PmWiki.InterMap History
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The InterMap (also called InterWiki in some other wikis) is a system for defining links between [[WikiWikiWeb]] sites that was first developed by UseMod and Meatball (see UseMod:InterWiki and Meatball:InterWiki). The method is to use a word shortcut that stands for a defined path. InterMap links have the form [@MapPrefix:PagePath@], where the host prefix is converted to a partial URL based on entries in the site's ''intermap.txt'' and ''localmap.txt'' files.
[[#custominclude]]
!! The default intermap.txt
The default ''intermap.txt'' distributed with PmWiki (in the ''scripts/'' directory) includes the following InterMap entries:
>>pre<<
PmWiki: http://www.pmwiki.org/wiki/PmWiki/
Cookbook: http://www.pmwiki.org/wiki/Cookbook/
Wiki: http://www.c2.com/cgi/wiki?
UseMod: http://www.usemod.com/cgi-bin/wiki.pl?
Meatball: http://www.usemod.com/cgi-bin/mb.pl?
Wikipedia: http://en.wikipedia.org/wiki/
PITS: http://www.pmwiki.org/wiki/PITS/
PmL10n: http://www.pmwiki.org/wiki/Localization/
Path:
>><<
!! The page [[{$SiteGroup}.InterMap]]
(:if exists {$SiteGroup}.InterMap:)
[[{$SiteGroup}.InterMap]] includes the following entries:
(:include {$SiteGroup}.InterMap#include#includeend:)
(:else:)
You can map your own prefixes in your local page [[{$SiteGroup}.InterMap]].
(:ifend:)
[[#customincludeend]]
Thus, "PmWiki:Variables" becomes "http://www.pmwiki.org/wiki/PmWiki/" + "Variables," a link to the [[PmWiki.Variables->http://www.pmwiki.org/wiki/PmWiki/Variables]] page on the official PmWiki web site, Wiki:FrontPage is a link to the front page of the first WikiWikiWeb, and Wikipedia:Stonehenge takes you to the Wikipedia article about the famous megaliths in England.
!! Usage in a wiki page
Like other links, you can use the double-bracket syntax to get different link text:
(:markup class=horiz:)
* [[Meatball:StartingPoints | starting points]] over at Meatball
* [[starting points -> Meatball:StartingPoints]] over at Meatball
(:markupend:)
If you want to link just to what the intermap says (e.g. http://www.wikipedia.com/wiki/ for Wikipedia), then do [@[[Wikipedia:. | Wikipedia's main page]]@], which produces [[Wikipedia:. | Wikipedia's main page]]. Note the . (period) after the Map: reference.
[[#path]]
The special [@Path:@] InterMap entry can be used to create "[[Cookbook:RelativeUrls|relative urls]]" in [[Cookbook:RelativeLinks|links]].
!! Custom InterMap prefixes
The actual set of InterMap links at any site is defined by the site administrator via the [[Site.InterMap]] page and the ''local/localmap.txt'' file.
An intermap entry takes the following format:
-> [@
MapPrefix: http://example.com/partial/url/
@]
The InterMap entry can be for any of the [[(PmWiki:)link schemes]] supported by PmWiki.
[[<<]]
You can create your own InterMap links by doing one or more of the following:
* Modify the page called ''[[{$SiteGroup}.InterMap]]'' and place entries like the ones above in it.
* Create a file called ''local/localmap.txt'' and place entries like the ones above in it.
* In a [[WikiFarm(s)]] installation you can create a file called
''local/farmmap.txt'' and there place entries like the ones above in it.
These prefixes will be common to all the wikis in the farm.
* Ensure that there is a space after the colon.
Do not edit the file ''scripts/intermap.txt'' directly! If you do, you'll
lose your changes when you [[PmWiki/upgrade(s)]] PmWiki.
!! Variables and InterMap links
It's possible to use variables within your InterMap entries. The following
entries create [@ThisWiki:@] and [@ThisPage:@] shortcuts:
-> [@
ThisWiki: $ScriptUrl
ThisPage: {$PageUrl}
@]
You can also define InterMap entries where the text of the entry is
substituted into the middle of the URL. Just include '$1' in the URL where
you want the substitution to take place. For example:
->[@Jargon: http://catb.org/~esr/jargon/html/$1.html@]
would cause [@Jargon:F/feature-creep@] to be converted to [@http://catb.org/~esr/jargon/html/F/feature-creep.html@].
!! Tips and tricks
It is possible to document your intermap prefixes directly in the page
[[Site.InterMap]]. The extra text will not cause a performance penalty, nor
will it break the definition of prefixes. However, be aware that anything
matching a line starting with a word and a colon (''':''') will be
considered to define a prefix.
The order in which various sources are checked for definitions of prefixes
is controlled by the variable $InterMapFiles. Currently the precedence
(highest to lowest is as follows):
* ''local/localmap.txt''
* ''$SiteGroup.InterMap''
* ''$FarmD/local/farmmap.txt''
* ''$FarmD/scripts/intermap.txt''
>>faq<< [[#faq]]
Q: Are InterMap names case sensitive?
A: Yes, thus [@eAdmin:@] is a different InterMap link than [@EAdmin:@].
Q: How can I achieve a ''localmap.txt'' mapping with the effect of [@Pics: Path:/somepathto/pics/@]?
A: Use the following:
->[@Pics: /somepathto/pics/@]
Q: How can I define an InterMap in PHP?
A: Use the following:
->[@
$LinkFunctions['PmWikiHome:'] = 'LinkIMap';
$IMap['PmWikiHome:'] = 'http://pmwiki.org/wiki/$1';
@]
to:
This isinght's just the way to kick life into this debate.
