We could use a hasExt function in std.path

[Andrej Mitrovic]

At least on Windows, as far as I know, the casing of a file extension doesn't come into play. But when comparing extensions, you have to be careful to lowercase the result of `getExt()`, for example:

foreach (string name; dirEntries(curdir, SpanMode.shallow))
{
    if (name.isFile && name.getExt == "txt")
    {
        // do something
    }
}

If the extension is cased "tXt", the if block will not be entered. That's a silent bug in your code right there!

I think we could use a function in Phobos that returns true if an extension of a file matches any number of strings passed to it (a range). And an extra argument could be a flag (enum) or a boolean which can set the case sensitivity to true, but is false by default, e.g.:

bool hasExt(Range)(string fileName, Range exts, bool caseSensitive = false)
{
    static if (isSomeString!Range)
    {
        if (caseSensitive)
        {
            if (exts == fileName.getExt)
                return true;
        }
        else
        {
            if (exts.tolower == fileName.getExt.tolower)
                return true;
        }        
    }
    else
    {
        foreach (ext; exts)
        {
            if (caseSensitive)
            {
                if (ext == fileName.getExt)
                    return true;
            }
            else
            {
                if (ext.tolower == fileName.getExt.tolower)
                    return true;
            }
        }        
    }

    return false;
}

foreach (string name; dirEntries(curdir, SpanMode.shallow))
{
    if (name.isFile && name.hasExt(["ini", "conf"]))
    {
        // do something
    }
}

Yes, that is a horrible implementation, but I can't be bothered with trying to make it nice and simple right now, I'm in a rush. Sorry. :)

I often have to search for files that have a certain extension. Having to expand the code to the following becomes ugly real fast:

foreach (string name; dirEntries(curdir, SpanMode.shallow))
{
    if (name.isFile && name.hasExt.tolower == "ini" ||
                   name.hasExt.tolower == "conf"))
    {
        // do something
    }
}