add merged source for diff

README.md

@@ -221,6 +221,8 @@ Global Flags:
       --profile string   Configuration profile
 ```
 
+> **Note:** Use `--source merged` flag to show only the changes that will be applied to the remote branch, instead of displaying the complete configuration difference. It ignores all skipped entities and fields.
+
 Sample execution
 
 ```

internal/cac/api/source.go

@@ -13,6 +13,7 @@ var ErrUnknownSource = errors.New("unknown source")
 const (
 	SourceLocal  SourceType = "local"
 	SourceRemote SourceType = "remote"
+	SourceMerged SourceType = "merged"
 )
 
 func SourceFromString(s string) (SourceType, error) {
@@ -21,6 +22,8 @@ func SourceFromString(s string) (SourceType, error) {
 		return SourceLocal, nil
 	case "remote":
 		return SourceRemote, nil
+	case "merged":
+		return SourceMerged, nil
 	}
 
 	return "", ErrUnknownSource

internal/cac/app.go

@@ -117,6 +117,34 @@ func (a *Application) PickSource(source string, tenant bool) (api.Source, error)
 		}
 
 		return c, nil
+	case api.SourceMerged:
+		var (
+			c   *client.Client
+			err error
+		)
+
+		ms, err := storage.InitMultiStorage(conf.Storage, constructor)
+
+		if err != nil {
+			return nil, err
+		}
+
+		storages := ms.Storages
+
+		if c, err = client.InitClient(conf.Client); err != nil {
+			return nil, err
+		}
+
+		if !tenant {
+			storages = append(storages, c)
+		} else {
+			storages = append(storages, c.Tenant())
+		}
+
+		return &storage.MultiStorage{
+			Storages: storages,
+			Config:   ms.Config,
+		}, nil
 	}
 
 	return nil, api.ErrUnknownSource

internal/cac/diff/diff.go

@@ -2,12 +2,14 @@ package diff
 
 import (
 	"context"
+	"regexp"
+
 	"github.com/cloudentity/acp-client-go/clients/hub/models"
 	"github.com/cloudentity/cac/internal/cac/api"
 	"github.com/cloudentity/cac/internal/cac/utils"
 	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"golang.org/x/exp/slog"
-	"regexp"
 )
 
 type Options struct {
@@ -162,10 +164,15 @@ func Tree(source models.Rfc7396PatchOperation, target models.Rfc7396PatchOperati
 		diffOpts = append(diffOpts, filterSecretFields)
 	}
 
-	var out = cmp.Diff(target, source, diffOpts)
+	// sorting slices to avoid diffs due to different order
+	diffOpts = append(diffOpts, cmpopts.SortSlices(func(a, b string) bool {
+		return a < b
+	}))
+
+	out := cmp.Diff(target, source, diffOpts)
 
 	if options.Color {
-		return colorize(out), nil
+		out = colorize(out)
 	}
 
 	return out, nil