infos = Information about the conditionals plugin is in keys below
infos/author = Thomas Waser thoma.nosp@m.s.wa.nosp@m.ser@l.nosp@m.ibel.nosp@m.ektra.nosp@m..org
infos/licence = BSD
infos/provides =
infos/needs =
infos/recommends =
infos/placements = presetstorage
infos/status = maintained unittest nodep libc preview
infos/metadata = check/condition assign/condition
infos/description =

This plugin uses if-then-else like conditions.

Check Syntax

Stored in the metakey check/condition to validate data is:

(IF-condition) ? (THEN-condition) : (ELSE-condition) where the ELSE-condition is optional

Condition: Key Operation `('String' | '1234.56' | Key | '')`

Operations: !=, ==, <, <=, =>, >, :=, where:

:= is used to set a key value
others are for comparison as in C

Assign Syntax

`(IF-condition) ? ('ThenValue') : ('ElseValue')`

Depending on if the condition is met, either 'ThenValue' or 'ElseValue' will be assigned as key value if the metakey assign/condition is used.

Example

`(this/key != 'value') ? (then/key == some/other/key) : (or/key <= '125')`

Meaning: IF this/key NOT EQUAL TO 'value' THEN then/key MUST EQUAL some/other/key ELSE or/key MUST BE LESS THAN 125

Another full example:

    kdb mount conditionals.dump /tmount/conditionals conditionals dump
    kdb set user/tmount/conditionals/fkey 3.0
    kdb set user/tmount/conditionals/hkey hello
    kdb setmeta user/tmount/conditionals/key check/condition "(hkey == 'hello') ? (fkey == '3.0')" # success
    kdb setmeta user/tmount/conditionals/key check/condition "(hkey == 'hello') ? (fkey == '5.0')" # fail

Assignment example:

    kdb mount conditionals.dump /tmount/conditionals conditionals dump
    kdb set user/tmount/conditionals/hkey Hello
    kdb setmeta user/tmount/conditionals/hkey assign/condition "(hkey == 'Hello') ? ('World')"
    kdb get user/tmount/conditionals/hkey # output: World