Add script to report rules

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

Author: AyanSinhaMahapatra

etc/scripts/licenses/report_license_rules.py

@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# ScanCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/nexB/scancode-toolkit for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+import io
+
+import click
+import csv
+
+from licensedcode.models import load_licenses
+from licensedcode.models import load_rules
+
+@click.command()
+@click.argument('csv_file', type=click.Path(), metavar='FILE', help='The CSV filename where the licenses/rules will be written.')
+@click.option('-l', '--licenses', is_flag=True, default=False, conflicting_options=['rules'], help='Include Licenses in the CSV output.')
+@click.option('-r', '--rules', is_flag=True, default=False, conflicting_options=['licenses'], help='Include Rules in the CSV output.')
+@click.option('-c', '--category', type=str, default=None, help='An optional filter to only output licenses/rules of this category. Example: `permissive`.')
+@click.option('-e', '--license-expression', type=str, default=None, help='An optional filter to only output licenses/rules which has this license-expression. Example: `mit`.')
+@click.help_option('-h', '--help')
+def cli(csv_file, licenses, rules, type, license_expression):
+    """
+    Write Licenses/Rules from scancode into a CSV file with all details.
+    Output can be optionally filtered by category/license-expression.
+    """
+    output = []
+
+    licenses_data = load_licenses()
+
+    if licenses:
+        for license in licenses_data.values():
+            output.append(license.to_dict())
+
+    if rules:
+        rules_data = list(load_rules())
+        for rule in rules_data:
+            rule_data = rule.to_dict()
+            rule_data['category'] = licenses_data[rule_data['license_expression']].category
+            output.append(rule_data)
+      
+    print()
+
+    with open(csv_file,'w',encoding='utf-8-sig',newline='') as f:
+        w = csv.DictWriter(f,fieldnames=output[0].keys())
+        w.writeheader()
+
+    for entry in output:
+        w.writerow(entry)
+
+
+if __name__ == '__main__':
+    cli()