lisp/emacs-lisp/chart.el

   1 ;;; chart.el --- Draw charts (bar charts, etc)  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 1996, 1998-1999, 2001, 2004-2005, 2007-2013 Free
   4 ;; Software Foundation, Inc.
   5
   6 ;; Author: Eric M. Ludlam  <zappo@gnu.org>
   7 ;; Version: 0.2
   8 ;; Keywords: OO, chart, graph
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26 ;;
  27 ;;   This package is an experiment of mine aiding in the debugging of
  28 ;; eieio, and proved to be neat enough that others may like to use
  29 ;; it.  To quickly see what you can do with chart, run the command
  30 ;; `chart-test-it-all'.
  31 ;;
  32 ;;   Chart current can display bar-charts in either of two
  33 ;; directions.  It also supports ranged (integer) axis, and axis
  34 ;; defined by some set of strings or names.  These name can be
  35 ;; automatically derived from data sequences, which are just lists of
  36 ;; anything encapsulated in a nice eieio object.
  37 ;;
  38 ;;   Current example apps for chart can be accessed via these commands:
  39 ;; `chart-file-count'     - count files w/ matching extensions
  40 ;; `chart-space-usage'    - display space used by files/directories
  41 ;; `chart-emacs-storage'  - Emacs storage units used/free (garbage-collect)
  42 ;; `chart-emacs-lists'    - length of Emacs lists
  43 ;; `chart-rmail-from'     - who sends you the most mail (in -summary only)
  44 ;;
  45 ;; Customization:
  46 ;;
  47 ;;   If you find the default colors and pixmaps unpleasant, or too
  48 ;; short, you can change them.  The variable `chart-face-color-list'
  49 ;; contains a list of colors, and `chart-face-pixmap-list' contains
  50 ;; all the pixmaps to use.  The current pixmaps are those found on
  51 ;; several systems I found.  The two lists should be the same length,
  52 ;; as the long list will just be truncated.
  53 ;;
  54 ;;   If you would like to draw your own stipples, simply create some
  55 ;; xbm's and put them in a directory, then you can add:
  56 ;;
  57 ;; (setq x-bitmap-file-path (cons "~/mybitmaps" x-bitmap-file-path))
  58 ;;
  59 ;; to your .emacs (or wherever) and load the `chart-face-pixmap-list'
  60 ;; with all the bitmaps you want to use.
  61
  62 (require 'eieio)
  63
  64 ;;; Code:
  65 (define-obsolete-variable-alias 'chart-map 'chart-mode-map "24.1")
  66 (defvar chart-mode-map (make-sparse-keymap) "Keymap used in chart mode.")
  67
  68 (defvar chart-local-object nil
  69   "Local variable containing the locally displayed chart object.")
  70 (make-variable-buffer-local 'chart-local-object)
  71
  72 (defvar chart-face-color-list '("red" "green" "blue"
  73                                 "cyan" "yellow" "purple")
  74   "Colors to use when generating `chart-face-list'.
  75 Colors will be the background color.")
  76
  77 (defvar chart-face-pixmap-list
  78   (if (and (fboundp 'display-graphic-p)
  79            (display-graphic-p))
  80       '("dimple1" "scales" "dot" "cross_weave" "boxes" "dimple3"))
  81   "If pixmaps are allowed, display these background pixmaps.
  82 Useful if new Emacs is used on B&W display.")
  83
  84 (defcustom chart-face-use-pixmaps nil
  85   "Non-nil to use fancy pixmaps in the background of chart face colors."
