;;; mh-funcs.el --- MH-E functions not everyone will use right away

;; Copyright (C) 1993, 1995,
;;  2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.

;; Author: Bill Wohler <wohler@newt.com>
;; Maintainer: Bill Wohler <wohler@newt.com>
;; Keywords: mail
;; See: mh-e.el

;; 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 2, 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, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Internal support for MH-E package.
;; Putting these functions in a separate file lets MH-E start up faster,
;; since less Lisp code needs to be loaded all at once.

;;; Change Log:

;;; Code:

(eval-when-compile (require 'mh-acros))
(mh-require-cl)
(require 'mh-e)

;;; Scan Line Formats

(defvar mh-note-copied "C"
  "Messages that have been copied are marked by this character.")

(defvar mh-note-printed "P"
  "Messages that have been printed are marked by this character.")

;;; Functions

;;;###mh-autoload
(defun mh-burst-digest ()
  "Break up digest into separate messages\\<mh-folder-mode-map>.

This command uses the MH command \"burst\" to break out each message in the
digest into its own message. Using this command, you can quickly delete
unwanted messages, like this: Once the digest is split up, toggle out of
MH-Folder Show mode with \\[mh-toggle-showing] so that the scan lines fill the
screen and messages aren't displayed. Then use \\[mh-delete-msg] to quickly
delete messages that you don't want to read (based on the \"Subject:\" header
field). You can also burst the digest to reply directly to the people who
posted the messages in the digest. One problem you may encounter is that the
\"From:\" header fields are preceded with a \">\" so that your reply can't
create the \"To:\" field correctly. In this case, you must correct the \"To:\"
field yourself."
  (interactive)
  (let ((digest (mh-get-msg-num t)))
    (mh-process-or-undo-commands mh-current-folder)
    (mh-set-folder-modified-p t)        ; lock folder while bursting
    (message "Bursting digest...")
    (mh-exec-cmd "burst" mh-current-folder digest "-inplace")
    (with-mh-folder-updating (t)
      (beginning-of-line)
      (delete-region (point) (point-max)))
    (mh-regenerate-headers (format "%d-last" digest) t)
    (mh-goto-cur-msg)
    (message "Bursting digest...done")))

;;;###mh-autoload
(defun mh-copy-msg (range folder)
  "Copy RANGE to FOLDER\\<mh-folder-mode-map>.

If you wish to copy a message to another folder, you can use this command
\(see the \"-link\" argument to \"refile\"). Like the command
\\[mh-refile-msg], this command prompts you for the name of the target folder
and you can specify a range. Note that unlike the command \\[mh-refile-msg],
the copy takes place immediately. The original copy remains in the current
folder.

Check the documentation of `mh-interactive-range' to see how RANGE is read in
interactive use."
  (interactive (list (mh-interactive-range "Copy")
                     (mh-prompt-for-folder "Copy to" "" t)))
  (let ((msg-list (let ((result ()))
                    (mh-iterate-on-range msg range
                      (mh-notate nil mh-note-copied mh-cmd-note)
                      (push msg result))
                    result)))
    (mh-exec-cmd "refile" (mh-coalesce-msg-list msg-list)
                 "-link" "-src" mh-current-folder folder)))

;;;###mh-autoload
(defun mh-kill-folder ()
  "Remove the current folder and all included messages.
Removes all of the messages (files) within the specified current folder,
and then removes the folder (directory) itself.
The value of `mh-kill-folder-suppress-prompt-hook' is a list of functions to
be called, with no arguments, which should return a value of non-nil if
verification is not desired."
  (interactive)
  (if (or (run-hook-with-args-until-success
           'mh-kill-folder-suppress-prompt-hook)
          (yes-or-no-p (format "Remove folder %s (and all included messages)? "
                               mh-current-folder)))
      (let ((folder mh-current-folder)
            (window-config mh-previous-window-config))
        (mh-set-folder-modified-p t)    ; lock folder to kill it
        (mh-exec-cmd-daemon "rmf" 'mh-rmf-daemon folder)
        (when (boundp 'mh-speed-folder-map)
          (mh-speed-invalidate-map folder))
        (mh-remove-from-sub-folders-cache folder)
        (mh-set-folder-modified-p nil)  ; so kill-buffer doesn't complain
        (if (and mh-show-buffer (get-buffer mh-show-buffer))
            (kill-buffer mh-show-buffer))
        (if (get-buffer folder)
            (kill-buffer folder))
        (when window-config
          (set-window-configuration window-config))
        (message "Folder %s removed" folder))
    (message "Folder not removed")))

