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"""
Outputs a graphviz dot file of the dependencies.
"""
from __future__ import print_function
from optparse import make_option
import re
import textwrap
from django.core.management.base import BaseCommand
from django.core.management.color import no_style
from south.migration import Migrations, all_migrations
class Command(BaseCommand):
help = "Outputs a GraphViz dot file of all migration dependencies to stdout."
def handle(self, **options):
# Resolve dependencies
Migrations.calculate_dependencies()
colors = [ 'crimson', 'darkgreen', 'darkgoldenrod', 'navy',
'brown', 'darkorange', 'aquamarine' , 'blueviolet' ]
color_index = 0
wrapper = textwrap.TextWrapper(width=40)
print("digraph G {")
# Group each app in a subgraph
for migrations in all_migrations():
print(" subgraph %s {" % migrations.app_label())
print(" node [color=%s];" % colors[color_index])
for migration in migrations:
# Munge the label - text wrap and change _ to spaces
label = "%s - %s" % (
migration.app_label(), migration.name())
label = re.sub(r"_+", " ", label)
label= "\\n".join(wrapper.wrap(label))
print(' "%s.%s" [label="%s"];' % (
migration.app_label(), migration.name(), label))
print(" }")
color_index = (color_index + 1) % len(colors)
# For every migration, print its links.
for migrations in all_migrations():
for migration in migrations:
for other in migration.dependencies:
# Added weight tends to keep migrations from the same app
# in vertical alignment
attrs = "[weight=2.0]"
# But the more interesting edges are those between apps
if other.app_label() != migration.app_label():
attrs = "[style=bold]"
print(' "%s.%s" -> "%s.%s" %s;' % (
other.app_label(), other.name(),
migration.app_label(), migration.name(),
attrs
))
print("}");
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