  86   :group 'eieio
  87   :type 'boolean)
  88
  89 (defvar chart-face-list
  90   (if (if (fboundp 'display-color-p)
  91           (display-color-p)
  92         window-system)
  93       (let ((cl chart-face-color-list)
  94             (pl chart-face-pixmap-list)
  95             (faces ())
  96             nf)
  97         (while cl
  98           (setq nf (make-face
  99                     (intern (concat "chart-" (car cl) "-" (car pl)))))
 100           (set-face-background nf (if (condition-case nil
 101                                           (> (x-display-color-cells) 4)
 102                                         (error t))
 103                                       (car cl)
 104                                     "white"))
 105           (set-face-foreground nf "black")
 106           (if (and chart-face-use-pixmaps
 107                    pl
 108                    (fboundp 'set-face-background-pixmap))
 109               (condition-case nil
 110                   (set-face-background-pixmap nf (car pl))
 111                 (error (message "Cannot set background pixmap %s" (car pl)))))
 112           (push nf faces)
 113           (setq cl (cdr cl)
 114                 pl (cdr pl)))
 115         faces))
 116   "Faces used to colorize charts.
 117 List is limited currently, which is ok since you really can't display
 118 too much in text characters anyways.")
 119
 120 (define-derived-mode chart-mode fundamental-mode "CHART"
 121   "Define a mode in Emacs for displaying a chart."
 122   (buffer-disable-undo)
 123   (set (make-local-variable 'font-lock-global-modes) nil)
 124   (font-lock-mode -1)                   ;Isn't it off already?  --Stef
 125   )
 126
 127 (defun chart-new-buffer (obj)
 128   "Create a new buffer NAME in which the chart OBJ is displayed.
 129 Returns the newly created buffer."
 130   (with-current-buffer (get-buffer-create (format "*%s*" (oref obj title)))
 131     (chart-mode)
 132     (setq chart-local-object obj)
 133     (current-buffer)))
 134
 135 (defclass chart ()
 136   ((title :initarg :title
 137           :initform "Emacs Chart")
 138    (title-face :initarg :title-face
 139                :initform 'bold-italic)
 140    (x-axis :initarg :x-axis
 141            :initform nil )
 142    (x-margin :initarg :x-margin
 143              :initform 5)
 144    (x-width :initarg :x-width
 145             )
 146    (y-axis :initarg :y-axis
 147            :initform nil)
 148    (y-margin :initarg :y-margin
 149              :initform 5)
 150    (y-width :initarg :y-width
 151             )
 152    (key-label :initarg :key-label
 153               :initform "Key")
 154    (sequences :initarg :sequences
 155               :initform nil)
 156    )
 157   "Superclass for all charts to be displayed in an Emacs buffer.")
 158
 159 (defmethod initialize-instance :AFTER ((obj chart) &rest _fields)
 160   "Initialize the chart OBJ being created with FIELDS.
 161 Make sure the width/height is correct."
 162   (oset obj x-width (- (window-width) 10))
 163   (oset obj y-width (- (window-height) 12)))
 164
 165 (defclass chart-axis ()
 166   ((name :initarg :name
 167          :initform "Generic Axis")
 168    (loweredge :initarg :loweredge
 169               :initform t)
 170    (name-face :initarg :name-face
 171               :initform 'bold)
 172    (labels-face :initarg :labels-face
 173                 :initform 'italic)
 174    (chart :initarg :chart
 175           :initform nil)
 176    )
 177   "Superclass used for display of an axis.")
 178
 179 (defclass chart-axis-range (chart-axis)
 180   ((bounds :initarg :bounds
 181            :initform '(0.0 . 50.0))
 182    )
 183   "Class used to display an axis defined by a range of values.")
 184
 185 (defclass chart-axis-names (chart-axis)
 186   ((items :initarg :items
 187           :initform nil)
 188    )
 189   "Class used to display an axis which represents different named items.")
 190
 191 (defclass chart-sequece ()
 192   ((data :initarg :data
 193          :initform nil)
 194    (name :initarg :name
 195          :initform "Data")
 196    )
 197   "Class used for all data in different charts.")
 198
 199 (defclass chart-bar (chart)
 200   ((direction :initarg :direction
 201               :initform vertical))
 202   "Subclass for bar charts (vertical or horizontal).")
 203
 204 (defmethod chart-draw ((c chart) &optional buff)
 205   "Start drawing a chart object C in optional BUFF.
