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wiki.ss
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(library (lambda wiki)
(export wiki-main wiki-data-direcoty wiki-top-url
spam-block-question spam-block-answer)
(import (rnrs)
(rnrs mutable-pairs)
(only (system) get-environment-variable make-parameter)
(only (srfi :1) first second third alist-cons)
(only (srfi :2) and-let*)
(only (mosh) assoc-ref read-line string-split format call-with-string-input-port string->regexp rxmatch)
(only (mosh file) directory-list file->string write-to-file)
(prefix (mosh cgi) cgi:))
;; Configuration
(define wiki-data-direcoty (make-parameter #f))
(define wiki-top-url (make-parameter #f))
(define spam-block-question
(make-parameter #f
(lambda (x)
(when (and x (not (string? x)))
(error 'spam-block-question "should be string"))
x)))
(define spam-block-answer
(make-parameter #f (lambda (x)
(when (and x (not (string? x)))
(error 'spam-block-answer "should be string"))
x)))
(define (print msg)
(display msg)
(newline))
(define (add-to-list lst a)
(append lst (list a)))
;;; reader for unread-line
(define (make-reader port)
(cons port '()))
(define (reader-port r)
(car r))
(define (reader-buffer-empty? r)
(null? (cdr r)))
(define (pop-reader-buffer! r)
(let ([ret (car (cdr r))]
[rest (cdr (cdr r))])
(set-cdr! r rest)
ret))
(define (unread-line-reader! r line)
(if (eof-object? line)
'()
(set-cdr! r (cons line (cdr r)))))
(define (read-line-reader r)
(if (reader-buffer-empty? r)
(read-line (reader-port r))
(pop-reader-buffer! r)))
;;; Wiki plugin
(define *plugins* '())
(define (define-plugin name inline-proc url-proc)
(list name inline-proc url-proc))
(define (plugin-inline-proc plugin)
(second plugin))
(define (plugin-name plugin)
(first plugin))
(define (plugin-url-proc plugin)
(third plugin))
(define (register-plugin plugin)
(set! *plugins* (alist-cons (plugin-name plugin) plugin *plugins*)))
(define (get-plugin name)
(assoc-ref *plugins* name))
;;; Wiki parser
(define (wiki-parse r)
(define (parse-list match reader)
(define (iter ulp reader nest-level)
(let loop ([l (read-line-reader reader)]
[li-lst '()])
(cond [(eof-object? l)
(list (if ulp 'ul 'ol) nest-level (reverse li-lst))]
[else
(let* ([reg (if ulp #/^(-+)/ #/^(\++)/)]
[o-reg (if ulp #/^(\++)/ #/^(\-+)/)]
[match (reg l)]
[o-match (o-reg l)]
[level (if match
(string-length (match))
(if (and o-match (> (string-length (o-match)) nest-level))
(string-length (o-match))
0))])
(cond [(zero? level) ;; next is not list syntax
(unread-line-reader! reader l)
(list (if ulp 'ul 'ol) nest-level (reverse li-lst))]
[(= level nest-level) ;; same nest-level list
(loop (read-line-reader reader) (cons (make-li (wiki-parse-inline (match 'after))) li-lst))]
[(< level nest-level) ;; nest-level is shallower, so close.
(unread-line-reader! reader l)
(list (if ulp 'ul 'ol) nest-level (reverse li-lst))]
[else ;; nest-level is deeper, so include.
