mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
114 lines
3.4 KiB
EmacsLisp
114 lines
3.4 KiB
EmacsLisp
;;; loadhist.el --- lisp functions for working with feature groups
|
|
|
|
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
|
|
;; Version: 1.0
|
|
;; Keywords: internal
|
|
|
|
;;; Commentary:
|
|
|
|
;; These functions exploit the load-history system variable.
|
|
;; Entry points include `unload-feature', `symbol-file', and `feature-file'.
|
|
|
|
;;; Code:
|
|
|
|
(defun symbol-file (sym)
|
|
"Return the input source from which SYM was loaded.
|
|
This is a file name, or nil if the source was a buffer with no associated file."
|
|
(catch 'foundit
|
|
(mapcar
|
|
(function (lambda (x) (if (memq sym (cdr x)) (throw 'foundit (car x)))))
|
|
load-history)
|
|
nil))
|
|
|
|
(defun feature-symbols (feature)
|
|
"Return the file and list of symbols associated with a given FEATURE."
|
|
(catch 'foundit
|
|
(mapcar
|
|
(function (lambda (x)
|
|
(if (member (cons 'provide feature) (cdr x))
|
|
(throw 'foundit x))))
|
|
load-history)
|
|
nil))
|
|
|
|
(defun feature-file (feature)
|
|
"Return the file name from which a given FEATURE was loaded.
|
|
Actually, return the load argument, if any; this is sometimes the name of a
|
|
Lisp file without an extension. If the feature came from an eval-buffer on
|
|
a buffer with no associated file, or an eval-region, return nil."
|
|
(if (not (featurep feature))
|
|
(error "%s is not a currently loaded feature." (symbol-name feature))
|
|
(car (feature-symbols feature))))
|
|
|
|
(defun file-provides (file)
|
|
"Return the list of features provided by FILE."
|
|
(let ((symbols (cdr (assoc file load-history))) (provides nil))
|
|
(mapcar
|
|
(function (lambda (x)
|
|
(if (and (consp x) (eq (car x) 'provide))
|
|
(setq provides (cons (cdr x) provides)))))
|
|
symbols)
|
|
provides
|
|
))
|
|
|
|
(defun file-requires (file)
|
|
"Return the list of features required by FILE."
|
|
(let ((symbols (cdr (assoc file load-history))) (requires nil))
|
|
(mapcar
|
|
(function (lambda (x)
|
|
(if (and (consp x) (eq (car x) 'require))
|
|
(setq requires (cons (cdr x) requires)))))
|
|
symbols)
|
|
requires
|
|
))
|
|
|
|
(defun set-intersect (p q)
|
|
;; Return the set intersection of two lists
|
|
(let ((ret nil))
|
|
(mapcar
|
|
(function (lambda (x) (if (memq x q) (setq ret (cons x ret)))))
|
|
p)
|
|
ret
|
|
))
|
|
|
|
(defun file-dependents (file)
|
|
;; Return the list of loaded libraries that depend on FILE.
|
|
(let ((provides (file-provides file)) (dependents nil))
|
|
(mapcar
|
|
(function (lambda (x)
|
|
(if (set-intersect provides (file-requires (car x)))
|
|
(setq dependents (cons (car x) dependents)))))
|
|
load-history)
|
|
dependents
|
|
))
|
|
|
|
;;;###autoload
|
|
(defun unload-feature (feature &optional force)
|
|
"Unload the library that provided FEATURE, restoring all its autoloads.
|
|
If the feature is required by any other loaded code, and optional FORCE
|
|
is nil, raise an error."
|
|
(interactive "SFeature: ")
|
|
(if (not (featurep feature))
|
|
(error "%s is not a currently loaded feature." (symbol-name feature)))
|
|
(if (not force)
|
|
(let* ((file (feature-file feature)) (dependents (file-dependents file)))
|
|
(if dependents
|
|
(error "Loaded libraries %s depend on %s."
|
|
(prin1-to-string dependents) file)
|
|
)))
|
|
(let* ((flist (feature-symbols feature)) (file (car flist)))
|
|
(mapcar
|
|
(function (lambda (x)
|
|
(cond ((stringp x) nil)
|
|
((consp x) nil)
|
|
((boundp x) (makunbound x))
|
|
((fboundp x)
|
|
(fmakunbound x)
|
|
(let ((aload (get x 'autoload)))
|
|
(if aload (fset x (cons 'autoload aload)))))))
|
|
)
|
|
(cdr flist))))
|
|
|
|
(provide 'loadhist)
|
|
|
|
;;; loadhist.el ends here
|