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1 | ;;; nadvice.el --- Light-weight advice primitives for Elisp functions -*- lexical-binding: t -*- |
2 | ||
09b8afb6 | 3 | ;; Copyright (C) 2012-2013 Free Software Foundation, Inc. |
231d8498 SM |
4 | |
5 | ;; Author: Stefan Monnier <monnier@iro.umontreal.ca> | |
6 | ;; Keywords: extensions, lisp, tools | |
7 | ;; Package: emacs | |
8 | ||
9 | ;; This program is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation, either version 3 of the License, or | |
12 | ;; (at your option) any later version. | |
13 | ||
14 | ;; This program is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | ||
22 | ;;; Commentary: | |
23 | ||
24 | ;; This package lets you add behavior (which we call "piece of advice") to | |
25 | ;; existing functions, like the old `advice.el' package, but with much fewer | |
8725b746 | 26 | ;; bells and whistles. It comes in 2 parts: |
231d8498 SM |
27 | ;; |
28 | ;; - The first part lets you add/remove functions, similarly to | |
29 | ;; add/remove-hook, from any "place" (i.e. as accepted by `setf') that | |
30 | ;; holds a function. | |
31 | ;; This part provides mainly 2 macros: `add-function' and `remove-function'. | |
32 | ;; | |
a77b8d5e | 33 | ;; - The second part provides `advice-add' and `advice-remove' which are |
231d8498 SM |
34 | ;; refined version of the previous macros specially tailored for the case |
35 | ;; where the place that we want to modify is a `symbol-function'. | |
36 | ||
37 | ;;; Code: | |
38 | ||
39 | ;;;; Lightweight advice/hook | |
40 | (defvar advice--where-alist | |
41 | '((:around "\300\301\302\003#\207" 5) | |
42 | (:before "\300\301\002\"\210\300\302\002\"\207" 4) | |
43 | (:after "\300\302\002\"\300\301\003\"\210\207" 5) | |
bcd7a0a4 | 44 | (:override "\300\301\ 2\"\207" 4) |
231d8498 SM |
45 | (:after-until "\300\302\002\"\206\013\000\300\301\002\"\207" 4) |
46 | (:after-while "\300\302\002\"\205\013\000\300\301\002\"\207" 4) | |
47 | (:before-until "\300\301\002\"\206\013\000\300\302\002\"\207" 4) | |
d36ed1c8 SM |
48 | (:before-while "\300\301\002\"\205\013\000\300\302\002\"\207" 4) |
49 | (:filter-args "\300\302\301\ 3!\"\207" 5) | |
50 | (:filter-return "\301\300\302\ 3\"!\207" 5)) | |
231d8498 SM |
51 | "List of descriptions of how to add a function. |
52 | Each element has the form (WHERE BYTECODE STACK) where: | |
53 | WHERE is a keyword indicating where the function is added. | |
54 | BYTECODE is the corresponding byte-code that will be used. | |
55 | STACK is the amount of stack space needed by the byte-code.") | |
56 | ||
57 | (defvar advice--bytecodes (mapcar #'cadr advice--where-alist)) | |
58 | ||
59 | (defun advice--p (object) | |
60 | (and (byte-code-function-p object) | |
61 | (eq 128 (aref object 0)) | |
62 | (memq (length object) '(5 6)) | |
63 | (memq (aref object 1) advice--bytecodes) | |
64 | (eq #'apply (aref (aref object 2) 0)))) | |
65 | ||
66 | (defsubst advice--car (f) (aref (aref f 2) 1)) | |
67 | (defsubst advice--cdr (f) (aref (aref f 2) 2)) | |
68 | (defsubst advice--props (f) (aref (aref f 2) 3)) | |
69 | ||
70 | (defun advice--make-docstring (_string function) | |
71 | "Build the raw doc-string of SYMBOL, presumably advised." | |
72 | (let ((flist (indirect-function function)) | |
