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38 lines
1.7 KiB
Plaintext
38 lines
1.7 KiB
Plaintext
created: 20140410103123179
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modified: 20150124202225000
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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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purpose: filter the input by fundamental category
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<$macrocall $name=".operator-def"
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input="a [[selection of titles|Title Selection]]"
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parameter="a category -- see below"
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paramName="c"
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output="those input tiddlers that belong to category <<.place c>>"
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negationOutput="those input tiddlers that do <<.em not>> belong to category <<.place c>>"
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/>
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The parameter <<.place c>> is one of the following fundamental categories:
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|!Category |!Matches any tiddler that... |
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|^`current` |is the [[current tiddler|CurrentTiddler]] |
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|^`image` |has an image ContentType |
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|^`missing` |does not exist (other than possibly as a non-shadow tiddler), regardless of whether there are any links it |
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|^`orphan` |has no [[hard links|Hard and Soft Links]] to it |
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|^`shadow` |is a [[shadow tiddler|ShadowTiddlers]], regardless of whether it has been overridden with a non-shadow tiddler |
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|^`system` |is a [[system tiddler|SystemTiddlers]], i.e. its title starts with `$:/` |
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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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