The SWI-Prolog web-site

This repository contains the software of http://www.swi-prolog.org. The (wiki) content of the website and required add-ons are stored in git submodules. These must be installed separately using the command below. To install the site from scratch locally, perform the following commands:

Downloading the site

% git clone https://github.com/SWI-Prolog/plweb.git
% cd plweb
% git submodule update --init

For a full installation, install the dynamic data. The .db files must be writeable by the server process.
<dl> <dt>annotations.db</dt> <dd>Comments on web pages</dd> <dt>tags.db</dt> <dd>Tags on web pages</dd> <dt>openid.db</dt> <dd>User administration</dd> <dt>packs.db</dt> <dd>Known packages</dd> <dt>post.db</dt> <dd>News posts</dd> <dt>reviews.db</dt> <dd>Pack reviews</dd> <dt>download</dt> <dd>Points to the download directory</dd> </dl>

Install the download descriptions by running the script install-custom
Create directories for logging and pack mirrors. These directories must be writeable by the server and new directories created below must have the same permissions:
```
% mkdir log pack
% chgrp www-data log pack
% chmod g+ws log pack
```

Running the site

After installation, the website may be started locally using the commands below. After that, you have access to the same content as available from https://www.swi-prolog.org, except for the download section of the website. The default port of the site is 3040, and therefore it may be accessed on http://localhost:3040/

% swipl -l load.pl
?- server.

Running as daemon using Ubuntu upstart

A good way to run the website on a Linux server is by creating a Linux container using lxc. After installing the server, you can enable it to start at boot time by copying upstart/swi-prolog.conf to `/etc/init` after editing it to suit your configuration requirements. By default, the server runs as user www-data, group www-data as specified in the above configuration file.

Make sure the following components are writeable to the server process. For files, this means mode 664, group www-data. For directories, this means mode 2775, group www-data.

log Write httpd.log and pack-warnings.log
pack Mirrors known packages. Will be populated as the server is started.

www: subdirectories and .txt files Needs to make the wiki pages editable. It is also wise to do this in a git branch. From the www directory, do:

% git checkout master
% git pull
% git checkout -b wiki
% find . -type d | xargs chmod 2775
% find . -name '*.txt' | xargs chmod 664
% chgrp -W www-data .

*.db

Issues with the locally running site

There is no download section (but that can't be a big issue)
If you want to use the login facility to play with the interactive aspects of the site, you need to
1. Get a reCAPTCHA key-pair from Google
2. Run (from a started server)
```
?- set_setting(recaptcha:public_key, 'public key goes here').
?- set_setting(recaptcha:private_key, 'private key goes here').
?- save_settings.
```
3. Run the server from a port that is accessible from the public internet.
4. Use an OpenID provider that is not too picky for your site. In our experience, Google is less picky than Yahoo.

Prolog files

annotation.pl -- Annotation
annotation/3	Show annotations for Object.
api.pl
autocomplete.pl -- SWI-Prolog website autocompletion support
blog.pl
changelog.pl
customise.pl
daemon.pl
did_you_know.pl -- Interesting snippets about SWI-Prolog
download.pl
examples.pl
ex_xref/3
index_examples/0	Update the example index.
reindex_examples/0	Update the example index.
fastly.pl -- Purge pages on our CDN
footer.pl -- Footer
forum.pl
generics.pl -- Generics
git_html.pl
gitweb.pl -- Provide gitweb support
holidays.pl
http_cgi.pl -- Run CGI scripts from the SWI-Prolog web-server
load.pl
make.pl
markdown.pl -- Parse markdown documents into a DOM
markdown_dom/2	Process markdown input into an HTML DOM structure compatible to load_structure/3 and html//1 as provided by library(http/html_write).
markitup.pl -- Wrapper for markItUp ajax markup editor
messages.pl -- Run goals that produce messages
news.pl -- News on the SWI-Prolog Web site
notify.pl -- Send notications by E-mail
object_support.pl -- Object support
openid.pl -- Handle users of the SWI-Prolog website
create_user/1	Create a new user for the given Google Profile.
login_existing_user/1	True if the user is know to us and thus we can perform the login without further interaction.
authenticate/3	Get authentication for editing wiki pages.
current_user/2
grant/2	Grant/revoke User (a UUID) the right to access Token.
login_link/3	Create a link to login, which returns to the current page.
redirect_master/1	Redirect a request to the master server, so we do not have to deal with multiple versions of the database files.
revoke/2	Grant/revoke User (a UUID) the right to access Token.
site_user/2	Demand the user to be logged on and, if this is the first logon, verify the user and create a profile.
site_user_logged_in/1	True when User is logged on.
user_profile_link/3	Create a link to the profile of a user.
xrds_specified_location/2	Hacks to deal with broken Yadis support.
pack.pl
pack_analyzer.pl -- Analyse the content of a Prolog pack
pack_info.pl -- Visual (web) components that show info about packs
pack_mirror.pl -- Mirror pack archives
page.pl
parms.pl
server/2	Describe known servers and their role.
server/3	Describe known servers and their role.
plweb.pl -- Server for PlDoc wiki pages and SWI-Prolog website
post.pl -- Posts
add_post_link/4	Emit HTML that allows for adding a new post.
all/1	News filter, returning all objects.
find_posts/3	True when Ids is a list of all posts of Kind for which `call(CheckId, Id)` is true.
fresh/1	True if post Id is considered fresh.
post/3	True if Post have Value for the given attribute.
post/4	Generate HTML for apost.
post_process/2	HTTP handler that implements a REST interface for postings.
posts/6	Generate HTML for a list of posts and add a link to add new posts.
relevance/2	If `Importance` is higher, then the dropoff of `Relevance` is flatter.
user_post_count/3	True when Count is the number of posts of Kind created by User.
user_posts/4	Show posts from a specific user of the specified Kind.
user_vote_count/3	Number of votes issued by this user.
proxy.pl
rating.pl -- Provide a star-rating widget
register.pl
review.pl -- Handle rating and reviewing of packages
stats.pl -- Server statistics components
http_server_pool_table/2	Display table with statistics on thread-pools.
http_server_statistics/2	HTML component showing statistics on the HTTP server.
http_session_table/2	HTML component that writes a table of currently logged on users.
tagit.pl
ac_object/3	Provide additional autocompletion matches on tags,.
tagit_footer/4	Show tagit widget for adding and deleting tags.
user_tags/4	Show all tags created by a given user.
test_recaptcha.pl
tests.pl
update.pl
watchdog.pl
wiki.pl
extract_title/3	Extract the title from a wiki page.
file/4	Trap translation of \`file(+Path, Options)`.
include/5
index_wiki_pages/0	Create a (title) index of the available wiki pages.
safe_file_name/1	True when Name is a file without references to parent directories.
title_text/2	Turn the title, represented as an argument to html//1 into a plain string.
update_wiki_page_title/1	Update the cached information about a wiki file.
wiki_file_to_dom/2	DOM is the HTML dom representation for the content of File.
wiki_page_title/2	True when Title is the title of the wiki page at Location.
wiki_edit.pl -- Edit PlDoc wiki pages