View source for Template:Diff/doc

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{{High-use}}
{{Twinkle standard installation}}

This template is intended to be useful for creating links to "[[Help:Diff|diffs]]"; that is, links to pages that show the differences between two versions of a wiki page.

Every version of a page has a revision ID, which you can find from the [[Help:Page history|history]] of the page by looking at the timestamp link for the edit. The timestamp link is in this form:<br />
<code>http[s]://en.wikipedia.org/w/index.php?title=SomePageName&oldid=442212827</code><br />
The number after <code>oldid=</code> is the revision ID.

Given one or two revision IDs, you can construct links to several types of diffs.

== Usage ==
:{{tji|Diff|title|diff|oldid|label|diffonly: yes}}
* <code>''title''</code>{{snds}}The title of the page (optional in most cases)
* <code>''diff''</code>{{snds}}The ID or keyword that is used against the base ID. Possible keywords are:
*: <code>cur</code>{{snds}}Compare with the current version of a page.
*: <code>prev</code>{{snds}}Compare with the previous version of a page.
*: <code>next</code>{{snds}}Compare with the next version of a page.
*: ''id''{{snds}}This should be ''larger'' than <code>oldid</code>.
* <code>''oldid''</code>{{snds}}The base ID onto which the diff is generated.
* <code>''label''</code>{{snds}}Text to display as link (optional){{nsmdns}}no label will generate a numbered link as the label.
* {{para|diffonly|yes}}{{snds}}Displays the page comparisons only (optional){{nsmdns}}parameter name required if used.

Only the ''diff'' parameter is required; all other parameters are optional. Omitted parameters must be empty (by using a double pipe). You can also use the named parameters <code>'''title'''</code>, <code>'''diff'''</code>, <code>'''oldid'''</code>, and <code>'''label'''</code>.

== Helper subtemplate ==

In order to make this template simpler to use the helper subtemplate {{tl|Diff/translator}} is available, '''to be used only in the preview window'''.

;Syntax:
:{{tji|Diff/translator|label|url: diff URL}}

For instance, imagine you want to refer to the following diff URL: <code><nowiki>https://en.wikipedia.org/w/index.php?title=Main_Page&diff=139993&oldid=139992&diffonly=1</nowiki></code>; you only need to transcribe that URL in the {{tl|Diff/translator}} subtemplate and produce a preview, '''without saving the page''':

: {{tji|Diff/translator|Sic exorsi sumus|url: <nowiki>https://en.wikipedia.org/w/index.php?title=Main_Page&diff=139993&oldid=139992&diffonly=1</nowiki>}}
:: ↳ <code>{{Diff/translator|Sic exorsi sumus|url=https://en.wikipedia.org/w/index.php?title=Main_Page&diff=139993&oldid=139992&diffonly=1}}</code>

Now copy the code generated (<code>{{Diff/translator|Sic exorsi sumus|url=https://en.wikipedia.org/w/index.php?title=Main_Page&diff=139993&oldid=139992&diffonly=1}}</code>) into the edit window where {{tl|Diff/translator}} was and publish the page.

==Examples==
Below each example in the left-hand column is the pseudocode for that example in ''<code>{{font color|brown|brown italics}}</code>'' and indented. Elements that should be entered literally are in '''''<code>{{font color|brown|{{uu|brown bold underlined italics}}}}</code>'''''. When a parameter is left blank, the resulting two adjacent pipes are underlined (but not bolded): ''<code>{{font color|brown|<u>&#x7c;&#x7c;</u>}}</code>''.

