Add a WTForms-compatible textbox macro

This macro:
- accepts a WTForm form field as a parameter
- renders a form field which follows the GOV.UK Elements patterns, both visually
  and in markup terms

It then changes any page which uses either:
- the old, non-WTForms macro or
- the old, WTFforms `render_field` macro

…to use this new macro and removes both of the old ones.

It also adds the option to display hint text above the textbox.

app/main/views/service_settings.py

@@ -2,6 +2,7 @@ from flask import render_template, redirect, request, url_for, abort
 from flask_login import login_required
 
 from app.main import main
+from app.main.forms import ConfirmPasswordForm, ServiceNameForm
 
 service = {
     'name': 'Service name',
@@ -20,10 +21,15 @@ def service_settings():
 
 @main.route("/service-settings/name", methods=['GET', 'POST'])
 def name():
+
+    form = ServiceNameForm()
+    form.service_name.data = 'Service name'
+
     if request.method == 'GET':
         return render_template(
             'views/service-settings/name.html',
-            service=service
+            service=service,
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.confirm_name_change'))
@@ -31,10 +37,14 @@ def name():
 
 @main.route("/service-settings/name/confirm", methods=['GET', 'POST'])
 def confirm_name_change():
+
+    form = ConfirmPasswordForm()
+
     if request.method == 'GET':
         return render_template(
             'views/service-settings/confirm.html',
-            heading='Change your service name'
+            heading='Change your service name',
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.service_settings'))
@@ -64,11 +74,15 @@ def status():
 
 @main.route("/service-settings/status/confirm", methods=['GET', 'POST'])
 def confirm_status_change():
+
+    form = ConfirmPasswordForm()
+
     if request.method == 'GET':
         return render_template(
             'views/service-settings/confirm.html',
             heading='Turn off all outgoing notifications',
-            destructive=True
+            destructive=True,
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.service_settings'))
@@ -87,11 +101,15 @@ def delete():
 
 @main.route("/service-settings/delete/confirm", methods=['GET', 'POST'])
 def confirm_delete():
+
+    form = ConfirmPasswordForm()
+
     if request.method == 'GET':
         return render_template(
             'views/service-settings/confirm.html',
             heading='Delete this service from Notify',
-            destructive=True
+            destructive=True,
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.dashboard'))

app/main/views/styleguide.py

@@ -1,7 +1,24 @@
 from flask import render_template
+from flask_wtf import Form
+from wtforms import StringField, PasswordField, TextAreaField, validators
 from app.main import main
 
 
 @main.route('/_styleguide')
 def styleguide():
-    return render_template('views/styleguide.html')
+
+    class FormExamples(Form):
+        username = StringField(u'Username')
+        password = PasswordField(u'Password', [validators.required()])
+        message = TextAreaField(u'Message')
+
+    form = FormExamples()
+
+    form.message.data = "Your vehicle tax for ((registration number)) is due on ((date)). Renew online at www.gov.uk/vehicle-tax"  # noqa
+
+    form.validate()
+
+    return render_template(
+        'views/styleguide.html',
+        form=form
+    )

app/main/views/templates.py

@@ -1,6 +1,7 @@
 from flask import request, render_template, redirect, url_for
 
 from app.main import main
+from app.main.forms import TemplateForm
 
 
 @main.route("/templates")
@@ -10,12 +11,17 @@ def manage_templates():
 
 @main.route("/templates/template", methods=['GET', 'POST'])
 def add_template():
+
+    form = TemplateForm()
+
+    form.template_name.data = 'Reminder'
+    form.template_body.data = 'Vehicle tax: Your vehicle tax for ((registration number)) expires on ((date)). Tax your vehicle at www.gov.uk/vehicle-tax'  # noqa
+
     if request.method == 'GET':
         return render_template(
             'views/edit-template.html',
-            template_name='Reminder',
-            template_body='Vehicle tax: Your vehicle tax for ((registration number)) expires on ((date)). Tax your vehicle at www.gov.uk/vehicle-tax',  # noqa
-            h1='Edit template'
+            h1='Edit template',
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.manage_templates'))
@@ -23,10 +29,14 @@ def add_template():
 
 @main.route("/templates/template/add", methods=['GET', 'POST'])
 def edit_template():
+
+    form = TemplateForm()
+
     if request.method == 'GET':
         return render_template(
             'views/edit-template.html',
-            h1='Add template'
+            h1='Add template',
+            form=form
         )
     elif request.method == 'POST':
         return redirect(url_for('.manage_templates'))