 206 Erases current contents of buffer."
 207   (save-excursion
 208     (if buff (set-buffer buff))
 209     (erase-buffer)
 210     (insert (make-string 100 ?\n))
 211     ;; Start by displaying the axis
 212     (chart-draw-axis c)
 213     ;; Display title
 214     (chart-draw-title c)
 215     ;; Display data
 216     (message "Rendering chart...")
 217     (sit-for 0)
 218     (chart-draw-data c)
 219     ;; Display key
 220     ; (chart-draw-key c)
 221     (message "Rendering chart...done")
 222     ))
 223
 224 (defmethod chart-draw-title ((c chart))
 225   "Draw a title upon the chart.
 226 Argument C is the chart object."
 227   (chart-display-label (oref c title) 'horizontal 0 0 (window-width)
 228                        (oref c title-face)))
 229
 230 (defmethod chart-size-in-dir ((c chart) dir)
 231   "Return the physical size of chart C in direction DIR."
 232   (if (eq dir 'vertical)
 233       (oref c y-width)
 234     (oref c x-width)))
 235
 236 (defmethod chart-draw-axis ((c chart))
 237   "Draw axis into the current buffer defined by chart C."
 238   (let ((ymarg (oref c y-margin))
 239         (xmarg (oref c x-margin))
 240         (ylen (oref c y-width))
 241         (xlen (oref c x-width)))
 242     (chart-axis-draw (oref c y-axis) 'vertical ymarg
 243                      (if (oref (oref c y-axis) loweredge) nil xlen)
 244                      xmarg (+ xmarg ylen))
 245     (chart-axis-draw (oref c x-axis) 'horizontal xmarg
 246                      (if (oref (oref c x-axis) loweredge) nil ylen)
 247                      ymarg (+ ymarg xlen)))
 248   )
 249
 250 (defmethod chart-axis-draw ((a chart-axis) &optional dir margin zone start end)
 251   "Draw some axis for A in direction DIR with MARGIN in boundary.
 252 ZONE is a zone specification.
 253 START and END represent the boundary."
 254   (chart-draw-line dir (+ margin (if zone zone 0)) start end)
 255   (chart-display-label (oref a name) dir (if zone (+ zone margin 3)
 256                                            (if (eq dir 'horizontal)
 257                                                1 0))
 258                        start end (oref a name-face)))
 259
 260 (defmethod chart-translate-xpos ((c chart) x)
 261   "Translate in chart C the coordinate X into a screen column."
 262   (let ((range (oref (oref c x-axis) bounds)))
 263     (+ (oref c x-margin)
 264        (round (* (float (- x (car range)))
 265                  (/ (float (oref c x-width))
 266                     (float (- (cdr range) (car range))))))))
 267   )
 268
 269 (defmethod chart-translate-ypos ((c chart) y)
 270   "Translate in chart C the coordinate Y into a screen row."
 271   (let ((range (oref (oref c y-axis) bounds)))
 272     (+ (oref c x-margin)
 273        (- (oref c y-width)
 274           (round (* (float (- y (car range)))
 275                     (/ (float (oref c y-width))
 276                        (float (- (cdr range) (car range)))))))))
 277   )
 278
 279 (defmethod chart-axis-draw ((a chart-axis-range) &optional dir margin zone _start _end)
 280   "Draw axis information based upon a range to be spread along the edge.
