Add user_return function

There are also some new generic templates, `shelf/accession_entry.htm`
and `includes/form_errors.htm`, that can be reused in other places
if required.

growlinflask/growlin.py

@@ -165,7 +165,33 @@ def user_borrow():
             form=cform)
     else:    
         return render_template('user/borrow.htm', form=form)
-
+@app.route('/shelf/<borrowid>/return/', methods=['GET', 'POST'] )
+@login_required
+def user_return(borrowid):
+    try:
+        b = Borrowing.get(Borrowing.id == borrowid)
+    except Borrowing.DoesNotExist:
+        flash('Please decide what you want to return')
+        return redirect(url_for('user_shelf'))
+    form = AccessionEntryForm()
+    if form.validate_on_submit():
+        try:
+            current_user.unborrow(b, form.accession.data)
+        except BorrowError, e:
+            flash(e.message)
+    else:
+        if b.user.username == current_user.username:
+            msg = 'Please enter the accession number for "%(title)s"' % {
+                'title': b.copy.item.display_title}
+            return render_template('shelf/accession_entry.htm', 
+                message=msg,
+                form=form,
+                borrowing=b,
+                sumbit_button_text='Return')
+        else:
+            flash('That item was borrowed by %(name)s, not by you!' % {
+                'name': b.user.name})
+    return redirect(url_for('user_shelf'))
 # Admin interface
 class AdminRegistry(BaseView):
     @expose('/')

growlinflask/templates/includes/form_errors.htm

@@ -0,0 +1,10 @@
+{% if error or form.errors%}
+<ul style="color: red">
+  <li>{{error}}</li>
+  {% for field_name, field_errors in form.errors|dictsort if field_errors %}
+    {% for error in field_errors %}
+      <li>{{error}}</li>
+    {% endfor %}
+  {% endfor %}
+</ul>
+{% endif %}

growlinflask/templates/shelf/accession_entry.htm

@@ -0,0 +1,11 @@
+{% extends 'base.htm' %}
+{% block content %}
+<form action="{{url_for('user_return', borrowid=borrowing.id)}}" method="POST">
+{% include 'includes/form_errors.htm' %}
+{{form.csrf_token}}  
+<p>{{message}}</p>
+{{form.accession}}
+<a href="{{ return_url if return_url else url_for('user_shelf') }}">Back</a>
+<input type="submit" value="{{ submit_button_text if submit_button_text else 'OK' }}" />
+</form>
+{% endblock %}