fix(proxy): use and define arity to set transparent input (#172)

.vscode/settings.json

@@ -74,6 +74,7 @@
     "plog",
     "prealloc",
     "promptui",
+    "randemoji",
     "repotoken",
     "samber",
     "sidewalk",

src/app/proxy/enter-shrink.go

@@ -148,7 +148,7 @@ func (e *ShrinkEntry) run() (result *nav.TraverseResult, err error) {
 		e.PrincipalOptionsFn,
 		runnerWith,
 		resumption,
-		e.Inputs.Root.PreviewFam.Native.DryRun,
+		e.Inputs,
 	))
 
 	return result, err
@@ -169,13 +169,25 @@ func EnterShrink(
 		err   error
 	)
 
+	schemes := params.Inputs.Root.Configs.Schemes
+	selectedScheme := params.Inputs.Root.ProfileFam.Native.Scheme
+	scheme, _ := schemes.Scheme(selectedScheme)
+	noProfiles := lo.TernaryF(scheme == nil,
+		func() uint {
+			return 1
+		},
+		func() uint {
+			return uint(len(scheme.Profiles()))
+		},
+	)
 	finder := filing.NewFinder(&filing.NewFinderInfo{
 		Advanced:   params.Inputs.Root.Configs.Advanced,
-		Schemes:    params.Inputs.Root.Configs.Schemes,
-		Scheme:     params.Inputs.Root.ProfileFam.Native.Scheme,
+		Schemes:    schemes,
+		Scheme:     selectedScheme,
 		OutputPath: params.Inputs.ParamSet.Native.OutputPath,
 		TrashPath:  params.Inputs.ParamSet.Native.TrashPath,
 		Observer:   params.Inputs.Root.Observers.PathFinder,
+		Arity:      noProfiles,
 	})
 	fileManager := filing.NewManager(params.Vfs, finder,
 		params.Inputs.Root.PreviewFam.Native.DryRun,

src/app/proxy/filing/file-manager.go

@@ -38,7 +38,7 @@ func (fm *FileManager) Finder() common.PathFinder {
 
 func (fm *FileManager) Create(path string, overwrite bool) error {
 	if fm.Vfs.FileExists(path) && !overwrite {
-		return os.ErrExist
+		return errors.Wrapf(os.ErrExist, "could not create file at path: '%v'", path)
 	}
 
 	file, err := fm.Vfs.Create(path)

src/app/proxy/filing/path-finder.go

@@ -18,6 +18,7 @@ type NewFinderInfo struct {
 	OutputPath string
 	TrashPath  string
 	Observer   common.PathFinder
+	Arity      uint
 }
 
 func NewFinder(
@@ -179,7 +180,7 @@ func (f *PathFinder) init(info *NewFinderInfo) {
 	// When the user specifies an alternative location for the results to be sent to
 	// with the --output flag, then the input is no longer transparent, as the user has
 	// to go to the output location to see the result.
-	f.transparentInput = info.OutputPath == ""
+	f.transparentInput = info.OutputPath == "" && info.Arity == 1
 
 	journal := info.Advanced.JournalLabel()