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;;; slime-autodoc.el --- show fancy arglist in echo area
;;
;; Authors: Luke Gorrie <luke@bluetail.com>
;; Lawrence Mitchell <wence@gmx.li>
;; Matthias Koeppe <mkoeppe@mail.math.uni-magdeburg.de>
;; Tobias C. Rittweiler <tcr@freebits.de>
;; and others
;;
;; License: GNU GPL (same license as Emacs)
;;
;;; Installation:
;;
;; Add this to your .emacs:
;;
;; (add-to-list 'load-path "<directory-of-this-file>")
;; (add-hook 'slime-load-hook (lambda () (require 'slime-autodoc)))
;;
(require 'slime-parse)
(defvar slime-use-autodoc-mode t
"When non-nil always enable slime-autodoc-mode in slime-mode.")
(defun slime-fontify-string (string)
"Fontify STRING as `font-lock-mode' does in Lisp mode."
(with-current-buffer (get-buffer-create " *slime-fontify*")
(erase-buffer)
(if (not (eq major-mode 'lisp-mode))
(lisp-mode))
(insert string)
(let ((font-lock-verbose nil))
(font-lock-fontify-buffer))
(goto-char (point-min))
(when (re-search-forward "===> \\(\\(.\\|\n\\)*\\) <===" nil t)
(let ((highlight (match-string 1)))
;; Can't use (replace-match highlight) here -- broken in Emacs 21
(delete-region (match-beginning 0) (match-end 0))
(slime-insert-propertized '(face highlight) highlight)))
(buffer-substring (point-min) (point-max))))
(defun slime-arglist (name)
"Show the argument list for NAME."
(interactive (list (slime-read-symbol-name "Arglist of: ")))
(slime-eval-async
`(swank:arglist-for-echo-area (quote (,name)))
(lambda (arglist)
(if arglist
(message "%s" (slime-fontify-string arglist))
(error "Arglist not available")))))
;;;; Autodocs (automatic context-sensitive help)
(defvar slime-autodoc-mode nil
"*When non-nil, print documentation about symbols as the point moves.")
(defvar slime-autodoc-cache-type 'last
"*Cache policy for automatically fetched documentation.
Possible values are:
nil - none.
last - cache only the most recently-looked-at symbol's documentation.
The values are stored in the variable `slime-autodoc-cache'.
More caching means fewer calls to the Lisp process, but at the risk of
using outdated information.")
(defvar slime-autodoc-cache nil
"Cache variable for when `slime-autodoc-cache-type' is 'last'.
The value is (SYMBOL-NAME . DOCUMENTATION).")
(defun slime-autodoc-mode (&optional arg)
"Enable `slime-autodoc'."
(interactive "P")
(cond ((< (prefix-numeric-value arg) 0) (setq slime-autodoc-mode nil))
(arg (setq slime-autodoc-mode t))
(t (setq slime-autodoc-mode (not slime-autodoc-mode))))
(if slime-autodoc-mode
(progn
(slime-autodoc-start-timer)
(add-hook 'pre-command-hook
'slime-autodoc-pre-command-refresh-echo-area t))
(slime-autodoc-stop-timer)))
(defvar slime-autodoc-last-message "")
(defun slime-autodoc ()
"Print some apropos information about the code at point, if applicable."
(destructuring-bind (cache-key retrieve-form) (slime-autodoc-thing-at-point)
(let ((cached (slime-get-cached-autodoc cache-key)))
(if cached
(slime-autodoc-message cached)
;; Asynchronously fetch, cache, and display documentation
(slime-eval-async
retrieve-form
(with-lexical-bindings (cache-key)
(lambda (doc)
(let ((doc (if doc (slime-fontify-string doc) "")))
(slime-update-autodoc-cache cache-key doc)
(slime-autodoc-message doc)))))))))
(defcustom slime-autodoc-use-multiline-p nil
"If non-nil, allow long autodoc messages to resize echo area display."
:type 'boolean
:group 'slime-ui)
(defvar slime-autodoc-message-function 'slime-autodoc-show-message)
(defun slime-autodoc-message (doc)
"Display the autodoc documentation string DOC."
(funcall slime-autodoc-message-function doc))
(defun slime-autodoc-show-message (doc)
(unless slime-autodoc-use-multiline-p
(setq doc (slime-oneliner doc)))
(setq slime-autodoc-last-message doc)
(message "%s" doc))
(defvar slime-autodoc-dimensions-function nil)
(defun slime-autodoc-message-dimensions ()
"Return the available width and height for pretty printing autodoc
messages."
(cond
(slime-autodoc-dimensions-function
(funcall slime-autodoc-dimensions-function))
(slime-autodoc-use-multiline-p
;; Use the full width of the minibuffer;
;; minibuffer will grow vertically if necessary
(values (window-width (minibuffer-window))
nil))
(t
;; Try to fit everything in one line; we cut off when displaying
(values 1000 1))))
(defun slime-autodoc-pre-command-refresh-echo-area ()
(unless (string= slime-autodoc-last-message "")
(if (slime-autodoc-message-ok-p)
(message "%s" slime-autodoc-last-message)
(setq slime-autodoc-last-message ""))))
(defun slime-autodoc-thing-at-point ()
"Return a cache key and a swank form."