(defun mh-rmf-daemon (process output)
  "The rmf PROCESS puts OUTPUT in temporary buffer.
Display the results only if something went wrong."
  (set-buffer (get-buffer-create mh-temp-buffer))
  (insert-before-markers output)
  (when (save-excursion
          (goto-char (point-min))
          (re-search-forward "^rmf: " (point-max) t))
    (display-buffer mh-temp-buffer)))

;; Avoid compiler warning...
(defvar view-exit-action)

;;;###mh-autoload
(defun mh-list-folders ()
  "List mail folders."
  (interactive)
  (let ((temp-buffer mh-folders-buffer))
    (with-output-to-temp-buffer temp-buffer
      (save-excursion
        (set-buffer temp-buffer)
        (erase-buffer)
        (message "Listing folders...")
        (mh-exec-cmd-output "folders" t (if mh-recursive-folders-flag
                                            "-recurse"
                                          "-norecurse"))
        (goto-char (point-min))
        (view-mode-enter)
        (setq view-exit-action 'kill-buffer)
        (message "Listing folders...done")))))

;;;###mh-autoload
(defun mh-pack-folder (range)
  "Pack folder\\<mh-folder-mode-map>.

This command packs the folder, removing gaps from the numbering sequence. If
you don't want to rescan the entire folder afterward, this command will accept
a RANGE. Check the documentation of `mh-interactive-range' to see how RANGE is
read in interactive use.

This command will ask if you want to process refiles or deletes first and then
either run \\[mh-execute-commands] for you or undo the pending refiles and
deletes, which are lost."
  (interactive (list (if current-prefix-arg
                         (mh-read-range "Scan" mh-current-folder t nil t
                                        mh-interpret-number-as-range-flag)
                       '("all"))))
  (let ((threaded-flag (memq 'unthread mh-view-ops)))
    (mh-pack-folder-1 range)
    (mh-goto-cur-msg)
    (when mh-index-data
      (mh-index-update-maps mh-current-folder))
    (cond (threaded-flag (mh-toggle-threads))
          (mh-index-data (mh-index-insert-folder-headers))))
  (message "Packing folder...done"))

(defun mh-pack-folder-1 (range)
  "Close and pack the current folder.

Display RANGE after packing, or the entire folder if RANGE is nil."
  (mh-process-or-undo-commands mh-current-folder)
  (message "Packing folder...")
  (mh-set-folder-modified-p t)          ; lock folder while packing
  (save-excursion
    (mh-exec-cmd-quiet t "folder" mh-current-folder "-pack"
                       "-norecurse" "-fast"))
  (mh-reset-threads-and-narrowing)
  (mh-regenerate-headers range))

;;;###mh-autoload
(defun mh-pipe-msg (command include-header)
  "Pipe message through shell command COMMAND.

