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| Operators | |
|---|---|
| and | True if both sides are true |
| or | True if one or other side is true |
| not | negate the following expression |
| =, != | String comparison |
| <, >, <=, >= | Number comparison (there is no explicit numeric =) |
| context | True if the current context is set (see below) |
| defined | True if a preference variable or url parameter of this name is defined. |
| $ | expands a URL parameter or TWikiVariable. Plugin handlers are not called. Built-in variables and user-defined preferences are supported. You can pass a limited subset of parameters to TWiki variables by enclosing the variable name in single quotes; for example, $ 'VARIABLE{value}'. The 'VARIABLE{value}' string may not contain quotes (' or "). |
TWiki variable defined or not
%IF{"defined WIKINAME" then="WIKINAME is defined" else="WIKINAME is not defined"}%
You are %IF{ "$ WIKINAME='TWikiGuest' and not defined OPEN_DAY" then="not" }% allowed to
%IF{ "context view" then="view" else="edit"}% this TWiki today.
URL parameter
%IF{ "defined search" then="Search: %URLPARAM{search}%" else="No search passed in"}%
Configuration item set or not
%IF{ "{AntiSpam}{HideUserDetails}" then="User details are hidden" }%
url param t is %IF{ "0 < $ t and $ t < 1000" then="in" else="out of"}% range.
Text comparison
%IF{ "$'URLPARAM{scope}'='text'" then="Plain text search" }%
Configuration items are defined in configure. You cannot see the value of a configuration item, you can only see if the item is set or not.
Context identifiers are used in TWiki to label various stages of the rendering process. They are especially useful for skin authors to find out where they are in the rendering process. The following context identifiers are available:
| id | context |
|---|---|
| absolute_urls | Set if absolute URLs are required |
| authenticated | a user is authenticated |
| body_text | when the body text is being processed in a view (useful in plugin handlers) |
| can_login | current environment supports login |
| changes | in changes script (see TWikiScripts) |
| command_line | the running script was run from the command line, and not from CGI |
| diff | in rdiff script (see TWikiScripts) |
| edit | in edit script (see TWikiScripts) |
| footer_text | when the footer text is being processed in a view (useful in plugin handlers) |
| header_text | when the header text is being processed in a view (useful in plugin handlers) |
| i18n_enabled | when user interface I18N? support is enabled (i.e., user can choose the language for UI) |
| inactive | if active links such as 'edit' and 'attach' should be disabled |
| mirror | if this is a mirror |
| new_topic | if the topic doesn't already exist |
| oops | in oops script (see TWikiScripts) |
| preview | in preview script (see TWikiScripts) |
| rss | if this is an RSS skin rendering |
| save | in save script (see TWikiScripts) |
| search | in search script (see TWikiScripts) |
| view | in view script (see TWikiScripts) |
| rest | in rest script (see TWikiScripts) |
GallousBreeksPlugin is installed and enabled, then the context ID GallousBreeksPluginEnabled will be set. Other extensions may set additional context identifiers.
The %IF% statement is deliberately kept simple. In particular, note that there is no way to conditionally execute a Set statement. If you need more sophisticated control over formatting, then consider using the SpreadSheetPlugin. 
