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Improve documentation of 'with-help-window'

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* doc/lispref/help.texi (Help Functions): Change variable name
to 'buffer-or-name'.

* lisp/help.el (with-help-window): Change variable name to
'buffer-or-name' and rewrite the doc string, adding reference
to 'help-window-setup'.  (Bug#30792)
This commit is contained in:
Nick Helm 2018-03-18 21:05:44 +13:00 • committed by Eli Zaretskii
parent ec08c62f03
commit 2fb52abd9e
2 changed files with 19 additions and 19 deletions
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19
doc/lispref/help.texi
View file

@ -744,16 +744,17 @@ This function returns the name of the help buffer, which is normally
@end defun
@vindex help-window-select
@defmac with-help-window buffer-name body@dots{}
@defmac with-help-window buffer-or-name body@dots{}
This macro evaluates @var{body} like @code{with-output-to-temp-buffer}
(@pxref{Temporary Displays}), inserting any output produced by its forms
into a buffer named @var{buffer-name}. (Usually, @var{buffer-name}
should be the value returned by the function @code{help-buffer}.) It
also puts the specified buffer into Help mode and displays a message
telling the user how to quit and scroll the help window. It selects the
help window if the current value of the user option
@code{help-window-select} has been set accordingly. It returns the last
value in @var{body}.
(@pxref{Temporary Displays}), inserting any output produced by its
forms into a buffer specified by @var{buffer-or-name}, which can be a
buffer or the name of a buffer. (Frequently, @var{buffer-or-name} is
the value returned by the function @code{help-buffer}.) This macro
puts the specified buffer into Help mode and displays a message
telling the user how to quit and scroll the help window. It selects
the help window if the current value of the user option
@code{help-window-select} has been set accordingly. It returns the
last value in @var{body}.
@end defmac
@defun help-setup-xref item interactive-p

19
lisp/help.el
View file

@ -1370,15 +1370,14 @@ Return VALUE."
;; (4) A marker (`help-window-point-marker') to move point in the help
;; window to an arbitrary buffer position.
(defmacro with-help-window (buffer-name &rest body)
"Display buffer named BUFFER-NAME in a help window.
Evaluate the forms in BODY with standard output bound to a buffer
called BUFFER-NAME (creating it if it does not exist), put that
buffer in `help-mode', display the buffer in a window (see
`with-temp-buffer-window' for details) and issue a message how to
deal with that \"help\" window when it's no more needed. Select
the help window if the current value of the user option
`help-window-select' says so. Return last value in BODY."
(defmacro with-help-window (buffer-or-name &rest body)
"Evaluate BODY, send output to BUFFER-OR-NAME and show in a help window.
This construct is like `with-temp-buffer-window' but unlike that
puts the buffer specified by BUFFER-OR-NAME in `help-mode' and
displays a message about how to delete the help window when it's no
longer needed. The help window will be selected if
`help-window-select' is non-nil. See `help-window-setup' for
more options."
(declare (indent 1) (debug t))
`(progn
;; Make `help-window-point-marker' point nowhere. The only place
@ -1390,7 +1389,7 @@ the help window if the current value of the user option
(cons 'help-mode-finish temp-buffer-window-show-hook)))
(setq help-window-old-frame (selected-frame))
(with-temp-buffer-window
,buffer-name nil 'help-window-setup (progn ,@body)))))
,buffer-or-name nil 'help-window-setup (progn ,@body)))))
;; Called from C, on encountering `help-char' when reading a char.
;; Don't print to *Help*; that would clobber Help history.