Merged a number of pull requests and fixed issues (#63)

* Make media on AdminPagedownWidget lazy

This avoids resolving static files on import which may fail if
static files are not in manifest when using ManifestStaticFilesStorage.

* Include super media in AdminPagedownWidget media property

* Lazily handle media for Django 1.10+

* Cleaned up comments

* Cleaned up comments

* Address #60

* Fix HTML Preview Label

* Update the example code to support Django2.0

example/app/music/models.py

@@ -11,12 +11,12 @@ class Album(models.Model):
     '''A music album.'''
     name = models.CharField(max_length=128)
     description = models.TextField(blank=True)
-    artist = models.ForeignKey(Artist)
+    artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
 
 
 class Song(models.Model):
     '''A music song.'''
     name = models.CharField(max_length=128)
     description = models.TextField(blank=True)
     lyrics = models.TextField(blank=True)
-    album = models.ForeignKey(Album)
+    album = models.ForeignKey(Album, on_delete=models.CASCADE)

example/requirements.txt

@@ -1,5 +1,5 @@
 appdirs==1.4.3
-Django==1.11
+Django==2.0
 django-pagedown==0.1.3
 packaging==16.8
 pyparsing==2.2.0

pagedown/static/admin/css/pagedown.css

@@ -24,6 +24,7 @@
 
 .wmd-preview-title {
     margin: 10px 0 5px 0 !important;
+    padding-left: 0px !important;
 }
 
 .wmd-preview{
@@ -78,6 +79,8 @@
 
 .wmd-preview p{
     margin: 0 0 15px;
+    margin-left: 0 !important;
+    padding-left: 0 !important;
 }
 
 .wmd-preview img{

pagedown/utils.py

@@ -1,12 +1,17 @@
+from django import VERSION
 from django.conf import settings
 
 
 def compatible_staticpath(path):
     '''
     Try to return a path to static the static files compatible all
-    the way back to Django 1.2. If anyone has a cleaner or better 
+    the way back to Django 1.2. If anyone has a cleaner or better
     way to do this let me know!
     '''
+    if VERSION >= (1, 10):
+        # Since Django 1.10, forms.Media automatically invoke static
+        # lazily on the path if it is relative.
+        return path
     try:
         # >= 1.4
         from django.templatetags.static import static

pagedown/widgets.py

@@ -1,20 +1,23 @@
 from django import VERSION, forms
 from django.contrib.admin import widgets as admin_widgets
+from django.utils.html import conditional_escape
+from django.template import Context, loader
+
+# Django 1.7 compatibility
 try:
     from django.forms.utils import flatatt
 except ImportError:
-    from django.forms.util import flatatt # <1.7
-from django.utils.html import conditional_escape
-from django.template import Context, loader
+    from django.forms.util import flatatt
 
 from pagedown import settings as pagedown_settings
 from pagedown.utils import compatible_staticpath
 
 
+# Python 3 compatibility
+# https://docs.djangoproject.com/en/1.5/topics/python3/#string-handling
 try:
     from django.utils.encoding import force_unicode
-except ImportError:  # python3
-    # https://docs.djangoproject.com/en/1.5/topics/python3/#string-handling
+except ImportError:
     from django.utils.encoding import force_text as force_unicode
 
 
@@ -53,7 +56,7 @@ def render(self, name, value, attrs=None):
             final_attrs["class"] = ""
         final_attrs["class"] += " wmd-input"
         template = loader.get_template(self.template)
-        
+
         # Compatibility fix:
         # see https://github.com/timmyomahony/django-pagedown/issues/42
         context = {
@@ -67,10 +70,12 @@ def render(self, name, value, attrs=None):
 
 
 class AdminPagedownWidget(PagedownWidget, admin_widgets.AdminTextareaWidget):
-    class Media:
-        css = {
-            "all": (compatible_staticpath("admin/css/pagedown.css"),)
-        }
-        js = (
-            compatible_staticpath("admin/js/pagedown.js"),
-        )
+    def _media(self):
+        return super(AdminPagedownWidget, self).media + forms.Media(
+            css={
+                "all": (compatible_staticpath("admin/css/pagedown.css"),)
+            },
+            js=(
+                compatible_staticpath("admin/js/pagedown.js"),
+            ))
+    media = property(_media)