Add a basic Java classpath browser

Author: Bozhidar Batsov

CHANGELOG.md

@@ -15,6 +15,7 @@ simpler to gain understanding of what you're using.
 * Enhance stacktrace to definition navigation to work for interactively defined vars.
 * New vars: `cider-to-nrepl-filename-function` and `cider-from-nrepl-filename-function`
 are used to translate filenames from/to the nREPL server (default Cygwin implementation provided).
+* Java classpath browser (`M-x cider-classpath`).
 
 ### Changes
 

cider-classpath.el

@@ -0,0 +1,103 @@
+;;; cider-classpath.el --- Basic Java classpath browser
+
+;; Copyright © 2014 Bozhidar Batsov
+
+;; 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/>.
+
+;; This file is not part of GNU Emacs.
+
+;;; Commentary:
+
+;; Basic Java classpath browser for CIDER.
+
+;;; Code:
+
+(require 'cider-client)
+(require 'cider-interaction)
+
+(defvar cider-classpath-buffer "*Classpath*")
+
+(defvar cider-classpath-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map cider-popup-buffer-mode-map)
+    (define-key map [return] 'cider-classpath-operate-on-point)
+    (define-key map "n" 'next-line)
+    (define-key map "p" 'previous-line)
+    map))
+
+(define-derived-mode cider-classpath-mode special-mode "classpath"
+  "Major mode for browsing the entries in Java's classpath.
+
+\\{cider-classpath-mode-map}"
+  (setq buffer-read-only t)
+  (setq-local electric-indent-chars nil)
+  (setq-local truncate-lines t))
+
+(defun cider-classpath-list (buffer items)
+  "Populate BUFFER with ITEMS."
+  (with-current-buffer buffer
+    (cider-classpath-mode)
+    (let ((inhibit-read-only t))
+      (erase-buffer)
+      (dolist (item items)
+        (insert item)
+        (newline))
+      (goto-char (point-min)))))
+
+(defun cider-classpath-properties (text)
+  "Decorate TEXT with a clickable keymap and function face."
+  (let ((face (cond
+               ((not (file-exists-p text)) 'font-lock-warning-face)
+               ((file-directory-p text) 'dired-directory)
+               (t 'default))))
+    (propertize text
+                'font-lock-face face
+                'mouse-face 'highlight
+                'keymap cider-classpath-mouse-map)))
+
+(defun cider-classpath-operate-on-point ()
+  "Expand browser according to thing at current point."
+  (interactive)
+  (let* ((bol (line-beginning-position))
+         (eol (line-end-position))
+         (line (buffer-substring-no-properties bol eol)))
+    (if (file-directory-p line)
+        (dired line)
+      (find-file-other-window line))))
+
+(defun cider-classpath-handle-mouse (event)
+  "Handle mouse click EVENT."
+  (interactive "e")
+  (cider-classpath-operate-on-point))
+
+;;;###autoload
+(defun cider-classpath ()
+  "List all classpath entries."
+  (interactive)
+  (with-current-buffer (cider-popup-buffer cider-classpath-buffer t)
+    (let ((names (plist-get
+                  (nrepl-send-sync-request (list "op" "classpath"
+                                                 "session" (nrepl-current-session)))
+                  :value)))
+      (cider-classpath-list (current-buffer)
+                            (mapcar (lambda (name)
+                                      (cider-classpath-properties name))
+                                    names)))))
+
+(defvar cider-classpath-mouse-map (make-sparse-keymap))
+(define-key cider-classpath-mouse-map [mouse-1] 'cider-classpath-handle-mouse)
+
+(provide 'cider-classpath)
+
+;;; cider-classpath.el ends here