closes #5

flags.go

@@ -53,9 +53,10 @@ func usage() {
 	}
 	// --> tags
 	fmt.Println(opt("-t, --tags", "Filter scenarios by tags. Expression can be:"))
-	fmt.Println(opt("", s(4)+"- "+cl(`"wip"`, yellow)+": run all scenarios with wip tag"))
-	fmt.Println(opt("", s(4)+"- "+cl(`"!wip"`, yellow)+": exclude all scenarios with wip tag"))
-	fmt.Println(opt("", s(4)+"- "+cl(`"wip !new"`, yellow)+": run wip scenarios, but exclude new"))
+	fmt.Println(opt("", s(4)+"- "+cl(`"@wip"`, yellow)+": run all scenarios with wip tag"))
+	fmt.Println(opt("", s(4)+"- "+cl(`"~@wip"`, yellow)+": exclude all scenarios with wip tag"))
+	fmt.Println(opt("", s(4)+"- "+cl(`"@wip && ~@new"`, yellow)+": run wip scenarios, but exclude new"))
+	fmt.Println(opt("", s(4)+"- "+cl(`"@wip,@undone"`, yellow)+": run wip or undone scenarios"))
 	// --> stop on failure
 	fmt.Println(opt("--stop-on-failure", "Stop processing on first failed scenario."))
 	// --> version

suite.go

@@ -477,20 +477,30 @@ func (s *suite) applyTagFilter(ft *gherkin.Feature) {
 		return
 	}
 
-	for _, tag := range strings.Split(s.tags, " ") {
-		var scenarios []*gherkin.Scenario
-		var inverse bool
-		if tag[0] == '!' {
-			tag = tag[1:]
-			inverse = true
+	var scenarios []*gherkin.Scenario
+	for _, scenario := range ft.Scenarios {
+		if s.matchesTags(scenario.Tags) {
+			scenarios = append(scenarios, scenario)
 		}
-		for _, scenario := range ft.Scenarios {
-			if inverse && !scenario.Tags.Has(gherkin.Tag(tag)) {
-				scenarios = append(scenarios, scenario)
-			} else if !inverse && scenario.Tags.Has(gherkin.Tag(tag)) {
-				scenarios = append(scenarios, scenario)
+	}
+	ft.Scenarios = scenarios
+}
+
+// based on http://behat.readthedocs.org/en/v2.5/guides/6.cli.html#gherkin-filters
+func (s *suite) matchesTags(tags gherkin.Tags) (ok bool) {
+	ok = true
+	for _, andTags := range strings.Split(s.tags, "&&") {
+		var okComma bool
+		for _, tag := range strings.Split(andTags, ",") {
+			tag = strings.Replace(strings.TrimSpace(tag), "@", "", -1)
+			if tag[0] == '~' {
+				tag = tag[1:]
+				okComma = !tags.Has(gherkin.Tag(tag)) || okComma
+			} else {
+				okComma = tags.Has(gherkin.Tag(tag)) || okComma
 			}
 		}
-		ft.Scenarios = scenarios
+		ok = (false != okComma && ok && okComma) || false
 	}
+	return
 }

tag_filter_test.go

@@ -0,0 +1,41 @@
+package godog
+
+import (
+	"testing"
+
+	"github.com/DATA-DOG/godog/gherkin"
+)
+
+func assertNotMatchesTagFilter(tags []string, filter string, t *testing.T) {
+	gtags := gherkin.Tags{}
+	for _, tag := range tags {
+		gtags = append(gtags, gherkin.Tag(tag))
+	}
+	s := &suite{tags: filter}
+	if s.matchesTags(gtags) {
+		t.Errorf(`expected tags: %v not to match tag filter "%s", but it did`, gtags, filter)
+	}
+}
+
+func assertMatchesTagFilter(tags []string, filter string, t *testing.T) {
+	gtags := gherkin.Tags{}
+	for _, tag := range tags {
+		gtags = append(gtags, gherkin.Tag(tag))
+	}
+	s := &suite{tags: filter}
+	if !s.matchesTags(gtags) {
+		t.Errorf(`expected tags: %v to match tag filter "%s", but it did not`, gtags, filter)
+	}
+}
+
+func Test_tag_filter(t *testing.T) {
+	assertMatchesTagFilter([]string{"wip"}, "@wip", t)
+	assertMatchesTagFilter([]string{}, "~@wip", t)
+	assertMatchesTagFilter([]string{"one", "two"}, "@two,@three", t)
+	assertMatchesTagFilter([]string{"one", "two"}, "@one&&@two", t)
+	assertMatchesTagFilter([]string{"one", "two"}, "one && two", t)
+
+	assertNotMatchesTagFilter([]string{}, "@wip", t)
+	assertNotMatchesTagFilter([]string{"one", "two"}, "@one&&~@two", t)
+	assertNotMatchesTagFilter([]string{"one", "two"}, "@one && ~@two", t)
+}