add support for exclude rules

pkg/result/processors/exclude_rules_test.go

@@ -0,0 +1,34 @@
+package processors
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+func TestExcludeRules(t *testing.T) {
+	p := NewExcludeRules([]ExcludeRule{
+		{
+			Text: "^exclude$",
+		},
+	})
+	texts := []string{"excLude", "1", "", "exclud", "notexclude"}
+	var issues []result.Issue
+	for _, t := range texts {
+		issues = append(issues, newTextIssue(t))
+	}
+
+	processedIssues := process(t, p, issues...)
+	assert.Len(t, processedIssues, len(issues)-1)
+
+	var processedTexts []string
+	for _, i := range processedIssues {
+		processedTexts = append(processedTexts, i.Text)
+	}
+	assert.Equal(t, texts[1:], processedTexts)
+	t.Run("Empty", func(t *testing.T) {
+		processAssertSame(t, NewExcludeRules(nil), newTextIssue("test"))
+	})
+}