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35 lines
1.7 KiB
Plaintext
35 lines
1.7 KiB
Plaintext
created: 20140410103123179
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modified: 20150220161001000
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tags: [[Filter Operators]] [[Common Operators]] [[Negatable Operators]]
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title: is Operator
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type: text/vnd.tiddlywiki
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caption: is
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op-purpose: filter the input by fundamental category
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op-input: a [[selection of titles|Title Selection]]
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op-parameter: a category
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op-parameter-name: C
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op-output: those input tiddlers that belong to category <<.place C>>
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op-neg-output: those input tiddlers that do <<.em not>> belong to category <<.place C>>
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The parameter <<.place C>> is one of the following fundamental categories:
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|!Category |!Matches any tiddler that... |
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|^`current` |is the [[current tiddler|Current Tiddler]] |
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|^`image` |has an image ContentType |
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|^`missing` |does not exist (other than possibly as a shadow tiddler), regardless of whether there are any links it |
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|^`orphan` |has no [[hard links|Hard and Soft Links]] to it |
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|^`shadow` |is a [[shadow tiddler|ShadowTiddlers]], regardless of whether it has been overridden with a non-shadow tiddler |
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|^`system` |is a [[system tiddler|SystemTiddlers]], i.e. its title starts with `$:/` |
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|^`tag` |is in use as a tag |
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|^`tiddler` |exists as a non-shadow tiddler |
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If <<.place C>> is anything else, the output is an error message.
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`!is[tiddler]` is a synonym for `is[missing]`, and vice versa.
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When <<.op is[missing]>> is the first operator in a [[run|Filter Run]], its output is always empty. And when <<.op is[shadow]>> comes first, it outputs only those shadow tiddlers that have been overridden. This is because the [[initial input to a run|Filter Expression]] contains only <<.em non>>-shadow tiddlers.
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The <<.olink all>> operator is similar, but its scope is the whole wiki.
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<<.operator-examples "is">>
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