Headlines Plugin

Show headline news in TWiki pages based on RSS and ATOM news feeds from external sites

Description

This plugin displays RSS and ATOM feeds from news sites. Use it to build news portals that show headline news.

Note: Syndic8.com ( http://www.syndic8.com/ ) lists many RSS feeds.

Syntax Rules

%HEADLINES{"..."}%

Parameter Explanation Default
"..." source of RSS feed; this can be an url (starting with http) or a web.topic location for internal feeds None; is required
href="..." (Alternative to above) N/A
refresh="60" Refresh rate in minutes for caching feed; "0" for no caching Global REFRESH setting
limit="12" Maximum number of items shown Global LIMIT setting
touch="..." Touch (edit/save) topics if the feed has updates. Specify a comma-space delimited list of TopicNames or Web.TopicNames, such as "%TOPIC%, NewsLetter". Useful to send out newsletter using MailerContrib, showing new feeds since last newsletter. To update feeds, visit topics with feeds in regular intervals (using cron with wget or the like). N/A
header Header. Can include these variables: - $channeltitle, $title: title of channel (channel.title)
- $channellink, $link: link of channel (channel.link)
- $channeldescription, $description: description (channel.description)
- $channeldate, $date: publication date of the channel (channel.pubDate)
- $rights: copyrights of the channel (channel.copyright)
- $imagetitle: title text for site (image.title)
- $imagelink: link for site (image.link)
- $imageurl: URL of image (image.url)
- $imagedescription: description of image (image.description)
Global HEADER setting
format Format of one item. Can include these variables:
- $title: news item title (item.title)
- $link: news item link (item.link)
- $description: news item description (item.description)
- $date: the publication date (item.pubDate, item.date)
- $category: the article category (item.category)
Global FORMAT setting

The header and format parameters might also use variables rendering the dc, image and content namespace information. Note, that only bits of interest have been implemented so far and those namespaces might not be implemented fully yet.

Rendering the dc namespace

The following variables are extracting the dc namespace info, that could be used in header and format. Nnote, that some of the variables are already used above. This is done by purpose to use different feeds with the same formating parameters. If there's a conflict the non-dc tags have higher precedence, i.e. a <title> content </title> is prefered over <dc:title> content </dc:title> .

  • $title: channel/article title (dc:title)
  • $creator: channel creator (dc:creator)
  • $subject: subject text; this will also add an image according to the subject hash list, see above (dc:subject)
  • $description: ... (dc:description)
  • $publisher: the channel/article publisher (dc:publisher)
  • $contributor: ... (dc:contributor)
  • $date: ... (dc:date)
  • $type: ... (dc:type)
  • $format: ... (dc:format)
  • $identifier: ... (dc:identifier)
  • $source: ... (dc:source)
  • $language: ... (dc:language)
  • $relation: ... (dc:relation)
  • $coverage: ... (dc: coverage)
  • $rights: ... (dc: rights)

Rendering the image namespace

An image:item is converted into an <img> tag using the following mappings:

  • src: image url (rdf:about attribute of the image.item tag)
  • alt: image title (title)
  • width: image width (image:width)
  • height: image height image:height)

Rendering the content namespace

The variable $content is refering to the <content:encoding> content </content:encoding>.

Examples

Slashdot News

Write

%HEADLINES{ "http://slashdot.org/slashdot.rdf" 
  header="*[[$link][$title]]:* $description" 
  format="$t* [[$link][$title]]"
  limit="4"
}%
to get the latest Slashdot news as a bullet list format:

Business Opportunities Weblog

Write

%HEADLINES{ "http://www.business-opportunities.biz/feed" limit="2" }%

to get the latest postings on the "Business Opportunities" weblog:

Tue, 28 Feb 2017 01:16:51 +0000
The original blog about business opportunities and business ideas for small business entrepreneurs
Mon, 27 Feb 2017 23:33:33 +0000 Bizop Team

If you are looking for a franchise to invest in, there are a lot of different criteria to choose from. One of the ways you can compare franchises is by looking at which are currently growing the fastest.

