Enable helmfile-diff to pass the output format to helm-diff (#1784)

* tests: fix vagrant test run

* feat: added an option to specify the different diff output format

* renamed diff-output to output

* renamed diff-output to output

Co-authored-by: Andrey Tuzhilin <andrey@zelf.co>

pkg/app/app.go

@@ -1153,6 +1153,7 @@ func (a *App) apply(r *Run, c ApplyConfigProvider) (bool, bool, []error) {
 	diffOpts := &state.DiffOpts{
 		NoColor:           c.NoColor(),
 		Context:           c.Context(),
+		Output:            c.DiffOutput(),
 		Set:               c.Set(),
 		SkipCleanup:       c.RetainValuesFiles() || c.SkipCleanup(),
 		SkipDiffOnInstall: c.SkipDiffOnInstall(),
@@ -1378,6 +1379,7 @@ func (a *App) diff(r *Run, c DiffConfigProvider) (*string, bool, bool, []error)
 
 	opts := &state.DiffOpts{
 		Context: c.Context(),
+		Output:  c.DiffOutput(),
 		NoColor: c.NoColor(),
 		Set:     c.Set(),
 	}

pkg/app/app_test.go

@@ -2331,6 +2331,7 @@ type applyConfig struct {
 	suppressDiff      bool
 	noColor           bool
 	context           int
+	diffOutput        string
 	concurrency       int
 	detailedExitcode  bool
 	interactive       bool
@@ -2408,6 +2409,10 @@ func (a applyConfig) Context() int {
 	return a.context
 }
 
+func (a applyConfig) DiffOutput() string {
+	return a.diffOutput
+}
+
 func (a applyConfig) Concurrency() int {
 	return a.concurrency
 }

pkg/app/config.go

@@ -54,6 +54,7 @@ type ApplyConfigProvider interface {
 
 	NoColor() bool
 	Context() int
+	DiffOutput() string
 
 	RetainValuesFiles() bool
 	SkipCleanup() bool
@@ -104,6 +105,7 @@ type DiffConfigProvider interface {
 	DetailedExitcode() bool
 	NoColor() bool
 	Context() int
+	DiffOutput() string
 
 	concurrencyConfig
 }

pkg/app/diff_test.go

@@ -32,6 +32,7 @@ type diffConfig struct {
 	suppressDiff      bool
 	noColor           bool
 	context           int
+	diffOutput        string
 	concurrency       int
 	detailedExitcode  bool
 	interactive       bool
@@ -94,6 +95,10 @@ func (a diffConfig) Context() int {
 	return a.context
 }
 
+func (a diffConfig) DiffOutput() string {
+	return a.diffOutput
+}
+
 func (a diffConfig) Concurrency() int {
 	return a.concurrency
 }

pkg/state/state.go

@@ -1664,6 +1664,10 @@ func (st *HelmState) prepareDiffReleases(helm helmexec.Interface, additionalValu
 					flags = append(flags, "--context", fmt.Sprintf("%d", opts.Context))
 				}
 
+				if opts.Output != "" {
+					flags = append(flags, "--output", fmt.Sprintf("%s", opts.Output))
+				}
+
 				if opts.Set != nil {
 					for _, s := range opts.Set {
 						flags = append(flags, "--set", s)
@@ -1739,6 +1743,7 @@ func (st *HelmState) createHelmContextWithWriter(spec *ReleaseSpec, w io.Writer)
 
 type DiffOpts struct {
 	Context int
+	Output  string
 	NoColor bool
 	Set     []string