 281 A is the chart to draw.  DIR is the direction.
 282 MARGIN, ZONE, START, and END specify restrictions in chart space."
 283   (call-next-method)
 284   ;; We prefer about 5 spaces between each value
 285   (let* ((i (car (oref a bounds)))
 286          (e (cdr (oref a bounds)))
 287          (z (if zone zone 0))
 288          (s nil)
 289          (rng (- e i))
 290          ;; want to jump by units of 5 spaces or so
 291          (j (/ rng (/  (chart-size-in-dir (oref a chart) dir) 4)))
 292          p1)
 293     (if (= j 0) (setq j 1))
 294     (while (<= i e)
 295       (setq s
 296             (cond ((> i 999999)
 297                    (format "%dM" (/ i 1000000)))
 298                   ((> i 999)
 299                    (format "%dK" (/ i 1000)))
 300                   (t
 301                    (format "%d" i))))
 302       (if (eq dir 'vertical)
 303           (let ((x (+ (+ margin z) (if (oref a loweredge)
 304                                        (- (length s)) 1))))
 305             (if (< x 1) (setq x 1))
 306             (chart-goto-xy x (chart-translate-ypos (oref a chart) i)))
 307         (chart-goto-xy (chart-translate-xpos (oref a chart) i)
 308                        (+ margin z (if (oref a loweredge) -1 1))))
 309       (setq p1 (point))
 310       (insert s)
 311       (chart-zap-chars (length s))
 312       (put-text-property p1 (point) 'face (oref a labels-face))
 313       (setq i (+ i j))))
 314 )
 315
 316 (defmethod chart-translate-namezone ((c chart) n)
 317   "Return a dot-pair representing a positional range for a name.
 318 The name in chart C of the Nth name resides.
 319 Automatically compensates for direction."
 320   (let* ((dir (oref c direction))
 321          (w (if (eq dir 'vertical) (oref c x-width) (oref c y-width)))
 322          (m (if (eq dir 'vertical) (oref c y-margin) (oref c x-margin)))
 323          (ns (length
 324               (oref (if (eq dir 'vertical) (oref c x-axis) (oref c y-axis))
 325                     items)))
 326          (lpn (/ (+ 1.0 (float w)) (float ns)))
 327          )
 328     (cons (+ m (round (* lpn (float n))))
 329           (+ m -1 (round (* lpn (+ 1.0 (float n))))))
 330     ))
 331
 332 (defmethod chart-axis-draw ((a chart-axis-names) &optional dir margin zone _start _end)
 333   "Draw axis information based upon A range to be spread along the edge.
 334 Optional argument DIR is the direction of the chart.
 335 Optional arguments MARGIN, ZONE, START and END specify boundaries of the drawing."
 336   (call-next-method)
 337   ;; We prefer about 5 spaces between each value
 338   (let* ((i 0)
 339          (s (oref a items))
 340          (z (if zone zone 0))
 341          (r nil)
 342          (p nil)
 343          (odd nil)
 344          p1)
 345     (while s
 346       (setq odd (= (% (length s) 2) 1))
 347       (setq r (chart-translate-namezone (oref a chart) i))
 348       (if (eq dir 'vertical)
 349           (setq p (/ (+ (car r) (cdr r)) 2))
 350         (setq p (- (+ (car r) (/ (- (cdr r) (car r)) 2))
 351                    (/ (length (car s)) 2))))
 352       (if (eq dir 'vertical)
 353           (let ((x (+ (+ margin z) (if (oref a loweredge)
 354                                        (- (length (car s)))
 355                                      (length (car s))))))
 356             (if (< x 1) (setq x 1))
 357             (if (> (length (car s)) (1- margin))
 358                 (setq x (+ x margin)))
 359             (chart-goto-xy x p))
 360         (chart-goto-xy p (+ (+ margin z) (if (oref a loweredge)
 361                                              (if odd -2 -1)
 362                                            (if odd 2 1)))))
 363       (setq p1 (point))
 364       (insert (car s))
 365       (chart-zap-chars (length (car s)))
 366       (put-text-property p1 (point) 'face (oref a labels-face))
 367       (setq i (+ i 1)
 368             s (cdr s))))
 369 )
 370
 371 (defmethod chart-draw-data ((c chart-bar))
 372   "Display the data available in a bar chart C."
 373   (let* ((data (oref c sequences))
 374          (dir (oref c direction))
 375          (odir (if (eq dir 'vertical) 'horizontal 'vertical))
 376         )
 377     (while data
 378       (if (stringp (car (oref (car data) data)))
 379           ;; skip string lists...
