Commit bd9df9c

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Command stores the information for running a command
+type Command struct {
+	Command     string
+	Description string
+	Run         func(args []string) error
+}
+
+// selectCommand takes a string and converts it to the correct command
+func selectCommand(str string) (Command, error) {
+	for _, value := range commandArray {
+		if strings.Compare(value.Command, str) == 0 {
+			return value, nil
+		}
+	}
+	return Command{}, fmt.Errorf("No command found for: %s", str)
+}
+
+// commandArray contains the full list of commands available to the application
+// note that subcommands are not currently supported
+var commandArray = []Command{Command{Command: "test",
+	Description: "Execute a test. Given a number, will go through a test with [n] questions. Type 'exit' to stop test.",
+	Run:         executeTest},
+	Command{Command: "score",
+		Description: "Display the score for the user.",
+		Run: func(args []string) error {
+			fmt.Print("score was run.")
+			return nil
+		}},
+	Command{Command: "exit",
+		Description: "Exit the self-assessment application and close the connection.",
+		Run: func(args []string) error {
+			fmt.Print("Exiting application.\n")
+			os.Exit(0)
+			return nil
+		}}}
+
+// helpCommand prints the help for the list of available commands.
+// it cannot exist in the initialization due to initialization loops
+var helpCommand = Command{Command: "help",
+	Description: "Display help for all known commands.",
+	Run: func(args []string) error {
+		for _, command := range commandArray {
+			fmt.Printf("%s\n\t%s\n", command.Command, command.Description)
+		}
+		return nil
+	}}
+
+// init initializes the commandArray to provide a single interface
+func init() {
+	commandArray = append(commandArray, helpCommand)
+}
+
+// executeTest runs a user through a test
+func executeTest(args []string) error {
+	client := &http.Client{}
+	var record Record
+	var err error
+	var input string
+	questions := 20
+	if len(args) > 0 {
+		questions, err = strconv.Atoi(args[0])
+		if err != nil {
+			return fmt.Errorf("Error while converting to number: %+v", err)
+		}
+	}
+	reader := bufio.NewReader(os.Stdin)
+	for i := 0; i < questions; i += 1 {
+		record, err = getRecordFromServer(client, config)
+		if err != nil {
+			return fmt.Errorf("Error while request from server: %+v", err)
+		}
+		fmt.Printf("%d) %s\n", i+1, record.Question)
+		input, _ = reader.ReadString('\n')
+		if strings.Compare(strings.TrimSpace(input), record.Answer) == 0 {
+			fmt.Println("Correct.")
+		} else if strings.Compare(strings.TrimSpace(input), "exit") == 0 {
+			return nil
+		} else {
+			fmt.Printf("Incorrect. Correct answer was: %s\n", record.Answer)
+		}
+	}
+	return nil
+}