Allow user to optionally fetch a specific exercise.

This is getting pretty tangled. There has to be a better way of
structuring this.

Author: kytrinyx

api.go

@@ -12,9 +12,10 @@ import (
 const VERSION = "1.2.3"
 
 var FetchEndpoints = map[string]string{
-	"current": "/api/v1/user/assignments/current",
-	"next":    "/api/v1/user/assignments/next",
-	"demo":    "/api/v1/assignments/demo",
+	"current":  "/api/v1/user/assignments/current",
+	"next":     "/api/v1/user/assignments/next",
+	"demo":     "/api/v1/assignments/demo",
+	"exercise": "/api/v1/assignments",
 }
 
 type submitResponse struct {

fetch_endpoint.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+)
+
+func FetchEndpoint(args []string) string {
+	if len(args) == 0 {
+		return FetchEndpoints["current"]
+	} else {
+		return fmt.Sprintf("%s/%s/%s", FetchEndpoints["exercise"], args[0], args[1])
+	}
+}

fetch_endpoint_test.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestFetchCurrentEndpoint(t *testing.T) {
+	expected := "/api/v1/user/assignments/current"
+	actual := FetchEndpoint([]string{})
+	assert.Equal(t, expected, actual)
+}
+
+func TestFetchExerciseEndpoint(t *testing.T) {
+	expected := "/api/v1/assignments/language/slug"
+	actual := FetchEndpoint([]string{"language", "slug"})
+	assert.Equal(t, expected, actual)
+}

main.go

@@ -69,15 +69,29 @@ func main() {
 		{
 			Name:      "fetch",
 			ShortName: "f",
-			Usage:     "Fetch current assignment from exercism.io",
+			Usage:     "Fetch assignments from exercism.io",
 			Action: func(c *cli.Context) {
+				if len(c.Args()) != 0 && len(c.Args()) != 2 {
+					fmt.Println("Usage: exercism fetch\n   or: exercism fetch LANGUAGE EXERCISE")
+					return
+				}
+
 				config, err := configuration.FromFile(configuration.HomeDir())
+
 				if err != nil {
-					fmt.Println("Are you sure you are logged in? Please login again.")
-					return
+					if len(c.Args()) == 0 {
+						fmt.Println("Are you sure you are logged in? Please login again.")
+						return
+					} else {
+						config, err = configuration.Demo()
+						if err != nil {
+							fmt.Println(err)
+							return
+						}
+					}
 				}
-				assignments, err := FetchAssignments(config,
-					FetchEndpoints["current"])
+
+				assignments, err := FetchAssignments(config, FetchEndpoint(c.Args()))
 				if err != nil {
 					fmt.Println(err)
 					return