Parse lockfile when available

1 files changed, 12 insertions, 2 deletions

diff --git a/lib/license/finder/ext/composer.rb b/lib/license/finder/ext/composer.rb
index e6b0733..1be4e2b 100644
--- a/lib/license/finder/ext/composer.rb
+++ b/lib/license/finder/ext/composer.rb
@@ -45,9 +45,12 @@ module LicenseFinder
         :licenses,
         '--format=json'
       ], env: default_env)
-      return [] unless status.success?
+      return from_lockfile unless status.success?
 
-      JSON.parse(stdout).fetch('dependencies', {}).map do |name, data|
+      dependencies = JSON.parse(stdout).fetch('dependencies', {})
+      return from_lockfile if dependencies.empty?
+
+      dependencies.map do |name, data|
         data.merge('name' => name) if data.is_a?(Hash)
       end.compact
     end
@@ -72,5 +75,12 @@ module LicenseFinder
       ], env: default_env)
       status.success? ? stdout.split(' ').last : ''
     end
+
+    def from_lockfile
+      return [] unless lockfile_path.exist?
+
+      json = JSON.parse(lockfile_path.read)
+      json.fetch('packages', [])
+    end
   end
 end