Get *slightly* serious and fix the rest of the bugs

plugins/picker/picker.go

@@ -30,7 +30,7 @@ func New(bot bot.Bot) *PickerPlugin {
 // This function returns true if the plugin responds in a meaningful way to the users message.
 // Otherwise, the function returns false and the bot continues execution of other plugins.
 func (p *PickerPlugin) Message(message msg.Message) bool {
-	if !strings.HasPrefix(body, "pick") {
+	if !strings.HasPrefix(message.Body, "pick") {
 		return false
 	}
 
@@ -63,8 +63,9 @@ func (p *PickerPlugin) Message(message msg.Message) bool {
 	return true
 }
 
-var pickerListPrologue = regexp.MustCompile(`^pick[ \t]+([0-9]*)[ \t]+\{[ \t]+`)
-var pickerListItem = regexp.MustCompile(`^([^,]+),[ \t]+`)
+var pickerListPrologue = regexp.MustCompile(`^pick[ \t]+([0-9]*)[ \t]+\{[ \t]*`)
+var pickerListItem = regexp.MustCompile(`^([^,]+),[ \t]*`)
+var pickerListFinalItem = regexp.MustCompile(`^([^,}]+),?[ \t]*\}[ \t]*`)
 
 func (p *PickerPlugin) parse(body string) (int, []string, error) {
 	subs := pickerListPrologue.FindStringSubmatch(body)
@@ -93,9 +94,11 @@ func (p * PickerPlugin) parse(body string) (int, []string, error) {
 		rest = rest[len(subs[0]):]
 	}
 
-	if strings.TrimSpace(rest) != "}" {
+	subs = pickerListFinalItem.FindStringSubmatch(rest)
+	if subs == nil {
 		return 0, nil, errors.New("lasso yerself that final curly brace, compadre")
 	}
+	items = append(items, subs[1])
 
 	if n < 1 || n > len(items) {
 		return 0, nil, errors.New("whoah there, bucko, I can't create something out of nothing")

plugins/picker/picker_test.go

@@ -0,0 +1,37 @@
+// © 2018 the CatBase Authors under the WTFPL. See AUTHORS for the list of authors.
+
+package picker
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/velour/catbase/bot"
+	"github.com/velour/catbase/bot/msg"
+	"github.com/velour/catbase/bot/user"
+)
+
+func makeMessage(payload string) msg.Message {
+	isCmd := strings.HasPrefix(payload, "!")
+	if isCmd {
+		payload = payload[1:]
+	}
+	return msg.Message{
+		User:    &user.User{Name: "tester"},
+		Channel: "test",
+		Body:    payload,
+		Command: isCmd,
+	}
+}
+
+func TestReplacement(t *testing.T) {
+	mb := bot.NewMockBot()
+	c := New(mb)
+	assert.NotNil(t, c)
+	res := c.Message(makeMessage("!pick 2 { a, b,c}"))
+	assert.Len(t, mb.Messages, 1)
+	if !res {
+		t.Fatalf("expected a successful choice, got %q", mb.Messages[0])
+	}
+}