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1 ;;; column.el --- display line and column in the mode line
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2
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3 ;; Copyright (C) 1993 Per Abrahamsen.
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4 ;; Copyright abandoned. This file is donated to the public domain.
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5
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6 ;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
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7 ;; Hacked for XEmacs by Richard Lee <rlee@vienna.itd.sterling.com>
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8 ;; Version: 0.2
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9 ;; Bogus-Bureaucratic-Cruft: How 'bout ESR and the LCD people agreed
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10 ;; on a common format?
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11
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12 ;;; Synched up with: Not in FSF.
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13
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14 ;;; Commentary:
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15
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16 ;; LCD Archive Entry:
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17 ;; column|Per Abrahamsen|abraham@iesd.auc.dk|
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18 ;; Display line and column in the mode line|
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19 ;; 1993-12-31|0.2|~/misc/column.el.Z|
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20
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21 ;; Requires FSF Emacs 19. ***** or Lucid Emacs 19.6+ -- Richard Lee
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22
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23 ;;; Change Log:
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24 ;;
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25 ;; Tue Jan 04 19:51:15 1994 Richard Lee *****
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26 ;; * Hacks for Lemacs:
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27 ;; changed display-column-after from ")%--" to ")%----"
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28 ;; defined current-line (function and variable)
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29 ;; changed display-column-format to use current-line instead of %l
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30 ;; Fri Dec 31 13:46:41 1993
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31 ;; * Change mode-line-format directly instead of using a minor mode.
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32 ;; Thu Dec 16 14:57:15 1993
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33 ;; * Removed (require 'lucid) as unnecessary.
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34 ;; Fri Aug 13 02:06:18 1993 Per Abrahamsen
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35 ;; * Made current-column buffer local.
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36 ;; Tue Aug 10 10:00:00 1993 Per Abrahamsen
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37 ;; * Created.
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38
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39 ;; This version should display column and line number the same place as
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40 ;; line-number-mode. Activate with
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41
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42 ;; M-x display-column-mode RET
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43
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44 ;; For FSF Emacs 19 only. You can get line+.el or linenumber.el from the
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45 ;; emacs lisp archive if you have another version of Emacs. Not tested.
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46
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47 ;;; Code:
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48
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49 ;; String containing current column as last evaluated.
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50 (defvar current-column "0")
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51 (defvar current-line "0")
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52 (make-variable-buffer-local 'current-column)
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53 (make-variable-buffer-local 'current-line)
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54
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55 ;; Returns the vertical position of point _relative to beginning of buffer_
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56 ;; (as opposed to the current-line example in the gnu-emacs 19 info page on
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57 ;; Text Lines, which does it relative to top of screen.) ***** -- Richard Lee
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58 ;; ben: lines begin at 1, not 0!
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59 (defun current-line ()
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60 "Return the vertical position of point in the selected window.
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61 First line in the buffer is 1."
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62 (1+ (+ (count-lines 1 (point))
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63 (if (= (current-column) 0) 1 0)
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64 -1)))
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65
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66 ;; Function updating the string containing the current column.
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67 (defvar update-column-function
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68 (function (lambda ()
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69 (setq current-column (int-to-string (current-column)))
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70 (setq current-line (int-to-string (current-line)))
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71 (set-buffer-modified-p (buffer-modified-p)))))
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72
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73 (defvar display-column-mode nil
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74 "Show current column and line in mode line if non-nil.")
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75
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76 (defvar display-column-format '(current-line "/" current-column "--")
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77 "Format for displaying the line and column in the mode line.")
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78
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79 ;; Entry for column mode in mode line.
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80 (defconst display-column-entry
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81 (list 'display-column-mode (cons "" display-column-format)))
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82
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83 (defvar display-column-after ")%]----"
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84 "Display column after this element in the mode line.")
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85
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86 ;; Add display-column-format to mode-line-format after display-column-after.
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87 (or (member display-column-entry mode-line-format)
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88 (let ((entry (member display-column-after mode-line-format)))
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89 (setcdr entry (cons display-column-entry (cdr entry)))))
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90
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91 (defun remove (it list)
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92 (cond ((null list) nil)
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93 ((eq it (car list)) (cdr list))
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94 (t (setcdr list (remove it (cdr list))) list)))
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95
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96 ;;;###autoload
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97 (defun display-column-mode (&optional arg)
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98 "Toggle display column mode.
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99 With prefix arg, turn display column mode on iff arg is positive.
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100
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101 When display column mode is on, the current column and line number are
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102 displayed in the mode line."
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103 (interactive "P")
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104 (if (or (and (null arg) display-column-mode)
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105 (<= (prefix-numeric-value arg) 0))
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106 ;; Turn it off
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107 (if display-column-mode
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108 (progn
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109 (remove-hook 'post-command-hook update-column-function)
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110 (setq display-column-mode nil)
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111 (set-buffer-modified-p (buffer-modified-p))))
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112 ;;Turn it on
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113 (if display-column-mode
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114 ()
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115 (add-hook 'post-command-hook update-column-function)
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116 (setq display-column-mode t))))
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117
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118 (provide 'column)
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119
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120 ;;; column.el ends here
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