RELATED: TOP NEW FRANCHISES TO INVEST IN 

Many of these franchises are quickly spreading across the country, and this is due to a lot of reasons, including their unique products, growing brand recognition and smart development plans. Similar to past years, the fastest growing franchise types this year were the following:

  1. Restaurant Concepts
  2. Fitness Centers
  3. Beauty Salons

For restaurants specifically, the fastest growing franchises in America typically include those that specialize in sandwiches, coffee and frozen yogurt. When looking for your next investment, don't forget to take a look at the fastest growing franchises. There's a reason why these companies are sweeping across the country.

To see our franchise listings CLICK HERE

RELATED: TOP 10 FRANCHISES OF 2015

Sat, 25 Feb 2017 22:19:14 +0000 Laurie B

The History of Bitcoin in Numbers

Developed by an unidentified programmer under the name Satoshi Nakamoto and introduced in 2009, Bitcoin was the first decentralized digital currency and has endured a tumultuous inception into the mainstream over the majority of the last decade. In this article, Wirex offer insight into the history of bitcoin. How has the infamous cryptocurrency progressed in terms of both value and abundance? And how is its price influenced by extraneous real-world factors?

In the beginning (2009-2010)

Bitcoin - a P2P electronic cash system - derives from an internet-published paper of the same name, which described a 'system for electronic transactions without relying on trust'. Subsequently, at the start of 2009, the Bitcoin network came into existence with Satoshi Nakamoto mining the first block (''genesis'' block), which delivered a reward of 50 Bitcoins. However, due to its infancy and obscurity, it had relatively no value against major currencies and had low trust levels for investment opportunities.

This all changed in 2010, though, when the first real-world transaction was made with one Bitcoin owner purchasing two pizzas from Papa John's in Florida for 10,000 BTC. Soon after this, in the early days of June 2010, the price of Bitcoin grew 1000% and rose from $0.008 to $0.08 for 1 Bitcoin. This substantial increase demonstrated future potential as such an exponential rise was monitored over the course of just 5 days.

Gaining traction (2011-2012)

After a difficult entrance into the mainstream and with a low valuation against the world's main currencies, the next few years were highly prosperous for Bitcoin seeing it's value skyrocket when compared to previous years. For starters, between Feb and April of 2011, Bitcoin took parity with the US dollar as the value for 1 Bitcoin grew to the equivalent of $1. Such valuation showed signs of real promise when it grew to a high of $31, as a number of high-profile organisations began to accept Bitcoin for donations. This high didn't last for long, though, as it slumped back to just $2 in December 2011.

The growth of Bitcoin over the past year inevitably ground to a halt, demonstrating both progress and instability as the value experienced a turbulent year of rises and falls. However, the rise in value showed investors that it had potential and it closed for the year at a value of $13.

Bitcoin's Volatile for the Mercantile (2013-2014)

Although Bitcoin had a low value as it entered 2013, in April of the same year Bitcoins value shot up to $266 as the summit of a price rally where its value was rising by 5-10% daily. However, the next few months saw the price slip to a low of $70 in June, but hankered around $110 in July. One of the main reasons for this is due to the increasing number of merchants deciding to accept Bitcoin under its payment processing service, though the instability of the market was enough to deter the masses.

Despite the uncertainty surrounding value, in the latter stages of the year the value of Bitcoin rose astronomically from a base of around $150 to over $1,000 per Bitcoin which was reported on 27 November 2013. The following month of December 2013 exhibited extreme volatility as the value crashed to $600, rose to $1,000, and crashed again to $500, before settling at a stable $650-$800. Owing to much media publicity throughout the year, the cryptocurrency had become too big to ignore for many as popularity soared into 2014.

One of the potential reasons as to why the price fluctuated so much over the course of this year is as a consequence of the banking crisis, which debilitated the economies of a host of countries. As such, with the world's top centralised currencies reduced in strength and value, Bitcoin prospered.

Bitcoin's fall from grace (2014-2015)

Although encountering a solid entry into 2014 with the value of Bitcoin peaked at $1000, before settling at around $850 by the end of January. February, however, signified Bitcoin's fall from grace and epitomised the fragility of the market when extraneous factors limited its progression and potential investment opportunities. In the months to come, Bitcoin's value continued to slide to its lowest point since the 2012-2013 Cypriot financial crisis to a low point of $340 per Bitcoin. Reasons for this may include the shutdown of Chinese Bitcoin exchange, Mt. Gox, over legal issues and growing uncertainty over the legitimacy of digital currencies from the Chinese government. Much stayed the same throughout 2015 as the price fell once more in the earlier stages of the year, but began to increase in value towards the back end of the year.

