fix(use): Move use up to cmd/ from lib/. Delete select from repo/

cmd/diff.go

@@ -104,6 +104,8 @@ func (o *DiffOptions) Run() (err error) {
 		Selector:  o.Selector,
 	}
 
+	// TODO(dlong): Reenable `use` functionality for this command.
+
 	res := &lib.DiffResponse{}
 	if err = o.DatasetRequests.Diff(p, res); err != nil {
 		return err

cmd/export.go

@@ -64,8 +64,9 @@ type ExportOptions struct {
 
 // Complete adds any missing configuration that can only be added just before calling Run
 func (o *ExportOptions) Complete(f Factory, args []string) (err error) {
-	if len(args) > 0 {
-		o.Ref = args[0]
+	o.Ref, err = GetDatasetRefString(f, args, 0)
+	if err != nil {
+		return err
 	}
 	if f.RPC() != nil {
 		return usingRPCError("export")

cmd/factory.go

@@ -36,7 +36,6 @@ type Factory interface {
 	ProfileMethods() (*lib.ProfileMethods, error)
 	SearchRequests() (*lib.SearchRequests, error)
 	RenderRequests() (*lib.RenderRequests, error)
-	SelectionRequests() (*lib.SelectionRequests, error)
 }
 
 // PathFactory is a function that returns paths to qri & ipfs repos

cmd/factory_test.go

@@ -146,11 +146,6 @@ func (t TestFactory) ProfileMethods() (*lib.ProfileMethods, error) {
 	return lib.NewProfileMethods(t.inst), nil
 }
 
-// SelectionRequests creates a lib.SelectionRequests from internal state
-func (t TestFactory) SelectionRequests() (*lib.SelectionRequests, error) {
-	return lib.NewSelectionRequests(t.repo, t.rpc), nil
-}
-
 // SearchRequests generates a lib.SearchRequests from internal state
 func (t TestFactory) SearchRequests() (*lib.SearchRequests, error) {
 	return lib.NewSearchRequests(t.node, t.rpc), nil

cmd/get.go

@@ -92,7 +92,15 @@ func (o *GetOptions) Complete(f Factory, args []string) (err error) {
 			args = args[1:]
 		}
 	}
-	o.Refs = args
+	o.Refs = make([]string, 0, len(args))
+	for i := range args {
+		var ref string
+		ref, err = GetDatasetRefString(f, args, i)
+		if err != nil {
+			return
+		}
+		o.Refs = append(o.Refs, ref)
+	}
 	if o.DatasetRequests, err = f.DatasetRequests(); err != nil {
 		return
 	}
@@ -123,14 +131,6 @@ func (o *GetOptions) Complete(f Factory, args []string) (err error) {
 
 // Run executes the get command
 func (o *GetOptions) Run() (err error) {
-	var path string
-	if len(o.Refs) > 0 {
-		path = o.Refs[0]
-		if err != nil {
-			return err
-		}
-	}
-
 	// Pretty maps to a key in the FormatConfig map.
 	var fc dataset.FormatConfig
 	if o.HasPretty {
@@ -142,6 +142,11 @@ func (o *GetOptions) Run() (err error) {
 	// convert Page and PageSize to Limit and Offset
 	page := util.NewPage(o.Page, o.PageSize)
 
+	var path string
+	if len(o.Refs) > 0 {
+		// TODO(dlong): Restore ability to `get` from multiple datasets at once.
+		path = o.Refs[0]
+	}
 	p := lib.GetParams{
 		Path:         path,
 		Selector:     o.Selector,

cmd/log.go

@@ -59,10 +59,7 @@ type LogOptions struct {
 
 // Complete adds any missing configuration that can only be added just before calling Run
 func (o *LogOptions) Complete(f Factory, args []string) (err error) {
-	if len(args) > 0 {
-		o.Ref = args[0]
-	}
-
+	o.Ref, err = GetDatasetRefString(f, args, 0)
 	if err != nil {
 		return err
 	}

cmd/qri.go

@@ -224,14 +224,6 @@ func (o *QriOptions) ProfileMethods() (m *lib.ProfileMethods, err error) {
 	return lib.NewProfileMethods(o.inst), nil
 }
 
