Add control code preview generation

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/control_codes/migrations/0001_initial.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.22 on 2019-09-01 08:20
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+import mayan.apps.common.validators
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ControlSheet',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('label', models.CharField(max_length=196, unique=True, verbose_name='Label')),
+            ],
+            options={
+                'ordering': ('label',),
+                'verbose_name': 'Control sheet',
+                'verbose_name_plural': 'Control sheets',
+            },
+        ),
+        migrations.CreateModel(
+            name='ControlSheetCode',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('order', models.PositiveIntegerField(blank=True, db_index=True, default=0, help_text='Order in which the transformations will be executed. If left unchanged, an automatic order value will be assigned.', verbose_name='Order')),
+                ('name', models.CharField(choices=[('test', 'Test: argument_1')], max_length=128, verbose_name='Name')),
+                ('arguments', models.TextField(blank=True, help_text='Enter the arguments for the control code as a YAML dictionary.', validators=[mayan.apps.common.validators.YAMLValidator()], verbose_name='Arguments')),
+                ('enabled', models.BooleanField(default=True, verbose_name='Enabled')),
+                ('control_sheet', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='codes', to='control_codes.ControlSheet', verbose_name='Control sheet')),
+            ],
+            options={
+                'verbose_name': 'Control sheet code',
+                'verbose_name_plural': 'Control sheet codes',
+            },
+        ),
+    ]