Fix URIish parsing of absolute scp-style URIs

We stopped handling URIs such as "example.com:/some/p ath", because
this was confused with the Windows absolute path syntax of "c:/path".
Support absolute style scp URIs again, but only when the host name
is more than 2 characters long.

Change-Id: I9ab049bc9aad2d8d42a78c7ab34fa317a28efc1a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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

@@ -172,7 +172,7 @@ public class URIishTest extends TestCase {
 		assertEquals(u, new URIish(str));
 	}
 
-	public void testScpStyleWithoutUser() throws Exception {
+	public void testScpStyleWithoutUserRelativePath() throws Exception {
 		final String str = "example.com:some/p ath";
 		URIish u = new URIish(str);
 		assertNull(u.getScheme());
@@ -184,6 +184,18 @@ public class URIishTest extends TestCase {
 		assertEquals(u, new URIish(str));
 	}
 
+	public void testScpStyleWithoutUserAbsolutePath() throws Exception {
+		final String str = "example.com:/some/p ath";
+		URIish u = new URIish(str);
+		assertNull(u.getScheme());
+		assertTrue(u.isRemote());
+		assertEquals("/some/p ath", u.getPath());
+		assertEquals("example.com", u.getHost());
+		assertEquals(-1, u.getPort());
+		assertEquals(str, u.toString());
+		assertEquals(u, new URIish(str));
+	}
+
 	public void testScpStyleWithUser() throws Exception {
 		final String str = "user@example.com:some/p ath";
 		URIish u = new URIish(str);

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

@@ -155,7 +155,7 @@ public class URIish implements Serializable {
 	/**
 	 * A pattern matching a SCP URI's of the form user@host:path/to/repo.git
 	 */
-	private static final Pattern SCP_URI = Pattern.compile("^" //
+	private static final Pattern RELATIVE_SCP_URI = Pattern.compile("^" //
 			+ OPT_USER_PWD_P //
 			+ HOST_P //
 			+ ":(" //
@@ -163,6 +163,16 @@ public class URIish implements Serializable {
 			+ RELATIVE_PATH_P //
 			+ ")$");
 
+	/**
+	 * A pattern matching a SCP URI's of the form user@host:/path/to/repo.git
+	 */
+	private static final Pattern ABSOLUTE_SCP_URI = Pattern.compile("^" //
+			+ OPT_USER_PWD_P //
+			+ "([^/:]{2,})" //
+			+ ":(" //
+			+ "/" + RELATIVE_PATH_P //
+			+ ")$");
+
 	private String scheme;
 
 	private String path;
@@ -200,7 +210,14 @@ public class URIish implements Serializable {
 						n2e(matcher.group(6)) + n2e(matcher.group(7)),
 						scheme);
 			} else {
-				matcher = SCP_URI.matcher(s);
+				matcher = RELATIVE_SCP_URI.matcher(s);
+				if (matcher.matches()) {
+					user = matcher.group(1);
+					pass = matcher.group(2);
+					host = matcher.group(3);
+					path = matcher.group(4);
+				} else {
+					matcher = ABSOLUTE_SCP_URI.matcher(s);
 					if (matcher.matches()) {
 						user = matcher.group(1);
 						pass = matcher.group(2);
@@ -217,6 +234,7 @@ public class URIish implements Serializable {
 				}
 			}
 		}
+	}
 
 	private String n2e(String s) {
 		if (s == null)