feat: also support regexp

Support for filtering commits with regexp.

Refs #284

docs/115-release.md

@@ -43,11 +43,12 @@ You can customize how the changelog is generated using the
 # .goreleaser.yml
 changelog:
   filters:
-    # commit messages containing the words listed here will be removed from
+    # commit messages matching the regexp listed here will be removed from
     # the changelog
     exclude:
-      - docs
+      - '^docs:'
       - typo
+      - (?i)foo
 ```
 
 ## Custom release notes

pipeline/changelog/changelog.go

@@ -3,11 +3,13 @@ package changelog
 
 import (
 	"fmt"
+	"regexp"
 	"strings"
 
 	"github.com/goreleaser/goreleaser/context"
 	"github.com/goreleaser/goreleaser/internal/git"
 	"github.com/goreleaser/goreleaser/pipeline"
+	"github.com/pkg/errors"
 )
 
 // Pipe for checksums
@@ -32,21 +34,30 @@ func (Pipe) Run(ctx *context.Context) error {
 	}
 	var entries = strings.Split(log, "\n")
 	for _, filter := range ctx.Config.Changelog.Filters.Exclude {
-		entries = filterLog(filter, entries)
+		r, err := regexp.Compile(filter)
+		if err != nil {
+			return errors.Wrapf(err, "couldn't compile regexp %s", filter)
+		}
+		entries = remove(r, entries)
 	}
 	ctx.ReleaseNotes = fmt.Sprintf("## Changelog\n\n%v", strings.Join(entries, "\n"))
 	return nil
 }
 
-func filterLog(filter string, entries []string) (result []string) {
+func remove(filter *regexp.Regexp, entries []string) (result []string) {
 	for _, entry := range entries {
-		if !strings.Contains(entry, filter) {
+		if !match(filter, entry) {
 			result = append(result, entry)
 		}
 	}
 	return result
 }
 
+func match(filter *regexp.Regexp, line string) bool {
+	s := strings.Join(strings.SplitAfter(line, " ")[1:], "")
+	return filter.MatchString(s)
+}
+
 func getChangelog(tag string) (string, error) {
 	prev, err := previous(tag)
 	if err != nil {

pipeline/changelog/changelog_test.go

@@ -36,7 +36,10 @@ func TestChangelog(t *testing.T) {
 	testlib.GitCommit(t, "fixed bug 2")
 	testlib.GitCommit(t, "ignored: whatever")
 	testlib.GitCommit(t, "docs: whatever")
+	testlib.GitCommit(t, "something about cArs we dont need")
 	testlib.GitCommit(t, "feat: added that thing")
+	testlib.GitCommit(t, "Merge pull request #999 from goreleaser/some-branch")
+	testlib.GitCommit(t, "this is not a Merge pull request")
 	testlib.GitTag(t, "v0.0.2")
 	var ctx = context.New(config.Project{
 		Changelog: config.Changelog{
@@ -44,6 +47,8 @@ func TestChangelog(t *testing.T) {
 				Exclude: []string{
 					"docs:",
 					"ignored:",
+					"(?i)cars",
+					"^Merge pull request",
 				},
 			},
 		},
@@ -57,6 +62,8 @@ func TestChangelog(t *testing.T) {
 	assert.Contains(t, ctx.ReleaseNotes, "fixed bug 2")
 	assert.NotContains(t, ctx.ReleaseNotes, "docs")
 	assert.NotContains(t, ctx.ReleaseNotes, "ignored")
+	assert.NotContains(t, ctx.ReleaseNotes, "cArs")
+	assert.NotContains(t, ctx.ReleaseNotes, "from goreleaser/some-branch")
 }
 
 func TestChangelogOfFirstRelease(t *testing.T) {