/usr/share/emacs/site-lisp/elpa-src/slime-2.20/contrib/slime-xref-browser.el is in slime 2:2.20+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require 'slime))
(define-slime-contrib slime-xref-browser
"Xref browsing with tree-widget"
(:authors "Rui Patrocínio <rui.patrocinio@netvisao.pt>")
(:license "GPL"))
;;;; classes browser
(defun slime-expand-class-node (widget)
(or (widget-get widget :args)
(let ((name (widget-get widget :tag)))
(cl-loop for kid in (slime-eval `(swank:mop :subclasses ,name))
collect `(tree-widget :tag ,kid
:expander slime-expand-class-node
:has-children t)))))
(defun slime-browse-classes (name)
"Read the name of a class and show its subclasses."
(interactive (list (slime-read-symbol-name "Class Name: ")))
(slime-call-with-browser-setup
(slime-buffer-name :browser) (slime-current-package) "Class Browser"
(lambda ()
(widget-create 'tree-widget :tag name
:expander 'slime-expand-class-node
:has-echildren t))))
(defvar slime-browser-map nil
"Keymap for tree widget browsers")
(require 'tree-widget)
(unless slime-browser-map
(setq slime-browser-map (make-sparse-keymap))
(set-keymap-parent slime-browser-map widget-keymap)
(define-key slime-browser-map "q" 'bury-buffer))
(defun slime-call-with-browser-setup (buffer package title fn)
(switch-to-buffer buffer)
(kill-all-local-variables)
(setq slime-buffer-package package)
(let ((inhibit-read-only t)) (erase-buffer))
(widget-insert title "\n\n")
(save-excursion
(funcall fn))
(lisp-mode-variables t)
(slime-mode t)
(use-local-map slime-browser-map)
(widget-setup))
;;;; Xref browser
(defun slime-fetch-browsable-xrefs (type name)
"Return a list ((LABEL DSPEC)).
LABEL is just a string for display purposes.
DSPEC can be used to expand the node."
(let ((xrefs '()))
(cl-loop for (_file . specs) in (slime-eval `(swank:xref ,type ,name)) do
(cl-loop for (dspec . _location) in specs do
(let ((exp (ignore-errors (read (downcase dspec)))))
(cond ((and (consp exp) (eq 'flet (car exp)))
;; we can't expand FLET references so they're useless
)
((and (consp exp) (eq 'method (car exp)))
;; this isn't quite right, but good enough for now
(push (list dspec (string (cl-second exp))) xrefs))
(t
(push (list dspec dspec) xrefs))))))
xrefs))
(defun slime-expand-xrefs (widget)
(or (widget-get widget :args)
(let* ((type (widget-get widget :xref-type))
(dspec (widget-get widget :xref-dspec))
(xrefs (slime-fetch-browsable-xrefs type dspec)))
(cl-loop for (label dspec) in xrefs
collect `(tree-widget :tag ,label
:xref-type ,type
:xref-dspec ,dspec
:expander slime-expand-xrefs
:has-children t)))))
(defun slime-browse-xrefs (name type)
"Show the xref graph of a function in a tree widget."
(interactive
(list (slime-read-from-minibuffer "Name: "
(slime-symbol-at-point))
(read (completing-read "Type: " (slime-bogus-completion-alist
'(":callers" ":callees" ":calls"))
nil t ":"))))
(slime-call-with-browser-setup
(slime-buffer-name :xref) (slime-current-package) "Xref Browser"
(lambda ()
(widget-create 'tree-widget :tag name :xref-type type :xref-dspec name
:expander 'slime-expand-xrefs :has-echildren t))))
(provide 'slime-xref-browser)
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