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;;; add-log.el --- change log maintenance commands for Emacs

;; Copyright (C) 1985-1991 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs 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 1, or (at your option)
;; any later version.

;; GNU Emacs 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, 675 Mass Ave, Cambridge, MA 02139, USA.


;;;###autoload
(defvar change-log-default-name nil
  "*Name of a change log file for \\[add-change-log-entry].")

(defun change-log-name ()
  (or change-log-default-name
      (if (eq system-type 'vax-vms) "$CHANGE_LOG$.TXT" "ChangeLog")))

(defun prompt-for-change-log-name ()
  "Prompt for a change log name."
  (let ((default (change-log-name)))
    (expand-file-name
     (read-file-name (format "Log file (default %s): " default)
		     nil default))))

;;;###autoload
(defun add-change-log-entry (&optional whoami file-name other-window)
  "Find change log file and add an entry for today.
Optional arg (interactive prefix) non-nil means prompt for user name and site.
Second arg is file name of change log.  If nil, uses `change-log-default-name'.
Third arg OTHER-WINDOW non-nil means visit in other window."
  (interactive (list current-prefix-arg
		     (prompt-for-change-log-name)))
  (let* ((full-name (if whoami
			(read-input "Full name: " (user-full-name))
		      (user-full-name)))
	 ;; Note that some sites have room and phone number fields in
	 ;; full name which look silly when inserted.  Rather than do
	 ;; anything about that here, let user give prefix argument so that
	 ;; s/he can edit the full name field in prompter if s/he wants.
	 (login-name (if whoami
			 (read-input "Login name: " (user-login-name))
		       (user-login-name)))
	 (site-name (if whoami
			(read-input "Site name: " (system-name))
		      (system-name))))
    (or file-name
	(setq file-name (or change-log-default-name
			    default-directory)))
    (if (file-directory-p file-name)
	(setq file-name (concat (file-name-as-directory file-name)
				(change-log-name))))
    (set (make-local-variable 'change-log-default-name) file-name)
    (if (and other-window (not (equal file-name buffer-file-name)))
	(find-file-other-window file-name)
      (find-file file-name))
    (undo-boundary)
    (goto-char (point-min))
    (if (not (and (looking-at (substring (current-time-string) 0 10))
		  (looking-at (concat ".* " full-name "  (" login-name "@"))))
	(progn (insert (current-time-string)
		       "  " full-name
		       "  (" login-name
		       "@" site-name ")\n\n")))
    (goto-char (point-min))
    (forward-line 1)
    (while (looking-at "\\sW")
      (forward-line 1))
    (delete-region (point)
		   (progn
		     (skip-chars-backward "\n")
		     (point)))
    (open-line 3)
    (forward-line 2)
    (indent-to left-margin)
    (insert "* ")))

;;;###autoload
(define-key ctl-x-4-map "a" 'add-change-log-entry-other-window)

;;;###autoload
(defun add-change-log-entry-other-window (&optional whoami file-name)
  "Find change log file in other window and add an entry for today.
First arg (interactive prefix) non-nil means prompt for user name and site.
Second arg is file name of change log.
Interactively, with a prefix argument, the file name is prompted for."
  (interactive (if current-prefix-arg
		   (list current-prefix-arg
			 (prompt-for-change-log-name))))
  (add-change-log-entry whoami file-name t))

;;; add-log.el ends here