Jujutsu/git integration

The editor now has a button to commit changes to a Jujutsu repository,
which is automatically created if it's not present.

A git remote is automatically set up using the URL template in
settings.py. I use this with Forgejo's create-on-push feature to
automatically create repositories on my Forgejo instance.

thinks/models.py

@@ -3,6 +3,8 @@ from django.db import models
 from django.urls import reverse
 from django.utils.timezone import datetime, make_aware
 
+from .jujutsu import JJController
+
 THINKS_DIR = settings.THINKS_DIR
 
 # Create your models here.
@@ -21,6 +23,13 @@ class Think(models.Model):
     def root(self):
         return (THINKS_DIR / self.slug).resolve()
 
+    @property
+    def jj_controller(self):
+        return JJController(self)
+
+    def has_jj(self):
+        return (self.root / '.jj').exists()
+
     def get_absolute_url(self):
         return reverse('think', kwargs={'slug': self.slug})