support for replace-name@

[drzraf]

When creating a form blueprint, the name matters. For example header.some.thing.
That makes impossible to reuse named fields.

Let's say a plugin defines such a foobar field:

# blueprints.yaml
form:
  validation: strict
  fields:
   foobar:
      type: select
      label: Default value if not overriden per-page
      data-options@: '\Grav\Plugin\MyPlugin::foobar'

But such value can be override on a page basis. The best is to reuse already defined blueprint:

# blueprints/modular/form.yaml
form:
  fields:
    # importing blueprint admin fields for per-page override
    import@:
      type: blueprints.yaml:form/fields # <-- this syntax is horribly difficult to deduce and undocumented
      context: plugins://myplugin

    # and override
    enabled: { unset@: true } # sure, this is not needed

    # `foobar` is not ok, in this context we must use `header.form.foobar`
    foobar:
      replace-name@: true
      name: header.form.foobar

See also: #23

[drzraf]

ping