Update README

Author: jwagner

README.md

@@ -26,25 +26,22 @@ npm install --save smartcrop-sharp sharp
 ## Example
 
 ```javascript
-var request = require('request');
-var sharp = require('sharp');
-var smartcrop = require('smartcrop-sharp');
+const sharp = require('sharp');
+const smartcrop = require('smartcrop-sharp');
 
+// finds the best crop of src and writes the cropped and resized image to dest.
 function applySmartCrop(src, dest, width, height) {
-  request(src, { encoding: null }, function process(error, response, body) {
-    if (error) return console.error(error);
-    smartcrop.crop(body, { width: width, height: height }).then(function(result) {
-      var crop = result.topCrop;
-      sharp(body)
+  return smartcrop.crop(src, { width: width, height: height })
+    .then(function(result) {
+      const crop = result.topCrop;
+      return sharp(src)
         .extract({ width: crop.width, height: crop.height, left: crop.x, top: crop.y })
         .resize(width, height)
         .toFile(dest);
-    });
-  });
+    })
 }
 
-var src = 'https://raw.githubusercontent.com/jwagner/smartcrop-gm/master/test/flower.jpg';
-applySmartCrop(src, 'flower-square.jpg', 128, 128);
+applySmartCrop('flower.jpg', 'flower-square.jpg', 128, 128);
 ```
 
 ## Face Detection Example

test/test.js

@@ -1,22 +1,61 @@
-var path = require('path');
-var assert = require('chai').assert;
+const fs = require('fs');
+const path = require('path');
+const assert = require('chai').assert;
 
-var smartcrop = require('../index.js');
+const smartcrop = require('../index.js');
+const https = require('https');
 
-var imageSrc = path.resolve(__dirname, 'flower.jpg');
+const imageSrc = path.resolve(__dirname, 'flower.jpg');
+const imageSrcHttp = 'https://raw.githubusercontent.com/jwagner/smartcrop-gm/master/test/flower.jpg';
 
 describe('smartcrop', function() {
   describe('crop', function() {
+    function validateCrop(data) {
+      assert(data.topCrop, 0);
+      assert.equal(data.topCrop.x, 0);
+      assert.equal(data.topCrop.y, 26);
+      assert.equal(data.topCrop.width, 427);
+      assert.equal(data.topCrop.height, 427);
+    }
     it('returns a valid crop', function() {
       return smartcrop
         .crop(imageSrc, { width: 128, height: 128, minScale: 1 })
-        .then(function(data) {
-          assert(data.topCrop, 0);
-          assert.equal(data.topCrop.x, 0);
-          assert.equal(data.topCrop.y, 26);
-          assert.equal(data.topCrop.width, 427);
-          assert.equal(data.topCrop.height, 427);
+        .then(validateCrop);
+    });
+    it('accepts a stream', function() {
+      function httpsGetBuffer(src) {
+        return new Promise((resolve,reject) => {
+          const chunks = [];
+          https.get(src, (response) => {
+            response.on('data', chunk => chunks.push(chunk));
+            response.on('end', () => resolve(Buffer.concat(chunks)));
+            response.on('error', reject);
+          });
+        });
+      }
+      return httpsGetBuffer(imageSrcHttp).then(responseBodyBuffer =>
+        smartcrop
+          .crop(responseBodyBuffer, { width: 128, height: 128, minScale: 1 })
+      ).then(validateCrop);
+    });
+  });
+  describe('readme example', function() {
+    it('writes a file', function() {
+      var sharp = require('sharp');
+
+      function applySmartCrop(src, dest, width, height) {
+        return smartcrop.crop(src, { width: width, height: height }).then(function(result) {
+          var crop = result.topCrop;
+          return sharp(src)
+            .extract({ width: crop.width, height: crop.height, left: crop.x, top: crop.y })
+            .resize(width, height)
+            .toFile(dest);
+        }).then(() => {
+          fs.unlinkSync(dest);
         });
+      }
+
+      return applySmartCrop(imageSrc, 'flower-square.jpg', 128, 128);
     });
   });
 });