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+;;; mh-seq --- mh-e sequences support
+;; Time-stamp: <93/12/02 09:36:09 gildea>
+
+;; Copyright 1993 Free Software Foundation, Inc.
+
+;; This file is part of mh-e.
+
+;; mh-e 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.
+
+;; mh-e 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 mh-e; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Internal support for mh-e package.
+
+;;; Code:
+
+(provide 'mh-seq)
+(require 'mh-e)
+
+(defvar mh-last-seq-used nil
+  "Name of the sequence to which a message was last added.")
+
+
+(defun mh-delete-seq (seq)
+  "Delete the SEQUENCE."
+  (interactive (list (mh-read-seq-default "Delete" t)))
+  (mh-map-to-seq-msgs 'mh-notate-if-in-one-seq seq ?  (1+ mh-cmd-note) seq)
+  (mh-undefine-sequence seq "all")
+  (mh-delete-seq-locally seq))
+
+
+(defun mh-list-sequences (folder)
+  "List the sequences defined in FOLDER."
+  (interactive (list (mh-prompt-for-folder "List sequences in"
+					   mh-current-folder t)))
+  (let ((temp-buffer " *mh-temp*")
+	(seq-list mh-seq-list))
+    (with-output-to-temp-buffer temp-buffer
+      (save-excursion
+	(set-buffer temp-buffer)
+	(erase-buffer)
+	(message "Listing sequences ...")
+	(insert "Sequences in folder " folder ":\n")
+	(while seq-list
+	  (let ((name (mh-seq-name (car seq-list)))
+		(sorted-seq-msgs
+		 (sort (copy-sequence (mh-seq-msgs (car seq-list))) '<))
+		(last-col (- (window-width) 4))
+		name-spec)
+	    (insert (setq name-spec (format "%20s:" name)))
+	    (while sorted-seq-msgs
+	      (if (> (current-column) last-col)
+		  (progn
+		    (insert "\n")
+		    (move-to-column (length name-spec))))
+	      (insert (format " %s" (car sorted-seq-msgs)))
+	      (setq sorted-seq-msgs (cdr sorted-seq-msgs)))
+	    (insert "\n"))
+	  (setq seq-list (cdr seq-list)))
+	(goto-char (point-min))
+	(message "Listing sequences...done")))))
+
+
+(defun mh-msg-is-in-seq (msg)
+  "Display the sequences that contain MESSAGE (default: displayed message)."
+  (interactive (list (mh-get-msg-num t)))
+  (message "Message %d is in sequences: %s"
+	   msg
+	   (mapconcat 'concat
+		      (mh-list-to-string (mh-seq-containing-msg msg))
+		      " ")))
+
+
+(defun mh-narrow-to-seq (seq)
+  "Restrict display of this folder to just messages in a sequence.
+Reads which sequence.\\<mh-folder-mode-map>  Use \\[mh-widen] to undo this command."
+  (interactive (list (mh-read-seq "Narrow to" t)))
+  (let ((eob (point-max)))
+    (with-mh-folder-updating (t)
+      (cond ((mh-seq-to-msgs seq)
+	     (mh-copy-seq-to-point seq eob)
+	     (narrow-to-region eob (point-max))
+	     (mh-make-folder-mode-line (symbol-name seq))
+	     (mh-recenter nil)
+	     (setq mh-narrowed-to-seq seq))
+	    (t
+	     (error "No messages in sequence `%s'" (symbol-name seq)))))))
+
+
+(defun mh-put-msg-in-seq (msg-or-seq to)
+  "Add MESSAGE(s) (default: displayed message) to SEQUENCE.
+If optional prefix argument provided, then prompt for the message sequence."
+  (interactive (list (if current-prefix-arg
+			 (mh-read-seq-default "Add messages from" t)
+		         (mh-get-msg-num t))
+		     (mh-read-seq-default "Add to" nil)))
+  (setq mh-last-seq-used to)
+  (mh-add-msgs-to-seq (if (numberp msg-or-seq)
+			  msg-or-seq
+			  (mh-seq-to-msgs msg-or-seq))
+		      to))
+
+
+(defun mh-widen ()
+  "Remove restrictions from current folder, thereby showing all messages."
