts (append alts
|
|
(map (lambda (base)
|
|
(string-append base "-info"))
|
|
alts-1)))
|
|
(alts (map (lambda (f) (string-append dir f)) alts))
|
|
(alts (cons file alts)))
|
|
alts)))
|
|
|
|
(define (find-info-file file info-path)
|
|
(let ((alts (info-file-alternative-names file)))
|
|
(let path-loop ((path info-path))
|
|
(if (null? path)
|
|
(http-error (status-code not-found) #f "info file not found"))
|
|
(let alt-loop ((alts alts))
|
|
(if (null? alts)
|
|
(path-loop (cdr path))
|
|
(let ((try (string-append (file-name-as-directory (car path))
|
|
(car alts))))
|
|
(if (file-exists? try)
|
|
try
|
|
(alt-loop (cdr alts)))))))))
|