feat: added the filter ability to changelog pipe

We can now ignore some commits from the changelog by providing the
`changelog.filters.excludes` array of strings in the config
file.

Refs #284

config/config.go

@@ -195,7 +195,6 @@ type Docker struct {
 
 // Filters config
 type Filters struct {
-	Include []string `yaml:",omitempty"`
 	Exclude []string `yaml:",omitempty"`
 }
 

pipeline/changelog/changelog.go

@@ -3,6 +3,7 @@ package changelog
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/goreleaser/goreleaser/context"
 	"github.com/goreleaser/goreleaser/internal/git"
@@ -29,10 +30,23 @@ func (Pipe) Run(ctx *context.Context) error {
 	if err != nil {
 		return err
 	}
-	ctx.ReleaseNotes = fmt.Sprintf("## Changelog\n\n%v", log)
+	var entries = strings.Split(log, "\n")
+	for _, filter := range ctx.Config.Changelog.Filters.Exclude {
+		entries = filterLog(filter, entries)
+	}
+	ctx.ReleaseNotes = fmt.Sprintf("## Changelog\n\n%v", strings.Join(entries, "\n"))
 	return nil
 }
 
+func filterLog(filter string, entries []string) (result []string) {
+	for _, entry := range entries {
+		if !strings.Contains(entry, filter) {
+			result = append(result, entry)
+		}
+	}
+	return result
+}
+
 func getChangelog(tag string) (string, error) {
 	prev, err := previous(tag)
 	if err != nil {

pipeline/changelog/changelog_test.go

@@ -34,8 +34,20 @@ func TestChangelog(t *testing.T) {
 	testlib.GitTag(t, "v0.0.1")
 	testlib.GitCommit(t, "added feature 1")
 	testlib.GitCommit(t, "fixed bug 2")
+	testlib.GitCommit(t, "ignored: whatever")
+	testlib.GitCommit(t, "docs: whatever")
+	testlib.GitCommit(t, "feat: added that thing")
 	testlib.GitTag(t, "v0.0.2")
-	var ctx = context.New(config.Project{})
+	var ctx = context.New(config.Project{
+		Changelog: config.Changelog{
+			Filters: config.Filters{
+				Exclude: []string{
+					"docs:",
+					"ignored:",
+				},
+			},
+		},
+	})
 	ctx.Git.CurrentTag = "v0.0.2"
 	assert.NoError(t, Pipe{}.Run(ctx))
 	assert.Equal(t, "v0.0.2", ctx.Git.CurrentTag)
@@ -43,6 +55,8 @@ func TestChangelog(t *testing.T) {
 	assert.NotContains(t, ctx.ReleaseNotes, "first")
 	assert.Contains(t, ctx.ReleaseNotes, "added feature 1")
 	assert.Contains(t, ctx.ReleaseNotes, "fixed bug 2")
+	assert.NotContains(t, ctx.ReleaseNotes, "docs")
+	assert.NotContains(t, ctx.ReleaseNotes, "ignored")
 }
 
 func TestChangelogOfFirstRelease(t *testing.T) {