neovim-client/promise.js

Neovim client library

var attachWithCallback = require('./index');

module.exports = function attach(writer, reader) {
  return new Promise(function(resolve, reject) {
    attachWithCallback(writer, reader, function(err, nvim) {
      if (err) {
        reject(err);
      } else {
        //promisify APIs
        var interfaces = {
          Nvim: nvim.constructor,
          Buffer: nvim.Buffer,
          Window: nvim.Window,
          Tabpage: nvim.Tabpage,
        };

        Object.keys(interfaces).forEach(function(key) {
          Object.keys(interfaces[key].prototype).forEach(function(method) {
            const oldMethod = interfaces[key].prototype[method];
            const metadata = oldMethod.metadata || { parameters: [] }
            if(metadata.parameters[metadata.parameters.length-1] !== 'cb') {
              return
            }
            interfaces[key].prototype[method] = function() {
              const args = Array.prototype.slice.call(arguments);
              const context = this;
              return new Promise(function(resolve, reject) {
                args.push(function(err, result) {
                  if (err) {
                    reject(err);
                  } else {
                    resolve(result);
                  }
                });
                oldMethod.apply(context, args);
              });
            };
          })
        });

        resolve(nvim);
      }
    });
  });
}

// 'default' export for ES2015 or TypeScript environment.
module.exports.default = module.exports;