From 84a34c89e7b79dfcca509bbc3ef7aafd10fdaa5f Mon Sep 17 00:00:00 2001
From: Danielle McLean <dani@00dani.me>
Date: Wed, 25 Oct 2017 00:25:41 +1100
Subject: [PATCH] Enable breadcrumb support, use it on the login view

---
 home/views.py                                     |  3 +++
 lemonauth/views.py                                |  3 +++
 lemoncurry/breadcrumbs.py                         | 15 +++++++++++++++
 lemoncurry/static/lemoncurry/css/layout.styl      | 13 ++++++++++---
 lemoncurry/templates/lemoncurry/layout.html       |  3 +++
 .../templates/lemoncurry/tags/breadcrumbs.html    | 14 ++++++++++++++
 lemoncurry/templatetags/lemoncurry_tags.py        |  9 +++++++++
 7 files changed, 57 insertions(+), 3 deletions(-)
 create mode 100644 lemoncurry/breadcrumbs.py
 create mode 100644 lemoncurry/templates/lemoncurry/tags/breadcrumbs.html

diff --git a/home/views.py b/home/views.py
index 9bc157c..e2060b3 100644
--- a/home/views.py
+++ b/home/views.py
@@ -1,5 +1,8 @@
 from django.shortcuts import get_object_or_404, render
 from users.models import User
+from lemoncurry import breadcrumbs
+
+breadcrumbs.add('home:index', 'home')
 
 
 def index(request):
diff --git a/lemonauth/views.py b/lemonauth/views.py
index d2cd871..fd03dac 100644
--- a/lemonauth/views.py
+++ b/lemonauth/views.py
@@ -1,4 +1,7 @@
 from django.contrib.auth import views as auth_views
+from lemoncurry import breadcrumbs
+
+breadcrumbs.add(route='lemonauth:login', label='login', parent='home:index')
 
 login = auth_views.LoginView.as_view(
     template_name='lemonauth/login.html',
diff --git a/lemoncurry/breadcrumbs.py b/lemoncurry/breadcrumbs.py
new file mode 100644
index 0000000..d71e6ba
--- /dev/null
+++ b/lemoncurry/breadcrumbs.py
@@ -0,0 +1,15 @@
+breadcrumbs = {}
+
+
+def add(route, label, parent=None):
+    breadcrumbs[route] = {'label': label, 'route': route, 'parent': parent}
+
+
+def find(route):
+    crumbs = []
+    while route:
+        crumb = breadcrumbs[route]
+        crumbs.append(crumb)
+        route = crumb['parent']
+    crumbs.reverse()
+    return crumbs
diff --git a/lemoncurry/static/lemoncurry/css/layout.styl b/lemoncurry/static/lemoncurry/css/layout.styl
index 7bff2c8..331a527 100644
--- a/lemoncurry/static/lemoncurry/css/layout.styl
+++ b/lemoncurry/static/lemoncurry/css/layout.styl
@@ -20,9 +20,16 @@ body
 	background-color $base00
 	color $base07
 	> header
-		background-color $base01
-		#navbar
-			justify-content space-between
+		> .navbar
+			background-color $base01
+			#navbar
+				justify-content space-between
+		> .breadcrumbs
+			background-color $base02
+			> .breadcrumb
+				background-color transparent
+				border-radius 0
+
 
 	> main
 		margin 2rem
diff --git a/lemoncurry/templates/lemoncurry/layout.html b/lemoncurry/templates/lemoncurry/layout.html
index cb7ba3d..a94cd9d 100644
--- a/lemoncurry/templates/lemoncurry/layout.html
+++ b/lemoncurry/templates/lemoncurry/layout.html
@@ -29,6 +29,9 @@
 					{% nav_right request %}
 				</div>
 			</nav>
+			{% if request.resolver_match.view_name %}
+			{% nav_crumbs request.resolver_match.view_name %}
+			{% endif %}
 		</header>
 
 		<main>
diff --git a/lemoncurry/templates/lemoncurry/tags/breadcrumbs.html b/lemoncurry/templates/lemoncurry/tags/breadcrumbs.html
new file mode 100644
index 0000000..607bcc1
--- /dev/null
+++ b/lemoncurry/templates/lemoncurry/tags/breadcrumbs.html
@@ -0,0 +1,14 @@
+{% if crumbs %}
+<nav class="breadcrumbs" aria-label="breadcrumb" role="navigation">
+	<ol class="breadcrumb">
+		{% for crumb in crumbs %}
+		<li class="breadcrumb-item">
+			<a href="{% url crumb.route %}">{{ crumb.label }}</a>
+		</li>
+		{% endfor %}
+		<li class="breadcrumb-item active" aria-current="page">
+			{{ current.label }}
+		</li>
+	</ol>
+</nav>
+{% endif %}
diff --git a/lemoncurry/templatetags/lemoncurry_tags.py b/lemoncurry/templatetags/lemoncurry_tags.py
index 1d8b9d2..ced1b21 100644
--- a/lemoncurry/templatetags/lemoncurry_tags.py
+++ b/lemoncurry/templatetags/lemoncurry_tags.py
@@ -7,6 +7,8 @@ from django import template
 from django.conf import settings
 from django.urls import reverse
 
+from .. import breadcrumbs
+
 register = template.Library()
 cache = SimpleNamespace(package_json=None)
 
@@ -50,3 +52,10 @@ def nav_right(request):
             MenuItem(label='log in', icon='fa fa-sign-in', url='lemonauth:login'),
         )
     return {'items': items}
+
+
+@register.inclusion_tag('lemoncurry/tags/breadcrumbs.html')
+def nav_crumbs(route):
+    crumbs = breadcrumbs.find(route)
+    current = crumbs.pop()
+    return {'crumbs': crumbs, 'current': current}