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sprocket

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A library for building live views and real-time server components in Gleam

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sprocket src sprocket hooks effect.gleam
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src/sprocket/hooks/effect.gleam 

import gleam/option.{None}

import sprocket/context.{Context, Element}

import sprocket/hooks.{Effect, EffectCleanup, HookTrigger}

import sprocket/internal/utils/unique



pub fn effect(

  ctx: Context,

  effect_fn: fn() -> EffectCleanup,

  trigger: HookTrigger,

  cb: fn(Context) -> #(Context, List(Element)),

) -> #(Context, List(Element)) {

  // define the initial effect function that will only run on the first render

  let init = fn() { Effect(unique.new(), effect_fn, trigger, None) }



  // get the previous effect result, if one exists

  let #(ctx, Effect(id, _effect_fn, _trigger, prev), index) =

    context.fetch_or_init_hook(ctx, init)



  // update the effect hook, combining with the previous result

  let ctx =

    context.update_hook(ctx, Effect(id, effect_fn, trigger, prev), index)



  cb(ctx)

}