+  (interactive)
+  (if mh-narrowed-to-seq
+      (with-mh-folder-updating (t)
+	(delete-region (point-min) (point-max))
+	(widen)
+	(mh-make-folder-mode-line)))
+  (setq mh-narrowed-to-seq nil))
+
+
+
+;;; Commands to manipulate sequences.  Sequences are stored in an alist
+;;; of the form:
+;;;	((seq-name msgs ...) (seq-name msgs ...) ...)
+
+
+(defun mh-read-seq-default (prompt not-empty)
+  ;; Read and return sequence name with default narrowed or previous sequence.
+  (mh-read-seq prompt not-empty (or mh-narrowed-to-seq mh-last-seq-used)))
+
+
+(defun mh-read-seq (prompt not-empty &optional default)
+  ;; Read and return a sequence name.  Prompt with PROMPT, raise an error
+  ;; if the sequence is empty and the NOT-EMPTY flag is non-nil, and supply
+  ;; an optional DEFAULT sequence.
+  ;; A reply of '%' defaults to the first sequence containing the current
+  ;; message.
+  (let* ((input (completing-read (format "%s %s %s" prompt "sequence:"
+					 (if default
+					     (format "[%s] " default)
+					     ""))
+				 (mh-seq-names mh-seq-list)))
+	 (seq (cond ((equal input "%") (mh-msg-to-seq (mh-get-msg-num t)))
+		    ((equal input "") default)
+		    (t (intern input))))
+	 (msgs (mh-seq-to-msgs seq)))
+    (if (and (null msgs) not-empty)
+	(error (format "No messages in sequence `%s'" seq)))
+    seq))
+
+
+(defun mh-msg-to-seq (msg)
+  ;; Given a MESSAGE number, return the first sequence in which it occurs.
+  (car (mh-seq-containing-msg msg)))
+
+
+(defun mh-seq-names (seq-list)
+  ;; Return an alist containing the names of the SEQUENCES.
+  (mapcar (function (lambda (entry) (list (symbol-name (mh-seq-name entry)))))
+	  seq-list))
+
+
+(defun mh-rename-seq (seq new-name)
+  "Rename a SEQUENCE to have a new NAME."
+  (interactive (list (mh-read-seq "Old" t)
+		     (intern (read-string "New sequence name: "))))
+  (let ((old-seq (mh-find-seq seq)))
+    (or old-seq
+	(error "Sequence %s does not exist" seq))
+    ;; create new seq first, since it might raise an error.
+    (mh-define-sequence new-name (mh-seq-msgs old-seq))
+    (mh-undefine-sequence seq (mh-seq-msgs old-seq))
+    (rplaca old-seq new-name)))
+
+
+(defun mh-map-to-seq-msgs (func seq &rest args)
+  ;; Invoke the FUNCTION at each message in the SEQUENCE, passing the
+  ;; remaining ARGS as arguments.
+  (save-excursion
+    (let ((msgs (mh-seq-to-msgs seq)))
+      (while msgs
+	(if (mh-goto-msg (car msgs) t t)
+	    (apply func (car msgs) args))
+	(setq msgs (cdr msgs))))))
+
+
+(defun mh-notate-seq (seq notation offset)
+  ;; Mark the scan listing of all messages in the SEQUENCE with the CHARACTER
+  ;; at the given OFFSET from the beginning of the listing line.
+  (mh-map-to-seq-msgs 'mh-notate seq notation offset))
+
+
+(defun mh-add-to-sequence (seq msgs)
+  ;; Add to a SEQUENCE each message the list of MSGS.
+  (if (not (mh-folder-name-p seq))
+      (if msgs
+	  (apply 'mh-exec-cmd "mark" mh-current-folder "-add"
+		 "-sequence" (symbol-name seq)
+		 msgs))))
+
+
+(defun mh-copy-seq-to-point (seq location)
+  ;; Copy the scan listing of the messages in SEQUENCE to after the point
+  ;; LOCATION in the current buffer.
+  (mh-map-to-seq-msgs 'mh-copy-line-to-point seq location))
+
+
+(defun mh-copy-line-to-point (msg location)
+  ;; Copy the current line to the LOCATION in the current buffer.
+  (beginning-of-line)
+  (let ((beginning-of-line (point)))
+    (forward-line 1)
+    (copy-region-as-kill beginning-of-line (point))
+    (goto-char location)
+    (yank)
+    (goto-char beginning-of-line)))
+