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