protogen(first-pass): do full first-pass on demand when generate specified workbooks

[wenchy]

If the types in specified workbooks do not reference other types not in them self, then there is no need to do the full first-pass compiling.

tableau/internal/protogen/protogen.go

Lines 133 to 150 in 92b805c

	func (gen *Generator) GenWorkbook(relWorkbookPaths ...string) error {
	// first pass
	switch gen.InputOpt.FirstPassMode {
	case options.FirstPassModeNormal:
	if err := gen.preprocess(false, false); err != nil {
	return err
	}
	log.Infof("%15s: parsing all books", "first-pass")
	if err := gen.processFirstPass(false); err != nil {
	return err
	}
	case options.FirstPassModeAdvanced:
	log.Infof("%15s: parsing previous generated proto files", "first-pass")
	if err := gen.preprocess(true, false); err != nil {
	return err
	}
	log.Infof("%15s: parsing only specified books", "first-pass")
	if err := gen.processWorkbookOnFirstPass(relWorkbookPaths...); err != nil {