(unread-line-reader! reader l)
(let ([deeper-lst (parse-list (if match match o-match) reader)])
(loop (read-line-reader reader) (cons (add-li-body (car li-lst) deeper-lst) (cdr li-lst)))
)]))])))
(iter (#/-+/ (match)) reader (string-length (match))))
(define (parse-pre reader)
(let loop ([line (read-line-reader reader)]
[pre-lines '()])
(cond [(eof-object? line)
(list 'pre pre-lines)]
[(rxmatch #/^ / line)
(loop (read-line-reader reader)
(append pre-lines (list (cgi:escape line))))]
[else
(unread-line-reader! reader line)
(list 'pre pre-lines)])))
(let loop ([parsed '()]
[line (read-line-reader r)]
[text '()])
(cond [(eof-object? line)
(add-to-list parsed (list 'p text))]
[else
(let ([line (cgi:escape line)])
(cond [(#/^(-+)/ line) => (lambda (match) ;; list syntax
(unread-line-reader! r line)
(loop (add-to-list (add-to-list parsed (list 'p text))
(parse-list match r))
(read-line-reader r)
'()))]
[(#/^(\++)/ line) => (lambda (match) ;; list syntax
(unread-line-reader! r line)
(loop (add-to-list (add-to-list parsed (list 'p text))
(parse-list match r))
(read-line-reader r)
'()))]
[(#/^(\*+)/ line) => (lambda (match) ;; h1/h2/h3 syntax
(loop (add-to-list (add-to-list parsed (list 'p text))
(make-head match))
(read-line-reader r)
'()))]
[(rxmatch #/^ / line) => (lambda (match) ;; pre syntax
(unread-line-reader! r line)
(loop (add-to-list (add-to-list parsed (list 'p text))
(parse-pre r))
(read-line-reader r)
'()))]
[(#/^#([^(^)^\s]+)(?:\(([^\)]+)\))?/ line) => (lambda (match) ;; plugin syntax
(let ([plugin
(if (match 2)
(list 'plugin (match 1) (string-split (match 2) #\,))
(list 'plugin (match 1)))])
(loop (add-to-list (add-to-list parsed (list 'p text))
plugin)
(read-line-reader r)
'())))]
[(#/^\r$/ line)
(loop (add-to-list parsed (list 'p text))
(read-line-reader r)
'())]
[else
(loop parsed (read-line-reader r) (append text (list (wiki-parse-inline line))))])
)])))
(define (wiki-parse-inline content)
(cond [(#/\[\[([^>^\]]+)>(https?:\/\/[^\]^\s]+)\]\]/ content) => make-alias-link] ;; [[alias>http://example.com]]
[(#/\[\[([^\]]+)\]\]/ content) => make-wiki-name] ;; [[wiki-name]]
[(#/https?:\/\/[^\s\)]+/ content) => make-link] ;; http://example.com
[(#/&new\{([^\}]+)\}\;/ content) => make-amp]
[else (if (equal? "" content) "" (make-inline content))]))
(define (make-li body)
(list 'li (list body)))
(define (add-li-body li body)
(list 'li (append (cadr li) (list body))))
(define (make-head match)
(list 'head
(string-length (match))
(wiki-parse-inline (match 'after))))
(define (make-wiki-name m)
(make-inline
(wiki-parse-inline (m 'before))
(list 'wiki-name
(m 1))
(wiki-parse-inline (m 'after))))
(define make-inline
(lambda args
(list 'inline (remp (lambda (s)
(and (string? s) (= (string-length s) 0))) args))))
(define (make-alias-link m)
(make-inline
(wiki-parse-inline (m 'before))
(list 'link (m 1) (m 2))
(wiki-parse-inline (m 'after))))
(define (make-amp match)
(make-inline
(wiki-parse-inline (match 'before))
(list 'new (match 1))
(wiki-parse-inline (match 'after))))
(define (make-link m)
(make-inline
(wiki-parse-inline (m 'before))
(list 'link (m) (m))
(wiki-parse-inline (m 'after))))
(define (page-exist? page-name)
(find (lambda (s) (equal? page-name s)) (wiki-enum-pages)))
(define (wiki->html get-parameter page-name wiki)
(define (iter wiki)
(if (string? wiki)
(format #t "~a" wiki)
(case (first wiki)
[(p)
(unless (null? (second wiki))
(display "<p>")
(for-each iter (second wiki))
(print "</p>"))]
[(head)
(format #t "<h~d>" (second wiki))
(iter (third wiki))
(format #t "</h~d>\n" (second wiki))]
[(ul)
(format #t "\n<ul class='list~d'>" (second wiki))
(for-each iter (third wiki))
(print "</ul>")]
[(ol)
(format #t "<ol class='list~d'>" (second wiki))
(for-each iter (third wiki))
(print "</ol>")]
[(li)
(print "<li>")
(for-each iter (second wiki))
(print "</li>\n")]
[(inline)
(for-each iter (second wiki))]
[(wiki-name)
(let ([page-name (second wiki)])
(cond [(page-exist? page-name)
(print-a (format "~a/~a" (wiki-top-url) (cgi:encode page-name)) page-name)]
[else
(display "<span class=\"no-exist\">")
(print page-name)
(print-a (format "~a/~a" (wiki-top-url) (cgi:encode page-name)) "?")