Bitcoin's resurgence (2016)

Bitcoin entered 2016 at around an unflattering $400 per Bitcoin, with the average price meandering between the $450-$750 mark. However, currencies in the Far East, such as the Japanese Yuen and Chinese Renmibi, depreciated significantly throughout the year which meant that more people were turning to Bitcoin to retain value in their native currency. Consequently, with such an influx of money pouring into the market, a surge in strength and value of Bitcoin rapidly increased over a short space of time from the latter stages of December and into early January of 2017. This increase saw Bitcoin's value shoot up to a high of around $1,150 - the highest notable price in Bitcoin history - before dropping by almost 35% just a week later.

While Bitcoin is slowly recovering from the recent fall following its exponential rise in December, China's Central Bank have launched an investigation into the fluctuations and have scheduled talks with three of the largest Bitcoin exchanges in China to gather additional information about the market. As it stands, though, the world must await China's Central Bank to unearth their findings before any further rise can be expected from Bitcoin.

Plugin Settings

Plugin settings are stored as preferences variables. To reference a plugin setting write %<plugin>_<setting>%, for example, %HEADLINESPLUGIN_SHORTDESCRIPTION%. Note: Don't modify the settings here; copy and customize the settings in Main.TWikiPreferences. For example, to customize the USERAGENTNAME setting, create a HEADLINESPLUGIN_USERAGENTNAME setting in Main.TWikiPreferences.

  • One line description, shown in the TextFormattingRules topic:
    • Set SHORTDESCRIPTION = Show headline news in TWiki pages based on RSS and ATOM news feeds from external sites

  • Refresh rate in minutes for cached feeds. Disable caching: 0, default: 60
    • Set REFRESH = 60

  • Maximum number of items shown. Default: 100
    • Set LIMIT = 100

  • Use LWP::UserAgent, or fallback to TWiki's internal getUrl() method. Default: yes
    • Set USELWPUSERAGENT = yes

  • Timeout fetching a feed using the LWP::UserAgent. Default: 20
    • Set USERAGENTTIMEOUT = 20

  • Name of user agent. Default: TWikiHeadlinesPlugin/2.21
      * Set USERAGENTNAME = TWikiHeadlinesPlugin/2.21

  • Default header: (variables are explained in the syntax rules)
      * Set HEADER = <div class="headlinesChannel"><div class="headlinesLogo"><img src="$imageurl" alt="$imagetitle" border="0" />%BR%</div><div class="headlinesTitle">$n---+!! <a href="$link">$title</a></div><div class="headlinesDate">$date</div><div class="headlinesDescription">$description</div><div class="headlinesRight">$rights</div></div>

  • Default format of one item: (variables are explained in the syntax rules)
      * Set FORMAT = <div class="headlinesArticle"><div class="headlinesTitle"><a href="$link">$title</a></div>$n<span class="headlinesDate">$date</span> <span class="headlinesCreator"> $creator</span> <span class="headlinesSubject"> $subject </span>$n<div class="headlinesText"> $description</div></div>

  • Values taken from configure: (only supported if CPAN:LWP is installed)
    • $TWiki::cfg{PROXY}{HOST} - proxy host, such as "proxy.example.com";
    • $TWiki::cfg{PROXY}{PORT} - proxy port, such as "8080";
    • $TWiki::cfg{PROXY}{SkipProxyForDomains} - domains excluded from proxy, such as "intra.example.com, bugs.example.com";

Style Sheets

The default HEADER and FORMAT settings use the following styles. See the style.css file defining the default CSS properties (indentation illustrates enclosure).

