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Sort Filter Run Prefix

22nd May 2021 at 4:26pm

New in: 5.2.0

purposesort the input titles by the result of evaluating this filter run for each item
inputall titles from previous filter runs
suffixthe :sort filter run prefix uses a rich suffix, see below for details
outputthe sorted result of previous filter runs

Each input title from previous runs is passed to this run in turn. The filter run transforms the input titles into the form needed for sorting. For example, the filter run [length[]] transforms each input title in to the number representing its length, and thus sorts the input titles according to their length.

Note that within the filter run, the "currentTiddler" variable is set to the title of the tiddler being processed. This permits filter runs like :sort:number[{!!value}divide{!!cost}] to be used for computation. The value of currentTiddler outside the run is available in the variable "..currentTiddler".

The :sort filter run prefix uses an extended syntax that allows for multiple suffixes, some of which are required:

:sort:<type>:<flaglist>[...filter run...]
  • type: Required. Determines how the items are compared and can be any of: string, alphanumeric, number, integer, version or date.
  • flaglist: comma separated list of the following flags:
    • casesensitive or caseinsensitive (required for types string and alphanumeric).
    • reverse to invert the order of the filter run (optional).

Note that filter runs used with the :sort prefix should return the same number of items that they are passed. Any missing entries will be treated as zero or the empty string. In particular, when retrieving the value of a field with the get Operator it is helpful to guard against a missing field value using the else Operator. For example [get[myfield]else[default-value]....