fix up path handling

stepmania/src/RageFile.cpp

@@ -32,8 +32,9 @@ CString FixSlashes( CString sPath )
 
 void CollapsePath( CString &sPath )
 {
+	/* Don't ignore empty: we do want to keep trailing slashes. */
 	CStringArray as;
-	split( sPath, "/", as, true );
+	split( sPath, "/", as, false );
 
 	for( unsigned i=0; i<as.size(); i++ )
 	{
@@ -43,6 +44,12 @@ void CollapsePath( CString &sPath )
 			as.erase( as.begin()+i-1 );
 			i -= 2;
 		}
+		else if( as[i] == "" && i+1 < as.size() )
+		{
+			/* Remove empty parts that aren't at the end; "foo//bar/" -> "foo/bar/". */
+			as.erase( as.begin()+i );
+			i -= 1;
+		}
 		else if( as[i] == "." )
 		{
 			as.erase( as.begin()+i );

stepmania/src/RageUtil_FileDB.cpp

@@ -77,29 +77,30 @@ int FileSet::GetFileHash(const CString &path) const
 	return i->hash + i->size;
 }
 
-/* Given "foo/bar/baz/" or "foo/bar/baz", return "foo/bar/" and "baz". */
+/*
+ * Given "foo/bar/baz/" or "foo/bar/baz", return "foo/bar/" and "baz".
+ * "foo" -> "", "foo"
+ */
 static void SplitPath( CString Path, CString &Dir, CString &Name )
 {
-	/* Strip off any trailing slashes. */
-	if( Path.size() > 0 && Path.Right(1) == "/" )
+	CollapsePath( Path );
+	if( Path.Right(1) == "/" )
 		Path.erase( Path.size()-1 );
 
-	static Regex split("(.*/)([^/]+)");
-
-	CStringArray match;
-	if(split.Compare(Path, match)) {
-		/* At least one slash. */
-		Dir = match[0];
-		Name = match[1];
-	} else {
-		/* No slash. */
-		Dir = "./";
+	unsigned sep = Path.find_last_of( '/' );
+	if( sep == CString::npos )
+	{
+		Dir = "";
 		Name = Path;
 	}
+	else
+	{
+		Dir = Path.substr( 0, sep+1 );
+		Name = Path.substr( sep+1 );
+	}
 }
 
 
-
 FileType FilenameDB::GetFileType( const CString &sPath )
 {
 	CString Dir, Name;
@@ -211,6 +212,9 @@ FileSet &FilenameDB::GetFileSet( CString dir )
 	dir.Replace("\\", "/"); /* foo\bar -> foo/bar */
 	dir.Replace("//", "/"); /* foo//bar -> foo/bar */
 
+	if( dir == "" )
+		dir = ".";
+
 	CString lower = dir;
 	lower.MakeLower();