Add support for single-slash URI

In bug 323571 it is mentioned that if you call
'toURI().toURL().toString()' on a java.io.File you cannot pass
that string to jgit as an URIish. Problem is that the passed
URI looks like 'file:/C:/a/b.txt' and that we where expecting
double slashes after scheme':'. This fix adds support for this
single-slash file URLs.

Bug: 323571
Change-Id: I866a76a4fcd0c3b58e0d26a104fc4564e7ba5999
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/URIishTest.java

@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.transport;
 
+import java.io.File;
+import java.io.IOException;
 import java.net.URISyntaxException;
 
 import junit.framework.TestCase;
@@ -448,6 +450,41 @@ public class URIishTest extends TestCase {
 		assertEquals(u, new URIish(str));
 	}
 
+	public void testFileProtocol() throws IllegalArgumentException,
+			URISyntaxException, IOException {
+		// as defined by git docu
+		URIish u = new URIish("file:///a/b.txt");
+		assertEquals("file", u.getScheme());
+		assertFalse(u.isRemote());
+		assertNull(u.getHost());
+		assertNull(u.getPass());
+		assertEquals("/a/b.txt", u.getPath());
+		assertEquals(-1, u.getPort());
+		assertNull(u.getUser());
+		assertEquals("b.txt", u.getHumanishName());
+
+		File tmp = File.createTempFile("jgitUnitTest", ".tmp");
+		u = new URIish(tmp.toURI().toString());
+		assertEquals("file", u.getScheme());
+		assertFalse(u.isRemote());
+		assertNull(u.getHost());
+		assertNull(u.getPass());
+		assertTrue(u.getPath().contains("jgitUnitTest"));
+		assertEquals(-1, u.getPort());
+		assertNull(u.getUser());
+		assertTrue(u.getHumanishName().startsWith("jgitUnitTest"));
+
+		u = new URIish("file:/a/b.txt");
+		assertEquals("file", u.getScheme());
+		assertFalse(u.isRemote());
+		assertNull(u.getHost());
+		assertNull(u.getPass());
+		assertEquals("/a/b.txt", u.getPath());
+		assertEquals(-1, u.getPort());
+		assertNull(u.getUser());
+		assertEquals("b.txt", u.getHumanishName());
+	}
+
 	public void testMissingPort() throws URISyntaxException {
 		final String incorrectSshUrl = "ssh://some-host:/path/to/repository.git";
 		URIish u = new URIish(incorrectSshUrl);

org.eclipse.jgit/src/org/eclipse/jgit/transport/URIish.java

@@ -143,7 +143,17 @@ public class URIish implements Serializable {
 			+ "$");
 
 	/**
-	 * A pattern matching SCP URI's of the form user@host:path/to/repo.git
+	 * A pattern matching a URI for the scheme 'file' which has only ':/' as
+	 * separator between scheme and path. Standard file URIs have '://' as
+	 * separator, but java.io.File.toURI() constructs those URIs.
+	 */
+	private static final Pattern SINGLE_SLASH_FILE_URI = Pattern.compile("^" //
+			+ "(file):(/(?!/)" //
+			+ PATH_P //
+			+ ")$");
+
+	/**
+	 * A pattern matching a SCP URI's of the form user@host:path/to/repo.git
 	 */
 	private static final Pattern SCP_URI = Pattern.compile("^" //
 			+ OPT_USER_PWD_P //
@@ -173,7 +183,12 @@ public class URIish implements Serializable {
 	 */
 	public URIish(String s) throws URISyntaxException {
 		s = s.replace('\\', '/');
-		Matcher matcher = FULL_URI.matcher(s);
+		Matcher matcher = SINGLE_SLASH_FILE_URI.matcher(s);
+		if (matcher.matches()) {
+			scheme = matcher.group(1);
+			path = cleanLeadingSlashes(matcher.group(2), scheme);
+		} else {
+			matcher = FULL_URI.matcher(s);
 			if (matcher.matches()) {
 				scheme = matcher.group(1);
 				user = matcher.group(2);
@@ -182,7 +197,8 @@ public class URIish implements Serializable {
 				if (matcher.group(5) != null)
 					port = Integer.parseInt(matcher.group(5));
 				path = cleanLeadingSlashes(
-					n2e(matcher.group(6)) + n2e(matcher.group(7)), scheme);
+						n2e(matcher.group(6)) + n2e(matcher.group(7)),
+						scheme);
 			} else {
 				matcher = SCP_URI.matcher(s);
 				if (matcher.matches()) {
@@ -200,6 +216,7 @@ public class URIish implements Serializable {
 				}
 			}
 		}
+	}
 
 	private String n2e(String s) {
 		if (s == null)