73 | (docstring nil)) | |
74 | (if (eq 'macro (car-safe flist)) (setq flist (cdr flist))) | |
75 | (while (advice--p flist) | |
76 | (let ((bytecode (aref flist 1)) | |
77 | (where nil)) | |
78 | (dolist (elem advice--where-alist) | |
79 | (if (eq bytecode (cadr elem)) (setq where (car elem)))) | |
80 | (setq docstring | |
81 | (concat | |
82 | docstring | |
83 | (propertize (format "%s advice: " where) | |
84 | 'face 'warning) | |
85 | (let ((fun (advice--car flist))) | |
86 | (if (symbolp fun) (format "`%S'" fun) | |
87 | (let* ((name (cdr (assq 'name (advice--props flist)))) | |
88 | (doc (documentation fun t)) | |
89 | (usage (help-split-fundoc doc function))) | |
90 | (if usage (setq doc (cdr usage))) | |
91 | (if name | |
92 | (if doc | |
93 | (format "%s\n%s" name doc) | |
94 | (format "%s" name)) | |
95 | (or doc "No documentation"))))) | |
96 | "\n"))) | |
97 | (setq flist (advice--cdr flist))) | |
98 | (if docstring (setq docstring (concat docstring "\n"))) | |
99 | (let* ((origdoc (unless (eq function flist) ;Avoid inf-loops. | |
100 | (documentation flist t))) | |
101 | (usage (help-split-fundoc origdoc function))) | |
102 | (setq usage (if (null usage) | |
103 | (let ((arglist (help-function-arglist flist))) | |
104 | (format "%S" (help-make-usage function arglist))) | |
105 | (setq origdoc (cdr usage)) (car usage))) | |
106 | (help-add-fundoc-usage (concat docstring origdoc) usage)))) | |
107 | ||
108 | (defvar advice--docstring | |
109 | ;; Can't eval-when-compile nor use defconst because it then gets pure-copied, | |
110 | ;; which drops the text-properties. | |
111 | ;;(eval-when-compile | |
112 | (propertize "Advised function" | |
113 | 'dynamic-docstring-function #'advice--make-docstring)) ;; ) | |
114 | ||
1668ea90 SM |
115 | (defun advice-eval-interactive-spec (spec) |
116 | "Evaluate the interactive spec SPEC." | |
117 | (cond | |
118 | ((stringp spec) | |
119 | ;; There's no direct access to the C code (in call-interactively) that | |
120 | ;; processes those specs, but that shouldn't stop us, should it? | |
121 | ;; FIXME: Despite appearances, this is not faithful: SPEC and | |
122 | ;; (advice-eval-interactive-spec SPEC) will behave subtly differently w.r.t | |
123 | ;; command-history (and maybe a few other details). | |
124 | (call-interactively `(lambda (&rest args) (interactive ,spec) args))) | |
125 | ;; ((functionp spec) (funcall spec)) | |
126 | (t (eval spec)))) | |
127 | ||
231d8498 | 128 | (defun advice--make-interactive-form (function main) |
231d8498 SM |
129 | ;; TODO: make it so that interactive spec can be a constant which |
130 | ;; dynamically checks the advice--car/cdr to do its job. | |
1668ea90 SM |
131 | ;; For that, advice-eval-interactive-spec needs to be more faithful. |
132 | ;; FIXME: The calls to interactive-form below load autoloaded functions | |
133 | ;; too eagerly. | |
134 | (let ((fspec (cadr (interactive-form function)))) | |
47f01a8a | 135 | (when (eq 'function (car-safe fspec)) ;; Macroexpanded lambda? |
1668ea90 SM |
136 | (setq fspec (nth 1 fspec))) |
137 | (if (functionp fspec) | |
138 | `(funcall ',fspec | |
139 | ',(cadr (interactive-form main))) | |
231d8498 | 140 | (cadr (or (interactive-form function) |
1668ea90 | 141 | (interactive-form main)))))) |
231d8498 SM |