-// SelectionRequests creates a lib.SelectionRequests from internal state
-func (o *QriOptions) SelectionRequests() (*lib.SelectionRequests, error) {
-	if err := o.Init(); err != nil {
-		return nil, err
-	}
-	return lib.NewSelectionRequests(o.inst.Repo(), o.inst.RPC()), nil
-}
-
 // SearchRequests generates a lib.SearchRequests from internal state
 func (o *QriOptions) SearchRequests() (*lib.SearchRequests, error) {
 	if err := o.Init(); err != nil {

cmd/render.go

@@ -60,8 +60,9 @@ type RenderOptions struct {
 
 // Complete adds any missing configuration that can only be added just before calling Run
 func (o *RenderOptions) Complete(f Factory, args []string) (err error) {
-	if len(args) > 0 {
-		o.Ref = args[0]
+	o.Ref, err = GetDatasetRefString(f, args, 0)
+	if err != nil {
+		return err
 	}
 	o.RenderRequests, err = f.RenderRequests()
 	return

cmd/use.go

@@ -1,14 +1,21 @@
 package cmd
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
 
 	"github.com/qri-io/ioes"
 	"github.com/qri-io/qri/lib"
 	"github.com/qri-io/qri/repo"
 	"github.com/spf13/cobra"
 )
 
+// FileSelectedRefs stores selection, is copied from github.com/qri-io/qri/repo/fs/files.go
+const FileSelectedRefs = "/selected_refs.json"
+
 // NewUseCommand creates a new `qri search` command that searches for datasets
 func NewUseCommand(f Factory, ioStreams ioes.IOStreams) *cobra.Command {
 	o := &UseOptions{IOStreams: ioStreams}
@@ -62,13 +69,13 @@ type UseOptions struct {
 	List  bool
 	Clear bool
 
-	SelectionRequests *lib.SelectionRequests
+	QriRepoPath string
 }
 
 // Complete adds any missing configuration that can only be added just before calling Run
 func (o *UseOptions) Complete(f Factory, args []string) (err error) {
+	o.QriRepoPath = f.QriRepoPath()
 	o.Refs = args
-	o.SelectionRequests, err = f.SelectionRequests()
 	return
 }
 
@@ -85,16 +92,21 @@ func (o *UseOptions) Validate() error {
 
 // Run executes the search command
 func (o *UseOptions) Run() (err error) {
-	var (
-		refs []repo.DatasetRef
-		res  bool
-	)
+	var refs []repo.DatasetRef
+	fileSelectionPath := filepath.Join(o.QriRepoPath, FileSelectedRefs)
 
 	if o.List {
-		if err = o.SelectionRequests.SelectedRefs(&res, &refs); err != nil {
+		refs, err = readFile(fileSelectionPath)
+		if err != nil {
+			return err
+		}
+	} else if o.Clear {
+		err := writeFile(fileSelectionPath, refs)
+		if err != nil {
 			return err
 		}
-	} else if len(o.Refs) > 0 || o.Clear {
+		printInfo(o.Out, "cleared selected datasets")
+	} else if len(o.Refs) > 0 {
 		for _, refstr := range o.Refs {
 			ref, err := repo.ParseDatasetRef(refstr)
 			if err != nil {
@@ -103,18 +115,73 @@ func (o *UseOptions) Run() (err error) {
 			refs = append(refs, ref)
 		}
 
-		if err = o.SelectionRequests.SetSelectedRefs(&refs, &res); err != nil {
+		err := writeFile(fileSelectionPath, refs)
+		if err != nil {
 			return err
 		}
-
-		if len(refs) == 0 {
-			printInfo(o.Out, "cleared selected datasets")
-			return nil
-		}
 	}
 
 	for _, ref := range refs {
 		fmt.Fprintln(o.Out, ref.String())
 	}
 	return nil
 }
+
+// GetDatasetRefString returns the arg at the index, or otherwise the first selected reference
+func GetDatasetRefString(f Factory, args []string, index int) (string, error) {
+	if index < len(args) {
+		return args[index], nil
+	}
+	refs, err := DefaultSelectedRefList(f)
+	if err != nil {
+		return "", err
+	}
+	if len(refs) == 0 {
+		// If selected_refs.json is empty or doesn't exist, not an error.
+		return "", nil
+	}
+	return refs[0], nil
+}
+
+// DefaultSelectedRefList returns the list of currently selected dataset references
+func DefaultSelectedRefList(f Factory) ([]string, error) {
+	fileSelectionPath := filepath.Join(f.QriRepoPath(), FileSelectedRefs)
+
+	refs, err := readFile(fileSelectionPath)
+	if err != nil {
+		// If selected_refs.json is empty or doesn't exist, not an error.
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	res := make([]string, 0, len(refs))
+	for _, r := range refs {
+		res = append(res, r.String())
+	}
+
+	return res, nil
+}
+
+// writeFile serializes the list of refs to a file at path
+func writeFile(path string, refs []repo.DatasetRef) error {
+	data, err := json.Marshal(refs)
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(path, data, os.ModePerm)
+}
+
+// readFile deserializes a list of refs from a file at path
+func readFile(path string) ([]repo.DatasetRef, error) {
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	res := []repo.DatasetRef{}
+	if err = json.Unmarshal(data, &res); err != nil {
+		return nil, err
+	}
+	return res, nil
+}

