;;; ess-rdired.el --- prototype object browser for R, looks like dired mode.
;; Author: Stephen Eglen <stephen@anc.ed.ac.uk>
;; Maintainer: Stephen Eglen <stephen@anc.ed.ac.uk>
;; Created: Thu 24 Oct 2002
;; $Id: ess-rdired.el,v 1.1 2003/01/01 18:40:51 stephen Exp $

;; This file is not part of GNU Emacs.

;; ess-rdired.el 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 2, or (at your option)
;; any later version.

;; ess-rdired.el 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 GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;; This provides a dired-like buffer for R objects.  Instead of
;; operating on files, we operate on R objects in the current
;; environment.  Objects can be viewed, edited, deleted, plotted and
;; so on.

;; Installation and usage.
;;
;; Load in this library, e.g. with the command:
;; (autoload 'ess-rdired "ess-rdired" "View *R* objects in a dired-like buffer." t)
;;
;; After loading this file, do "M-x R" to start an R session, then
;; create a few variables:
;; s <- sin(seq(from=0, to=8*pi, length=100))
;; x <- c(1, 4, 9)
;; y <- rnorm(20)
;; z <- TRUE

;; Then in Emacs, do "M-x ess-rdired" and you should see the following in
;; the buffer *R dired*:
;;        mode length
;;   s numeric    100
;;   x numeric      3
;;   y numeric     20
;;   z logical      1

;; Type "?" in the buffer to see the documentation.  e.g. when the
;; cursor is on the line for `s', type 'p' to plot it, or `v' to view
;; its contents in a buffer.  Then type 'd' to mark it for deletion.

;; How it works.

;; Most of the hardwork is done by the R routine .rdired.objects(),
;; which, when called, produces the list of objects in a tidy format.
;; This function is stored within the lisp variable `ess-rdired-objects',
;; and can be altered to provide other information if you so need it.
;; (Martin Maechler suggested providing output from str() here.)

;; Tested on Emacs 21.2, 21.3 pretest and XEmacs 21.1.14, using R 1.6.

;; Todo - compare functionality with ess-mouse-me (ess-mous.el).

;; Todo - How to select alternative environments?  Currently only
;; shows objects in the .GlobalEnv?  See BrowseEnv() in 1.6.x for way
;; of browsing other environments.

;; Todo - problem with fix -- have to wait for fix() command to return
;; before *R* buffer can be used again.  This can get stuck, umm. not
;; sure what is going wrong here.  Maybe add a hook to the temp buffer
;; so that when buffer is killed, we send an instruction to R to
;; update the value of the variable to the contents of the buffer.
;; This way *R* doesn't have to wait.

;; Todo - small bug in .rdired.objects -- if we have a variable called
;; `my.x', its value is replaced by the value of my.x used in the
;; sapply() calls within .rdired.objects().


(defvar ess-rdired-objects ".rdired.objects <- function(objs) {
  if (length(objs)==0)
    \"No objects to view!\"
  else {
  mode <- sapply(objs, function(my.x) {
    eval(parse(text=(paste('data.class(',my.x,')',sep=''))))})
  length <- sapply(objs, function(my.x) {
    eval(parse(text=(paste('length(',my.x,')',sep=''))))
  })
  d <- data.frame(mode, length)
  row.names(d) <- paste('  ', row.names(d), sep='')
  d
  }
}; .rdired.objects(ls())"
  "Function to call within R to print information on objects.  The last
line of this string should be the instruction to call the
function which prints the output for rdired.")

(defvar ess-rdired-buffer "*R dired*"
  "Name of buffer for displaying R objects.")

(defvar ess-rdired-mode-map nil
  "Keymap for the *R dired* buffer.")