142 | |
143 | (defsubst advice--make-1 (byte-code stack-depth function main props) | |
144 | "Build a function value that adds FUNCTION to MAIN." | |
145 | (let ((adv-sig (gethash main advertised-signature-table)) | |
146 | (advice | |
147 | (apply #'make-byte-code 128 byte-code | |
148 | (vector #'apply function main props) stack-depth | |
149 | advice--docstring | |
150 | (when (or (commandp function) (commandp main)) | |
151 | (list (advice--make-interactive-form | |
152 | function main)))))) | |
153 | (when adv-sig (puthash advice adv-sig advertised-signature-table)) | |
154 | advice)) | |
155 | ||
156 | (defun advice--make (where function main props) | |
157 | "Build a function value that adds FUNCTION to MAIN at WHERE. | |
158 | WHERE is a symbol to select an entry in `advice--where-alist'." | |
159 | (let ((desc (assq where advice--where-alist))) | |
160 | (unless desc (error "Unknown add-function location `%S'" where)) | |
161 | (advice--make-1 (nth 1 desc) (nth 2 desc) | |
162 | function main props))) | |
163 | ||
dabefae5 | 164 | (defun advice--member-p (function name definition) |
231d8498 SM |
165 | (let ((found nil)) |
166 | (while (and (not found) (advice--p definition)) | |
167 | (if (or (equal function (advice--car definition)) | |
dabefae5 SM |
168 | (when name |
169 | (equal name (cdr (assq 'name (advice--props definition)))))) | |
c67c0839 | 170 | (setq found definition) |
231d8498 SM |
171 | (setq definition (advice--cdr definition)))) |
172 | found)) | |
173 | ||
a731fc1b | 174 | (defun advice--tweak (flist tweaker) |
231d8498 | 175 | (if (not (advice--p flist)) |
a731fc1b | 176 | (funcall tweaker nil flist nil) |
231d8498 | 177 | (let ((first (advice--car flist)) |
a731fc1b | 178 | (rest (advice--cdr flist)) |
231d8498 | 179 | (props (advice--props flist))) |
cb9c0a53 SM |
180 | (let ((val (funcall tweaker first rest props))) |
181 | (if val (car val) | |
a731fc1b SM |
182 | (let ((nrest (advice--tweak rest tweaker))) |
183 | (if (eq rest nrest) flist | |
184 | (advice--make-1 (aref flist 1) (aref flist 3) | |
cb9c0a53 | 185 | first nrest props)))))))) |
a731fc1b SM |
186 | |
187 | ;;;###autoload | |
188 | (defun advice--remove-function (flist function) | |
189 | (advice--tweak flist | |
190 | (lambda (first rest props) | |
cb9c0a53 SM |
191 | (cond ((not first) rest) |
192 | ((or (equal function first) | |
a731fc1b | 193 | (equal function (cdr (assq 'name props)))) |
cb9c0a53 | 194 | (list rest)))))) |
231d8498 | 195 | |
a61428c4 SM |
196 | (defvar advice--buffer-local-function-sample nil) |
197 | ||
198 | (defun advice--set-buffer-local (var val) | |
199 | (if (function-equal val advice--buffer-local-function-sample) | |
200 | (kill-local-variable var) | |
201 | (set (make-local-variable var) val))) | |
202 | ||
203 | ;;;###autoload | |
204 | (defun advice--buffer-local (var) | |
205 | "Buffer-local value of VAR, presumed to contain a function." | |
206 | (declare (gv-setter advice--set-buffer-local)) | |
207 | (if (local-variable-p var) (symbol-value var) | |
208 | (setq advice--buffer-local-function-sample | |
209 | (lambda (&rest args) (apply (default-value var) args))))) | |
210 | ||
231d8498 SM |
211 | ;;;###autoload |
212 | (defmacro add-function (where place function &optional props) | |
213 | ;; TODO: | |
