refactor(tour) extract chapters

tour/all.go

@@ -1,6 +1,9 @@
 package tour
 
-import "sort"
+import (
+	"fmt"
+	"sort"
+)
 
 func init() {
 	for _, t := range allTopics {
@@ -11,20 +14,33 @@ func init() {
 	sort.Sort(IDSlice(IDs))
 }
 
+var (
+	Introduction = Chapter(0)
+	FileBasics   = Chapter(1)
+	NodeBasics   = Chapter(2)
+	MerkleDag    = Chapter(3)
+	Network      = Chapter(4)
+	Daemon       = Chapter(5)
+	Routing      = Chapter(6)
+	Exchange     = Chapter(7)
+	Ipns         = Chapter(8)
+	Mounting     = Chapter(9)
+	Plumbing     = Chapter(10)
+	Formats      = Chapter(11)
+)
+
 // Topics contains a mapping of Tour Topic ID to Topic
 var allTopics = []Topic{
-	Topic{ID: ID("0.0"), Content: IntroHelloMars},
-	Topic{ID: ID("0.1"), Content: IntroTour},
-	Topic{ID: ID("0.2"), Content: IntroAboutIpfs},
+	Topic{ID: Introduction(0), Content: IntroHelloMars},
+	Topic{ID: Introduction(1), Content: IntroTour},
+	Topic{ID: Introduction(2), Content: IntroAboutIpfs},
 
-	// File Basics
-	Topic{ID: ID("X.0"), Content: FileBasicsFilesystem},
-	Topic{ID: ID("X.1"), Content: FileBasicsGetting},
-	Topic{ID: ID("X.2"), Content: FileBasicsAdding},
-	Topic{ID: ID("X.3"), Content: FileBasicsDirectories},
-	Topic{ID: ID("X.3"), Content: FileBasicsDirectories},
-	Topic{ID: ID("X.4"), Content: FileBasicsMounting},
-	Topic{ID: ID("X.2"), Content: FileBasicsAdding},
+	Topic{ID: FileBasics(1), Content: FileBasicsFilesystem},
+	Topic{ID: FileBasics(2), Content: FileBasicsGetting},
+	Topic{ID: FileBasics(3), Content: FileBasicsAdding},
+	Topic{ID: FileBasics(4), Content: FileBasicsDirectories},
+	Topic{ID: FileBasics(5), Content: FileBasicsDistributed},
+	Topic{ID: FileBasics(6), Content: FileBasicsMounting},
 }
 
 // Introduction
@@ -77,3 +93,9 @@ var FileBasicsMounting = Content{
 	Text: `ipfs mount (simple)
 	`,
 }
+
+func Chapter(number int) func(topic int) ID {
+	return func(topic int) ID {
+		return ID(fmt.Sprintf("%d.%d", number, topic))
+	}
+}