Added cURL formatter

spec/Formatter/CurlCommandFormatterSpec.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace spec\Http\Message\Formatter;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+use PhpSpec\ObjectBehavior;
+
+class CurlCommandFormatterSpec extends ObjectBehavior
+{
+    function it_is_initializable()
+    {
+        $this->shouldHaveType('Http\Message\Formatter\CurlCommandFormatter');
+    }
+
+    function it_is_a_formatter()
+    {
+        $this->shouldImplement('Http\Message\Formatter');
+    }
+
+    function it_formats_the_request(RequestInterface $request, UriInterface $uri, StreamInterface $body)
+    {
+        $request->getUri()->willReturn($uri);
+        $request->getBody()->willReturn($body);
+
+        $uri->__toString()->willReturn('http://foo.com/bar');
+        $request->getMethod()->willReturn('GET');
+        $request->getProtocolVersion()->willReturn('1.1');
+
+        $request->getHeaders()->willReturn(['foo'=>['bar', 'baz']]);
+        $request->getHeaderLine('foo')->willReturn('bar, baz');
+
+        $this->formatRequest($request)->shouldReturn('curl \'http://foo.com/bar\' --request GET -H \'foo: bar, baz\'');
+    }
+
+    function it_formats_post_request(RequestInterface $request, UriInterface $uri, StreamInterface $body)
+    {
+        $request->getUri()->willReturn($uri);
+        $request->getBody()->willReturn($body);
+
+        $body->__toString()->willReturn('body data');
+
+        $uri->__toString()->willReturn('http://foo.com/bar');
+        $request->getMethod()->willReturn('POST');
+        $request->getProtocolVersion()->willReturn('2.0');
+
+        $request->getHeaders()->willReturn([]);
+
+        $this->formatRequest($request)->shouldReturn('curl \'http://foo.com/bar\' --http2 --request POST --data \'body data\'');
+    }
+
+    function it_does_nothing_for_response(ResponseInterface $response)
+    {
+        $this->formatResponse($response)->shouldReturn('');
+    }
+}

src/Formatter/CurlCommandFormatter.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Http\Message\Formatter;
+
+use Http\Message\Formatter;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * A formatter that prints a cURL command for HTTP requests.
+ *
+ * @author Tobias Nyholm <[email protected]>
+ */
+class CurlCommandFormatter implements Formatter
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function formatRequest(RequestInterface $request)
+    {
+        $command = sprintf('curl \'%s\'', $request->getUri());
+        if ($request->getProtocolVersion() === '1.0') {
+            $command .= ' --http1.0';
+        } elseif ($request->getProtocolVersion() === '2.0') {
+            $command .= ' --http2';
+        }
+
+        $command .= ' --request '.$request->getMethod();
+
+        foreach ($request->getHeaders() as $name => $values) {
+            $command .= sprintf(' -H \'%s: %s\'', $name, $request->getHeaderLine($name));
+        }
+
+        $body = $request->getBody()->__toString();
+        if (!empty($body)) {
+            $command .= sprintf(' --data \'%s\'', $body);
+        }
+
+        return $command;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function formatResponse(ResponseInterface $response)
+    {
+        return '';
+    }
+}