 380           nil
 381         ;; display number lists...
 382         (let ((i 0)
 383               (seq (oref (car data) data)))
 384           (while seq
 385             (let* ((rng (chart-translate-namezone c i))
 386                    (dp (if (eq dir 'vertical)
 387                            (chart-translate-ypos c (car seq))
 388                          (chart-translate-xpos c (car seq))))
 389                   (zp (if (eq dir 'vertical)
 390                           (chart-translate-ypos c 0)
 391                         (chart-translate-xpos c 0)))
 392                   (fc (if chart-face-list
 393                           (nth (% i (length chart-face-list)) chart-face-list)
 394                         'default))
 395                   )
 396               (if (< dp zp)
 397                   (progn
 398                     (chart-draw-line dir (car rng) dp zp)
 399                     (chart-draw-line dir (cdr rng) dp zp))
 400                 (chart-draw-line dir (car rng) zp (1+ dp))
 401                 (chart-draw-line dir (cdr rng) zp (1+ dp)))
 402               (if (= (car rng) (cdr rng)) nil
 403                 (chart-draw-line odir dp (1+ (car rng)) (cdr rng))
 404                 (chart-draw-line odir zp (car rng) (1+ (cdr rng))))
 405               (if (< dp zp)
 406                   (chart-deface-rectangle dir rng (cons dp zp) fc)
 407                 (chart-deface-rectangle dir rng (cons zp dp) fc))
 408               )
 409             ;; find the bounds, and chart it!
 410             ;; for now, only do one!
 411             (setq i (1+ i)
 412                   seq (cdr seq)))))
 413       (setq data (cdr data))))
 414   )
 415
 416 (defmethod chart-add-sequence ((c chart) &optional seq axis-label)
 417   "Add to chart object C the sequence object SEQ.
 418 If AXIS-LABEL, then the axis stored in C is updated with the bounds of SEQ,
 419 or is created with the bounds of SEQ."
 420   (if axis-label
 421       (let ((axis (eieio-oref c axis-label)))
 422         (if (stringp (car (oref seq data)))
 423             (let ((labels (oref seq data)))
 424               (if (not axis)
 425                   (setq axis (make-instance chart-axis-names
 426                                             :name (oref seq name)
 427                                             :items labels
 428                                             :chart c))
 429                 (oset axis items labels)))
 430           (let ((range (cons 0 1))
 431                 (l (oref seq data)))
 432             (if (not axis)
 433                 (setq axis (make-instance chart-axis-range
 434                                           :name (oref seq name)
 435                                           :chart c)))
 436             (while l
 437               (if (< (car l) (car range)) (setcar range (car l)))
 438               (if (> (car l) (cdr range)) (setcdr range (car l)))
 439               (setq l (cdr l)))
 440             (oset axis bounds range)))
 441         (if (eq axis-label 'x-axis) (oset axis loweredge nil))
 442         (eieio-oset c axis-label axis)
 443         ))
 444   (oset c sequences (append (oref c sequences) (list seq))))
 445
 446 ;;; Charting optimizers
 447
 448 (defmethod chart-trim ((c chart) max)
 449   "Trim all sequences in chart C to be at most MAX elements long."
 450   (let ((s (oref c sequences)))
 451     (while s
 452       (let ((sl (oref (car s) data)))
 453         (if (> (length sl) max)
 454             (setcdr (nthcdr (1- max) sl) nil)))
 455       (setq s (cdr s))))
 456   )
 457
 458 (defmethod chart-sort ((c chart) pred)
 459   "Sort the data in chart C using predicate PRED.
