Refactor search for a file within a PATH

Change-Id: I785ab6bf1823d174394b1d2b25c5bb202535e943

org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java

@@ -199,4 +199,15 @@ public abstract class FS {
 			return null;
 		return new File(home).getAbsoluteFile();
 	}
+
+	static File searchPath(final String path, final String... lookFor) {
+		for (final String p : path.split(File.pathSeparator)) {
+			for (String command : lookFor) {
+				final File e = new File(p, command);
+				if (e.isFile())
+					return e.getAbsoluteFile();
+			}
+		}
+		return null;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java

@@ -62,14 +62,10 @@ class FS_Win32_Cygwin extends FS_Win32 {
 				});
 		if (path == null)
 			return false;
-		for (final String p : path.split(";")) {
-			final File e = new File(p, "cygpath.exe");
-			if (e.isFile()) {
-				cygpath = e.getAbsolutePath();
-				return true;
-			}
-		}
-		return false;
+		File found = FS.searchPath(path, "cygpath.exe");
+		if (found != null)
+			cygpath = found.getPath();
+		return cygpath != null;
 	}
 
 	public File resolve(final File dir, final String pn) {