Atomic Sexp Widgets
The atoms are s-expressions
that do not consist of other s-expressions. For example, a
string, a file name, or a symbol are atoms, while a list is a
composite type. You can edit the value of an atom with the
following widgets.
The syntax for all the atoms are:
type ::= (construct [keyword argument]... [ value ])
The value, if present, is used to initialize the
:value property and must be an expression of the
same type as the widget. That is, the string widget can only be
initialized with a string.
All the atom widgets take the same keyword arguments as the
editable-field widget. See editable-field.
— Widget:
string
Allows you to edit a string in an editable field.
— Widget:
regexp
Allows you to edit a regular expression in an editable
field.
— Widget:
character
Allows you to enter a character in an editable field.
— Widget:
file
Allows you to edit a file name in an editable field.
Keywords:
:must-match- If this is set to non-
nil, only existing
file names will be allowed in the minibuffer.
— Widget:
directory
Allows you to edit a directory name in an editable field.
Similar to the file widget.
— Widget:
symbol
Allows you to edit a Lisp symbol in an editable field.
— Widget:
function
Allows you to edit a lambda expression, or a function name
with completion.
— Widget:
variable
Allows you to edit a variable name, with completion.
— Widget:
integer
Allows you to edit an integer in an editable field.
— Widget:
number
Allows you to edit a number in an editable field.
— Widget:
boolean
Allows you to edit a boolean. In Lisp this means a
variable which is either nil meaning false, or
non-nil meaning true.