Editing Help/Links (section)

===Pipe trick=== <!--T:180-->

<!--T:181-->
If the part after the <tvar name=2><code>|</code></tvar> in a piped link is left empty, it is  to an abbreviated form of the page name on the left, based on the following rules:
</translate>

#<translate><!--T:182--> Any word that is before the '''first colon (:)''', as well as the colon character itself, is removed.</translate> <translate><!--T:183--> This word may or may not be a 'namespace' prefix (such as "Help:") or an 'interwiki' prefix (such as "commons:").</translate> <translate><!--T:184--> If the name of the page is preceded by a colon (:), "first" refers to "first after this".</translate>
#<translate><!--T:185--> If there is some text in the '''parentheses''' at the end, then it will be removed.</translate>
#<translate><!--T:186--> If there are no parentheses, but there is a '''comma''' (,) character, the comma and everything after it is removed.</translate>
#<translate><!--T:187--> Note that this does not work for '''sections/anchors''' as <tvar name="1"><code><nowiki>[[Help:Piped_link#Pipe_trick|]]</nowiki></code></tvar> outputs <tvar name="2">[[Help:Piped_link#Pipe_trick|]].</tvar></translate>

<translate>
<!--T:188-->
Similar to using the three or four tildes when signing on Talk pages, and using 'subst', in a preview, the result shows up in the preview itself, but the conversion in the edit box is not shown yet. Click on the <tvar name=1><code></code></tvar> option to see the change in the wikitext.

=====Examples===== <!--T:189-->
</translate>
* <translate><!--T:190--> <tvar name=1><code><nowiki>[[Help:Template|]]</nowiki></code></tvar> is converted to <tvar name=2><nowiki>[[Help:Template|Template]]</nowiki></tvar>, which is shown as <tvar name=3>[[Help:Template|Template]]</tvar></translate>
* <translate><!--T:191--> <tvar name="1"><code><nowiki>[[Music: My life|]]</nowiki></code></tvar> is converted to <tvar name="2"><nowiki>[[Music: My life| My life]]</nowiki></tvar>, which is shown as <tvar name="3">[[Music: My life| My life]]</tvar> - although "Music:" itself is not a namespace (therefore the space after the colon character is not automatically removed), however, the shortcut works anyway</translate>
* <translate><!--T:192--> <tvar name="1"><code><nowiki>[[w:en:Pipe (computing)|]]</nowiki></code></tvar> is converted to <tvar name="2"><nowiki>[[w:en:Pipe (computing)|en:Pipe]]</nowiki></tvar>, which is shown as <tvar name="3">[[w:en:Pipe (computing)|en:Pipe]]</tvar>.</translate>
* <translate><!--T:193--> <tvar name="1"><code><nowiki>[[commons:Boston, Massachusetts|]]</nowiki></code></tvar> is converted to <tvar name="2"><nowiki>[[commons:Boston, Massachusetts|Boston]]</nowiki></tvar>, which is shown as <tvar name="3">[[commons:Boston, Massachusetts|Boston]]</tvar>.</translate>
*<translate><!--T:194--> <tvar name="1"><code><nowiki>[[w:}|]]</nowiki></code></tvar> ''does not'' give <tvar name="2"><nowiki>[[w:}|}]]</nowiki></tvar>, and calling the template with a value of parameter 1 gives a working link, but in the case of substitution only.</translate>
*<translate><!--T:195--> <tvar name="1"><code><nowiki>[[w:en:|]]</nowiki></code></tvar> ''does not'' give <tvar name="2"><nowiki>[[w:en:|en:]]</nowiki></tvar> and <tvar name="3"><code><nowiki>[[m:|]]</nowiki></code></tvar> ''does not'' give <tvar name="4"><nowiki>[[m:|]]</nowiki></tvar></translate>
*<translate><!--T:196--> <tvar name="1"><code>[[Wikipedia:Village pump (technical)#Pipe trick|]]</code></tvar> is not converted, so it does not give a working link.</translate>
{|
| <translate><!--T:197--> This wikitext</translate>
| <translate><!--T:198--> Produces</translate>
|-
|
<syntaxhighlight lang="wikitext">
* [[project:a (b)|a]]
* [[w:project:a (b)|project:a]]
* [[:de:project:a (b)|project:a]]
* [[wiktionary:project:a (b)|project:a]]
* [[wiktionary:de:project:a (b)|de:project:a]]
* [[wikibooks:project:a (b)|project:a]]
* [[wikiquote:project:a (b)|project:a]]
* [[wikisource:project:a (b)|project:a]]
* [[wikisource:project:a (b)#c|]]
* [[w:en:|en:]] [[w:en:|en:]]
* [[m:|m:]] [[m:|m:]]
</syntaxhighlight>
|
 * [[project:a (b)|a]]
 * [[w:project:a (b)|project:a]]
 * [[:de:project:a (b)|project:a]]
 * [[wiktionary:project:a (b)|project:a]]
 * [[wiktionary:de:project:a (b)|de:project:a]]
 * [[wikibooks:project:a (b)|project:a]]
 * [[wikiquote:project:a (b)|project:a]]
 * [[wikisource:project:a (b)|project:a]]
 * [[wikisource:project:a (b)#c|]]
 * [[w:en:|en:]] [[w:en:|en:]]
 * [[m:|m:]] [[m:|m:]]
|}

<translate>
=====Category tag===== <!--T:199-->

<!--T:200-->
Since the sortkey syntax of the category is similar to a piped link, the pipe trick also works for category tags, even though technically, it is not useful there.

====Limitation==== <!--T:201-->
</translate>
* <translate><!--T:202--> <tvar name="1"><nowiki>[[Help:Lk|]]</nowiki></tvar> using <tvar name="2">[[template:tc]]</tvar> is not converted, so the result is rendered as <tvar name="3">[[Help:Lk|Lk]]</tvar> which is not as a working link.</translate> <translate><!--T:203--> This is because like substitution, the pipe trick expansion occurs before ordinary expansion of the templates, etc.</translate> <translate><!--T:204--> The pipe trick does not work if the linked page includes invalid characters.</translate> <translate><!--T:205--> Therefore, while ordinarily the acceptability of the target page name is assessed after template expansion, the pipe trick expansion judges it before that.</translate> <translate><!--T:206--> The braces are therefore considered invalid characters in the page name.</translate> <translate><!--T:207--> Instead, a template can be used like <tvar name="1">[[template:pipe trick]]</tvar>: <tvar name="2"><nowiki>k}}</nowiki></tvar> which renders as <tvar name="3">k}}</tvar>.</translate>

<translate>
====Inverse pipe trick==== <!--T:208-->

<!--T:209-->
On page "<tvar name="1">A (c)</tvar>", <tvar name="2"><nowiki>[[|b]]</nowiki></tvar> is converted to <tvar name="3"><nowiki>[[b (c)|b]]</nowiki></tvar> automatically.

<!--T:210-->
Similarly, on page "<tvar name="1">A, c</tvar>", <tvar name="2"><nowiki>[[|b]]</nowiki></tvar> is converted to <tvar name="3"><nowiki>[[b, c|b]]</nowiki></tvar> automatically.