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import Astal from "gi://AstalIO"
import Binding, { type Connectable, type Subscribable } from "./binding.js"
import { interval } from "./time.js"
import { execAsync, subprocess } from "./process.js"
class VariableWrapper<T> extends Function {
private variable!: Astal.VariableBase
private errHandler? = console.error
private _value: T
private _poll?: Astal.Time
private _watch?: Astal.Process
private pollInterval = 1000
private pollExec?: string[] | string
private pollTransform?: (stdout: string, prev: T) => T
private pollFn?: (prev: T) => T | Promise<T>
private watchTransform?: (stdout: string, prev: T) => T
private watchExec?: string[] | string
constructor(init: T) {
super()
this._value = init
this.variable = new Astal.VariableBase()
this.variable.connect("dropped", () => {
this.stopWatch()
this.stopPoll()
})
this.variable.connect("error", (_, err) => this.errHandler?.(err))
return new Proxy(this, {
apply: (target, _, args) => target._call(args[0]),
})
}
private _call<R = T>(transform?: (value: T) => R): Binding<R> {
const b = Binding.bind(this)
return transform ? b.as(transform) : b as unknown as Binding<R>
}
toString() {
return String(`Variable<${this.get()}>`)
}
get(): T { return this._value }
set(value: T) {
if (value !== this._value) {
this._value = value
this.variable.emit("changed")
}
}
startPoll() {
if (this._poll)
return
if (this.pollFn) {
this._poll = interval(this.pollInterval, () => {
const v = this.pollFn!(this.get())
if (v instanceof Promise) {
v.then(v => this.set(v))
.catch(err => this.variable.emit("error", err))
} else {
this.set(v)
}
})
} else if (this.pollExec) {
this._poll = interval(this.pollInterval, () => {
execAsync(this.pollExec!)
.then(v => this.set(this.pollTransform!(v, this.get())))
.catch(err => this.variable.emit("error", err))
})
}
}
startWatch() {
if (this._watch)
return
this._watch = subprocess({
cmd: this.watchExec!,
out: out => this.set(this.watchTransform!(out, this.get())),
err: err => this.variable.emit("error", err),
})
}
stopPoll() {
this._poll?.cancel()
delete this._poll
}
stopWatch() {
this._watch?.kill()
delete this._watch
}
isPolling() { return !!this._poll }
isWatching() { return !!this._watch }
drop() {
this.variable.emit("dropped")
}
onDropped(callback: () => void) {
this.variable.connect("dropped", callback)
return this as unknown as Variable<T>
}
onError(callback: (err: string) => void) {
delete this.errHandler
this.variable.connect("error", (_, err) => callback(err))
return this as unknown as Variable<T>
}
subscribe(callback: (value: T) => void) {
const id = this.variable.connect("changed", () => {
callback(this.get())
})
return () => this.variable.disconnect(id)
}
poll(
interval: number,
exec: string | string[],
transform?: (stdout: string, prev: T) => T
): Variable<T>
poll(
interval: number,
callback: (prev: T) => T | Promise<T>
): Variable<T>
poll(
interval: number,
exec: string | string[] | ((prev: T) => T | Promise<T>),
transform: (stdout: string, prev: T) => T = out => out as T,
) {
this.stopPoll()
this.pollInterval = interval
this.pollTransform = transform
if (typeof exec === "function") {
this.pollFn = exec
delete this.pollExec
} else {
this.pollExec = exec
delete this.pollFn
}
this.startPoll()
return this as unknown as Variable<T>
}
watch(
exec: string | string[],
transform: (stdout: string, prev: T) => T = out => out as T,
) {
this.stopWatch()
this.watchExec = exec
this.watchTransform = transform
this.startWatch()
return this as unknown as Variable<T>
}
observe(
objs: Array<[obj: Connectable, signal: string]>,
callback: (...args: any[]) => T,
): Variable<T>
observe(
obj: Connectable,
signal: string,
callback: (...args: any[]) => T,
): Variable<T>
observe(
objs: Connectable | Array<[obj: Connectable, signal: string]>,
sigOrFn: string | ((obj: Connectable, ...args: any[]) => T),
callback?: (obj: Connectable, ...args: any[]) => T,
) {
const f = typeof sigOrFn === "function" ? sigOrFn : callback ?? (() => this.get())
const set = (obj: Connectable, ...args: any[]) => this.set(f(obj, ...args))
if (Array.isArray(objs)) {
for (const obj of objs) {
const [o, s] = obj
const id = o.connect(s, set)
this.onDropped(() => o.disconnect(id))
}
} else {
if (typeof sigOrFn === "string") {
const id = objs.connect(sigOrFn, set)
this.onDropped(() => objs.disconnect(id))
}
}
return this as unknown as Variable<T>
}
static derive<
const Deps extends Array<Subscribable<any>>,
Args extends {
[K in keyof Deps]: Deps[K] extends Subscribable<infer T> ? T : never
},
V = Args,
>(deps: Deps, fn: (...args: Args) => V = (...args) => args as unknown as V) {
const update = () => fn(...deps.map(d => d.get()) as Args)
const derived = new Variable(update())
const unsubs = deps.map(dep => dep.subscribe(() => derived.set(update())))
derived.onDropped(() => unsubs.map(unsub => unsub()))
return derived
}
}
export interface Variable<T> extends Omit<VariableWrapper<T>, "bind"> {
<R>(transform: (value: T) => R): Binding<R>
(): Binding<T>
}
export const Variable = new Proxy(VariableWrapper as any, {
apply: (_t, _a, args) => new VariableWrapper(args[0]),
}) as {
derive: typeof VariableWrapper["derive"]
<T>(init: T): Variable<T>
new<T>(init: T): Variable<T>
}
export const { derive } = Variable
export default Variable
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