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Assorted useful flask views, blueprints, Jinja2 template filters, and templates/macros

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# Flask Extras
Assorted useful flask views, blueprints, Jinja2 template filters, and templates/macros.

## Overall setup

As of `3.4.0`, filters and templates will automatically be registered and available through the following simple command:

from flask_extras import FlaskExtras
app = Flask('myapp')

For the old way, check out [this page](wiki/

## Available features

### Views

Import them like usual:

from flask_extras.views import (

*Note:* each view must have a valid template in your apps templates dir. See each view for the required names and locations.

*Note:* each view has configuration helpers to inject or configure your app. See source for details.

### Macros

**Many more macros** are available. You can use them like so:

{% from 'macros.html' import list_group, objects2table %}

For the most comprehensive docs, check out each [macro](flask_extras/macros/). Comment "docstrings" are inline using jinja2 comments (these are not rendered in your html).

Also, check the source and/or output to see what classes are available for style overrides.

### Statuses

Provides views for common status codes. Usage:

app = statuses.inject_error_views(app)

See source for more.

### Decorators

See the source for more. Usage example:

from flask_extras.decorators import require_headers

def foo():

### Forms

#### WTForm Multi-step wizard

A WTForm extension for handling an arbitrary number of separate forms as a single, multi-step, multi-POST wizard. All state and data are handled by apps' session backend. Building forms is just like you're used to -- simple and intuitive. Just inherit the `MultiStepWizard` class and put a `__forms__` key on it, which is just a list of all the forms you want to use. *Note*: list order matters for your form steps.

Usage example:

from import FlaskForm

from flask_extras.forms.wizard import MultiStepWizard

class MultiStepTest1(FlaskForm):
field1 = StringField(validators=[validators.DataRequired()],)
field2 = IntegerField(validators=[validators.DataRequired()],)

class MultiStepTest2(FlaskForm):
field3 = StringField(validators=[validators.DataRequired()],)
field4 = IntegerField(validators=[validators.DataRequired()],)

class MyCoolForm(MultiStepWizard):
__forms__ = [

and an example route:

from forms import MyCoolForm

@app.route('/', methods=['GET', 'POST'])
def index():
curr_step = request.args.get('curr_step')
form_kwargs = dict(session_key='mycustomkey')
if curr_step is not None:
form = forms.MyCoolForm(**form_kwargs)
kwargs = dict(form=form)
if request.method == 'POST':
if form.validate_on_submit():
if form.is_complete():
data = form.alldata(combine_fields=True, flush_after=True)
flash('Form validated and complete! data = {}'.format(data),
return jsonify(data)
flash('Great job, but not done yet ({} steps remain!).'.format(form.remaining))
flash('Invalid form data.', 'error')
return render_template('index.html', **kwargs)

and an example html page (using the [wtform_form](flask_extras/macros/macros.html) macro also available):

{% if form.is_complete() %}
<span class="well">Complete!</span>
{% else %}
<ul class="list-inline">
{% for step in form.steps %}
{% if step == form.curr_step %}
<strong class="lead label label-info">current {{ step }}</strong>
{% else %}
<a href="{{ url_for('app.index') }}?curr_step={{ step }}">{{ step }}</a>
{% endif %}
{% if not loop.last %}
{% endif %}
{% endfor %}
{{ wtform_form(form,
classes=['form', 'form-horizontal'],
btn_classes=['btn btn-primary', 'btn-lg'],
) }}
{% endif %}

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