**(live: // [ [[harlowe:Number|Number]] ]//) -> //[[harlowe:Changer|Changer]]//**

When you attach this macro to a hook, the hook becomes "live", which means that it's repeatedly re-run
every certain [[harlowe:number|number]] of milliseconds, replacing the source inside of the hook with a newly computed version.

=== Example usage: ===

<code>
{(live: 0.5s)[
    (either: "Bang!", "Kaboom!", "Whammo!", "Pow!")
]}
</code>
=== Rationale: ===

Twine passage text generally behaves like a HTML document: it starts as code, is changed into a
rendered page when you "open" it, and remains so until you leave. But, you may want a part of the
page to change itself before the player's eyes, for its code to be re-renders "live"
in front of the player, while the remainder of the passage remains the same.

Certain macros, such as the [[harlowe:link|(link:)]] macro, allow a hook to be withheld until after an element is
interacted with. The (live:) macro is more versatile: it re-renders a hook every specified number of
milliseconds. If [[harlowe:if|(if:)]] or [[harlowe:unless|(unless:)]] macros are inside the hook, they of course will be re-evaluated each time.
By using these two kinds of macros, you can make a (live:) macro repeatedly check if an event has occurred, and
only change its text at that point.

=== Details: ===

Live hooks will continue to re-render themselves until they encounter and print a [[harlowe:stop|(stop:)]] macro. [[harlowe:stop|(stop:)]] should be used whenever you don't need to keep the hook "live", to save on processing and passage repainting (which can interfere with clicking, selecting text, and other interactions).

If you want to just display a hook once a certain thing happens (that is, when the condition in an [[harlowe:if|(if:)]] macro becomes true) and then [[harlowe:stop|(stop:)]], then the [[harlowe:event|(event:)]] macro may be shorter and easier to use for this.

Currently, you **cannot** attach (live:) to a [[harlowe:command|command]] (such as in ''%%(live:2s)(link-goto:"?")%%''). You have to wrap the command in a hook (such as ''%%(live:2s)[(link-goto:"?")]%%'').

=== See also: ===

[[harlowe:event|(event:)]]