go2idl: Allow ... pkg specs

This is closer to standard Go semantics and obsoletes our custom --recursive
flag.

cmd/libs/go2idl/args/args.go

@@ -54,9 +54,6 @@ type GeneratorArgs struct {
 	// Which directories to parse.
 	InputDirs []string
 
-	// If true, recurse into all children of InputDirs
-	Recursive bool
-
 	// Source tree to write results to.
 	OutputBase string
 
@@ -89,7 +86,6 @@ func (g *GeneratorArgs) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVarP(&g.OutputFileBaseName, "output-file-base", "O", g.OutputFileBaseName, "Base name (without .go suffix) for output files.")
 	fs.StringVarP(&g.GoHeaderFilePath, "go-header-file", "h", g.GoHeaderFilePath, "File containing boilerplate header text. The string YEAR will be replaced with the current 4-digit year.")
 	fs.BoolVar(&g.VerifyOnly, "verify-only", g.VerifyOnly, "If true, only verify existing output, do not write anything.")
-	fs.BoolVar(&g.Recursive, "recursive", g.VerifyOnly, "If true, recurse into all children of input directories.")
 	fs.StringVar(&g.GeneratedBuildTag, "build-tag", g.GeneratedBuildTag, "A Go build tag to use to identify files generated by this command. Should be unique.")
 }
 
@@ -111,14 +107,14 @@ func (g *GeneratorArgs) NewBuilder() (*parser.Builder, error) {
 	b.AddBuildTags(g.GeneratedBuildTag)
 
 	for _, d := range g.InputDirs {
-		if g.Recursive {
-			if err := b.AddDirRecursive(d); err != nil {
-				return nil, fmt.Errorf("unable to add directory %q: %v", d, err)
-			}
+		var err error
+		if strings.HasSuffix(d, "/...") {
+			err = b.AddDirRecursive(strings.TrimSuffix(d, "/..."))
 		} else {
-			if err := b.AddDir(d); err != nil {
-				return nil, fmt.Errorf("unable to add directory %q: %v", d, err)
-			}
+			err = b.AddDir(d)
+		}
+		if err != nil {
+			return nil, fmt.Errorf("unable to add directory %q: %v", d, err)
 		}
 	}
 	return b, nil