231d8498 SM |
214 | ;; - provide some kind of control over ordering. E.g. debug-on-entry, ELP |
215 | ;; and tracing want to stay first. | |
a61428c4 | 216 | ;; - maybe let `where' specify some kind of predicate and use it |
231d8498 | 217 | ;; to implement things like mode-local or eieio-defmethod. |
a61428c4 SM |
218 | ;; Of course, that only makes sense if the predicates of all advices can |
219 | ;; be combined and made more efficient. | |
231d8498 SM |
220 | ;; :before is like a normal add-hook on a normal hook. |
221 | ;; :before-while is like add-hook on run-hook-with-args-until-failure. | |
222 | ;; :before-until is like add-hook on run-hook-with-args-until-success. | |
223 | ;; Same with :after-* but for (add-hook ... 'append). | |
224 | "Add a piece of advice on the function stored at PLACE. | |
225 | FUNCTION describes the code to add. WHERE describes where to add it. | |
226 | WHERE can be explained by showing the resulting new function, as the | |
227 | result of combining FUNCTION and the previous value of PLACE, which we | |
228 | call OLDFUN here: | |
229 | `:before' (lambda (&rest r) (apply FUNCTION r) (apply OLDFUN r)) | |
230 | `:after' (lambda (&rest r) (prog1 (apply OLDFUN r) (apply FUNCTION r))) | |
231 | `:around' (lambda (&rest r) (apply FUNCTION OLDFUN r)) | |
bcd7a0a4 | 232 | `:override' (lambda (&rest r) (apply FUNCTION r)) |
231d8498 SM |
233 | `:before-while' (lambda (&rest r) (and (apply FUNCTION r) (apply OLDFUN r))) |
234 | `:before-until' (lambda (&rest r) (or (apply FUNCTION r) (apply OLDFUN r))) | |
235 | `:after-while' (lambda (&rest r) (and (apply OLDFUN r) (apply FUNCTION r))) | |
236 | `:after-until' (lambda (&rest r) (or (apply OLDFUN r) (apply FUNCTION r))) | |
d36ed1c8 SM |
237 | `:filter-args' (lambda (&rest r) (apply OLDFUN (funcall FUNCTION r))) |
238 | `:filter-return'(lambda (&rest r) (funcall FUNCTION (apply OLDFUN r))) | |
231d8498 SM |
239 | If FUNCTION was already added, do nothing. |
240 | PROPS is an alist of additional properties, among which the following have | |
241 | a special meaning: | |
1668ea90 SM |
242 | - `name': a string or symbol. It can be used to refer to this piece of advice. |
243 | ||
36c0a301 SM |
244 | If PLACE is a simple variable, only its global value will be affected. |
245 | Use (local 'VAR) if you want to apply FUNCTION to VAR buffer-locally. | |
a61428c4 | 246 | |
1668ea90 SM |
247 | If one of FUNCTION or OLDFUN is interactive, then the resulting function |
248 | is also interactive. There are 3 cases: | |
249 | - FUNCTION is not interactive: the interactive spec of OLDFUN is used. | |
250 | - The interactive spec of FUNCTION is itself a function: it should take one | |
251 | argument (the interactive spec of OLDFUN, which it can pass to | |
252 | `advice-eval-interactive-spec') and return the list of arguments to use. | |
253 | - Else, use the interactive spec of FUNCTION and ignore the one of OLDFUN." | |
231d8498 | 254 | (declare (debug t)) ;;(indent 2) |
a61428c4 SM |
255 | (cond ((eq 'local (car-safe place)) |
256 | (setq place `(advice--buffer-local ,@(cdr place)))) | |
257 | ((symbolp place) | |
36c0a301 | 258 | (setq place `(default-value ',place)))) |
231d8498 SM |
259 | `(advice--add-function ,where (gv-ref ,place) ,function ,props)) |
