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https://github.com/Jermolene/TiddlyWiki5
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43 lines
2.0 KiB
Plaintext
43 lines
2.0 KiB
Plaintext
caption: lookup
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created: 20170907103639431
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modified: 20210116081305739
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op-input: a [[selection of titles|Title Selection]]
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op-output: the lookup values corresponding to each lookup tiddler
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op-parameter: prefix applied to input titles to yield title of lookup tiddler from which value is retrieved. Now accepts 1 or 2 parameters, see below for details
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op-parameter-name: P, T
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op-purpose: applies a prefix to each input title to yield the title of a tiddler from which the final value is retrieved. With a single parameter, the default field is "text" and the default index is "0". If a second parameter is provided, that becomes the target field or index.
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op-suffix: the default value to be used for missing lookups. This operator can now accept a second suffix of `:index`, see below for details
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op-suffix-name: D, I
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tags: [[Filter Operators]]
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title: lookup Operator
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type: text/vnd.tiddlywiki
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<<.from-version "5.1.15">>
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The action of this operator is as follows with 1 parameter:
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* Apply the specified prefix to each input tiddler title, yielding a new list of tiddler titles
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* Transclude the value of the `text` field each of those tiddlers
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** Substitute the default value for missing or empty values
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* Return the list of values
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<<.from-version "5.2.2">>
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The use of the `:index` second suffix changes the default lookup location from field: `text` to index: `0`. This is used if no 2nd parameter is provided.
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The action of this operator is as follows with 2 parameters:
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If there are two parameters provided, use the second parameter as the target field or index.
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<<.note """If there is only one parameter given, the filter checks for a second suffix equal to "index". If this suffix is found, the default target index is "0".
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In all other cases, the default target field is "text".""">>
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Then:
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* Apply the specified prefix to each input tiddler title, yielding a new list of tiddler titles
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* Transclude the value of the target field or index
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** Substitute the default value for missing or empty values
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* Return the list of values
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<<.operator-examples "lookup">>
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