 460 See `chart-sort-matchlist' for more details."
 461   (let* ((sl (oref c sequences))
 462          (s1 (car sl))
 463          (s2 (car (cdr sl)))
 464          (s nil))
 465     (if (stringp (car (oref s1 data)))
 466         (progn
 467           (chart-sort-matchlist s1 s2 pred)
 468           (setq s (oref s1 data)))
 469       (if (stringp (car (oref s2 data)))
 470           (progn
 471             (chart-sort-matchlist s2 s1 pred)
 472             (setq s (oref s2 data)))
 473         (error "Sorting of chart %s not supported" (eieio-object-name c))))
 474     (if (eq (oref c direction) 'horizontal)
 475         (oset (oref c y-axis) items s)
 476       (oset (oref c x-axis) items s)
 477         ))
 478   )
 479
 480 (defun chart-sort-matchlist (namelst numlst pred)
 481   "Sort NAMELST and NUMLST (both sequence objects) based on predicate PRED.
 482 PRED should be the equivalent of '<, except it must expect two
 483 cons cells of the form (NAME . NUM).  See `sort' for more details."
 484   ;; 1 - create 1 list of cons cells
 485   (let ((newlist nil)
 486         (alst (oref namelst data))
 487         (ulst (oref numlst data)))
 488     (while alst
 489       ;; this is reversed, but were are sorting anyway
 490       (setq newlist (cons (cons (car alst) (car ulst)) newlist))
 491       (setq alst (cdr alst)
 492             ulst (cdr ulst)))
 493     ;; 2 - Run sort routine on it
 494     (setq newlist (sort newlist pred)
 495           alst nil
 496           ulst nil)
 497     ;; 3 - Separate the lists
 498     (while newlist
 499       (setq alst (cons (car (car newlist)) alst)
 500             ulst (cons (cdr (car newlist)) ulst))
 501       (setq newlist (cdr newlist)))
 502     ;; 4 - Store them back
 503     (oset namelst data (reverse alst))
 504     (oset numlst data (reverse ulst))))
 505
 506 ;;; Utilities
 507
 508 (defun chart-goto-xy (x y)
 509   "Move cursor to position X Y in buffer, and add spaces and CRs if needed."
 510   (let ((indent-tabs-mode nil)
 511         (num (progn (goto-char (point-min)) (forward-line y))))
 512     (if (and (= 0 num) (/= 0 (current-column))) (newline 1))
 513     (if (eobp) (newline num))
 514     (if (< x 0) (setq x 0))
 515     (if (< y 0) (setq y 0))
 516     ;; Now, a quicky column moveto/forceto method.
 517     (or (= (move-to-column x) x)
 518         (let ((p (point)))
 519           (indent-to x)
 520           (remove-text-properties p (point) '(face))))))
 521
 522 (defun chart-zap-chars (n)
 523   "Zap up to N chars without deleting EOLs."
 524   (if (not (eobp))
 525       (if (< n (- (point-at-eol) (point)))
 526           (delete-char n)
 527         (delete-region (point) (point-at-eol)))))
 528
 529 (defun chart-display-label (label dir zone start end &optional face)
 530   "Display LABEL in direction DIR in column/row ZONE between START and END.
 531 Optional argument FACE is the property we wish to place on this text."
 532   (if (eq dir 'horizontal)
 533       (let (p1)
 534         (chart-goto-xy (+ start (- (/ (- end start) 2) (/ (length label) 2)))
 535                        zone)
 536         (setq p1 (point))
 537         (insert label)
 538         (chart-zap-chars (length label))
 539         (put-text-property p1 (point) 'face face)
 540         )
 541     (let ((i 0)
 542           (stz (+ start (- (/ (- end start) 2) (/ (length label) 2)))))
 543       (while (< i (length label))
 544         (chart-goto-xy zone (+ stz i))
 545         (insert (aref label i))
 546         (chart-zap-chars 1)
 547         (put-text-property (1- (point)) (point) 'face face)
 548         (setq i (1+ i))))))
 549
 550 (defun chart-draw-line (dir zone start end)
 551   "Draw a line using line-drawing characters in direction DIR.
 552 Use column or row ZONE between START and END."
 553   (chart-display-label
 554    (make-string (- end start) (if (eq dir 'vertical) ?| ?\-))
 555    dir zone start end))
 556
 557 (defun chart-deface-rectangle (dir r1 r2 face)
 558   "Colorize a rectangle in direction DIR across range R1 by range R2.
