purpose | filter the input by fundamental category |
---|---|
input | a selection of titles |
parameter | C =a category |
output | those input tiddlers that belong to category C |
! output | those input tiddlers that do not belong to category C |
Learn more about how to use Filters
The parameter C
is one of the following fundamental categories:
Category | Matches any tiddler title that... |
---|---|
current | is the current tiddler |
image | has an image ContentType |
binary | has a binary ContentType |
missing | does not exist (other than possibly as a shadow tiddler), regardless of whether there are any links to it |
orphan | has no hard links to it |
shadow | is a shadow tiddler, regardless of whether it has been overridden with a non-shadow tiddler |
system | is a system tiddler, i.e. its title starts with $:/ |
tag | is in use as a tag |
tiddler | exists as a non-shadow tiddler |
variable | Introduced in v5.1.20 exists as a variable (whether or not that variable has a non-blank value) |
blank | Introduced in v5.1.20 is blank (i.e. is a zero length string) |
draft | Introduced in v5.1.23 is a draft of another tiddler. Synonym for [has[draft.of]] |
If C
is anything else an error message is returned. Introduced in v5.1.14 if C
is blank, the output is passed through unchanged (in earlier versions an error message was returned).
!is[tiddler]
is a synonym for is[missing]
, and vice versa.
When is[missing]
is the first operator in a run, its output is always empty. And when is[shadow]
comes first, it outputs only those shadow tiddlers that have been overridden. This is because the initial input to a run contains only non-shadow tiddlers.
The all
operator is similar to is
, but its scope is the whole wiki.