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author | Eli Zaretskii <eliz@gnu.org> | 2023-04-01 12:49:18 +0300 |
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committer | Eli Zaretskii <eliz@gnu.org> | 2023-04-01 12:49:18 +0300 |
commit | d1d39a0f09c272a8bdea54ecd13f560bbd8264eb (patch) | |
tree | ada0a337b2b2007176e72808eb0784a3e2c7b7c7 /doc | |
parent | 46209b2453b1a53fcf0019f6e1a21b7fef85bcbc (diff) | |
download | emacs-d1d39a0f09c272a8bdea54ecd13f560bbd8264eb.tar.gz |
Document enhancements in handling of echo-area messages
* etc/NEWS:
* doc/lispref/display.texi (Displaying Messages):
* lisp/minibuffer.el (inhibit-message-regexps)
(set-message-functions, inhibit-message, set-multi-message):
Improve the documentation of functions dealing with display of
echo-area messages.
Diffstat (limited to 'doc')
-rw-r--r-- | doc/lispref/display.texi | 74 |
1 files changed, 57 insertions, 17 deletions
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi index 550d711c73a..85fac4b30a6 100644 --- a/doc/lispref/display.texi +++ b/doc/lispref/display.texi @@ -310,29 +310,29 @@ reformatted, with undesirable results. Instead, use @code{(message "%s" @var{string})}. @end defun +The following facilities allow users and Lisp programs to control how +echo-area messages are displayed. + @defvar set-message-function If this variable is non-@code{nil}, it should be a function of one -argument, the text of a message to display in the echo area. This +argument, the text of a message to display in the echo area. That function will be called by @code{message} and related functions. If the function returns @code{nil}, the message is displayed in the echo -area as usual. If this function returns a string, that string is -displayed in the echo area instead of the original one. If this -function returns other non-@code{nil} values, that means the message -was already handled, so @code{message} will not display anything in -the echo area. See also @code{clear-message-function} that can be -used to clear the message displayed by this function. - -The default value is the function that displays the message at the end -of the minibuffer when the minibuffer is active. However, if the text -shown in the active minibuffer has the @code{minibuffer-message} text -property (@pxref{Special Properties}) on some character, the message -will be displayed before the first character having that property. +area as usual. If the function returns a string, that string is +displayed in the echo area @emph{instead} of the original message. If +the function returns any other non-@code{nil} value, that means the +message was already handled, so @code{message} will not display +anything in the echo area. + +The default value calls @code{set-minibuffer-message}, described +below. @end defvar @defvar clear-message-function -If this variable is non-@code{nil}, @code{message} and related -functions call it with no arguments when their argument message is -@code{nil} or the empty string. +If this variable is non-@code{nil}, it should be a function of no +arguments; @code{message} and related functions call it when their +argument message is @code{nil} or the empty string, to clear the echo +area. Usually this function is called when the next input event arrives after displaying an echo-area message. The function is expected to @@ -358,11 +358,51 @@ with the same text; if the last function in the list returns function returns a non-@code{nil} value that is not a string, the message is considered to be handled, and no further functions in the list are called. + +The three useful functions to be put in the list that is the value of +this option are described below. @end defopt +@defun set-minibuffer-message message +This function displays @var{message} in the echo-area when the +minibuffer is not active, and at the end of the minibuffer when the +minibuffer is active. However, if the text shown in the active +minibuffer has the @code{minibuffer-message} text property +(@pxref{Special Properties}) on some character, the message will be +displayed before the first character having that property. + +This function is by default the only member of the list in +@code{set-message-functions}. +@end defun + +@vindex inhibit-message-regexps +@defun inhibit-message message +If an echo-area @var{message} matches any regexp in the list that is +the value of the user option @code{inhibit-message-regexps}, this +function suppresses the display of that message and returns a +non-@code{nil} value that is not a string. Thus, if this function is +in the list @code{set-message-functions}, the rest of the functions in +the list will not be called when @var{message} matches the regexps in +@code{inhibit-message-regexps}. To ensure a matching @var{message} +will never be displayed, make this function be the first element of +the list in @code{set-message-functions}. +@end defun + +@vindex multi-message-max +@vindex multi-message-timeout +@defun set-multi-message message +This function accumulates several echo-area messages emitted one after +another, and returns them as a single string in which individual +messages are separated by newlines. Up to @code{multi-message-max} +recent messages can be accumulated. The accumulated messages are +discarded when more than @code{multi-message-timeout} seconds have +elapsed since the time the first message was emitted. +@end defun + @defvar inhibit-message When this variable is non-@code{nil}, @code{message} and related functions -will not use the Echo Area to display messages. +will not display any messages in the Echo Area. Echo-area messages +are still logged in the @file{*Messages*} buffer, though. @end defvar @defmac with-temp-message message &rest body |