 559 R1 and R2 are dotted pairs.  Colorize it with FACE."
 560   (let* ((range1 (if (eq dir 'vertical) r1 r2))
 561          (range2 (if (eq dir 'vertical) r2 r1))
 562          (y (car range2)))
 563     (while (<= y (cdr range2))
 564       (chart-goto-xy (car range1) y)
 565       (put-text-property (point) (+ (point) (1+ (- (cdr range1) (car range1))))
 566                          'face face)
 567       (setq y (1+ y)))))
 568
 569 ;;; Helpful `I don't want to learn eieio just now' washover functions
 570
 571 (defun chart-bar-quickie (dir title namelst nametitle numlst numtitle
 572                               &optional max sort-pred)
 573   "Wash over the complex EIEIO stuff and create a nice bar chart.
 574 Create it going in direction DIR ['horizontal 'vertical] with TITLE
 575 using a name sequence NAMELST labeled NAMETITLE with values NUMLST
 576 labeled NUMTITLE.
 577 Optional arguments:
 578 Set the chart's max element display to MAX, and sort lists with
 579 SORT-PRED if desired."
 580   (let ((nc (make-instance chart-bar
 581                            :title title
 582                            :key-label "8-m"  ; This is a text key pic
 583                            :direction dir
 584                            ))
 585         (iv (eq dir 'vertical)))
 586     (chart-add-sequence nc
 587                         (make-instance chart-sequece
 588                                        :data namelst
 589                                        :name nametitle)
 590                         (if iv 'x-axis 'y-axis))
 591     (chart-add-sequence nc
 592                         (make-instance chart-sequece
 593                                        :data numlst
 594                                        :name numtitle)
 595                         (if iv 'y-axis 'x-axis))
 596     (if sort-pred (chart-sort nc sort-pred))
 597     (if (integerp max) (chart-trim nc max))
 598     (switch-to-buffer (chart-new-buffer nc))
 599     (chart-draw nc)))
 600
 601 ;;; Test code
 602
 603 (defun chart-test-it-all ()
 604   "Test out various charting features."
 605   (interactive)
 606   (chart-bar-quickie 'vertical "Test Bar Chart"
 607                      '( "U1" "ME2" "C3" "B4" "QT" "EZ") "Items"
 608                      '( 5 -10 23 20 30 -3) "Values")
 609   )
 610
 611 ;;; Sample utility function
 612
 613 (defun chart-file-count (dir)
 614   "Draw a chart displaying the number of different file extensions in DIR."
 615   (interactive "DDirectory: ")
 616   (if (not (string-match "/$" dir))
 617       (setq dir (concat dir "/")))
 618   (message "Collecting statistics...")
 619   (let ((flst (directory-files dir nil nil t))
 620         (extlst (list "<dir>"))
 621         (cntlst (list 0)))
 622     (while flst
 623       (let* ((j (string-match "[^\\.]\\(\\.[a-zA-Z]+\\|~\\|#\\)$" (car flst)))
 624              (s (if (file-accessible-directory-p (concat dir (car flst)))
 625                     "<dir>"
 626                   (if j
 627                       (substring (car flst) (match-beginning 1) (match-end 1))
 628                     nil)))
 629              (m (member s extlst)))
 630         (if (not s) nil
 631           (if m
 632               (let ((cell (nthcdr (- (length extlst) (length m)) cntlst)))
 633                 (setcar cell (1+ (car cell))))
 634             (setq extlst (cons s extlst)
 635                   cntlst (cons 1 cntlst)))))
 636       (setq flst (cdr flst)))
 637     ;; Let's create the chart!
 638     (chart-bar-quickie 'vertical "Files Extension Distribution"
 639                        extlst "File Extensions"
 640                        cntlst "# of occurrences"
 641                        10
 642                        (lambda (a b) (> (cdr a) (cdr b))))
 643     ))
 644
 645 (defun chart-space-usage (d)
 646   "Display a top usage chart for directory D."
