Create plugin for following reference files

Signed-off-by: akugarg <[email protected]>

Author: akugarg

src/licensedcode/plugin_license.py

@@ -10,7 +10,9 @@
 from functools import partial
 
 import attr
+import os
 
+from commoncode import fileutils
 from commoncode.cliutils import PluggableCommandLineOption
 from plugincode.scan import ScanPlugin
 from plugincode.scan import scan_impl
@@ -116,3 +118,54 @@ def get_scanner(
             license_text_diagnostics=license_text_diagnostics,
             license_url_template=license_url_template
         )
+    def process_codebase(self, codebase, **kwargs):
+
+        for resource in codebase.walk(topdown=False):
+            match_reference_license(resource,codebase)
+
+
+def match_reference_license(resource, codebase):
+    """
+    Find instances for any licenses in referenced filenames
+    """
+    licenses = resource.licenses
+    license_expressions = resource.license_expressions
+    if not licenses:
+        return 
+
+    location = resource.location
+    
+    from licensedcode import cache
+    from scancode.api import get_licenses
+    idx = cache.get_index()
+    matches = idx.match(
+        location=location, min_score=0)
+    
+    modified = False
+
+    for match in matches:
+        ref_files=match.rule.referenced_filenames
+        if len(ref_files) != 0:
+            for i in range(len(ref_files)):
+                if not ref_files[i].startswith('usr/share/common-licenses'):
+                 new_loc=find_reference_file(location,ref_files[i])
+                 if new_loc != None:
+                   new_lic=get_licenses(new_loc, min_score=0)
+                   licenses.extend(new_lic['licenses'])
+                   license_expressions.extend(new_lic['license_expressions'])
+                   modified = True
+
+    if modified:
+        codebase.save_resource(resource)
+    return resource
+
+def find_reference_file(location,referenced_filename):
+    file_name=referenced_filename
+    par_dir=fileutils.parent_directory(location)
+
+    for root, dirs, files in os.walk(par_dir):
+      if file_name in files:
+         path_file = os.path.join(root,file_name)
+         return path_file
+        
+    return None