(print "</span>")]))]
[(link)
(format #t "<a href='~a'>~a</a>" (second wiki) (third wiki))]
[(new)
(format #t "<strong>~a</strong>" (second wiki))]
[(plugin)
(let ([plugin (get-plugin (second wiki))])
(cond [plugin
((plugin-inline-proc plugin) get-parameter page-name (cddr wiki))]
[else
(format #t "~a plugin not found" (second wiki))
]))]
[(pre)
(print "<pre>")
(for-each display (second wiki))
(print "</pre>")
]
[else
(cond [(string? (first wiki))
(format #t "<p>~a</p>" (first wiki))]
[else
(format #t "unknown element wiki [[~a]]" (car wiki))])])))
(for-each iter wiki))
(define (page-name->path page-name)
(string-append (wiki-data-direcoty) "/" (cgi:encode page-name) ".dat"))
(define (wiki-enum-pages)
(map cgi:decode
(map (lambda (f) ((#/\.dat$/ f) 'before))
(filter (lambda (f) (#/\.dat$/ f))
(directory-list (wiki-data-direcoty))))))
(define (print-a uri text)
(format #t "<a href='~a'>~a</a>" uri text))
(define (read-raw-page page-name)
(file->string (page-name->path page-name)))
;; page-name should be not encoded
(define (print-edit-form page-name)
(format #t "<h1>Edit ~a</h1>" (cgi:escape page-name))
(format #t "<form method='POST' action='~a/~a/post'>\n <textarea cols=50 rows=20 name='body'>~a</textarea>\n<input class='submit' type='submit' value='post'>\n" (wiki-top-url) (cgi:encode page-name) (read-raw-page page-name))
(when (and (spam-block-answer) (spam-block-question))
(format #t "~a<input type='password' name='answer'>" (spam-block-question)))
(format #t "<input type='hidden' name='cmd' value='post'>\n <input type='hidden' name='page' value='~a'>\n</form>" page-name))
(define (print-page get-parameter page-name)
(let ([path (page-name->path page-name)])
(if (file-exists? path)
(call-with-input-file path
(lambda (p)
(let ([r (make-reader p)])
(wiki->html get-parameter page-name (wiki-parse r)))))
(begin (format #t "<p class='notice'>~s doesn't exist. Please create with following form.</p>" page-name)
(print-edit-form page-name)))))
(define (print-header . args)
(define (top-menu url label)
(format #t "<li><a href='~a'>~a</a></li>\n" url label))
(print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\"
\"http://www.w3.org/TR/html4/strict.dtd\">
<html lang=\"ja\">
<head>
<meta HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=utf-8\">")
(format #t "<title>~a - Lambda Wiki</title>" (if (null? args) "Lambda Wiki" (cgi:escape (car args))))
(print "<link REL=\"stylesheet\" href=\"/wiki.css\" TYPE=\"TEXT/CSS\">
<meta http-equiv=\"content-style-type\" content=\"text/css\">
</head>
<body>
<div id=\"header\">
<h1>L<span class=\"first\">a</span>mbd<span class=\"second\">a</span> Wiki</h1>
<div id=\"topmenu\">
<ul>")
(top-menu (wiki-top-url) "Top")
(top-menu (format "~a/page/create" (wiki-top-url)) "Create")
(unless (null? args)
(top-menu (format "~a/~a/edit" (wiki-top-url) (car args)) "Edit")
(top-menu (format "~a/~a" (wiki-top-url) (car args)) "Reload"))
(print (format "<li id=\"menu_left\"><a href=\"~a/page/list\">List</a></li>" (wiki-top-url)))
(print "</ul>
</div><!-- topmenu -->
</div>
<div id=\"navigation\" style=\"clear:both;\">
<div id=\"mynavi\">
<ul>
</ul>
</div>
</div>
<div id=\"contents\">
<div id=\"mymain\">
<div class=\"contents\">"))
(define (print-footer)
(print "</div>
</div>
<div id=\"footer\"><p>powered by <a href=\"http://code.google.com/p/mosh-scheme/\">Mosh</a> Scheme</p></div>
</body>
</html>"))
(define (write-page page-name content)
(call-with-output-file (page-name->path page-name)
(lambda (port)
(display content port))))
(define (print-new-page-form page-name)
(format #t "<form method='GET' action='~a/page/create'>" (wiki-top-url) page-name)
(print "<input type='text' name='page' value=''><input class='submit' type='submit' value='next'></form>"))
(define (list-page . reg)
(let ([pages (if (null? reg) (wiki-enum-pages) (filter (first reg) (wiki-enum-pages)))])
(print "<h1>List</h1>")
(print "<ul>")
(for-each (lambda (f)
(print "<li>")
(print-a (format "~a/~a" (wiki-top-url) (cgi:encode f)) f)
(print "</li>"))
pages)
(print "</ul>")))
(define (p2 str)
(cgi:header)
(print str))
(define (save-or-delete-file path body)
(define (backup-file-path path)
(format "~a.bak" path))
(cond
[(and (file-exists? path) (zero? (string-length body)))
(write-to-file (backup-file-path path) (file->string path))
(delete-file path)]
[else
(let ([prev-body (if (file-exists? path) (file->string path) #f)]
[backup-file (backup-file-path path)])
(write-to-file path body)
(when (and prev-body backup-file)
(write-to-file backup-file prev-body)))]))
(define (wiki-main)
(define (get-page-cmd)
;; N.B. PATH_INFO is NOT uri encoded.