260 | ||
261 | ;;;###autoload | |
262 | (defun advice--add-function (where ref function props) | |
c67c0839 SM |
263 | (let ((a (advice--member-p function (cdr (assq 'name props)) |
264 | (gv-deref ref)))) | |
265 | (when a | |
266 | ;; The advice is already present. Remove the old one, first. | |
267 | (setf (gv-deref ref) | |
268 | (advice--remove-function (gv-deref ref) (advice--car a)))) | |
231d8498 SM |
269 | (setf (gv-deref ref) |
270 | (advice--make where function (gv-deref ref) props)))) | |
271 | ||
bcd7a0a4 | 272 | ;;;###autoload |
231d8498 SM |
273 | (defmacro remove-function (place function) |
274 | "Remove the FUNCTION piece of advice from PLACE. | |
275 | If FUNCTION was not added to PLACE, do nothing. | |
276 | Instead of FUNCTION being the actual function, it can also be the `name' | |
277 | of the piece of advice." | |
278 | (declare (debug t)) | |
a61428c4 SM |
279 | (cond ((eq 'local (car-safe place)) |
280 | (setq place `(advice--buffer-local ,@(cdr place)))) | |
281 | ((symbolp place) | |
282 | (error "Use (default-value '%S) or (local '%S)" place place))) | |
231d8498 SM |
283 | (gv-letplace (getter setter) place |
284 | (macroexp-let2 nil new `(advice--remove-function ,getter ,function) | |
285 | `(unless (eq ,new ,getter) ,(funcall setter new))))) | |
286 | ||
287 | ;;;; Specific application of add-function to `symbol-function' for advice. | |
288 | ||
289 | (defun advice--subst-main (old new) | |
a731fc1b SM |
290 | (advice--tweak old |
291 | (lambda (first _rest _props) (if (not first) new)))) | |
231d8498 | 292 | |
413d4689 SM |
293 | (defun advice--normalize (symbol def) |
294 | (cond | |
295 | ((special-form-p def) | |
296 | ;; Not worth the trouble trying to handle this, I think. | |
a77b8d5e | 297 | (error "advice-add failure: %S is a special form" symbol)) |
413d4689 SM |
298 | ((and (symbolp def) |
299 | (eq 'macro (car-safe (ignore-errors (indirect-function def))))) | |
300 | (let ((newval (cons 'macro (cdr (indirect-function def))))) | |
301 | (put symbol 'advice--saved-rewrite (cons def newval)) | |
302 | newval)) | |
303 | ;; `f' might be a pure (hence read-only) cons! | |
304 | ((and (eq 'macro (car-safe def)) | |
305 | (not (ignore-errors (setcdr def (cdr def)) t))) | |
306 | (cons 'macro (cdr def))) | |
307 | (t def))) | |
308 | ||
309 | (defsubst advice--strip-macro (x) | |
310 | (if (eq 'macro (car-safe x)) (cdr x) x)) | |
311 | ||
231d8498 | 312 | (defun advice--defalias-fset (fsetfun symbol newdef) |
413d4689 SM |
313 | (when (get symbol 'advice--saved-rewrite) |
314 | (put symbol 'advice--saved-rewrite nil)) | |
315 | (setq newdef (advice--normalize symbol newdef)) | |
316 | (let* ((olddef (advice--strip-macro | |
317 | (if (fboundp symbol) (symbol-function symbol)))) | |
231d8498 SM |
318 | (oldadv |
319 | (cond | |
413d4689 SM |
320 | ((null (get symbol 'advice--pending)) |
321 | (or olddef | |
322 | (progn | |
323 | (message "Delayed advice activation failed for %s: no data" | |
324 | symbol) | |
325 | nil))) | |
326 | ((or (not olddef) (autoloadp olddef)) | |
327 | (prog1 (get symbol 'advice--pending) | |
328 | (put symbol 'advice--pending nil))) | |
231d8498 SM |
329 | (t (message "Dropping left-over advice--pending for %s" symbol) |
330 | (put symbol 'advice--pending nil) | |