 647   (interactive "DDirectory: ")
 648   (message "Collecting statistics...")
 649   (let ((nmlst nil)
 650         (cntlst nil)
 651         (b (get-buffer-create " *du-tmp*")))
 652     (set-buffer b)
 653     (erase-buffer)
 654     (insert "cd " d ";du -sk * \n")
 655     (message "Running `cd %s;du -sk *'..." d)
 656     (call-process-region (point-min) (point-max) shell-file-name t
 657                          (current-buffer) nil)
 658     (goto-char (point-min))
 659     (message "Scanning output ...")
 660     (while (re-search-forward "^\\([0-9]+\\)[ \t]+\\([^ \n]+\\)$" nil t)
 661       (let* ((nam (buffer-substring (match-beginning 2) (match-end 2)))
 662              (num (buffer-substring (match-beginning 1) (match-end 1))))
 663         (setq nmlst (cons nam nmlst)
 664               ;; * 1000 to put it into bytes
 665               cntlst (cons (* (string-to-number num) 1000) cntlst))))
 666     (if (not nmlst)
 667         (error "No files found!"))
 668     (chart-bar-quickie 'vertical (format "Largest files in %s" d)
 669                        nmlst "File Name"
 670                        cntlst "File Size"
 671                        10
 672                        (lambda (a b) (> (cdr a) (cdr b))))
 673     ))
 674
 675 (defun chart-emacs-storage ()
 676   "Chart the current storage requirements of Emacs."
 677   (interactive)
 678   (let* ((data (garbage-collect)))
 679     ;; Let's create the chart!
 680     (chart-bar-quickie 'vertical "Emacs Runtime Storage Usage"
 681                        (mapcar (lambda (x) (symbol-name (car x))) data)
 682                        "Storage Items"
 683                        (mapcar (lambda (x) (* (nth 1 x) (nth 2 x)))
 684                                data)
 685                        "Bytes")))
 686
 687 (defun chart-emacs-lists ()
 688   "Chart out the size of various important lists."
 689   (interactive)
 690   (let* ((names '("buffers" "frames" "processes" "faces"))
 691          (nums (list (length (buffer-list))
 692                      (length (frame-list))
 693                      (length (process-list))
 694                      (length (face-list))
 695                      )))
 696     (if (fboundp 'x-display-list)
 697         (setq names (append names '("x-displays"))
 698               nums (append nums (list (length (x-display-list))))))
 699     ;; Let's create the chart!
 700     (chart-bar-quickie 'vertical "Emacs List Size Chart"
 701                        names "Various Lists"
 702                        nums "Objects")))
 703
 704 (defun chart-rmail-from ()
 705   "If we are in an rmail summary buffer, then chart out the froms."
 706   (interactive)
 707   (if (not (eq major-mode 'rmail-summary-mode))
 708       (error "You must invoke chart-rmail-from in an rmail summary buffer"))
 709   (let ((nmlst nil)
 710         (cntlst nil))
 711     (save-excursion
 712       (goto-char (point-min))
 713       (while (re-search-forward "\\-[A-Z][a-z][a-z] +\\(\\w+\\)@\\w+" nil t)
 714         (let* ((nam (buffer-substring (match-beginning 1) (match-end 1)))
 715                (m (member nam nmlst)))
 716           (message "Scanned username %s" nam)
 717           (if m
 718               (let ((cell (nthcdr (- (length nmlst) (length m)) cntlst)))
 719                 (setcar cell (1+ (car cell))))
 720             (setq nmlst (cons nam nmlst)
 721                   cntlst (cons 1 cntlst))))))
 722     (chart-bar-quickie 'vertical "Username Occurrence in RMAIL box"
 723                        nmlst "User Names"
 724                        cntlst "# of occurrences"
 725                        10
 726                        (lambda (a b) (> (cdr a) (cdr b))))
 727     ))
 728
 729
 730 (provide 'chart)
 731
 732 ;;; chart.el ends here