Promisify and reorganize import function

version bump

Author: brendannee

README.md

@@ -31,10 +31,12 @@ Install node-gtfs directly from [npm](https://npmjs.org):
     const gtfs = require('gtfs');
     const config = require('./config.json');
 
-    gtfs.import(config, (err) => {
-      if (err) return console.error(err);
-
-      console.log('Import Successful')
+    gtfs.import(config)
+    .then(() => {
+      console.log('Import Successful');
+    })
+    .catch(err => {
+      console.error(err);
     });
 
 ## Configuration
@@ -222,10 +224,12 @@ Use `gtfs.import()` in your code to run an import of a GTFS file specified in a
     mongoose.Promise = global.Promise;
     mongoose.connect(config.mongoUrl);
 
-    gtfs.import(config, (err) => {
-      if (err) return console.error(err);
-
-      console.log('Import Successful')
+    gtfs.import(config)
+    .then(() => {
+      console.log('Import Successful');
+    })
+    .catch(err => {
+      console.error(err);
     });
 
 Configuration can be a JSON object in your code
@@ -248,10 +252,12 @@ Configuration can be a JSON object in your code
     mongoose.Promise = global.Promise;
     mongoose.connect(config.mongoUrl);
 
-    gtfs.import(config, (err) => {
-      if (err) return console.error(err);
-
-      console.log('Import Successful')
+    gtfs.import(config)
+    .then(() => {
+      console.log('Import Successful');
+    })
+    .catch(err => {
+      console.error(err);
     });
 
 ## Query Methods

bin/gtfs-import.js

@@ -1,5 +1,8 @@
 #!/usr/bin/env node
+
 const path = require('path');
+
+const fs = require('fs-extra');
 const untildify = require('untildify');
 const argv = require('yargs')
     .usage('Usage: $0 --config ./config.json')
@@ -20,31 +23,25 @@ const argv = require('yargs')
 
 const gtfs = require('../');
 
-const configPath = path.resolve(untildify(argv.configPath));
-
 function handleError(err) {
   console.error(err || 'Unknown Error');
   process.exit(1);
 }
 
-function getConfig() {
-  try {
-    const config = require(configPath);
-
-    if (argv.skipDelete) {
-      config.skipDelete = argv.skipDelete;
-    }
-
-    return config;
-  } catch (err) {
-    handleError(new Error(`Cannot find configuration file at \`${configPath}\`. Use config-sample.json as a starting point, pass --configPath option`));
+fs.readFile(path.resolve(untildify(argv.configPath)), 'utf8')
+.then(data => JSON.parse(data))
+.then(config => {
+  if (argv.skipDelete) {
+    config.skipDelete = argv.skipDelete;
   }
-}
-
-gtfs.import(getConfig(), err => {
-  if (err) {
-    handleError(err);
-  }
-
+  return config;
+})
+.catch(err => {
+  console.error(new Error(`Cannot find configuration file at \`${argv.configPath}\`. Use config-sample.json as a starting point, pass --configPath option`));
+  handleError(err);
+})
+.then(gtfs.import)
+.then(() => {
   process.exit();
-});
+})
+.catch(handleError);