wip(installer): stub experimental "installer"

Stubs out an experimental "installer" that will help new users to
quickly configure `cheat`.

internal/installer/clone.go

@@ -0,0 +1,24 @@
+package installer
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+const cloneURL = "https://github.com/cheat/cheatsheets.git"
+
+// Clone clones the community cheatsheets
+func Clone(path string) error {
+
+	// perform the clone in a shell
+	cmd := exec.Command("git", "clone", cloneURL, path)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("failed to clone cheatsheets: %v", err)
+	}
+
+	return nil
+}

internal/installer/installer.go

@@ -0,0 +1 @@
+package installer

internal/installer/prompt.go

@@ -0,0 +1,37 @@
+package installer
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// Prompt prompts the user for a answer
+func Prompt(prompt string, def bool) (bool, error) {
+
+	// initialize a line reader
+	reader := bufio.NewReader(os.Stdin)
+
+	// display the prompt
+	fmt.Print(fmt.Sprintf("%s: ", prompt))
+
+	// read the answer
+	ans, err := reader.ReadString('\n')
+	if err != nil {
+		return false, fmt.Errorf("failed to parse input: %v", err)
+	}
+
+	// normalize the answer
+	ans = strings.ToLower(strings.TrimRight(ans, "\n"))
+
+	// return the appropriate response
+	switch ans {
+	case "y":
+		return true, nil
+	case "":
+		return def, nil
+	default:
+		return false, nil
+	}
+}