#83 on the way

installer.go

@@ -0,0 +1,98 @@
+package hugo
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"runtime/debug"
+
+	"github.com/mitchellh/go-homedir"
+)
+
+// This is automatically set on `go generate`
+const version = "UNDEFINED"
+
+// GetPath retrives the Hugo path for the user or install it if it's not found
+func getPath() string {
+	homedir, err := homedir.Dir()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+
+	caddy := filepath.Join(homedir, ".caddy")
+	bin := filepath.Join(caddy, "bin")
+	hugo := ""
+	found := false
+
+	// Check if Hugo is already on $PATH
+	if hugo, err = exec.LookPath("hugo"); err == nil {
+		if checkVersion(hugo) {
+			return hugo
+		}
+
+		found = true
+	}
+
+	if !found {
+		hugo = filepath.Join(bin, "hugo")
+
+		if runtime.GOOS == "windows" {
+			hugo += ".exe"
+		}
+
+		// Check if Hugo is on $HOME/.caddy/bin
+		if _, err = os.Stat(hugo); err == nil {
+			if checkVersion(hugo) {
+				return hugo
+			}
+
+			found = true
+		}
+	}
+
+	if found {
+		fmt.Println("We will update your hugo to the newest version.")
+	} else {
+		fmt.Println("Unable to find Hugo on your computer.")
+	}
+
+	// Create the neccessary folders
+	os.MkdirAll(caddy, 0774)
+	os.Mkdir(bin, 0774)
+
+	binary, err := Asset("hugo")
+
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+
+	err = ioutil.WriteFile(hugo, binary, 0644)
+
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+
+	binary = nil
+
+	// Force memory RAM garbage collector
+	debug.FreeOSMemory()
+
+	fmt.Println("Hugo installed at " + hugo)
+	return hugo
+}
+
+func checkVersion(hugo string) bool {
+	out, _ := exec.Command(hugo, "version").Output()
+
+	r := regexp.MustCompile(`v\d\.\d{2}`)
+	v := r.FindStringSubmatch(string(out))[0]
+
+	return (v == version)
+}