Check i2p running status before attempting to start the router

Makefile

@@ -2,7 +2,7 @@
 
 GO111MODULE=on
 
-VERSION=0.0.07
+VERSION=0.0.12
 USER_GH=eyedeekay
 
 version:

checki2cp.go

@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"os/exec"
 	"os/user"
 	"runtime"
 	"strings"
@@ -198,3 +199,37 @@ func FindI2PIsInstalledDefaultLocation() (string, error) {
 	}
 	return "", fmt.Errorf("i2p router not found.")
 }
+
+func ConditionallyLaunchI2P() (bool, error) {
+	ok, err := CheckI2PIsInstalledDefaultLocation()
+	if err != nil {
+		return false, err
+	}
+	if ok {
+		if ok, err := CheckI2PIsRunning(); err == nil {
+			if !ok {
+				path, err := FindI2PIsInstalledDefaultLocation()
+				if err != nil {
+					return false, err
+				}
+				if strings.HasSuffix(path, "i2prouter") {
+					cmd := exec.Command(path, "start")
+					if err := cmd.Start(); err != nil {
+						return false, fmt.Errorf("I2P router startup failure", err)
+					}
+				} else {
+					cmd := exec.Command(path, "--daemon")
+					if err := cmd.Start(); err != nil {
+						return false, fmt.Errorf("I2P router startup failure", err)
+					}
+				}
+				return true, nil
+			}
+			return true, nil
+		} else {
+			return false, err
+		}
+	} else {
+		return false, fmt.Errorf("I2P is not a default location, please set $I2P environment variable")
+	}
+}