Allow the user to exclude folder paths

cmd/pkger/cmds/pack.go

@@ -31,6 +31,7 @@ type packCmd struct {
 	*flag.FlagSet
 	out     string
 	help    bool
+	exclude slice
 	include slice
 	subs    []command
 }
@@ -48,6 +49,11 @@ func (e *packCmd) Exec(args []string) error {
 	fp := filepath.Join(info.Dir, e.out, outName)
 	os.RemoveAll(fp)
 
+	exclude := []string(e.exclude)
+	if len(exclude) > 0 {
+		parser.DefaultIgnoredFolders = append(parser.DefaultIgnoredFolders, exclude...)
+	}
+
 	decls, err := parser.Parse(info, e.include...)
 	if err != nil {
 		return err
@@ -104,6 +110,7 @@ func New() (*packCmd, error) {
 	c.FlagSet = flag.NewFlagSet("pkger", flag.ExitOnError)
 	c.BoolVar(&c.help, "h", false, "prints help information")
 	c.StringVar(&c.out, "o", "", "output directory for pkged.go")
+	c.Var(&c.exclude, "exclude", "folder prefix to ignore")
 	c.Var(&c.include, "include", "packages the specified file or directory")
 	c.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Usage:\n\n")

parser/parser.go

@@ -14,7 +14,7 @@ import (
 	"github.com/markbates/pkger/here"
 )
 
-var defaultIgnoredFolders = []string{".", "_", "vendor", "node_modules", "testdata"}
+var DefaultIgnoredFolders = []string{".", "_", "vendor", "node_modules", "testdata"}
 
 func New(her here.Info) (*Parser, error) {
 	return &Parser{
@@ -108,12 +108,8 @@ func (p *Parser) ParseDir(abs string, mode parser.Mode) ([]*ParsedSource, error)
 		return nil, fmt.Errorf("%s: here.Parse failed %s", err, abs)
 	}
 
-	filter := func(f os.FileInfo) bool {
-		return !f.IsDir()
-	}
-
 	fset := token.NewFileSet()
-	pkgs, err := parser.ParseDir(fset, abs, filter, 0)
+	pkgs, err := parser.ParseDir(fset, abs, nil, 0)
 	if err != nil {
 		return nil, fmt.Errorf("%s: ParseDir failed %s", err, abs)
 	}
@@ -200,7 +196,7 @@ func (p *Parser) parse() error {
 		}
 
 		base := filepath.Base(path)
-		for _, x := range defaultIgnoredFolders {
+		for _, x := range DefaultIgnoredFolders {
 			if strings.HasPrefix(base, x) {
 				return filepath.SkipDir
 			}