Compare original PR body on release notes mapping

cmd/krel/cmd/release_notes.go

@@ -1154,6 +1154,7 @@ func fixReleaseNotes(workDir string, releaseNotes *notes.ReleaseNotes) error {
 			ActionRequired: note.ActionRequired,
 			Documentation:  note.Documentation,
 			DoNotPublish:   note.DoNotPublish,
+			PRBody:         note.PRBody,
 		}
 
 		if noteMaps != nil {
@@ -1410,6 +1411,8 @@ func editReleaseNote(pr int, workDir string, originalNote, modifiedNote *notes.R
 		return true, errors.New("invalid map: the YAML code did not have a PR number")
 	}
 
+	testMap.PRBody = &originalNote.PRBody
+
 	// Remarshall the newyaml to save only the new values
 	newYAML, err := yaml.Marshal(testMap)
 	if err != nil {

go.mod

@@ -25,6 +25,7 @@ require (
 	github.com/saschagrunert/go-modiff v1.3.5
 	github.com/sendgrid/rest v2.6.9+incompatible
 	github.com/sendgrid/sendgrid-go v3.14.0+incompatible
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3
 	github.com/shirou/gopsutil/v3 v3.24.3
 	github.com/shurcooL/githubv4 v0.0.0-20220115235240-a14260e6f8a2
 	github.com/sirupsen/logrus v1.9.3
@@ -226,7 +227,6 @@ require (
 	github.com/sassoftware/relic v7.2.1+incompatible // indirect
 	github.com/secure-systems-lab/go-securesystemslib v0.8.0 // indirect
 	github.com/segmentio/ksuid v1.0.4 // indirect
-	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/shurcooL/graphql v0.0.0-20230722043721-ed46e5a46466 // indirect
 	github.com/sigstore/cosign/v2 v2.2.2 // indirect

pkg/notes/notes.go

@@ -37,6 +37,7 @@ import (
 
 	gogithub "github.com/google/go-github/v58/github"
 	"github.com/nozzle/throttler"
+	"github.com/sergi/go-diff/diffmatchpatch"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/text/cases"
 	"golang.org/x/text/language"
@@ -139,6 +140,9 @@ type ReleaseNote struct {
 
 	// IsMapped is set if the note got modified from a map
 	IsMapped bool `json:"is_mapped,omitempty"`
+
+	// PRBody is the full PR body of the release note
+	PRBody string `json:"pr_body,omitempty"`
 }
 
 type Documentation struct {
@@ -518,6 +522,7 @@ func (g *Gatherer) ReleaseNoteFromCommit(result *Result) (*ReleaseNote, error) {
 		DuplicateKind:  isDuplicateKind,
 		ActionRequired: labelExactMatch(pr, "release-note-action-required"),
 		DoNotPublish:   labelExactMatch(pr, "release-note-none"),
+		PRBody:         prBody,
 	}, nil
 }
 
@@ -757,6 +762,7 @@ func (g *Gatherer) ReleaseNoteForPullRequest(prNr int) (*ReleaseNote, error) {
 		ActionRequired: false,
 		DoNotPublish:   doNotPublish,
 		DataFields:     map[string]ReleaseNotesDataField{},
+		PRBody:         prBody,
 	}
 
 	if s != "" {
@@ -1151,6 +1157,14 @@ func (rn *ReleaseNote) ApplyMap(noteMap *ReleaseNotesMap, markdownLinks bool) er
 	}).Debugf("Applying map to note")
 	rn.IsMapped = true
 
+	if noteMap.PRBody != nil && rn.PRBody != "" && rn.PRBody != *noteMap.PRBody {
+		logrus.Warnf("Original PR body of release note mapping changed for PR: #%d", rn.PrNumber)
+
+		dmp := diffmatchpatch.New()
+		diffs := dmp.DiffMain(rn.PRBody, *noteMap.PRBody, false)
+		logrus.Warnf("The diff between actual release note body and mapped one is:\n%s", dmp.DiffPrettyText(diffs))
+	}
+
 	reRenderMarkdown := false
 	if noteMap.ReleaseNote.Author != nil {
 		rn.Author = *noteMap.ReleaseNote.Author
@@ -1231,6 +1245,7 @@ func (rn *ReleaseNote) ToNoteMap() (string, error) {
 	noteMap.ReleaseNote.Feature = &rn.Feature
 	noteMap.ReleaseNote.ActionRequired = &rn.ActionRequired
 	noteMap.ReleaseNote.DoNotPublish = &rn.DoNotPublish
+	noteMap.PRBody = &rn.PRBody
 
 	yamlCode, err := yaml.Marshal(&noteMap)
 	if err != nil {

pkg/notes/notes_map.go

@@ -117,6 +117,9 @@ type ReleaseNotesMap struct {
 	} `json:"releasenote"`
 
 	DataFields map[string]ReleaseNotesDataField `json:"datafields,omitempty" yaml:"datafields,omitempty"`
+
+	// PRBody is the full original PR body.
+	PRBody *string `json:"pr_body,omitempty" yaml:"pr_body,omitempty"`
 }
 
 // ReleaseNotesDataField extra data added to a release note