Add makemigrations override command

django_migration_linter/management/commands/makemigrations.py

@@ -0,0 +1,70 @@
+import os
+
+from django.conf import settings
+from django.core.management.commands.makemigrations import (
+    Command as MakeMigrationsCommand,
+)
+from django.db.migrations.writer import MigrationWriter
+
+from django_migration_linter import MigrationLinter
+
+from ..utils import register_linting_configuration_options
+
+
+class Command(MakeMigrationsCommand):
+    help = "Creates new migration(s) for apps and lints them."
+
+    def add_arguments(self, parser):
+        super(Command, self).add_arguments(parser)
+        parser.add_argument(
+            "--lint", action="store_true", help="Lint newly generated migrations.",
+        )
+        register_linting_configuration_options(parser)
+
+    def handle(self, *app_labels, **options):
+        self.lint = options["lint"]
+        self.database = options["database"]
+        self.exclude_migrations_tests = options["exclude_migration_tests"]
+        self.warnings_as_errors = options["warnings_as_errors"]
+        return super(Command, self).handle(*app_labels, **options)
+
+    def write_migration_files(self, changes):
+        super(Command, self).write_migration_files(changes)
+        if (
+            not getattr(settings, "MIGRATION_LINTER_OVERRIDE_MAKEMIGRATIONS", False)
+            and not self.lint
+        ):
+            return
+
+        # Lint migrations
+        linter = MigrationLinter(
+            path=os.environ["DJANGO_SETTINGS_MODULE"],
+            database=self.database,
+            no_cache=True,
+            exclude_migration_tests=self.exclude_migrations_tests,
+            warnings_as_errors=self.warnings_as_errors,
+        )
+
+        for app_label, app_migrations in changes.items():
+            if self.verbosity >= 1:
+                self.stdout.write(
+                    self.style.MIGRATE_HEADING("Linting for '%s':" % app_label) + "\n"
+                )
+            for migration in app_migrations:
+                linter.lint_migration(migration)
+                if linter.has_errors:
+                    writer = MigrationWriter(migration)
+                    os.remove(writer.path)
+
+                    if self.verbosity >= 1:
+                        try:
+                            migration_string = os.path.relpath(writer.path)
+                        except ValueError:
+                            migration_string = writer.path
+                        if migration_string.startswith(".."):
+                            migration_string = writer.path
+                        self.stdout.write(
+                            "Deleted %s\n"
+                            % (self.style.MIGRATE_LABEL(migration_string))
+                        )
+                linter.reset_counters()