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#! /usr/bin/env clisp
;;;; -*- coding: utf-8; mode: lisp -*-
;;;; Copyright 2007, Matthias Andreas Benkard.
;;; TAKE NOTICE: If you want to run this script from the command line or
;;; from a web server, be sure to use a core image including the systems
;;; this script depends upon. The DEFSYSTEM form below has mainly been
;;; written for purposes of documentation.
(asdf:defsystem #:mulk.journal
:description "Matthias Benkard's simple web journal engine"
:licence "Affero General Public License, version 1 or higher"
:depends-on (#:cl-ppcre #:cl-fad #:iterate #:cl-markdown #:parenscript
#:yaclml #:lisp-cgi-utils))
;;; The following does not generally work in a CGI setting because of
;;; security restrictions. Loading all the dependencies individually
;;; rather than using a core image would certainly be too slow for any
;;; serious CGI usage, anyway, so what the heck.
#+nil (asdf:oos 'asdf:load-op '#:mulk.journal)
(defpackage #:mulk.journal
(:nicknames #:journal)
(:use #:cl #:fad #:iterate #:markdown #:yaclml #:http))
(in-package #:mulk.journal)
(defun keywordify (thing)
(if (null thing)
thing
(intern (etypecase thing
(string (string-upcase thing))
(symbol (symbol-name thing)))
'#:keyword)))
(defparameter *query*
(mapcan #'(lambda (param)
(list (keywordify param)
(http-query-parameter param)))
(http-query-parameter-list))
"The HTTP query string transformed into a property list.")
(defparameter *action*
(keywordify (getf *query* :action))
"One of NIL, :INDEX, :VIEW-ATOM-FEED, :VIEW, :POST, :EDIT, and :PREVIEW.")
(defparameter *post-number*
(parse-integer (getf *query* :post "")
:junk-allowed t #|| :radix 12 ||#)
"The identification number of the journal entry to be acted upon.
May be NIL.")
(defparameter *method*
(keywordify (gethash "REQUEST_METHOD" (http-get-env-vars)))
"One of :GET, :POST, :PUT, and :DELETE.")
(defparameter *journal-entries*
'()
"A list of JOURNAL-ENTRY objects.")
(defparameter *http-env*
(http-get-env-vars)
"A hash table of HTTP environment variables.")
(defclass journal-entry ()
((id :type (integer 0)
:accessor id-of
:initarg :id)
(title :type string
:accessor title-of
:initarg :title
:initform "")
(body :type string
:accessor body-of
:initarg :body
:initform "")
(categories :type list
:accessor categories-of
:initarg :categories
:initform '())))
(defmethod shared-initialize ((journal-entry journal-entry) slot-names
&key)
(with-slots (id) journal-entry
(when (or (eq slot-names t)
(member 'id slot-names))
(setf id (1+ (reduce #'max *journal-entries*
:key #'id-of
:initial-value -1)))))
(call-next-method))
(defun fixup-markdown-output (markup)
;; No, cl-markdown is certainly not perfect.
;;
;; First, convert "<a ...> bla</a>" into " <a ...>bla</a>" (note the
;; excess space to the right of the opening tag in the unprocessed
;; string, which we move to the left of the same opening tag, where we
;; expect it to make more sense in the general case).
(loop
for matches = (ppcre:all-matches "<a [^>]*?> " markup)
while (not (null matches))
do (progn
(setf markup #+nil
(delete-if (constantly t)
markup
:start (1- (second matches))
:end (second matches))
(replace markup markup :start1 (1+ (first matches))
:end1 (second matches)
:start2 (first matches)
:end2 (1- (second matches))))
(setf (elt markup (first matches)) #\Space)))
markup)
(defun journal-markup->html (markup)
(if (string= "" markup)
markup
(handler-bind
((error ;; method-call-type-error or not
;; Work around a weird bug in cl-markdown or CLISP. (I
;; don't know which.)
#'(lambda (c)
(declare (ignore c))
#+nil (<:as-html
(with-output-to-string (s)
(system::pretty-print-condition c s)))
(invoke-restart 'return nil))))
(fixup-markdown-output
(with-output-to-string (s)
;; Normally, we shouldn't need to create our own stream to
;; write into, but this is, of course, yet another
;; CLISP/Markdown hack, because Markdown's default
;; *OUTPUT-STREAM* seems to spontaneously close itself, making
;; everything break when Markdown tries to render more stuff.
(markdown markup :stream s))))))
(defun read-journal-entry (filename)
(with-open-file (file filename :direction :input
:external-format #+clisp charset:utf-8
#+sbcl :utf-8)
(let ((*read-eval* nil))
(let ((data (read file)))
(apply #'make-instance 'journal-entry data)))))
(defun read-journal-entries ()
(let ((directory
(make-pathname
:directory (pathname-directory
(merge-pathnames
(make-pathname :directory '(:relative "journal-entries")
:name nil)
(pathname-as-file
(or (gethash "SCRIPT_FILENAME" *http-env*)
"/home/mulk/Dokumente/Projekte/Mulkblog/journal.cgi"))))))
(journal-entries (list)))
(when (file-exists-p directory)
(walk-directory directory
#'(lambda (x)
(push (read-journal-entry x) journal-entries))
:test (complement #'directory-pathname-p)))
(sort journal-entries #'>= :key #'id-of)))
(defun show-atom-feed ()
(http-add-header "Content-type" "text/xml; charset=UTF-8")
(http-send-headers))
(defun show-web-journal ()
(http-add-header "Content-type" "text/html; charset=UTF-8")
(http-send-headers)
(<:html
(<:body
(<:h1 :id :main-title "Kompottkins Weisheiten")
(<:div :id :contents
(if (or (null *action*)
(eq *action* :index))
(dolist (journal-entry *journal-entries*)
(<:div :class :journal-entry
(<:h2 (<:as-html (title-of journal-entry)))
(<:as-is (journal-markup->html (body-of journal-entry)))))))
(<:div :id :navigation)
(loop for (x . y) in `(("Action" . ,*action*)
("Request method" . ,*method*)
("Query" . ,*query*)
("Query string" . ,(http-get-query-string))
("Environment" . ,(http-get-env-vars)))
do (<:p
(<:hr)
(<:h2 (<:as-html x))
(<:p "Type " (<:em (<:as-html (type-of y))) ".")
(<:pre (<:as-html (prin1-to-string y))))))))
(defun main ()
(let ((*journal-entries* (read-journal-entries)))
(case *action*
(:view-atom-feed (show-atom-feed))
(otherwise (show-web-journal)))))
(handler-bind
((error #'
(lambda (e)
(<:html
(<:head
(<:title "Kompottkins Weisheiten: Fehler"))
(<:body
(<:h1 "Kompottkins Weisheiten: Fehlerbericht")
(<:p "Leider ist waehrend der Bearbeitung Ihrer Anfrage ein
Fehler aufgetreten. Wir bitten dies zu entschuldigen.
Ein detaillierter Fehlerbericht folgt.")
(<:pre (<:as-html (with-output-to-string (out)
#+clisp (system::pretty-print-condition e out)
#+clisp (system::print-backtrace :out out)))))))))
(main))
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