Merge pull request exercism#828 from larson004/remove-duplicate-files

Remove duplicate files before submitting

cmd/submit.go

@@ -66,6 +66,8 @@ func runSubmit(cfg config.Config, flags *pflag.FlagSet, args []string) error {
 		return err
 	}
 
+	submitPaths = ctx.removeDuplicatePaths(submitPaths)
+
 	if err = ctx.validator.filesBelongToSameExercise(submitPaths); err != nil {
 		return err
 	}
@@ -146,6 +148,20 @@ func (s *submitCmdContext) evaluatedSymlinks(submitPaths []string) ([]string, er
 	return evalSymlinkSubmitPaths, nil
 }
 
+func (s *submitCmdContext) removeDuplicatePaths(submitPaths []string) []string {
+	seen := make(map[string]bool)
+	result := make([]string, 0, len(submitPaths))
+
+	for _, val := range submitPaths {
+		if _, ok := seen[val]; !ok {
+			seen[val] = true
+			result = append(result, val)
+		}
+	}
+
+	return result
+}
+
 // exercise creates an exercise using one of the submitted filepaths.
 // This assumes prior verification that submit paths belong to the same exercise.
 func (s *submitCmdContext) exercise(aSubmitPath string) (workspace.Exercise, error) {

cmd/submit_test.go

@@ -142,6 +142,45 @@ func TestSubmitFilesAndDir(t *testing.T) {
 	}
 }
 
+func TestDuplicateFiles(t *testing.T) {
+	co := newCapturedOutput()
+	co.override()
+	defer co.reset()
+
+	// The fake endpoint will populate this when it receives the call from the command.
+	submittedFiles := map[string]string{}
+	ts := fakeSubmitServer(t, submittedFiles)
+	defer ts.Close()
+
+	tmpDir, err := ioutil.TempDir("", "duplicate-files")
+	defer os.RemoveAll(tmpDir)
+	assert.NoError(t, err)
+
+	dir := filepath.Join(tmpDir, "bogus-track", "bogus-exercise")
+	os.MkdirAll(dir, os.FileMode(0755))
+
+	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
+
+	v := viper.New()
+	v.Set("token", "abc123")
+	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", ts.URL)
+
+	cfg := config.Config{
+		Persister:       config.InMemoryPersister{},
+		UserViperConfig: v,
+	}
+
+	file1 := filepath.Join(dir, "file-1.txt")
+	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+
+	err = runSubmit(cfg, pflag.NewFlagSet("fake", pflag.PanicOnError), []string{file1, file1})
+	assert.NoError(t, err)
+
+	assert.Equal(t, 1, len(submittedFiles))
+	assert.Equal(t, "This is file 1.", submittedFiles["file-1.txt"])
+}
+
 func TestSubmitFiles(t *testing.T) {
 	co := newCapturedOutput()
 	co.override()