331 | olddef)))) | |
413d4689 SM |
332 | (let* ((snewdef (advice--strip-macro newdef)) |
333 | (snewadv (advice--subst-main oldadv snewdef))) | |
334 | (funcall (or fsetfun #'fset) symbol | |
335 | (if (eq snewdef newdef) snewadv (cons 'macro snewadv)))))) | |
231d8498 SM |
336 | |
337 | ||
338 | ;;;###autoload | |
339 | (defun advice-add (symbol where function &optional props) | |
340 | "Like `add-function' but for the function named SYMBOL. | |
341 | Contrary to `add-function', this will properly handle the cases where SYMBOL | |
342 | is defined as a macro, alias, command, ..." | |
343 | ;; TODO: | |
344 | ;; - record the advice location, to display in describe-function. | |
345 | ;; - change all defadvice in lisp/**/*.el. | |
346 | ;; - rewrite advice.el on top of this. | |
347 | ;; - obsolete advice.el. | |
413d4689 SM |
348 | (let* ((f (and (fboundp symbol) (symbol-function symbol))) |
349 | (nf (advice--normalize symbol f))) | |
350 | (unless (eq f nf) ;; Most importantly, if nf == nil! | |
351 | (fset symbol nf)) | |
231d8498 | 352 | (add-function where (cond |
413d4689 | 353 | ((eq (car-safe nf) 'macro) (cdr nf)) |
1668ea90 SM |
354 | ;; Reasons to delay installation of the advice: |
355 | ;; - If the function is not yet defined, installing | |
356 | ;; the advice would affect `fboundp'ness. | |
357 | ;; - If it's an autoloaded command, | |
358 | ;; advice--make-interactive-form would end up | |
359 | ;; loading the command eagerly. | |
360 | ;; - `autoload' does nothing if the function is | |
361 | ;; not an autoload or undefined. | |
362 | ((or (not nf) (autoloadp nf)) | |
231d8498 SM |
363 | (get symbol 'advice--pending)) |
364 | (t (symbol-function symbol))) | |
365 | function props) | |
366 | (add-function :around (get symbol 'defalias-fset-function) | |
367 | #'advice--defalias-fset)) | |
368 | nil) | |
369 | ||
370 | ;;;###autoload | |
371 | (defun advice-remove (symbol function) | |
372 | "Like `remove-function' but for the function named SYMBOL. | |
373 | Contrary to `remove-function', this will work also when SYMBOL is a macro | |
374 | and it will not signal an error if SYMBOL is not `fboundp'. | |
375 | Instead of the actual function to remove, FUNCTION can also be the `name' | |
376 | of the piece of advice." | |
377 | (when (fboundp symbol) | |
378 | (let ((f (symbol-function symbol))) | |
379 | ;; Can't use the `if' place here, because the body is too large, | |
380 | ;; resulting in use of code that only works with lexical-scoping. | |
381 | (remove-function (if (eq (car-safe f) 'macro) | |
382 | (cdr f) | |
383 | (symbol-function symbol)) | |
384 | function) | |
385 | (unless (advice--p | |
386 | (if (eq (car-safe f) 'macro) (cdr f) (symbol-function symbol))) | |
413d4689 | 387 | ;; Not advised any more. |
231d8498 SM |
388 | (remove-function (get symbol 'defalias-fset-function) |
389 | #'advice--defalias-fset) | |
390 | (if (eq (symbol-function symbol) | |
391 | (cdr (get symbol 'advice--saved-rewrite))) | |
392 | (fset symbol (car (get symbol 'advice--saved-rewrite)))))) | |
393 | nil)) | |
394 | ||
395 | ;; (defun advice-mapc (fun symbol) | |
396 | ;; "Apply FUN to every function added as advice to SYMBOL. | |
397 | ;; FUN is called with a two arguments: the function that was added, and the | |
