The label toolbar uses fields in the attribute table of vector layers to fine tune labeling (Data defined labeling). That's the main reason i'm looking for that, but it may have more applications.

I'd like to automatically add some format columns instead of adding them manually every time. 

Do you know a plugin or a way to do this manipulation automatically on multiples layers ?

I tried to get the QGIS tool "Add a field to attribute table" into a quick model which works properly, but it creates a new memory layer. And I'd like just new fields.

```
##Add_ETIKT_Field=name
##myvlayer=vector
##myvlayer=output vector
outputs_QGISADDFIELDTOATTRIBUTESTABLE_2=processing.runalg('qgis:addfieldtoattributestable', myvlayer,'ETIKT_Y',1,15.0,4.0,None)
outputs_QGISADDFIELDTOATTRIBUTESTABLE_1=processing.runalg('qgis:addfieldtoattributestable', outputs_QGISADDFIELDTOATTRIBUTESTABLE_2['OUTPUT_LAYER'],'ETIKT_X',1,15.0,5.0,myvlayer)

```

What I'm looking to automate is :

* Open the attribute table
* Edit button
* Field Calculator button
* Add Column + Type + length + Precision

It seems there's some ideas in [QGIS manual](http://docs.qgis.org/2.14/en/docs/pyqgis_developer_cookbook/vector.html#adding-and-removing-fields), but I'd love to avoid coding anything, or at least at minimum go through the modeler.

> 
> **Adding and Removing Fields** 
> 
> 
> To add fields (attributes), you need to
>  specify a list of field definitions. For deletion of fields just
>  provide a list of field indexes.
> 
> 
> 

```
if caps & QgsVectorDataProvider.AddAttributes:
    res = layer.dataProvider().addAttributes([QgsField("mytext", QVariant.String), QgsField("myint", QVariant.Int)])

if caps & QgsVectorDataProvider.DeleteAttributes:
    res = layer.dataProvider().deleteAttributes([0])

```