You are prompted for the Unix command through which you wish to run your
message. If you give an argument INCLUDE-HEADER to this command, the message
header is included in the text passed to the command."
  (interactive
   (list (read-string "Shell command on message: ") current-prefix-arg))
  (let ((msg-file-to-pipe (mh-msg-filename (mh-get-msg-num t)))
        (message-directory default-directory))
    (save-excursion
      (set-buffer (get-buffer-create mh-temp-buffer))
      (erase-buffer)
      (insert-file-contents msg-file-to-pipe)
      (goto-char (point-min))
      (if (not include-header) (search-forward "\n\n"))
      (let ((default-directory message-directory))
        (shell-command-on-region (point) (point-max) command nil)))))

;;;###mh-autoload
(defun mh-page-digest ()
  "Display next message in digest."
  (interactive)
  (mh-in-show-buffer (mh-show-buffer)
    ;; Go to top of screen (in case user moved point).
    (move-to-window-line 0)
    (let ((case-fold-search nil))
      ;; Search for blank line and then for From:
      (or (and (search-forward "\n\n" nil t)
               (re-search-forward "^From:" nil t))
          (error "No more messages in digest")))
    ;; Go back to previous blank line, then forward to the first non-blank.
    (search-backward "\n\n" nil t)
    (forward-line 2)
    (mh-recenter 0)))

;;;###mh-autoload
(defun mh-page-digest-backwards ()
  "Display previous message in digest."
  (interactive)
  (mh-in-show-buffer (mh-show-buffer)
    ;; Go to top of screen (in case user moved point).
    (move-to-window-line 0)
    (let ((case-fold-search nil))
      (beginning-of-line)
      (or (and (search-backward "\n\n" nil t)
               (re-search-backward "^From:" nil t))
          (error "No previous message in digest")))
    ;; Go back to previous blank line, then forward to the first non-blank.
    (if (search-backward "\n\n" nil t)
        (forward-line 2))
    (mh-recenter 0)))

;;;###mh-autoload
(defun mh-sort-folder (&optional extra-args)
  "Sort the messages in the current folder by date.
Calls the MH program sortm to do the work.
The arguments in the list `mh-sortm-args' are passed to sortm if the optional
argument EXTRA-ARGS is given."
  (interactive "P")
  (mh-process-or-undo-commands mh-current-folder)
  (setq mh-next-direction 'forward)
  (mh-set-folder-modified-p t)          ; lock folder while sorting
  (message "Sorting folder...")
  (let ((threaded-flag (memq 'unthread mh-view-ops)))
    (mh-exec-cmd "sortm" mh-current-folder (if extra-args mh-sortm-args))
    (when mh-index-data
      (mh-index-update-maps mh-current-folder))
    (message "Sorting folder...done")
    (mh-scan-folder mh-current-folder "all")
    (cond (threaded-flag (mh-toggle-threads))
          (mh-index-data (mh-index-insert-folder-headers)))))

;;;###mh-autoload
(defun mh-undo-folder ()
  "Undo all pending deletes and refiles in current folder."
  (interactive)
  (cond ((or mh-do-not-confirm-flag
             (yes-or-no-p "Undo all commands in folder? "))
         (setq mh-delete-list nil
               mh-refile-list nil
               mh-seq-list nil
               mh-next-direction 'forward)
         (with-mh-folder-updating (nil)
           (mh-remove-all-notation)))
        (t
         (message "Commands not undone"))))

;;;###mh-autoload
(defun mh-store-msg (directory)
  "Unpack message created with `uudecode' or `shar'.

The default DIRECTORY for extraction is the current directory; however, you
have a chance to specify a different extraction directory. The next time you
use this command, the default directory is the last directory you used. If you
would like to change the initial default directory, customize the option
`mh-store-default-directory'."
  (interactive (list (let ((udir (or mh-store-default-directory
                                     default-directory)))
                       (read-file-name "Store message in directory: "
                                       udir udir nil))))
  (let ((msg-file-to-store (mh-msg-filename (mh-get-msg-num t))))
    (save-excursion
      (set-buffer (get-buffer-create mh-temp-buffer))
      (erase-buffer)
      (insert-file-contents msg-file-to-store)
      (mh-store-buffer directory))))

