LOE
League of Extraordinary FoundryVTT Developersccjmk

Saving Functions as module settings

@wasp I remember you asked about saving functions as settings (which quickly turned into stringifying them IIRC?), did you end up doing something about that ? I am sort of in dire need of the same haaha EDIT I'll thread this to keep the convo focused
C
ccjmk•786d ago
In particular, I need to save the Commands for Commander, that have several inner functions (looking for an example)
W
Wasp•786d ago
I did not, no - but if you were to stringify the function and then eval(settingString)() you can at least call it
C
ccjmk•786d ago
is it just plain 
const myFunction = () => {...}
const funcStr = JSON.stringify(myFunction)
// save funcStr ?
const myFunction = () => {...}
const funcStr = JSON.stringify(myFunction)
// save funcStr ?
??? I recalled we had to do some processing to it like rehydrating the function using a new Function(..) and stuff
W
Wasp•786d ago
Yeah, eval and new Function I believe will both work
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ccjmk•786d ago
for ref, this is what I want to save (objects with this shape) 
{
    name: "tae",
    description: "Token Active Effect",
    schema: "tae $effect",
    args: [{
      name: 'effect',
      type: 'string',
      suggestions: (...) => {...}, // function
    }],
    allow: (...) => {...}  // function
    handler: (...) => {...}  // function
}
{
    name: "tae",
    description: "Token Active Effect",
    schema: "tae $effect",
    args: [{
      name: 'effect',
      type: 'string',
      suggestions: (...) => {...}, // function
    }],
    allow: (...) => {...}  // function
    handler: (...) => {...}  // function
}
hmm ok, I will play a little bit and report back probably later today 😆 thanks!
LTL
Leo The League Lion•786d ago
@ccjmk gave vote LeaguePoints™ to @wasp (#6 • 386)
K
kaelad•786d ago
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ccjmk•786d ago
I landed here https://stackoverflow.com/a/40876342 looks like the same approach, will give this a try later today! 🙂 this pesky thing called work got in the middle 😆
Stack Overflow
JavaScript - Save object with methods as a string
I've been looking around for a way to do this but can't seem to find anything, I have different configuration objects that I need to save as a text in variables for some processing later on, here i...
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ccjmk•785d ago
In case you were still looking into it Wasp, this is what I did: 
export function persistCommandInLocalStorage(command: Command) {
  const serializedCommand = JSON.stringify(command, replacer, 2);
  const key = `cmd-${getCommandSchemaWithoutArguments(command)}`;

  const storedCommands = new Map(JSON.parse(localStorage.getItem(LS_KEY) ?? '[]'));
  storedCommands.set(key, serializedCommand);
  localStorage.setItem(LS_KEY, JSON.stringify([...storedCommands]));
}

export function retrieveCommandsFromModuleSetting(): Command[] {
  const storedCommands = new Map(JSON.parse(localStorage.getItem(LS_KEY) ?? '[]'));
  return Array.from(storedCommands.values())
    .map(serializedCommand => JSON.parse(serializedCommand as string, reviver));
}

const replacer = (key: string, value: unknown) => {
  return typeof value === 'function' ? value.toString() : value;
};

const reviver = (key: string, value: string) => {
  return ['handler', 'allow', 'suggestions'].includes(key) ? new Function(`(${value})`) : value;
};
export function persistCommandInLocalStorage(command: Command) {
  const serializedCommand = JSON.stringify(command, replacer, 2);
  const key = `cmd-${getCommandSchemaWithoutArguments(command)}`;

  const storedCommands = new Map(JSON.parse(localStorage.getItem(LS_KEY) ?? '[]'));
  storedCommands.set(key, serializedCommand);
  localStorage.setItem(LS_KEY, JSON.stringify([...storedCommands]));
}

export function retrieveCommandsFromModuleSetting(): Command[] {
  const storedCommands = new Map(JSON.parse(localStorage.getItem(LS_KEY) ?? '[]'));
  return Array.from(storedCommands.values())
    .map(serializedCommand => JSON.parse(serializedCommand as string, reviver));
}

const replacer = (key: string, value: unknown) => {
  return typeof value === 'function' ? value.toString() : value;
};

const reviver = (key: string, value: string) => {
  return ['handler', 'allow', 'suggestions'].includes(key) ? new Function(`(${value})`) : value;
};
Oh it's not really working as expected yet 😦
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