add support to ignore certain files in the .sheets directory

[mov37]

So that files like "README.md" inside the .sheets directory won't be listed as a sheet.

[oscardelben]

I could ignore all files that have a custom extension. What do you think?

[mov37]

I think ignore readme files with all common format would be sufficient, since there's little sense to put any other kind of files inside the .sheet directory.

[oscardelben]

It seems a bit tricky to exclude files with ls, do you know how you would go about it? If there's not an easy way I may try with find or echo instead.

[mov37]

I found a solution here.

But this only works with bash as far as I know, I have no idea how this can be done with other shells.

[n0nick]

Hey,

Why not use Ruby's Dir?

Dir.glob("*[^.md]")

http://ruby-doc.org/core-1.9.3/Dir.html

[oscardelben]

That sounds reasonable. I may ignore all files that start with readme.