Add command to only check migration files in a given file

django_migration_linter/management/commands/lintmigrations.py

@@ -25,6 +25,15 @@ class Command(BaseCommand):
                 "the initial repo commit will be used"
             ),
         )
+        parser.add_argument(
+            "--include-migrations-in-file",
+            metavar="FILE_PATH",
+            type=str,
+            nargs="?",
+            help=(
+                "if specified, only migrations inside the file " "will be considered",
+            ),
+        )
         parser.add_argument(
             "--ignore-name-contains",
             type=str,
@@ -122,7 +131,10 @@ class Command(BaseCommand):
             only_unapplied_migrations=options["unapplied_migrations"],
             exclude_migration_tests=options["exclude_migration_tests"],
         )
-        linter.lint_all_migrations(git_commit_id=options["commit_id"])
+        linter.lint_all_migrations(
+            git_commit_id=options["commit_id"],
+            migrations_file_path=options["include_migrations_in_file"],
+        )
         linter.print_summary()
         if linter.has_errors:
             sys.exit(1)

django_migration_linter/migration_linter.py

@@ -85,10 +85,12 @@ class MigrationLinter(object):
     def should_use_cache(self):
         return self.django_path and not self.no_cache
 
-    def lint_all_migrations(self, git_commit_id=None):
+    def lint_all_migrations(self, git_commit_id=None, migrations_file_path=None):
         # Collect migrations
         if git_commit_id:
             migrations = self._gather_migrations_git(git_commit_id)
+        elif migrations_file_path:
+            migrations = self._gather_migrations_from_file(migrations_file_path)
         else:
             migrations = self._gather_all_migrations()
 
@@ -248,6 +250,23 @@ class MigrationLinter(object):
             raise Exception("Error while executing git diff command")
         return migrations
 
+    def _gather_migrations_from_file(self, migrations_file_path):
+        from django.db.migrations.loader import MIGRATIONS_MODULE_NAME
+
+        migrations = []
+
+        with open(migrations_file_path, "r") as f:
+            lines = f.read()
+            for line in lines:
+                if (
+                    re.search(r"/{0}/.*\.py".format(MIGRATIONS_MODULE_NAME), line)
+                    and "__init__" not in line
+                ):
+                    app_label, name = split_migration_path(line)
+                    migration = self.migration_loader.disk_migrations[app_label, name]
+                    migrations.append(migration)
+        return migrations
+
     def _gather_all_migrations(self):
         # Prune Django apps
         for (app_label, _), migration in self.migration_loader.disk_migrations.items():