;;;###mh-autoload
(defun mh-store-buffer (directory)
  "Store the file(s) contained in the current buffer into DIRECTORY.
The buffer can contain a shar file or uuencoded file.
Default directory is the last directory used, or initially the value of
`mh-store-default-directory' or the current directory."
  (interactive (list (let ((udir (or mh-store-default-directory
                                     default-directory)))
                       (read-file-name "Store buffer in directory: "
                                       udir udir nil))))
  (let ((store-directory (expand-file-name directory))
        (sh-start (save-excursion
                    (goto-char (point-min))
                    (if (re-search-forward
                         "^#![ \t]*/bin/sh\\|^#\\|^: " nil t)
                        (progn
                          ;; The "cut here" pattern was removed from above
                          ;; because it seemed to hurt more than help.
                          ;; But keep this to make it easier to put it back.
                          (if (looking-at "^[^a-z0-9\"]*cut here\\b")
                              (forward-line 1))
                          (beginning-of-line)
                          (if (looking-at "^[#:]....+\n\\( ?\n\\)?end$")
                              nil       ;most likely end of a uuencode
                            (point))))))
        (command "sh")
        (uudecode-filename "(unknown filename)")
        log-begin)
    (if (not sh-start)
        (save-excursion
          (goto-char (point-min))
          (if (re-search-forward "^begin [0-7]+ " nil t)
              (setq uudecode-filename
                    (buffer-substring (point)
                                      (progn (end-of-line) (point)))))))
    (save-excursion
      (set-buffer (get-buffer-create mh-log-buffer))
      (setq log-begin (mh-truncate-log-buffer))
      (if (not (file-directory-p store-directory))
          (progn
            (insert "mkdir " directory "\n")
            (call-process "mkdir" nil mh-log-buffer t store-directory)))
      (insert "cd " directory "\n")
      (setq mh-store-default-directory directory)
      (if (not sh-start)
          (progn
            (setq command "uudecode")
            (insert uudecode-filename " being uudecoded...\n"))))
    (set-window-start (display-buffer mh-log-buffer) log-begin) ;watch progress
    (let ((default-directory (file-name-as-directory store-directory)))
      (if (equal (call-process-region sh-start (point-max) command
                                      nil mh-log-buffer t)
                 0)
          (save-excursion
            (set-buffer mh-log-buffer)
            (insert "\n(mh-store finished)\n"))
        (error "Error occurred during execution of %s" command)))))



;;; Help Functions

;;;###mh-autoload
(defun mh-ephem-message (string)
  "Display STRING in the minibuffer momentarily."
  (message "%s" string)
  (sit-for 5)
  (message ""))

;;;###mh-autoload
(defun mh-help ()
  "Display cheat sheet for the MH-E commands."
  (interactive)
  (with-electric-help
   (function
    (lambda ()
      (insert
       (substitute-command-keys
        (mapconcat 'identity (cdr (assoc nil mh-help-messages)) ""))))
    mh-help-buffer)))

;;;###mh-autoload
(defun mh-prefix-help ()
  "Display cheat sheet for the commands of the current prefix in minibuffer."
  (interactive)
  ;; We got here because the user pressed a `?', but he pressed a prefix key
  ;; before that. Since the the key vector starts at index 0, the index of the
  ;; last keystroke is length-1 and thus the second to last keystroke is at
  ;; length-2. We use that information to obtain a suitable prefix character
  ;; from the recent keys.
  (let* ((keys (recent-keys))
         (prefix-char (elt keys (- (length keys) 2))))
    (with-electric-help
     (function
      (lambda ()
        (insert
         (substitute-command-keys
          (mapconcat 'identity
                     (cdr (assoc prefix-char mh-help-messages)) "")))))
     mh-help-buffer)))

(provide 'mh-funcs)

;;; Local Variables:
;;; indent-tabs-mode: nil
;;; sentence-end-double-space: nil
;;; End:

;;; arch-tag: 1936c4f1-4843-438e-bc4b-a63bb75a7762
;;; mh-funcs.el ends here