(let ((global (slime-autodoc-global-at-point)))
(if global
(values (slime-qualify-cl-symbol-name global)
`(swank:variable-desc-for-echo-area ,global))
(multiple-value-bind (operators arg-indices points)
(slime-enclosing-form-specs)
(values (mapcar* (lambda (designator arg-index)
(cons
(if (symbolp designator)
(slime-qualify-cl-symbol-name designator)
designator)
arg-index))
operators arg-indices)
(multiple-value-bind (width height)
(slime-autodoc-message-dimensions)
`(swank:arglist-for-echo-area ',operators
:arg-indices ',arg-indices
:print-right-margin ,width
:print-lines ,height)))))))
(defun slime-autodoc-global-at-point ()
"Return the global variable name at point, if any."
(when-let (name (slime-symbol-name-at-point))
(if (slime-global-variable-name-p name) name)))
(defcustom slime-global-variable-name-regexp "^\\(.*:\\)?\\([*+]\\).+\\2$"
"Regexp used to check if a symbol name is a global variable.
Default value assumes +this+ or *that* naming conventions."
:type 'regexp
:group 'slime)
(defun slime-global-variable-name-p (name)
"Is NAME a global variable?
Globals are recognised purely by *this-naming-convention*."
(and (< (length name) 80) ; avoid overflows in regexp matcher
(string-match slime-global-variable-name-regexp name)))
(defun slime-get-cached-autodoc (symbol-name)
"Return the cached autodoc documentation for SYMBOL-NAME, or nil."
(ecase slime-autodoc-cache-type
((nil) nil)
((last)
(when (equal (car slime-autodoc-cache) symbol-name)
(cdr slime-autodoc-cache)))
((all)
(when-let (symbol (intern-soft symbol-name))
(get symbol 'slime-autodoc-cache)))))
(defun slime-update-autodoc-cache (symbol-name documentation)
"Update the autodoc cache for SYMBOL with DOCUMENTATION.
Return DOCUMENTATION."
(ecase slime-autodoc-cache-type
((nil) nil)
((last)
(setq slime-autodoc-cache (cons symbol-name documentation)))
((all)
(put (intern symbol-name) 'slime-autodoc-cache documentation)))
documentation)
;;;;; Asynchronous message idle timer
(defvar slime-autodoc-idle-timer nil
"Idle timer for the next autodoc message.")
(defvar slime-autodoc-delay 0.2
"*Delay before autodoc messages are fetched and displayed, in seconds.")
(defun slime-autodoc-start-timer ()
"(Re)start the timer that prints autodocs every `slime-autodoc-delay' seconds."
(interactive)
(when slime-autodoc-idle-timer
(cancel-timer slime-autodoc-idle-timer))
(setq slime-autodoc-idle-timer
(run-with-idle-timer slime-autodoc-delay slime-autodoc-delay
'slime-autodoc-timer-hook)))
(defun slime-autodoc-stop-timer ()
"Stop the timer that prints autodocs.
See also `slime-autodoc-start-timer'."
(when slime-autodoc-idle-timer
(cancel-timer slime-autodoc-idle-timer)
(setq slime-autodoc-idle-timer nil)))
(defun slime-autodoc-timer-hook ()
"Function to be called after each Emacs becomes idle.
When `slime-autodoc-mode' is non-nil, print apropos information about
the symbol at point if applicable."
(when (slime-autodoc-message-ok-p)
(condition-case err
(slime-autodoc)
(error
(setq slime-autodoc-mode nil)
(message "Error: %S; slime-autodoc-mode now disabled." err)))))
(defun slime-autodoc-message-ok-p ()
"Return true if printing a message is currently okay (shouldn't
annoy the user)."
(and (or slime-mode (eq major-mode 'slime-repl-mode)
(eq major-mode 'sldb-mode))
slime-autodoc-mode
(or (null (current-message))
(string= (current-message) slime-autodoc-last-message))
(not executing-kbd-macro)
(not (and (boundp 'edebug-active) (symbol-value 'edebug-active)))
(not cursor-in-echo-area)
(not (active-minibuffer-window))
(not (eq (selected-window) (minibuffer-window)))
(slime-background-activities-enabled-p)))
;;; Initialization
(defun slime-autodoc-init ()
(setq slime-echo-arglist-function 'slime-autodoc)
(dolist (h '(slime-mode-hook slime-repl-mode-hook sldb-mode-hook))
(add-hook h 'slime-autodoc-maybe-enable)))
(defun slime-autodoc-maybe-enable ()
(when slime-use-autodoc-mode
(slime-autodoc-mode 1)))
(defun slime-autodoc-unload ()
(setq slime-echo-arglist-function 'slime-show-arglist)
(dolist (h '(slime-mode-hook slime-repl-mode-hook sldb-mode-hook))
(remove-hook h 'slime-autodoc-maybe-enable)))
(slime-require :swank-arglists)
(provide 'slime-autodoc)
|
