Closes #29. wtf.go --help [module name] returns help text if any is available.

help/help.go

@@ -3,6 +3,12 @@ package help
 import (
 	"fmt"
 	"os"
+
+	"github.com/senorprogrammer/wtf/git"
+	"github.com/senorprogrammer/wtf/github"
+	"github.com/senorprogrammer/wtf/textfile"
+	"github.com/senorprogrammer/wtf/todo"
+	"github.com/senorprogrammer/wtf/weather"
 )
 
 func DisplayCommandInfo(args []string, version string) {
@@ -14,15 +20,20 @@ func DisplayCommandInfo(args []string, version string) {
 
 	switch cmd {
 	case "help", "--help":
-		DisplayHelpInfo()
+		DisplayHelpInfo(args)
 	case "version", "--version":
 		DisplayVersionInfo(version)
 	}
 
 }
 
-func DisplayHelpInfo() {
-	fmt.Println("Help is coming...")
+func DisplayHelpInfo(args []string) {
+	if len(args) >= 1 {
+		fmt.Printf("%s\n", helpFor(args[0]))
+	} else {
+		fmt.Println("\n  --help takes a module name as an argument, i.e: '--help github'")
+	}
+
 	os.Exit(0)
 }
 
@@ -30,3 +41,20 @@ func DisplayVersionInfo(version string) {
 	fmt.Printf("Version: %s\n", version)
 	os.Exit(0)
 }
+
+func helpFor(moduleName string) string {
+	switch moduleName {
+	case "git":
+		return git.HelpText
+	case "github":
+		return github.HelpText
+	case "textfile":
+		return textfile.HelpText
+	case "todo":
+		return todo.HelpText
+	case "weather":
+		return weather.HelpText
+	default:
+		return fmt.Sprintf("\n  There is no help available for '%s'", moduleName)
+	}
+}