(if ess-rdired-mode-map
    ()
  (setq ess-rdired-mode-map (make-sparse-keymap))

  (define-key ess-rdired-mode-map "?" 'ess-rdired-help)
  (define-key ess-rdired-mode-map "d" 'ess-rdired-delete)
  (define-key ess-rdired-mode-map "u" 'ess-rdired-undelete)
  (define-key ess-rdired-mode-map "x" 'ess-rdired-expunge)
  ;; editing requires a little more work.
  ;;(define-key ess-rdired-mode-map "e" 'ess-rdired-edit)
  (define-key ess-rdired-mode-map "v" 'ess-rdired-view)
  (define-key ess-rdired-mode-map "V" 'ess-rdired-View)
  (define-key ess-rdired-mode-map "p" 'ess-rdired-plot)
  (define-key ess-rdired-mode-map "s" 'ess-rdired-sort)
  (define-key ess-rdired-mode-map "q" 'ess-rdired-quit)
  (define-key ess-rdired-mode-map "y" 'ess-rdired-type)	;what type?
  (define-key ess-rdired-mode-map " "  'ess-rdired-next-line)
  (define-key ess-rdired-mode-map [backspace] 'ess-rdired-previous-line)
  (define-key ess-rdired-mode-map "\C-n" 'ess-rdired-next-line)
  (define-key ess-rdired-mode-map "\C-p" 'ess-rdired-previous-line)

  ;; R mode keybindings.
  (define-key ess-rdired-mode-map "\C-c\C-s" 'ess-rdired-switch-process)
  (define-key ess-rdired-mode-map "\C-c\C-y" 'ess-switch-to-ESS)
  (define-key ess-rdired-mode-map "\C-c\C-z" 'ess-switch-to-end-of-ESS)

  (define-key ess-rdired-mode-map [down] 'ess-rdired-next-line)
  (define-key ess-rdired-mode-map [up] 'ess-rdired-previous-line)
  (define-key ess-rdired-mode-map "g" 'revert-buffer)
  (if (featurep 'xemacs)
      (define-key ess-rdired-mode-map [button2] 'ess-rdired-mouse-view)
    (define-key ess-rdired-mode-map [mouse-2] 'ess-rdired-mouse-view)
    ))

(defun ess-rdired-mode ()
  "Major mode for output from `ess-rdired'.
`ess-rdired' provides a dired-like mode for R objects.  It shows the
list of current objects in the current environment, one-per-line.  You
can then examine these objects, plot them, and so on.
\\{ess-rdired-mode-map}"
  (kill-all-local-variables)
  (make-local-variable 'revert-buffer-function)
  (setq revert-buffer-function 'ess-rdired-revert-buffer)
  (use-local-map ess-rdired-mode-map)
  (setq major-mode 'ess-rdired-mode)
  (setq mode-name (concat "RDired " ess-local-process-name)))

(defun ess-rdired ()
  "Run dired-like mode on R objects.
This is the main function.  See documentation for `ess-rdired-mode' though
for more information!"
  (interactive)
  (if (get-buffer ess-rdired-buffer)
      (progn
	(set-buffer ess-rdired-buffer)
	(setq buffer-read-only nil)))

   (ess-execute ess-rdired-objects
		nil
		(substring ess-rdired-buffer 1 (- (length ess-rdired-buffer) 1))
		)

  (pop-to-buffer ess-rdired-buffer)
  ;; When definiting the function .rdired.objects(), a "+ " is printed
  ;; for every line of the function definition; these are deleted
  ;; here.
  (delete-char (* (1- (length (split-string ess-rdired-objects "\n"))) 2))

  ;; todo: not sure how to make ess-rdired-sort-num buffer local?
  ;;(set (make-local-variable 'ess-rdired-sort-num) 2)
  ;;(make-variable-buffer-local 'ess-rdired-sort-num)
  (setq ess-rdired-sort-num 1)
  (ess-rdired-insert-set-properties (save-excursion
				  (goto-char (point-min))
				  (forward-line 1)
				  (point))
				(point-max))
  (setq buffer-read-only t)
  (ess-rdired-mode)
  )

(defun ess-rdired-object ()
  "Return name of object on current line."
  (save-excursion
    (beginning-of-line)
    (forward-char 2)
    (if (looking-at " ")
	nil				;on first line
      ;;
      (let (beg end)
	(setq beg (point))
	(search-forward " ")		;assume space follows object name.
	(buffer-substring-no-properties beg (1- (point)))))))