cmd/use_test.go

@@ -1,6 +1,8 @@
 package cmd
 
 import (
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -48,13 +50,6 @@ func TestUseComplete(t *testing.T) {
 			ioReset(in, out, errs)
 			continue
 		}
-
-		if opt.SelectionRequests == nil {
-			t.Errorf("case %d, opt.SelectionRequests not set.", i)
-			ioReset(in, out, errs)
-			continue
-		}
-		ioReset(in, out, errs)
 	}
 }
 
@@ -100,7 +95,20 @@ func TestUseRun(t *testing.T) {
 	streams, in, out, errs := ioes.NewTestIOStreams()
 	setNoColor(true)
 
-	f, err := NewTestFactory(nil)
+	tmpdir := filepath.Join(os.TempDir(), "qri_use_test")
+	//clean up if previous cleanup failed
+	if _, err := os.Stat(tmpdir); os.IsNotExist(err) {
+		if err := os.RemoveAll(tmpdir); err != nil {
+			t.Fatalf("failed to cleanup from previous test execution: %s", err.Error())
+		}
+	}
+	if err := os.MkdirAll(tmpdir, os.ModePerm); err != nil {
+		t.Errorf("error creating test path: %s", err.Error())
+		return
+	}
+	defer os.RemoveAll(tmpdir)
+
+	_, err := NewTestFactory(nil)
 	if err != nil {
 		t.Errorf("error creating new test factory: %s", err)
 		return
@@ -121,18 +129,12 @@ func TestUseRun(t *testing.T) {
 	}
 
 	for i, c := range cases {
-		slr, err := f.SelectionRequests()
-		if err != nil {
-			t.Errorf("case %d, error creating dataset request: %s", i, err)
-			continue
-		}
-
 		opt := &UseOptions{
-			IOStreams:         streams,
-			Refs:              c.refs,
-			List:              c.list,
-			Clear:             c.clear,
-			SelectionRequests: slr,
+			IOStreams:   streams,
+			Refs:        c.refs,
+			List:        c.list,
+			Clear:       c.clear,
+			QriRepoPath: tmpdir,
 		}
 
 		err = opt.Run()

cmd/validate.go

@@ -127,6 +127,8 @@ func (o *ValidateOptions) Run() (err error) {
 		}
 	}
 
+	// TODO(dlong): Reenable `use` functionality for this command. Also, change Ref to a string.
+
 	p := &lib.ValidateDatasetParams{
 		Ref: ref,
 		// TODO: restore

lib/datasets.go

@@ -103,15 +103,11 @@ func (r *DatasetRequests) Get(p *GetParams, res *GetResult) (err error) {
 	ref := &repo.DatasetRef{}
 
 	if p.Path == "" {
-		// Handle `qri use` to get the current default dataset.
-		if err = DefaultSelectedRef(r.node.Repo, ref); err != nil {
-			return
-		}
-	} else {
-		*ref, err = repo.ParseDatasetRef(p.Path)
-		if err != nil {
-			return fmt.Errorf("'%s' is not a valid dataset reference", p.Path)
-		}
+		return repo.ErrEmptyRef
+	}
+	*ref, err = repo.ParseDatasetRef(p.Path)
+	if err != nil {
+		return fmt.Errorf("'%s' is not a valid dataset reference", p.Path)
 	}
 	if err = repo.CanonicalizeDatasetRef(r.node.Repo, ref); err != nil {
 		return
@@ -554,10 +550,6 @@ func (r *DatasetRequests) Validate(p *ValidateDatasetParams, errors *[]jsonschem
 		return r.cli.Call("DatasetRequests.Validate", p, errors)
 	}
 
-	if err = DefaultSelectedRef(r.node.Repo, &p.Ref); err != nil {
-		return
-	}
-
 	// TODO: restore validating data from a URL
 	// if p.URL != "" && ref.IsEmpty() && o.Schema == nil {
 	//   return (lib.NewError(ErrBadArgs, "if you are validating data from a url, please include a dataset name or supply the --schema flag with a file path that Qri can validate against"))