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6.3 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.