{| class="wikitable"
|-
! style="width:33%;" | Code !! Output
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page''<nowiki>|</nowiki>'''<u>prev</u>'''<nowiki>|</nowiki>''204901573''<nowiki>|</nowiki>''Diff between a numbered version and the previous version''<nowiki>}}</nowiki></code>
::''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki>'''<u>prev</u>'''<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|prev|204901573|Diff between a numbered version and the previous version}}
'''This is the form that would be used most often.'''
* The '''diff=''' parameter (parameter number 2) should be the word '''prev'''.
* The '''oldid=''' parameter (parameter number 3) should be the known revision number.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Foobar''<nowiki>|</nowiki>''616706711''<nowiki>|</nowiki>''616706707''<nowiki>|</nowiki>''Diff between two numbered versions of a page''<nowiki>}}</nowiki></code>
::''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page title<nowiki>|</nowiki>diff<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|616706711|616706707|Diff between two numbered versions of a page}}
* The '''title=''' parameter (parameter number 1) should be a name of a page, for instance [[:Foobar]].
* The '''diff=''' parameter (parameter number 2) should be the larger revision number.
* The '''oldid=''' parameter (parameter number 3) should be the smaller revision number.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>||</nowiki>''616706711''<nowiki>|</nowiki>''616706707''<nowiki>|</nowiki>''Diff between two numbered versions of a page without title parameter''<nowiki>}}</nowiki></code>
::''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>||</nowiki>diff<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff||616706711|616706707|Diff between two numbered versions of a page without title parameter}}
* The '''title=''' parameter (parameter number 1) may be left blank, thereby leaving a double pipe.
* The '''diff=''' parameter (parameter number 2) should be the larger revision number.
* The '''oldid=''' parameter (parameter number 3) should be the smaller revision number.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Wikipedia:Pagediff''<nowiki>|</nowiki>''204934693''<nowiki>|</nowiki>''204901573''<nowiki>|</nowiki>''Diff between two numbered versions of a <!-- Pagediff --> page in Wikipedia namespace''<nowiki>}}</nowiki></code>
::''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki>diff<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Wikipedia:Pagediff|204934693|204901573|Diff between two numbered versions of a <!-- Pagediff --> page in Wikipedia namespace}}
* The '''title=''' parameter (parameter number 1) should be a name of a page, for instance [[:Wikipedia:Pagediff]].
* The '''diff=''' parameter (parameter number 2) should be the page revision to appear on the right (proposed change).
* The '''oldid=''' parameter (parameter number 3) should be the page revision to appear on the left (original).
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page''<nowiki>|</nowiki>'''<u>next</u>'''<nowiki>|</nowiki>''204901573''<nowiki>|</nowiki>''Diff between a numbered version and the subsequent version''<nowiki>}}</nowiki></code>
:: ''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki>'''<u>next</u>'''<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|next|204901573|Diff between a numbered version and the subsequent version}}
* The '''diff=''' parameter (parameter number 2) should be the word '''next'''.
* The '''oldid=''' parameter (parameter number 3) should be the known revision number.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page''<nowiki>|</nowiki>'''<u>cur</u>'''<nowiki>|</nowiki>''204901573''<nowiki>|</nowiki>''Diff between a numbered version and the current version of a page''<nowiki>}}</nowiki></code>
:: ''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki>'''<u>cur</u>'''<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|cur|204901573|Diff between a numbered version and the current version of a page}}
* The '''diff=''' parameter (parameter number 2) should be the word '''cur'''.
* The '''oldid=''' parameter (parameter number 3) should be the known revision number.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page''<nowiki>|</nowiki>'''<u>cur<nowiki>||</nowiki></u>'''''Diff showing the most recent change to a page''<nowiki>}}</nowiki></code>
:: ''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki><u>'''cur'''<nowiki>||</nowiki></u>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|cur||Diff showing the most recent change to a page}}
* The '''diff=''' parameter (parameter number 2) should be the word '''cur'''.
* The '''oldid=''' parameter (parameter number 3) should be empty.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page'''''<u><nowiki>||</nowiki></u>'''''204901573''<nowiki>|</nowiki>''A link to a numbered version of a page''<nowiki>}}</nowiki></code>
:: ''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page{{uu|<nowiki>||</nowiki>}}oldid<nowiki>|</nowiki>label<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page||204901573|A link to a numbered version of a page}}
* The '''diff=''' parameter (parameter number 2) should be empty.
* The '''oldid=''' parameter (parameter number 3) should be the known revision number.
* The result is not actually a diff, so this might be considered misuse of the template. See the {{tl|oldid}} template.
|-
| <code><nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>''Main Page''<nowiki>|</nowiki>''204901573''<nowiki>|</nowiki>''202506579''<nowiki>|</nowiki>''Comparison display without page display of two numbered versions of a page'' <nowiki>|</nowiki>'''<u>diffonly=yes</u>'''<nowiki>}}</nowiki></code>
: ''<code>{{font color|brown|<nowiki>{{</nowiki>'''{{uu|Diff}}'''<nowiki>|</nowiki>page<nowiki>|</nowiki>diff<nowiki>|</nowiki>oldid<nowiki>|</nowiki>label<nowiki>|</nowiki>'''<u>diffonly{{=}}yes</u>'''<nowiki>}}</nowiki>}}</code>''
| {{Diff|Main Page|204901573|202506579|Comparison display without page display of two numbered versions of a page |diffonly=yes}}
* The '''title=''' parameter (parameter number 1) should be a name of a page, for instance [[:Main Page]].
* The '''diff=''' parameter (parameter number 2) should be the larger revision number.
* The '''oldid=''' parameter (parameter number 3) should be the smaller revision number.
* The '''diffonly=''' parameter, which must include the parameter name, can only be set to <code>yes</code>
|}

