runtime-shell/commands/eval.js

Some useful shell commands for runtime.js

'use strict';

const shellUtil = require('../util');
const evalScope = require('../lib/eval-scope');

module.exports = (runtime) => {
  runtime.shell.setCommand('eval', (args, env, cb) => {
    const evalCode = (text) => {
      try {
        const result = evalScope(text);
        if (result !== undefined) {
          env.stdio.writeLine(result);
        } else {
          env.stdio.writeLine('');
        }
        return true;
      } catch(e) {
        env.stdio.writeError(e);
        env.stdio.write('\n');
        return false;
      }
    }

    const argv = shellUtil.parse(args);

    if (argv.length > 0) {
      console.log('hi');
      cb(evalCode(argv.join(' ')) ? 0 : 1);
    } else {
      let last_res;
      env.stdio.write('> ');
      const processText = (text) => {
        if (text == ".exit") return cb(last_res ? 0 : 1);
        last_res = evalCode(text);
        env.stdio.write('> ');
        env.stdio.readLine(processText);
      }
      env.stdio.readLine(processText);
    }
  });
};