Add include/exclude example to docs

[gmwxio]

Example

Filters out dot directories and file with no dot (ie linux exec)

not sure if this is the best way of doing this.

// Assets contains project assets.
var vfs_Assets = filterFS{http.Dir(".")}

type filterFS struct {
	fs http.FileSystem
}

func (verFS filterFS) Open(name string) (http.File, error) {
	fmt.Printf("vfs %s\n", name)
	fi, er := verFS.fs.Open(name)
	if er != nil {
		return nil, er
	}
	return filterReaddirFile{fi}, nil
}

type filterReaddirFile struct {
	http.File
}

func (f filterReaddirFile) Readdir(count int) ([]os.FileInfo, error) {
	fis := make([]os.FileInfo, 0)
	fii, err := f.File.Readdir(count)
	if err != nil {
		return nil, err
	}
	for _, fi := range fii {
		if fi.IsDir() && fi.Name()[:1] == "." {
			continue
		}
		if fi.IsDir() || strings.Contains(fi.Name(), ".") {
			fis = append(fis, fi)
		}
	}
	return fis, nil
}

[dmitshur]

Hi, thanks for the suggestion.

not sure if this is the best way of doing this.

That's a reasonable way of doing it.

I've also done this using the github.com/shurcooL/httpfs/filter package. See here for an example.

I will think about it and consider how it can be added to the README. I think there's some re-organization work that needs to happen in order to have a better place to put this kind of general information.

[millergarym]

Thanks, ok now I get filter.Skip().
You have a preference for functions where I was probably expecting an interface, and therefore found it a bit difficult to parse the api.

An example or two could go a long way.
How about an example http server, where the exec bundles up its own resource. In "dev" mode it uses local fs, in prod it used vfs (pretty standard stuff), and it can lay the resources back on the disk.

git clone git@github.com-wxio:wxio/vfsgen.git
cd vfsgen/example
go build -tags dev
./vfsexample bundle # go.mod so exec is vfsexample not example
go build
mv vfsexample /tmp/
cd /tmp
./vfsexample extract

By the way take a look at https://github.com/wxio/opts - its a replacement for cobra and pflags.