str/src/vm/output.ts

import {StrRVal} from "./commands/command.js";
import {Awaitable} from "../util/types.js";
import childProcess from "node:child_process";
import fs from "node:fs";
import crypto from "node:crypto";

export const getSubjectDisplay = (sub: StrRVal): string => {
    if ( sub.term === 'string' ) {
        return sub.value
    }

    if ( sub.term === 'int' ) {
        return String(sub.term)
    }

    return JSON.stringify(sub.value, null, '\t')  // fixme
}

export type Display = {
    showSubject(sub: StrRVal): Awaitable<unknown>
}

export class ConsoleDisplay implements Display {
    showSubject(sub: StrRVal) {
        console.log(`\n---------------\n${getSubjectDisplay(sub)}\n---------------\n`)
    }
}

export class NullDisplay implements Display {
    showSubject() {}
}

export type Clipboard = {
    read(): Awaitable<string>
    overwrite(sub: string): Awaitable<unknown>
}

export class FakeClipboard {
    private val = ''

    read() {
        return this.val
    }

    overwrite(sub: string) {
        this.val = sub
    }
}

const tempFile = () => `/tmp/str-${crypto.randomBytes(4).readUInt32LE(0)}.txt`
export class WlClipboard {
    async read(): Promise<string> {
        const tmp = tempFile()
        fs.writeFileSync(tmp, '')
        const proc = childProcess.spawn('sh', ['-c', `wl-paste > "${tmp}"`])
        await new Promise<void>(res => {
            proc.on('close', () => res())
        })
        return fs.readFileSync(tmp).toString('utf-8')
    }

    async overwrite(sub: string): Promise<void> {
        const tmp = tempFile()
        fs.writeFileSync(tmp, sub)
        const proc = childProcess.spawn('sh', ['-c', `wl-copy < "${tmp}"`], { stdio: 'inherit' })
        await new Promise<void>(res => {
            proc.on('close', () => res())
        })
    }
}

export type OutputManager = {
    display: Display,
    clipboard: Clipboard,
}