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(* Forum -- forum subapp
Copyright (C) 2013 Benjamin Barenblat <bbaren@mit.edu>
This file is a part of 6.947.
6.947 is is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option) any
later version.
6.947 is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU Affero General Public License for more
details.
You should have received a copy of the GNU Affero General Public License along
with 6.947. If not, see <http://www.gnu.org/licenses/>. *)
functor Make(Template : sig
val generic : option string -> xbody -> page
end) = struct
open Styles
open Author
style entryList
style entryMetadata
style entryTitle
style entryBody
table entry : { Id : int,
References : option int,
Class : EntryClass.entryClass,
Title : string,
Body : string,
Author : author
} PRIMARY KEY Id
sequence entryIdS
(* Grabs real name out of MIT certificate. *)
val getName : transaction (option string) =
getenv (blessEnvVar "SSL_CLIENT_S_DN_CN")
(***************************** Single questions ******************************)
fun detail (id : int) : transaction page =
authorOpt <- getName;
questionBlock <- queryX (SELECT * FROM entry
WHERE Entry.Class = {[EntryClass.question]}
AND Entry.Id = {[id]}) (fn q =>
<xml>
<h2>{[q.Entry.Title]}</h2>
<p>{[q.Entry.Body]}</p>
<p class={entryMetadata}>Asked by {[q.Entry.Author]}</p>
</xml>);
answerBlock <- queryX (SELECT * FROM entry
WHERE Entry.Class = {[EntryClass.answer]}
AND Entry.References = {[Some id]}) (fn a =>
<xml>
<p>
{[a.Entry.Body]}
<span class={entryMetadata}>—{[a.Entry.Author]}</span>
</p>
</xml>);
return (
Template.generic (Some "Forum") <xml>
<div class={content}>
{questionBlock}
<div>{answerBlock}</div>
<h3>Your answer</h3>
<form>
<textarea {#Body} class={entryBody} /><br />
Answering as:
<select {#Author}>
{case authorOpt of
None => <xml/>
| Some nam => <xml><option>{[nam]}</option></xml>}
<option>Anonymous</option>
</select>
<submit action={reply id} value="Answer" />
</form>
</div>
</xml>
)
and reply qId submission =
id <- nextval entryIdS;
dml (INSERT INTO entry (Id, References, Class, Title, Body, Author)
VALUES ({[id]},
{[Some qId]},
{[EntryClass.answer]},
{[""]},
{[submission.Body]},
{[readError submission.Author]}));
detail qId
(**************************** Lists of questions *****************************)
fun prettyPrintQuestion row : xbody =
<xml>
<li>
<h3><a link={detail row.Entry.Id}>{[row.Entry.Title]}</a></h3>
{[row.Entry.Body]}
<span class={entryMetadata}>Asked by {[row.Entry.Author]}</span>
</li>
</xml>
val allQuestions : transaction page =
questionsList <- queryX (SELECT * FROM entry
WHERE Entry.Class = {[EntryClass.question]}
ORDER BY Entry.Id DESC)
prettyPrintQuestion;
return (
Template.generic (Some "Forum – All questions") <xml>
<div class={content}>
<h2>All questions</h2>
<ul class={entryList}>
{questionsList}
</ul>
</div>
</xml>
)
fun main () : transaction page =
newestQuestions <- queryX (SELECT * FROM entry
WHERE Entry.Class = {[EntryClass.question]}
ORDER BY Entry.Id DESC
LIMIT 5)
prettyPrintQuestion;
askerOpt <- getName;
return (
Template.generic (Some "Forum") <xml>
<div class={content}>
<h2>Latest questions</h2>
<ul class={entryList}>
{newestQuestions}
</ul>
<a link={allQuestions}>View all questions</a>
<h2>Ask a new question</h2>
<form>
<textbox {#Title} placeholder="Title" class={entryTitle} /><br />
<textarea {#Body} class={entryBody} /><br />
Asking as:
<select {#Author}>
{case askerOpt of
None => <xml/>
| Some nam => <xml><option>{[nam]}</option></xml>}
<option>Anonymous</option>
</select>
<submit action={ask} value="Ask" />
</form>
</div>
</xml>
)
and ask submission =
id <- nextval entryIdS;
dml (INSERT INTO entry (Id, References, Class, Title, Body, Author)
VALUES ({[id]},
{[None]},
{[EntryClass.question]},
{[submission.Title]},
{[submission.Body]},
{[readError submission.Author]}));
main ()
end
|
