Add ability to edit publish date

If a date is not set, default to “0101-01-01”

cps/db.py

@@ -230,6 +230,8 @@ class Data(Base):
 class Books(Base):
     __tablename__ = 'books'
 
+    DEFAULT_PUBDATE = "0101-01-01"
+
     id = Column(Integer, primary_key=True)
     title = Column(String)
     sort = Column(String)

cps/templates/book_edit.html

@@ -52,6 +52,10 @@
         <input type="text" class="form-control" name="cover_url" id="cover_url" value="">
       </div>
 
+    <div class="form-group">
+      <label for="pubdate">{{_('Published')}}</label>
+      <input type="date" class="form-control" name="pubdate" id="pubdate" value="{% if book.pubdate %}{{book.pubdate|formatdateinput}}{% endif %}">
+    </div>
     <div class="form-group">
       <label for="languages">{{_('Language')}}</label>
       <input type="text" class="form-control typeahead" name="languages" id="languages" value="{% for language in book.languages %}{{language.language_name.strip()}}, {% endfor %}">

cps/web.py

@@ -415,6 +415,14 @@ def formatdate(val):
     return format_date(formatdate, format='medium', locale=get_locale())
 
 
+@app.template_filter('formatdateinput')
+def format_date_input(val):
+    conformed_timestamp = re.sub(r"[:]|([-](?!((\d{2}[:]\d{2})|(\d{4}))$))", '', val)
+    date_obj = datetime.datetime.strptime(conformed_timestamp[:15], "%Y%m%d %H%M%S")
+    input_date = date_obj.isoformat().split('T', 1)[0] # Hack to support dates <1900
+    return '' if input_date == "0101-01-01" else input_date
+
+
 @app.template_filter('strftime')
 def timestamptodate(date, fmt=None):
     date = datetime.datetime.fromtimestamp(
@@ -2763,6 +2771,14 @@ def edit_book(book_id):
     input_languages = to_save["languages"].split(',')
     input_languages = map(lambda it: it.strip().lower(), input_languages)
 
+    if to_save["pubdate"]:
+        try:
+            book.pubdate = datetime.datetime.strptime(to_save["pubdate"], "%Y-%m-%d")
+        except ValueError:
+            book.pubdate = db.Books.DEFAULT_PUBDATE
+    else:
+        book.pubdate = db.Books.DEFAULT_PUBDATE
+
     # retranslate displayed text to language codes
     languages = db.session.query(db.Languages).all()
     input_l = []