(let ([path-info (get-environment-variable "PATH_INFO")])
(cond
[path-info
(let ([it (#/\/([^\/]+)\/(edit|page|list|post|plugin|create)/ path-info)])
(if it
(values (it 1) (it 2))
(let ([it (#/\/(.+)/ path-info)])
(if it
(values (it 1) "show")
(values "TopPage" "show")))))]
[else
(values "TopPage" "show")])))
(when (or (not (wiki-data-direcoty) (not (file-exists? (wiki-data-direcoty)))))
(cgi:header)
(format #t "lambda wiki wiki-data-direcoty ~s not found\n" (wiki-data-direcoty)))
(let-values (([get-parameter get-request-method] (cgi:init))
([page-name cmd] (get-page-cmd)))
(cond
[(and (equal? "post" cmd) (eq? 'POST (get-request-method)))
(cond
[(and (spam-block-answer) (spam-block-question))
(if (and-let* ([body (get-parameter "body")]
[answer (get-parameter "answer")] ;; check spam
[(string=? answer (spam-block-answer))])
(save-or-delete-file (page-name->path page-name) (cgi:decode body)))
(cgi:moved-temporarily-header (format "~a/~a" (wiki-top-url) (cgi:encode page-name)))
(begin (cgi:unauthorized-header)
(display "Lambda wiki:unauthorized post")))]
[else
(and-let* ([body (get-parameter "body")])
(save-or-delete-file (page-name->path page-name) (cgi:decode body)))
(cgi:moved-temporarily-header (format "~a/~a" (wiki-top-url) (cgi:encode page-name)))])]
[(equal? "plugin" cmd)
(let ([plugin (get-plugin (get-parameter "plugin"))])
(cond [plugin
((plugin-url-proc plugin) get-parameter page-name)]
[else
(cgi:header)
(print (string-append (get-parameter "plugin") " plugin not found"))
]))]
[else
(cgi:header)
(print-header page-name)
(cond
[(equal? "edit" cmd) (print-edit-form page-name)]
[(equal? "create" cmd)
(let ([it (get-parameter "page")])
(if it
(print-edit-form (cgi:decode it))
(print-new-page-form page-name)))]
[(equal? "list" cmd) (list-page)]
[else
(print-page get-parameter page-name)])
(print-footer)])))
(register-plugin (define-plugin "ls2"
(lambda (get-parameter page-name . args)
(let ([reg (string->regexp (if (null? args) (string-append "^" page-name "/") (first args)))])
(list-page reg)))
(lambda (get-parameter page-name) #f)))
(register-plugin (define-plugin "comment"
(lambda (get-parameter page-name . args)
(let ([comment-page (format "comment/~a" (cgi:encode page-name))])
(print-a (format "~a/~a" (wiki-top-url) comment-page)
"See comment page")
(print
(string-append
"<br><br>"
"<form method='POST' action='" (wiki-top-url) "/" page-name "/plugin'>\n"
"<input type='hidden' name='cmd' value='plugin'>\n"
"<input type='hidden' name='plugin' value='comment'>\n"
"<input type='hidden' name='page' value='" page-name "'>\n"
"Name: <input name='name' size='15' type='text'> <input name='msg' size='70' type='text'>"
"<input value='Post Comment' type='submit' class=\"submit\">"
"</form>\n"
))
(call-with-string-input-port (cgi:escape (read-raw-page comment-page))
(lambda (port)
(wiki->html get-parameter page-name (wiki-parse (make-reader port)))))))
(lambda (get-parameter page-name)
(let ([name (get-parameter "name")]
[msg (get-parameter "msg")]
[comment-page (string-append "comment/" page-name)])
(write-page comment-page
(format
"-~a -- [[~a]]\n~a" (cgi:decode msg) (cgi:decode name) (read-raw-page comment-page)))
(print (cgi:moved-temporarily-header (format "~a/~a" (wiki-top-url) (cgi:encode page-name))))))))
(register-plugin (define-plugin "topicpath"
(lambda (get-parameter page-name . args)
(let loop ([parent ""]
[paths (string-split page-name #\/)])
(if (null? paths)
'()
(cond [(equal? parent "")
(print-a "/wiki" "Top")
(print " / ")
(print-a (format "~a/~a" (wiki-top-url) (cgi:encode (car paths))) (car paths))
(loop (car paths) (cdr paths))]
[else
(print " / ")
(print-a (format "~a/~a" (wiki-top-url) (cgi:encode (format "~a/~a" parent (car paths)))) (car paths))
(loop (format "~a/~a" parent (car paths)) (cdr paths))]))))
(lambda (get-parameter page-name) #f)
))
)