Add specs for previous versions of golang

1 files changed, 15 insertions, 3 deletions

diff --git a/lib/license/finder/ext/go_modules.rb b/lib/license/finder/ext/go_modules.rb
index 5102740..defdbe4 100644
--- a/lib/license/finder/ext/go_modules.rb
+++ b/lib/license/finder/ext/go_modules.rb
@@ -9,9 +9,7 @@ module LicenseFinder
     end
 
     def current_packages
-      stdout, _stderr, status = shell.execute([
-        :go, :list, '-f', "'{{.Path}},{{.Version}},{{.Dir}}'", '-m', :all
-      ])
+      stdout, _stderr, status = shell.execute(command_for_current_version)
       return [] unless status.success?
 
       stdout.lines.map do |line|
@@ -25,6 +23,20 @@ module LicenseFinder
 
     private
 
+    def command_for_current_version
+      format = "'{{.Path}},{{.Version}},{{.Dir}}'"
+      case go_version
+      when '1.11', '1.12', '1.13'
+        [:go, :list, '-m', '-mod=vendor', '-f', format, :all]
+      else
+        [:go, :list, '-f', format, '-m', :all]
+      end
+    end
+
+    def go_version
+      `go version`.scan(/\sgo(?<version>\d\.\d{1,2})\s/)
+    end
+
     def absolute_project_path
       @absolute_project_path ||= Pathname(project_path).cleanpath
     end