(defun ess-rdired-edit ()
  "Edit (fix) the object at point."
  (interactive)
  (let ((objname (ess-rdired-object)))
    (ess-command (concat "edit(" objname ")\n"))))

(defun ess-rdired-view ()
  "View the object at point."
  (interactive)
  (let ((objname (ess-rdired-object)))
    (ess-execute objname nil "R view" )))

(defun ess-rdired-View ()
  "View the object at point in its own buffer.
Like `ess-rdired-view', but the object gets its own buffer name."
  (interactive)
  (let ((objname (ess-rdired-object)))
    (ess-execute ;;(concat "edit(" objname ")\n")
     objname
     nil (concat "R view " objname ))))

(defun ess-rdired-plot ()
  "Plot the object on current line."
  (interactive)
  (let ((objname (ess-rdired-object)))
    (ess-command (concat "plot(" objname ")\n"))))

(defun ess-rdired-type ()
  "Run the mode() on command at point.
Named type because of similarity
with the dired command bound to y key."
  (interactive)
  (let ((objname (ess-rdired-object))
	;; create a temp buffer, and then show output in echo area
	(tmpbuf (get-buffer-create "**ess-rdired-mode**")))
    (if objname
	(progn
	  (ess-command (concat "mode(" objname ")\n")  tmpbuf )
	  (set-buffer tmpbuf)
	  (message (concat
		    objname ": "
		    (buffer-substring (+ 4 (point-min)) (1- (point-max)))))
	  (kill-buffer tmpbuf)))))

(defun ess-rdired-delete (arg)
  "Mark the current (or next ARG) objects for deletion.
If point is on first line, all objects are marked for deletion."
  (interactive "p")
  (ess-rdired-mark "D" arg))

(defun ess-rdired-undelete (arg)
  "Unmark the current (or next ARG) objects.
If point is on first line, all objects will be unmarked."
  (interactive "p")
  (ess-rdired-mark " " arg))

(defun ess-rdired-mark (mark-char arg)
  "Mark the object, using MARK-CHAR,  on current line (or next ARG lines)."
  ;; If we are on first line, mark all lines.
  (let ((buffer-read-only nil)
	move)
    (if (eq (point-min)
	    (save-excursion (beginning-of-line) (point)))
	(progn
	  ;; we are on first line, so make a note of point, and count
	  ;; how many objects we want to delete.  Then at end of defun,
	  ;; restore point.
	  (setq move (point))
	  (forward-line 1)
	  (setq arg (count-lines (point) (point-max)))))
    (while (and (> arg 0) (not (eobp)))
      (setq arg (1- arg))
      (beginning-of-line)
      (progn
	(insert mark-char)
	(delete-char 1)
	(forward-line 1)))
    (if move
	(goto-char move))))


(defun ess-rdired-expunge ()
  "Delete the marked objects.
User is queried first to check that objects should really be deleted."
  (interactive)
  (let ((objs "rm(") 
	(count 0))
    (save-excursion
      (goto-line 2)
      (while (< (count-lines (point-min) (point))
		(count-lines (point-min) (point-max)))
	(beginning-of-line)
	(if (looking-at "^D ")
	    (setq count (1+ count)
		  objs (concat objs (ess-rdired-object) ", " )))
	(forward-line 1)
	))
    (if (> count 0)
	;; found objects to delete
	(progn
	  (setq objs (concat
		      (substring objs 0 (- (length objs) 2))
		      ")\n"))
	  (if (yes-or-no-p (format "Delete %d %s " count
				   (if (> count 1) "objects" "object")))
	      (progn
		(ess-command objs)
		(ess-rdired)
		)))
      ;; else nothing to delete
      (message "no objects set to delete")
      )))

