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+;;; elisp-slime-nav.el --- Make M-. and M-, work in elisp like they do in slime
+
+;; Copyright (C) 2016  Steve Purcell
+
+;; Author: Steve Purcell <steve@sanityinc.com>
+;; Keywords: navigation slime elisp emacs-lisp
+;; URL: https://github.com/purcell/elisp-slime-nav
+;; Package-Version: 20160128.1109
+;; Package-X-Original-Version: 0
+;; Package-Requires: ((cl-lib "0.2"))
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; This package provides Slime's convenient "M-." and "M-," navigation
+;; in `emacs-lisp-mode', together with an elisp equivalent of
+;; `slime-describe-symbol', bound by default to `C-c C-d d`.
+;;
+;; When the main functions are given a prefix argument, they will
+;; prompt for the symbol upon which to operate.
+;;
+;; Usage:
+;;
+;; Enable the package in elisp and ielm modes as follows:
+;;
+;;   (require 'elisp-slime-nav) ;; optional if installed via package.el
+;;   (dolist (hook '(emacs-lisp-mode-hook ielm-mode-hook))
+;;     (add-hook hook 'turn-on-elisp-slime-nav-mode))
+;;
+;; Known issues:
+;;
+;;   When navigating into Emacs' C source, "M-," will not be bound to
+;;   the same command, but "M-*" will typically do the trick.
+;;
+;;; Code:
+
+(require 'etags)
+(require 'help-mode)
+
+(defvar elisp-slime-nav-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "M-.")         'elisp-slime-nav-find-elisp-thing-at-point)
+    (define-key map (kbd "M-,")         'pop-tag-mark)
+    (define-key map (kbd "C-c C-d d")   'elisp-slime-nav-describe-elisp-thing-at-point)
+    (define-key map (kbd "C-c C-d C-d") 'elisp-slime-nav-describe-elisp-thing-at-point)
+    map))
+
+;;;###autoload
+(define-minor-mode elisp-slime-nav-mode
+  "Enable Slime-style navigation of elisp symbols using M-. and M-,"
+  nil " SliNav" elisp-slime-nav-mode-map)
+
+;;;###autoload
+(defun turn-on-elisp-slime-nav-mode ()
+  "Explicitly enable `elisp-slime-nav-mode'."
+  (elisp-slime-nav-mode 1))
+
+(defun elisp-slime-nav--all-navigable-symbol-names ()
+  "Return a list of strings for the symbols to which navigation is possible."
+  (let ((result '()))
+    (mapatoms
+     (lambda (x)
+       (when (or (fboundp x) (boundp x) (symbol-plist x) (facep x))
+         (push (symbol-name x) result))))
+    result))
+
+(defun elisp-slime-nav--read-symbol-at-point ()
+  "Return the symbol at point as a string.
+If `current-prefix-arg' is not nil, the user is prompted for the symbol."
+  (let* ((sym-at-point (symbol-at-point))
+         (at-point (and sym-at-point (symbol-name sym-at-point))))
+    (if (or current-prefix-arg (null at-point))
+        (completing-read "Symbol: "
+                         (elisp-slime-nav--all-navigable-symbol-names)
+                         nil t nil nil at-point)
+      at-point)))
+
+;;;###autoload
+(defun elisp-slime-nav-find-elisp-thing-at-point (sym-name)
+  "Find the elisp thing at point, be it a function, variable, library or face.
+
+With a prefix arg, or if there is no thing at point, prompt for
+the symbol to jump to.
+
+Argument SYM-NAME is the thing to find."
+  (interactive (list (elisp-slime-nav--read-symbol-at-point)))
+  (when sym-name
+    (let ((sym (intern sym-name)))
+      (message "Searching for %s..." sym-name)
+      (if (fboundp 'xref-push-marker-stack)
+          (xref-push-marker-stack)
+        (with-no-warnings
+          (ring-insert find-tag-marker-ring (point-marker))))
+      (cond
+       ((fboundp sym)
+        (find-function sym))
+       ((boundp sym)
+        (find-variable sym))
+       ((or (featurep sym) (locate-library sym-name))
+        (find-library sym-name))
+       ((facep sym)
+        (find-face-definition sym))
+       (t
+        (pop-tag-mark)
+        (error "Don't know how to find '%s'" sym))))))
+
+;;;###autoload
+(defun elisp-slime-nav-describe-elisp-thing-at-point (sym-name)
+  "Display the full documentation of the elisp thing at point.
+
+The named subject may be a function, variable, library or face.
+
+With a prefix arg, or if there is not \"thing\" at point, prompt
+for the symbol to jump to.
+
+Argument SYM-NAME is the thing to find."
+  (interactive (list (elisp-slime-nav--read-symbol-at-point)))
+  (if (fboundp 'describe-symbol)
+      (describe-symbol (intern sym-name))
+    (with-no-warnings
+      (help-xref-interned (intern sym-name)))))
+
+
+(provide 'elisp-slime-nav)
+;; Local Variables:
+;; indent-tabs-mode: nil
+;; End:
+;;; elisp-slime-nav.el ends here