Add basic CSV export for other distro comparisons

Add the ability to export the comparison search results to CSV format in
order to allow importing the data into external tools.

Note: I implemented this in a different way than the earlier recipe CSV
export, i.e. it uses a template to render the CSV instead of a
function-based view with the Python csv module - the reason for this is
we can reuse the same view as we use for producing the search, with all
of the flexibility that gives us.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

layerindex/templatetags/extrafilters.py

@@ -0,0 +1,12 @@
+from django import template
+from .. import utils
+
+register = template.Library()
+
+@register.filter
+def replace_commas(string):
+    return string.replace(',', '_')
+
+@register.filter
+def squashspaces(strval):
+    return utils.squashspaces(strval)

layerindex/urls.py

@@ -142,6 +142,12 @@ urlpatterns = [
         ClassicRecipeSearchView.as_view(
             template_name='layerindex/classicrecipes.html'),
             name='comparison_recipe_search'),
+    url(r'^comparison/search-csv/(?P<branch>[-\w]+)/$',
+        ClassicRecipeSearchView.as_view(
+            template_name='layerindex/classicrecipes_csv.txt',
+            paginate_by=0,
+            content_type='text/csv'),
+            name='comparison_recipe_search_csv'),
     url(r'^comparison/stats/(?P<branch>[-\w]+)/$',
         ClassicRecipeStatsView.as_view(
             template_name='layerindex/classicstats.html'),

layerindex/utils.py

@@ -14,6 +14,7 @@ import time
 import fcntl
 import signal
 import codecs
+import re
 from bs4 import BeautifulSoup
 
 def get_branch(branchname):
@@ -430,3 +431,5 @@ def sanitise_html(html):
 
     return soup.renderContents()
 
+def squashspaces(string):
+    return re.sub("\s+", " ", string).strip()

templates/layerindex/classicrecipes.html

@@ -123,6 +123,7 @@
                             </tbody>
                         </table>
                          <button class="btn" type="submit">Search</button>
+                         <button class="btn" type="submit" formaction="{% url 'comparison_recipe_search_csv' branch.name %}">Export CSV</button>
                     </form>
                 </div>
 

templates/layerindex/classicrecipes_csv.txt

@@ -0,0 +1,2 @@
+{% load extrafilters %}{% for recipe in recipe_list %}{{ recipe.name }},{{ recipe.layerbranch.layer.name }},{{ recipe.short_desc|replace_commas|squashspaces }},{{ recipe.section }},{% if recipe.cover_recipe %}{{ recipe.cover_recipe.get_cover_status_display }}{% endif %},{% if recipe.cover_recipe %}{{ recipe.cover_recipe.pn }}{% endif %}
+{% endfor %}