return only the data that we need

Track have extra data we don't really need. Start with a simple data
type and add to it as needed.

Author: lcowell

api/api.go

@@ -129,7 +129,7 @@ func Submit(url string, iter *Iteration) (*Submission, error) {
 }
 
 // List available problems for a language
-func List(language, host string) (*Track, error) {
+func List(language, host string) ([]string, error) {
 	url := fmt.Sprintf("%s/tracks/%s", host, language)
 
 	req, err := http.NewRequest("GET", url, nil)
@@ -150,7 +150,7 @@ func List(language, host string) (*Track, error) {
 		return nil, err
 	}
 
-	return &payload.Track, nil
+	return payload.Track.Problems, nil
 }
 
 // Unsubmit deletes a submission.

api/api_test.go

@@ -25,8 +25,8 @@ func TestListTrack(t *testing.T) {
 	}))
 	defer ts.Close()
 
-	track, err := List("ruby", ts.URL)
+	problems, err := List("ruby", ts.URL)
 	assert.NoError(t, err)
 
-	assert.Equal(t, len(track.Problems), 34)
+	assert.Equal(t, len(problems), 34)
 }

cmd/list.go

@@ -28,16 +28,16 @@ func List(ctx *cli.Context) {
 
 	language := args[0]
 
-	track, err := api.List(language, c.XAPI)
+	problems, err := api.List(language, c.XAPI)
 	if err != nil {
 		log.Fatal(err)
 	}
-	GenerateOutput(track, os.Stdout)
+	GenerateOutput(problems, os.Stdout)
 }
 
 // Output writes out the list of assignments
-func GenerateOutput(t *api.Track, w io.Writer) {
-	for _, p := range t.Problems {
+func GenerateOutput(problems []string, w io.Writer) {
+	for _, p := range problems {
 		fmt.Fprintf(w, "%s\n", p)
 	}
 	fmt.Fprintf(w, "\n%s\n\n", msgExplainFetch)

cmd/list_test.go

@@ -4,15 +4,14 @@ import (
 	"bytes"
 	"testing"
 
-	"github.com/exercism/cli/api"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestProducesCorrectOutput(t *testing.T) {
 	b := bytes.Buffer{}
-	track := api.Track{Problems: []string{"ruby/bob", "ruby/word-count"}}
+	problems := []string{"ruby/bob", "ruby/word-count"}
 
-	GenerateOutput(&track, &b)
+	GenerateOutput(problems, &b)
 
 	expected := "ruby/bob\nruby/word-count\n\n" + msgExplainFetch + "\n\n"
 	assert.Equal(t, expected, b.String())