The most basic primitive for minibuffer input is
read-from-minibuffer, which can be used to read either a string
or a Lisp object in textual form. The function
used for reading regular expressions (see Regular Expressions),
which are a special kind of string. There are also specialized
functions for reading commands, variables, file names, etc.
In most cases, you should not call minibuffer input functions in the
middle of a Lisp function. Instead, do all minibuffer input as part of
reading the arguments for a command, in the
specification. See Defining Commands.
read-from-minibufferprompt &optional initial keymap read history default inherit-input-method
This function is the most general way to get input from the
minibuffer. By default, it accepts arbitrary text and returns it as a
string; however, if read is non-
nil, then it uses
read to convert the text into a Lisp object (see Input Functions).
The first thing this function does is to activate a minibuffer and display it with prompt (which must be a string) as the prompt. Then the user can edit text in the minibuffer.
When the user types a command to exit the minibuffer,
read-from-minibuffer constructs the return value from the text in
the minibuffer. Normally it returns a string containing that text.
However, if read is non-
reads the text and returns the resulting Lisp object, unevaluated.
(See Input Functions, for information about reading.)
The argument default specifies default values to make available
through the history commands. It should be a string, a list of
nil. The string or strings become the minibuffer’s
“future history”, available to the user with M-n.
If read is non-
nil, then default is also used
as the input to
read, if the user enters empty input.
If default is a list of strings, the first string is used as the input.
If default is
nil, empty input results in an
However, in the usual case (where read is
read-from-minibuffer ignores default when the user enters
empty input and returns an empty string,
"". In this respect,
it differs from all the other minibuffer input functions in this chapter.
If keymap is non-
nil, that keymap is the local keymap to
use in the minibuffer. If keymap is omitted or
value of minibuffer-local-map is used as the keymap. Specifying
a keymap is the most important way to customize the minibuffer for
various applications such as completion.
The argument history specifies a history list variable to use for saving the input and for history commands used in the minibuffer. It defaults to minibuffer-history. You can optionally specify a starting position in the history list as well. See Minibuffer History.
If the variable minibuffer-allow-text-properties is
nil, then the string that is returned includes whatever text
properties were present in the minibuffer. Otherwise all the text
properties are stripped when the value is returned.
If the argument inherit-input-method is non-
nil, then the
minibuffer inherits the current input method (see Input Methods) and
the setting of enable-multibyte-characters (see Text Representations) from whichever buffer was current before entering the
Use of initial is mostly deprecated; we recommend using
nil value only in conjunction with specifying a cons cell
for history. See Initial Input.
read-stringprompt &optional initial history default inherit-input-method
This function reads a string from the minibuffer and returns it. The
arguments prompt, initial, history and
inherit-input-method are used as in
The keymap used is minibuffer-local-map.
The optional argument default is used as in
read-from-minibuffer, except that, if non-
nil, it also
specifies a default value to return if the user enters null input. As
read-from-minibuffer it should be a string, a list of
nil, which is equivalent to an empty string. When
default is a string, that string is the default value. When it
is a list of strings, the first string is the default value. (All
these strings are available to the user in the “future minibuffer
This function works by calling the
(read-string prompt initial history default inherit) ≡ (let ((value (read-from-minibuffer prompt initial nil nil history default inherit))) (if (and (equal value "") default) (if (consp default) (car default) default) value))
read-regexpprompt &optional defaults history
This function reads a regular expression as a string from the minibuffer and returns it. If the minibuffer prompt string prompt does not end in ‘:’ (followed by optional whitespace), the function adds ‘: ’ to the end, preceded by the default return value (see below), if that is non-empty.
The optional argument defaults controls the default value to
return if the user enters null input, and should be one of: a string;
nil, which is equivalent to an empty string; a list of strings;
or a symbol.
If defaults is a symbol,
read-regexp consults the value
of the variable read-regexp-defaults-function (see below), and
if that is non-
nil uses it in preference to defaults.
The value in this case should be either:
regexp-history-last, which means to use the first element of the appropriate minibuffer history list (see below).
nil, a string, or a list of strings) becomes the value of defaults.
read-regexp now ensures that the result of processing
defaults is a list (i.e., if the value is
nil or a
string, it converts it to a list of one element). To this list,
read-regexp then appends a few potentially useful candidates for
input. These are:
The function now has a list of regular expressions that it passes to
read-from-minibuffer to obtain the user’s input. The first
element of the list is the default result in case of empty input. All
elements of the list are available to the user as the “future
minibuffer history” list (see future list in The GNU Emacs Manual).
The optional argument history, if non-
nil, is a symbol
specifying a minibuffer history list to use (see Minibuffer History). If it is omitted or
nil, the history list defaults
read-regexp may use the value of this variable to
determine its list of default regular expressions. If non-
the value of this variable should be either:
nil, a string, or a list of strings.
read-regexp above for details of how these values are used.
If this variable is
read-string strip all text properties from the minibuffer
input before returning it. However,
read-no-blanks-input (see below), as well as
read-minibuffer and related functions (see Reading Lisp Objects With the Minibuffer), and all
functions that do minibuffer input with completion, discard text
properties unconditionally, regardless of the value of this variable.
This is the default local keymap for reading from the minibuffer. By default, it makes the following bindings:
read-no-blanks-inputprompt &optional initial inherit-input-method
This function reads a string from the minibuffer, but does not allow
whitespace characters as part of the input: instead, those characters
terminate the input. The arguments prompt, initial, and
inherit-input-method are used as in
This is a simplified interface to the
function, and passes the value of the minibuffer-local-ns-map
keymap as the keymap argument for that function. Since the keymap
minibuffer-local-ns-map does not rebind C-q, it is
possible to put a space into the string, by quoting it.
This function discards text properties, regardless of the value of minibuffer-allow-text-properties.
(read-no-blanks-input prompt initial) ≡ (let (minibuffer-allow-text-properties) (read-from-minibuffer prompt initial minibuffer-local-ns-map))
This built-in variable is the keymap used as the minibuffer local keymap
in the function
read-no-blanks-input. By default, it makes the
following bindings, in addition to those of minibuffer-local-map: