content_state.ts

import Logger from "./logging"
const logger = new Logger("state")

export type ModeName =
    | "normal"
    | "insert"
    | "hint"
    | "ignore"
    | "gobble"
    | "input"
    | "find"

export class PrevInput {
    inputId: string
    tab: number
    jumppos?: number
}

class State {
    mode: ModeName = "normal"
    cmdHistory: string[] = []
    prevInputs: PrevInput[] = [
        {
            inputId: undefined,
            tab: undefined,
            jumppos: undefined,
        },
    ]
}

export type ContentStateProperty =
    | "mode"
    | "cmdHistory"
    | "prevInputs"

export type ContentStateChangedCallback =
    (property: ContentStateProperty, oldValue: any, newValue: any) => void

const onChangedListeners: ContentStateChangedCallback[] = []

export function addContentStateChangedListener(callback: ContentStateChangedCallback) {
    onChangedListeners.push(callback)
}

export const contentState = (new Proxy({"mode": "normal"}, {
    get: function(target, property: ContentStateProperty) {
        return target[property]
    },

    set: function(target, property: ContentStateProperty, newValue) {
        logger.debug("Content state changed!", property, newValue)

        const oldValue = target[property]
        target[property] = newValue

        for (let listener of onChangedListeners) {
            listener(property, oldValue, newValue)
        }
        return true
    },
}) as any) as State