Added function to retrieve tools path

Author: cmaglie

tools.go

@@ -0,0 +1,38 @@
+// fwuploader-plugin-helper
+// Copyright (c) 2023 Arduino LLC.  All right reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package helper
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/arduino/go-paths-helper"
+	semver "go.bug.st/relaxed-semver"
+)
+
+// FindToolPath retrieve the path to the given tool, if available, otherwise returns an error
+func FindToolPath(toolName string, toolVersion *semver.Version) (*paths.Path, error) {
+	appPath, err := paths.New(os.Args[0]).Abs()
+	if err != nil {
+		return nil, err
+	}
+	toolPath := appPath.Parent().Join(toolName, toolVersion.String())
+	if !appPath.IsDir() {
+		return nil, fmt.Errorf("tool not found: %s@%s", toolName, toolVersion)
+	}
+	return toolPath, nil
+}