  • headlinesRss: output of the HeadlinesPlugin (div)
    • headlinesChannel: channel header (div)
      • headlinesLogo: channel logo (div)
      • headlinesTitle: channel title (div)
      • headlinesDate: channel date (div)
      • headlinesDescription: channel description (div)
      • headlinesRight: channel copyright (div)
    • headlinesArticle: one news item (div)
      • headlinesTitle: article title (div)
      • headlinesDate: article date (span)
      • headlinesCreator: author of article (span)
      • headlinesSubject: subect category of the article (span)
      • headlinesText: article text (div)

Plugin Installation Instructions

  • Download the ZIP file.
  • Unzip it in your twiki installation directory. Content:
    File: Description:
    data/TWiki/HeadlinesPlugin.txt plugin topic
    pub/TWiki/HeadlinesPlugin/style.css default css
    lib/TWiki/HeadlinesPlugin.pm plugin perl module
    lib/TWiki/HeadlinesPlugin/Core.pm plugin core
    Check if above examples show a news feed instead of variable.
  • Optionally, run HeadlinesPlugin_installer.pl to automatically check and install other TWiki modules that this module depends on. You can also do this step manually.
  • Alternatively, manually make sure the dependencies listed in the table below are resolved.
    NameVersionDescription
    Digest::MD5>=2.33Required. Download from CPAN:Digest::MD5
    LWP::UserAgent>=5.803Optional. Download from CPAN:LWP::UserAgent

Plugin Info

Plugin Author: TWiki:Main.PeterThoeny, TWiki:Main.MichaelDaum
Copyright: © 2002-2010, Peter Thoeny, Twiki, Inc.; 2005-2007, Michael Daum http://wikiring.de
License: GPL (GNU General Public License)
Plugin Version: v2.6 - 2010-05-16
Change History:  
2010-05-16: TWikibug:Item6433 - more doc improvements
2010-04-25: TWikibug:Item6433 - doc fix: Changing TWIKIWEB to SYSTEMWEB
2010-02-27: TWikibug:Item6313 - fixed bug in ATOM feed with <link ...></link> instead of <link ... /> -- Peter Thoeny
2009-09-30: fixed bug in lastBuildDate of feeds affecting touch parameter functionality -- Peter Thoeny
2009-08-29: added touch parameter -- Peter Thoeny
12 Feb 2009: {PROXY}{HOST} supports domain with and without protocol -- Peter Thoeny
06 Feb 2009: added {PROXY}{SkipProxyForDomains} configure setting, added USERAGENTNAME plugin setting -- Peter Thoeny
11 Dec 2008: added {PROXY}{HOST} and {PROXY}{PORT} configure settings -- Peter Thoeny
13 Sep 2007: fixed parsing of content:encoded
23 Jul 2006: improved atom parser; if a posting has no title default to 'Untitled'
26 Apr 2006: added lazy compilation
10 Feb 2006: packaged using the TWiki:Plugins/BuildContrib; minor fixes
03 Feb 2006: off-by-one: limit="n" returned n+1 articles; make FORMAT and HEADER format strings more robust
23 Jan 2006: released v2.00
05 Dec 2005: internal feed urls must be absolute
02 Dec 2005: added web.topic shorthand for internal feeds
29 Nov 2005: fixed CDATA handling
21 Nov 2005: added ATOM support; extended RSS support; added dublin core support; added content support; optionally using LWP to fetch feeds to follow redirections; corrected CPAN dependencies ; recoding special chars from html integer to entity encoding to increase browser compatibility; added css support; use getWorkArea() if available
11 May 2005: TWiki:Main.WillNorris: added DevelopBranch compatability
31 Oct 2004: Fixed taint issue by TWiki:Main.AdrianWeiler; small performance improvement
29 Oct 2004: Fixed issue of external caching if mod_perl or SpeedyCGI is used
02 Aug 2002: Implemented caching of feeds, thanks to TWiki:Main/RobDuarte
11 Jun 2002: Initial version (V1.000)
Perl Version: 5.8
TWiki:Plugins/Benchmark: GoodStyle 100%, FormattedSearch 99.5%, HeadlinesPlugin 94%
Plugin Home: http://TWiki.org/cgi-bin/view/Plugins/HeadlinesPlugin
Feedback: http://TWiki.org/cgi-bin/view/Plugins/HeadlinesPluginDev
Appraisal: http://TWiki.org/cgi-bin/view/Plugins/HeadlinesPluginAppraisal

Related Topics: TWikiPlugins, AdminDocumentationCategory, TWikiPreferences

Topic revision: r1 - 2010-05-17 - TWikiContributor
 
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