readline-browser

This library is designed with same APIs as the node.js core module readline.

Which supports you start a repl in a browser environment.

Example

with xterm.js

const { Terminal } = require("xterm");
const rl = require("readline-browser");
const getStringWidth = require("string-width");


const term = new Terminal();
term.open(document.getElementById("terminal"));


function getMappedKeyName(rawName){
    if(rawName == "Backspace"){
        return "backspace";
    }else if(rawName == "ArrowLeft"){
        return 'left';
    }else if(rawName == "ArrowRight"){
        return 'right';
    }else if(rawName == "ArrowUp"){
        return 'up';
    }else if(rawName == "ArrowDown"){
        return 'down';
    }else if(rawName == "Delete"){
        return 'delete';
    }else if(rawName == "Enter"){
        return 'enter';
    }else if(rawName == "Tab"){
        return 'tab';
    }else if(rawName == "Home"){
        return 'home';
    }else if(rawName == "End"){
        return 'end';
    }else if(rawName == "Return"){
        return 'return';
    }
    return rawName;
}
const input = {
    on(event,listener){
        if(event == "data"){

        }else if(event == "keypress"){
            term.onData((char)=>{
                if(getStringWidth(char)>=2){
                    listener(char,{
                        sequence:char,
                        name:undefined,
                        ctrl:false,
                        meta:false,
                        shift:false,
                    })
                }
            });

            term.onKey(({key,domEvent})=>{

                const name = getMappedKeyName(domEvent.key);
                const ctrl = domEvent.ctrlKey;
                const shift = domEvent.shiftKey;

                listener(key,{
                    sequence:name,
                    name,
                    ctrl,
                    shift
                });
            });
        }        
    },
    resume(){
        console.log("resume");
    },
    pause(){
        console.log("pause");

    }
}

const output = {
    isTTY:true,
    get columns(){
        return term.cols;
    },
    on(event,listener){
        if(event == "resize"){
            term.onResize(listener);
        }
    },
    write(data){
        term.write(data);
    }
}

const intf = rl.createInterface(input,output);

async function startRepl(){
    while(true){
        console.log(await new Promise((resolve)=>intf.question("$ > ",resolve)));
    }
}

startRepl();

replace builtin module

//const rl = require("readline");
const rl = require("readline-browser");

//some other things