Shell-Code/main.js at main · the-specs-coder/Shell-Code · GitHub

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const readline = require("readline");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt:"$ "
});

// Uncomment this block to pass the first stage


rl.prompt()
rl.on('line',(input)=>{
    input=input.trim();
    execCmd(input)
    rl.prompt()
})

let CMDS=["echo","exit","type"]
let usr_bin=["ls"]
let _bin=["cat","cp","mkdir"]
let _usr_local_bin=["valid_command"]
let _tmp_foo=["my_exe"]

function execCmd(command){
    const{cmd,args}=getCmd(command)

    if(cmd==="echo")
    {
        console.log(args.join(" "))
    }
    else if(cmd==="exit")
    {
        process.exit(0)
    }
    else if(cmd==="type")
    {
        printType(args[0])
    }
    else{
        console.log(`${cmd}: command not found`)
    }
}


function getCmd(command)
{
    args=command.split(/\s+/)
    cmd=args[0]
    args.shift()

    return {cmd,args}
}

function printType(cmdName)
{
    let found=false;
    if(CMDS.includes(cmdName))
    {
        console.log(`${cmdName} is a shell builtin`)
        found=true
    }

    else if(usr_bin.includes(cmdName))
    {
        console.log(`${cmdName} is /usr/bin/${cmdName}`)
        found=true
    }

    else if(_usr_local_bin.includes(cmdName))
    {
          console.log(`${cmdName} is /usr/bin/${cmdName}`)
          found=true
    }

    else if(_bin.includes(cmdName))
    {
      console.log(`${cmdName} is /bin/${cmdName}`)
      found=true
    }

    else if(_tmp_foo.includes(cmdName))
    {
      console.log(`${cmdName} is tmp/foo/${cmdName}`)
      found=true
    }


    if(!found)
    {
        console.log(`${cmdName}: not found`)
    }
}