== TemplateData ==
{{TemplateData header}}
<templatedata>
{
	"params": {
		"title": {
			"required": false,
			"label": "title",
			"type": "string/wiki-page-name",
			"description": "The title of the page.",
			"aliases": [
				"page",
				"1"
			]
		},
		"diff": {
			"required": true,
			"label": "Diff",
			"type": "string/line",
			"description": "The ID or keyword that is used against the base ID. Possible keywords are:\n* cur – compare with the current version of a page.\n* prev – compare with the previous version of a page.\n* next – compare with the next version of a page.\n* <var>id</var> – compare against this revision ID; should be <em>larger</em> than <code>oldid</code>.",
			"aliases": [
				"2"
			]
		},
		"oldid": {
			"required": false,
			"label": "Oldid",
			"type": "number",
			"description": "The base ID onto which the diff is generated. Some number like \"442212827\" (without the quotes).",
			"aliases": [
				"3"
			]
		},
		"diffonly": {
			"required": false,
			"label": "Diffonly",
			"type": "string/line",
			"description": "Displays the page comparisons only. If you use this, the value should be \"yes\" (without the quotes)."
		},
		"label": {
			"required": false,
			"label": "Label",
			"type": "string/line",
			"description": "Text to display as link. No label will give a numbered link.",
			"aliases": [
				"4"
			]
		}
	},
	"description": "A template that is intended to be useful for creating links to diffs; that is, links to pages that show the differences between two versions of a wiki page.",
	"paramOrder": [
		"title",
		"diff",
		"oldid",
		"label",
		"diffonly"
	]
}
</templatedata>

== See also ==
* {{Tl|Oldid}}&nbsp;– simplifies the case for linking to a known old version
* {{Tl|Diff2}}&nbsp;– same as {{Tlf|Diff}}, but assumes a diff between the given revision and the one immediately before
* {{Tl|Diff3}}&nbsp;– same as {{Tlf|Diff2}}, but does not support section links
* {{Tl|Diff4}}
* {{Tl|URL to diff}} – takes a diff URL and makes a {{Tlf|Diff}} template
* {{Tl|Diffsandbox}}&nbsp;– compares a given page with the sandbox version
* {{Tl|DiffPages}}&nbsp;– accepts two pagenames (no id's needed)
* {{Tl|Querylink}}&nbsp;– generic template to construct [[query string]]s
* [[diff utility]]&nbsp;– syntax highlight on wiki pages with [[mw:Extension:SyntaxHighlight GeSHi]]
* [[Special:Diff]] serves a similar purpose; see [[Help:Wiki markup#Linking to old revisions of pages, diffs, and specific history pages]].
* {{t|TextDiff}}
* {{tl|Url to title}}

<includeonly>{{Sandbox other||
<!-- Categories go here and interwikis go in Wikidata. -->
[[Category:Diff templates]]
[[Category:Special page templates]]

}}</includeonly>