;; Fancy delete method, based on dired.  Bit too much for our needs?
;; (defun ess-rdired-expunge ()
;;   "Delete the marked objects.
;; User is queried first to check that objects should really be deleted."
;;   (interactive)
;;   (let ((objs)
;;	(cmd "rm("))
;;     (save-excursion
;;       (goto-line 2)
;;       (while (< (count-lines (point-min) (point))
;;		(count-lines (point-min) (point-max)))
;;	(beginning-of-line)
;;	(if (looking-at "^D ")
;;	    (progn
;;	      (setq objs (cons (ess-rdired-object) objs ))
;;	      (setq cmd (concat cmd (ess-rdired-object) ", "))
;;	      ))
;;	(forward-line 1)
;;	))
;;     (if (> (length objs) 0)
;;	;; found objects to delete
;;	(if
;;	    (dired-mark-pop-up "*RDired deletions*" 'delete
;;			       objs dired-deletion-confirmer
;;			       (format "delete %s "
;;				       (dired-mark-prompt nil objs)))
;;	    ;; should delete the objects.
;;	    (progn
;;	      (setq cmd (concat (substring cmd 0 (- (length cmd) 2))
;;				")\n"))
;;	      (ess-command cmd)
;;	      (ess-rdired)))
;;       ;; else nothing to delete
;;       (message "no objects set to delete")
;;       )))

(defun ess-rdired-quit ()
  "Quit the R dired buffer."
  (interactive)
  (kill-buffer ess-rdired-buffer))

(defun ess-rdired-revert-buffer (ignore noconfirm)
  "Update the buffer list (in case object list has changed).
Arguments IGNORE and NOCONFIRM currently not used."
  (ess-rdired))

(defun ess-rdired-help ()
  "Show help for `ess-rdired-mode'."
  (interactive)
  (describe-function 'ess-rdired-mode))

(defun ess-rdired-sort ()
  "Sort the rdired output according to one of the columns.
Rotate between the alternative sorting methods."
  (interactive)
  (setq ess-rdired-sort-num (1+ ess-rdired-sort-num))
  (let ((buffer-read-only nil)
	(beg (save-excursion
	       (goto-char (point-min))
	       (forward-line 1)
	       (point)))
	(end (point-max)))
  (if (> ess-rdired-sort-num 3)
      (setq ess-rdired-sort-num 1))
  (cond ((eq ess-rdired-sort-num 1)
	 (sort-fields 1 beg end))
	((eq ess-rdired-sort-num 2)
	 (sort-fields 2 beg end))
	((eq ess-rdired-sort-num 3)
	 (sort-numeric-fields 3 beg end)))))

(defun ess-rdired-next-line (arg)
  "Move down lines then position at object.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (next-line arg)
  (ess-rdired-move-to-object))

(defun ess-rdired-previous-line (arg)
  "Move up lines then position at object.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (previous-line arg)
  (ess-rdired-move-to-object))

(defun ess-rdired-move-to-object ()
  "Put point at start of object."
  (beginning-of-line)
  (forward-char 2)
  )

(defun ess-rdired-mouse-view (event)
  "In rdired, visit the object on the line you click on."
  (interactive "e")
  (let (window pos)
    (save-excursion
      (if (featurep 'xemacs)
	  ;; XEmacs
	  (setq window (event-window event)
		pos (event-point event))
	;; Emacs
	(setq window (posn-window (event-end event))
	      pos (posn-point (event-end event))))
      (if (not (windowp window))
	  (error "No file chosen"))
      (set-buffer (window-buffer window))
      (goto-char pos)
      (ess-rdired-view))))

(defun ess-rdired-insert-set-properties (beg end)
  "Add mouse highlighting to each object name in the R dired buffer."
  (save-excursion
    (goto-char beg)
    (while (< (point) end)
      (ess-rdired-move-to-object)
      (add-text-properties
       (point)
       (save-excursion
	 (search-forward " ")
	 (1- (point)))
       '(mouse-face highlight
		    help-echo "mouse-2: view object in other window"))
      (forward-line 1))))

(defun ess-rdired-switch-process ()
  "Switch to examine different *R* process.
If you have multiple R processes running, e.g. *R*, *R:2*, *R:3*, you can
use this command to choose which R process you would like to examine.
After switching to a new process, the buffer is updated."
  (interactive)
  (ess-switch-process)
  (ess-rdired))

;;; ess-rdired.el ends here.