How to implement glob in C#

Question

I don\'t know if it\'s legit at StackOverflow to post your own answer to a question, but I saw nobody had asked this already. I went looking for a C# Glob and didn\'t find

Answer 1

    /// 

    /// return a list of files that matches some wildcard pattern, e.g. 
    /// C:\p4\software\dotnet\tools\*\*.sln to get all tool solution files
    /// 
    /// pattern to match
    /// all matching paths
    public static IEnumerable Glob(string glob)
    {
        foreach (string path in Glob(PathHead(glob) + DirSep, PathTail(glob)))
            yield return path;
    }

    /// 

    /// uses 'head' and 'tail' -- 'head' has already been pattern-expanded
    /// and 'tail' has not.
    /// 
    /// wildcard-expanded
    /// not yet wildcard-expanded
    /// 
    public static IEnumerable Glob(string head, string tail)
    {
        if (PathTail(tail) == tail)
            foreach (string path in Directory.GetFiles(head, tail).OrderBy(s => s))
                yield return path;
        else
            foreach (string dir in Directory.GetDirectories(head, PathHead(tail)).OrderBy(s => s))
                foreach (string path in Glob(Path.Combine(head, dir), PathTail(tail)))
                    yield return path;
    }

    /// 

    /// shortcut
    /// 
    static char DirSep = Path.DirectorySeparatorChar;

    /// 

    /// return the first element of a file path
    /// 
    /// file path
    /// first logical unit
    static string PathHead(string path)
    {
        // handle case of \\share\vol\foo\bar -- return \\share\vol as 'head'
        // because the dir stuff won't let you interrogate a server for its share list
        // FIXME check behavior on Linux to see if this blows up -- I don't think so
        if (path.StartsWith("" + DirSep + DirSep))
            return path.Substring(0, 2) + path.Substring(2).Split(DirSep)[0] + DirSep + path.Substring(2).Split(DirSep)[1];

        return path.Split(DirSep)[0];
    }

    /// 

    /// return everything but the first element of a file path
    /// e.g. PathTail("C:\TEMP\foo.txt") = "TEMP\foo.txt"
    /// 
    /// file path
    /// all but the first logical unit
    static string PathTail(string path)
    {
        if (!path.Contains(DirSep))
            return path;

        return path.Substring(1 + PathHead(path).Length);
    }