feat: add slack manifest diff command

cmd/manifest/diff.go

@@ -0,0 +1,83 @@
+// Copyright 2022-2026 Salesforce, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package manifest
+
+import (
+	"github.com/opentracing/opentracing-go"
+	"github.com/slackapi/slack-cli/internal/app"
+	"github.com/slackapi/slack-cli/internal/cmdutil"
+	"github.com/slackapi/slack-cli/internal/manifest"
+	"github.com/slackapi/slack-cli/internal/prompts"
+	"github.com/slackapi/slack-cli/internal/shared"
+	"github.com/slackapi/slack-cli/internal/style"
+	"github.com/spf13/cobra"
+)
+
+// NewDiffCommand implements the "manifest diff" command, which prints the
+// differences between the project manifest and the app settings on Slack.
+func NewDiffCommand(clients *shared.ClientFactory) *cobra.Command {
+	return &cobra.Command{
+		Use:   "diff",
+		Short: "Show differences between the project manifest and app settings",
+		Long:  "Compare the project manifest with app settings and print any differences.",
+		Example: style.ExampleCommandsf([]style.ExampleCommand{
+			{Command: "manifest diff", Meaning: "Show differences between project manifest and app settings"},
+			{Command: "manifest diff --app A0123456789 --token xoxp-...", Meaning: "Show manifest differences without prompts"},
+		}),
+		Args: cobra.NoArgs,
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			return cmdutil.IsValidProjectDirectory(clients)
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+			span, ctx := opentracing.StartSpanFromContext(ctx, "cmd.manifest.diff")
+			defer span.Finish()
+
+			selection, err := appSelectPromptFunc(ctx, clients, prompts.ShowAllEnvironments, prompts.ShowInstalledAppsOnly)
+			if err != nil {
+				return err
+			}
+
+			clients.Config.ManifestEnv = app.SetManifestEnvTeamVars(clients.Config.ManifestEnv, selection.App.TeamDomain, selection.App.IsDev)
+
+			localManifest, err := clients.AppClient().Manifest.GetManifestLocal(ctx, clients.SDKConfig, clients.HookExecutor)
+			if err != nil {
+				return err
+			}
+
+			remoteManifest, err := clients.AppClient().Manifest.GetManifestRemote(ctx, selection.Auth.Token, selection.App.AppID)
+			if err != nil {
+				return err
+			}
+
+			diffs, err := manifest.Diff(localManifest.AppManifest, remoteManifest.AppManifest)
+			if err != nil {
+				return err
+			}
+
+			if !diffs.HasDifferences() {
+				clients.IO.PrintInfo(ctx, false, "\n%s", style.Sectionf(style.TextSection{
+					Emoji:     "books",
+					Text:      "App Manifest",
+					Secondary: []string{"Project manifest and app settings match"},
+				}))
+				return nil
+			}
+
+			manifest.DisplayDiffs(ctx, clients.IO, diffs)
+			return nil
+		},
+	}
+}

cmd/manifest/diff_test.go

@@ -0,0 +1,90 @@
+// Copyright 2022-2026 Salesforce, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package manifest
+
+import (
+	"context"
+	"testing"
+
+	"github.com/slackapi/slack-cli/internal/app"
+	"github.com/slackapi/slack-cli/internal/hooks"
+	"github.com/slackapi/slack-cli/internal/prompts"
+	"github.com/slackapi/slack-cli/internal/shared"
+	"github.com/slackapi/slack-cli/internal/shared/types"
+	"github.com/slackapi/slack-cli/test/testutil"
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/mock"
+)
+
+func TestDiffCommand(t *testing.T) {
+	testutil.TableTestCommand(t, testutil.CommandTests{
+		"prints match message when manifests match": {
+			Setup: func(t *testing.T, ctx context.Context, cm *shared.ClientsMock, cf *shared.ClientFactory) {
+				appSelectMock := prompts.NewAppSelectMock()
+				appSelectPromptFunc = appSelectMock.AppSelectPrompt
+				appSelectMock.On("AppSelectPrompt", mock.Anything, mock.Anything, prompts.ShowAllEnvironments, prompts.ShowInstalledAppsOnly).Return(
+					prompts.SelectedApp{
+						App:  types.App{AppID: "A001"},
+						Auth: types.SlackAuth{Token: "xapp"},
+					}, nil)
+				manifestMock := &app.ManifestMockObject{}
+				manifestMock.On("GetManifestLocal", mock.Anything, mock.Anything, mock.Anything).Return(types.SlackYaml{
+					AppManifest: types.AppManifest{
+						DisplayInformation: types.DisplayInformation{Name: "App"},
+					},
+				}, nil)
+				manifestMock.On("GetManifestRemote", mock.Anything, mock.Anything, mock.Anything).Return(types.SlackYaml{
+					AppManifest: types.AppManifest{
+						DisplayInformation: types.DisplayInformation{Name: "App"},
+					},
+				}, nil)
+				cf.AppClient().Manifest = manifestMock
+				cf.SDKConfig = hooks.NewSDKConfigMock()
+			},
+			ExpectedOutputs: []string{"match"},
+		},
+		"prints differences when project and app settings disagree": {
+			Setup: func(t *testing.T, ctx context.Context, cm *shared.ClientsMock, cf *shared.ClientFactory) {
+				appSelectMock := prompts.NewAppSelectMock()
+				appSelectPromptFunc = appSelectMock.AppSelectPrompt
+				appSelectMock.On("AppSelectPrompt", mock.Anything, mock.Anything, prompts.ShowAllEnvironments, prompts.ShowInstalledAppsOnly).Return(
+					prompts.SelectedApp{
+						App:  types.App{AppID: "A002"},
+						Auth: types.SlackAuth{Token: "xapp"},
+					}, nil)
+				manifestMock := &app.ManifestMockObject{}
+				manifestMock.On("GetManifestLocal", mock.Anything, mock.Anything, mock.Anything).Return(types.SlackYaml{
+					AppManifest: types.AppManifest{
+						DisplayInformation: types.DisplayInformation{Name: "Project Name"},
+					},
+				}, nil)
+				manifestMock.On("GetManifestRemote", mock.Anything, mock.Anything, mock.Anything).Return(types.SlackYaml{
+					AppManifest: types.AppManifest{
+						DisplayInformation: types.DisplayInformation{Name: "Remote Name"},
+					},
+				}, nil)
+				cf.AppClient().Manifest = manifestMock
+				cf.SDKConfig = hooks.NewSDKConfigMock()
+			},
+			ExpectedOutputs: []string{
+				"display_information.name",
+				"Project Name",
+				"Remote Name",
+			},
+		},
+	}, func(clients *shared.ClientFactory) *cobra.Command {
+		return NewDiffCommand(clients)
+	})
+}

cmd/manifest/manifest.go

@@ -80,6 +80,7 @@ func NewCommand(clients *shared.ClientFactory) *cobra.Command {
 	}
 
 	// Add child commands
+	cmd.AddCommand(NewDiffCommand(clients))
 	cmd.AddCommand(NewInfoCommand(clients))
 	cmd.AddCommand(NewValidateCommand(clients))