Update to Hexo 3.0

Update to make code more similar to existing hexojs plugins.

In theory should work with previous versions of hexojs, but forcing version to 3.0.

lib/deployer.js

@@ -0,0 +1,55 @@
+var chalk = require('chalk');
+var s3sync = require('s3-sync');
+var readdirp = require('readdirp');
+
+module.exports = function(args) {
+  var publicDir = this.config.public_dir;
+  var log = this.log;
+
+  if (!args.hasOwnProperty('concurrency')) {
+    args.concurrency = 8;
+  }
+
+  if (!args.hasOwnProperty('aws_key')) {
+    args.aws_key = process.env.AWS_KEY
+  }
+
+  if (!args.hasOwnProperty('aws_secret')) {
+    args.aws_secret = process.env.AWS_SECRET;
+  }
+
+  if (!args.bucket || !args.aws_key || !args.aws_secret) {
+    var help = '';
+
+    help += 'You should configure deployment settings in _config.yml first!\n\n';
+    help += 'Example:\n';
+    help += '  deploy:\n';
+    help += '    type: s3\n';
+    help += '    bucket: <bucket>\n';
+    help += '    [aws_key]: <aws_key>        # Optional, if provided as environment variable\n';
+    help += '    [aws_secret]: <aws_secret>  # Optional, if provided as environment variable\n';
+    help += '    [concurrency]: <concurrency>\n';
+    help += '    [region]: <region>          # See https://github.com/LearnBoost/knox#region\n\n',
+    help += 'For more help, you can check the docs: ' + chalk.underline('https://github.com/nt3rp/hexo-deployer-s3');
+
+    console.log(help);
+    return;
+  }
+
+  // s3sync takes the same options arguments as `knox`,
+  // plus some additional options listed above
+  return readdirp({root: publicDir, entryType: 'both'})
+      .pipe(s3sync({
+        key: args.aws_key,
+        secret: args.aws_secret,
+        bucket: args.bucket,
+        concurrency: args.concurrency,
+        region: args.region
+      }).on('data', function(file) {
+        log.info(file.fullPath + ' -> ' + file.url)
+      }).on('end', function() {
+        log.info('Done!');
+      }).on('fail', function(err) {
+        log.error(err)
+      }));
+};