398 | ;; properties alist that was specified when it was added." | |
399 | ;; (let ((def (or (get symbol 'advice--pending) | |
400 | ;; (if (fboundp symbol) (symbol-function symbol))))) | |
401 | ;; (while (advice--p def) | |
402 | ;; (funcall fun (advice--car def) (advice--props def)) | |
403 | ;; (setq def (advice--cdr def))))) | |
404 | ||
405 | ;;;###autoload | |
413d4689 SM |
406 | (defun advice-member-p (advice function-name) |
407 | "Return non-nil if ADVICE has been added to FUNCTION-NAME. | |
408 | Instead of ADVICE being the actual function, it can also be the `name' | |
231d8498 | 409 | of the piece of advice." |
dabefae5 | 410 | (advice--member-p advice advice |
413d4689 SM |
411 | (or (get function-name 'advice--pending) |
412 | (advice--strip-macro | |
413 | (if (fboundp function-name) | |
414 | (symbol-function function-name)))))) | |
231d8498 | 415 | |
23ba2705 SM |
416 | ;; When code is advised, called-interactively-p needs to be taught to skip |
417 | ;; the advising frames. | |
418 | ;; FIXME: This Major Ugly Hack won't handle calls to called-interactively-p | |
419 | ;; done from the advised function if the deepest advice is an around advice! | |
420 | ;; In other cases (calls from an advice or calls from the advised function when | |
421 | ;; the deepest advice is not an around advice), it should hopefully get | |
422 | ;; it right. | |
423 | (add-hook 'called-interactively-p-functions | |
424 | #'advice--called-interactively-skip) | |
425 | (defun advice--called-interactively-skip (origi frame1 frame2) | |
426 | (let* ((i origi) | |
427 | (get-next-frame | |
428 | (lambda () | |
429 | (setq frame1 frame2) | |
430 | (setq frame2 (internal--called-interactively-p--get-frame i)) | |
431 | ;; (message "Advice Frame %d = %S" i frame2) | |
432 | (setq i (1+ i))))) | |
433 | (when (and (eq (nth 1 frame2) 'apply) | |
434 | (progn | |
435 | (funcall get-next-frame) | |
436 | (advice--p (indirect-function (nth 1 frame2))))) | |
437 | (funcall get-next-frame) | |
438 | ;; If we now have the symbol, this was the head advice and | |
439 | ;; we're done. | |
440 | (while (advice--p (nth 1 frame1)) | |
441 | ;; This was an inner advice called from some earlier advice. | |
442 | ;; The stack frames look different depending on the particular | |
443 | ;; kind of the earlier advice. | |
444 | (let ((inneradvice (nth 1 frame1))) | |
445 | (if (and (eq (nth 1 frame2) 'apply) | |
446 | (progn | |
447 | (funcall get-next-frame) | |
448 | (advice--p (indirect-function | |
449 | (nth 1 frame2))))) | |
450 | ;; The earlier advice was something like a before/after | |
451 | ;; advice where the "next" code is called directly by the | |
452 | ;; advice--p object. | |
453 | (funcall get-next-frame) | |
454 | ;; It's apparently an around advice, where the "next" is | |
455 | ;; called by the body of the advice in any way it sees fit, | |
456 | ;; so we need to skip the frames of that body. | |
457 | (while | |
458 | (progn | |
459 | (funcall get-next-frame) | |
460 | (not (and (eq (nth 1 frame2) 'apply) | |
461 | (eq (nth 3 frame2) inneradvice))))) | |
462 | (funcall get-next-frame) | |
463 | (funcall get-next-frame)))) | |
464 | (- i origi 1)))) | |
465 | ||
231d8498 SM |
466 | |
467 | (provide 'nadvice) | |
468 | ;;; nadvice.el ends here |