Merge branch 'fwslash/download-command'

api/api.go

@@ -60,6 +60,32 @@ func Fetch(url string) ([]*Problem, error) {
 	return payload.Problems, nil
 }
 
+func Download(url string) (*Submission, error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	payload := &PayloadSubmission{}
+	dec := json.NewDecoder(res.Body)
+	err = dec.Decode(payload)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing API response - %s", err)
+	}
+
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf(`unable to fetch Submission (HTTP: %d) - %s`, res.StatusCode, payload.Error)
+	}
+
+	return payload.Submission, err
+}
+
 // Demo fetches the first problem in each language track.
 func Demo(c *config.Config) ([]*Problem, error) {
 	url := fmt.Sprintf("%s/problems/demo?key=%s", c.XAPI, c.APIKey)

api/submission.go

@@ -2,9 +2,12 @@ package api
 
 // Submission is an iteration that has been submitted to the API.
 type Submission struct {
-	URL      string `json:"url"`
-	TrackID  string `json:"track_id"`
-	Language string `json:"language"`
-	Slug     string `json:"slug"`
-	Name     string `json:"name"`
+	URL           string            `json:"url"`
+	TrackID       string            `json:"track_id"`
+	Language      string            `json:"language"`
+	Slug          string            `json:"slug"`
+	Name          string            `json:"name"`
+	Username      string            `json:"username"`
+	ProblemFiles  map[string]string `json:"problem_files"`
+	SolutionFiles map[string]string `json:"solution_files"`
 }

bin/build

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-set -e
-
 go build -o out/exercism exercism/main.go
+
+set -e

cmd/download.go

@@ -0,0 +1,59 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/codegangsta/cli"
+	"github.com/exercism/cli/api"
+	"github.com/exercism/cli/config"
+)
+
+// Download returns specified submissions and related problem.
+func Download(ctx *cli.Context) {
+	c, err := config.Read(ctx.GlobalString("config"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	args := ctx.Args()
+
+	if len(args) != 1 {
+		msg := "Usage: exercism download SUBMISSION_ID"
+		log.Fatal(msg)
+	}
+
+	var url string
+	url = fmt.Sprintf("%s/api/v1/submissions/%s", c.API, args[0])
+
+	submission, err := api.Download(url)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var path string
+
+	path = filepath.Join(c.Dir, "solutions", submission.Username, submission.Language, submission.Slug, args[0])
+
+	if err := os.MkdirAll(path, 0755); err != nil {
+		log.Fatal(err)
+	}
+
+	for name, contents := range submission.ProblemFiles {
+		if err := ioutil.WriteFile(fmt.Sprintf("%s/%s", path, name), []byte(contents), 0755); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	for name, contents := range submission.SolutionFiles {
+		if err := ioutil.WriteFile(fmt.Sprintf("%s/%s", path, name), []byte(contents), 0755); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	fmt.Printf("Successfully downloaded submission.\n\nThe submission can be viewed at:\n %s\n\n", path)
+
+}

exercism/main.go

@@ -30,6 +30,7 @@ const (
 	descLogout    = "DEPRECATED: Clear exercism.io api credentials"
 
 	descLongRestore = "Restore will pull the latest revisions of exercises that have already been submitted. It will *not* overwrite existing files. If you have made changes to a file and have not submitted it, and you're trying to restore the last submitted version, first move that file out of the way, then call restore."
+	descDownload    = "Downloads and saves a specified submission into the local system"
 )
 
 func main() {
@@ -123,6 +124,12 @@ func main() {
 			Usage:     descTracks,
 			Action:    cmd.Tracks,
 		},
+		{
+			Name:      "download",
+			ShortName: "dl",
+			Usage:     descDownload,
+			Action:    cmd.Download,
+		},
 	}
 	if err := app.Run(os.Args); err != nil {