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- ;;; mh-utils.el --- mh-e code needed for both sending and reading
- ;; Time-stamp: <94/04/11 20:56:35 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:
-
- ;;; Set for local environment:
- ;;; mh-progs and mh-lib used to be set in paths.el, which tried to
- ;;; figure out at build time which of several possible directories MH
- ;;; was installed into. But if you installed MH after building Emacs,
- ;;; this would almost certainly be wrong, so now we do it at run time.
-
- (defvar mh-progs nil
- "Directory containing MH commands, such as inc, repl, and rmm.")
-
- (defvar mh-lib nil
- "Directory containing the MH library.
- This directory contains, among other things,
- the mhl program and the components file.")
-
- ;;; User preferences:
-
- (defvar mh-auto-folder-collect t
- "*Whether to start collecting MH folder names immediately in the background.
- Non-nil means start a background process collecting the names of all
- folders as soon as mh-e is loaded.")
-
- (defvar mh-recursive-folders nil
- "*If non-nil, then commands which operate on folders do so recursively.")
-
- (defvar mh-clean-message-header nil
- "*Non-nil means clean headers of messages that are displayed or inserted.
- The variables `mh-visible-headers' and `mh-invisible-headers' control what
- is removed.")
-
- (defvar mh-visible-headers nil
- "*If non-nil, contains a regexp specifying the headers to keep when cleaning.
- Only used if `mh-clean-message-header' is non-nil. Setting this variable
- overrides `mh-invisible-headers'.")
-
- (defvar mh-invisible-headers
- "^Received: \\|^Message-Id: \\|^Remailed-\\|^Via: \\|^Mail-from: \\|^Return-Path: \\|^In-Reply-To: \\|^Resent-"
- "Regexp matching lines in a message header that are not to be shown.
- If `mh-visible-headers' is non-nil, it is used instead to specify what
- to keep.")
-
- (defvar mh-bury-show-buffer t
- "*Non-nil means that the displayed show buffer for a folder is buried.")
-
- (defvar mh-summary-height 4
- "*Number of lines in MH-Folder window (including the mode line).")
-
- (defvar mh-msg-number-regexp "^ *\\([0-9]+\\)"
- "Regexp to find the number of a message in a scan line.
- The message's number must be surrounded with \\( \\)")
-
- (defvar mh-msg-search-regexp "^[^0-9]*%d[^0-9]"
- "Format string containing a regexp matching the scan listing for a message.
- The desired message's number will be an argument to format.")
-
- (defvar mhl-formfile nil
- "*Name of format file to be used by mhl to show and print messages.
- A value of T means use the default format file.
- Nil means don't use mhl to format messages when showing; mhl is still used,
- with the default format file, to format messages when printing them.
- The format used should specify a non-zero value for overflowoffset so
- the message continues to conform to RFC 822 and mh-e can parse the headers.")
-
- (defvar mh-msg-folder-hook nil
- "Select a default folder for refiling or Fcc.
- Called by `\\[mh-refile-msg]' and `\\[mh-to-fcc]' to get a default
- when prompting the user for a folder. Called from within a save-excursion,
- with point at the start of the message. Should return the folder to offer
- as the refile or Fcc folder, as a string with a leading `+' sign.")
-
-
- (defvar mh-cmd-note 4
- "Offset to insert notation.")
-
- (defvar mh-folder-list nil
- "List of folder names for completion.")
-
- (defvar mh-user-path nil
- "User's mail folder directory.")
-
- (defvar mh-draft-folder nil
- "Name of folder containing draft messages.
- NIL means do not use draft folder.")
-
- (defvar mh-previous-window-config nil
- "Window configuration before mh-e command.")
-
- (defvar mh-current-folder nil
- "Name of current folder, a string.")
-
- (defvar mh-folder-filename nil
- "Full path of directory for this folder.")
-
- (defvar mh-show-buffer nil
- "Buffer that displays mesage for this folder.")
-
- (defvar mh-unseen-seq nil
- "Name of the Unseen sequence.")
-
- (defvar mh-previous-seq nil
- "Name of the Previous sequence.")
-
- (defvar mh-seen-list nil
- "List of displayed messages.")
-
- (defvar mh-seq-list nil
- "Alist of (seq . msgs) numbers.")
-
- (defvar mh-showing nil
- "If non-nil, show the message in a separate window.")
-
- (defvar mh-showing-with-headers nil
- "If non-nil, show buffer contains message with all headers.
- If nil, show buffer contains message processed normally.")
-
-
- ;;; mh-e macros
-
- (defmacro with-mh-folder-updating (save-modification-flag-p &rest body)
- ;; Format is (with-mh-folder-updating (SAVE-MODIFICATION-FLAG-P) &body BODY).
- ;; Execute BODY, which can modify the folder buffer without having to
- ;; worry about file locking or the read-only flag, and return its result.
- ;; If SAVE-MODIFICATION-FLAG-P is non-nil, the buffer's modification
- ;; flag is unchanged, otherwise it is cleared.
- (setq save-modification-flag-p (car save-modification-flag-p)) ; CL style
- (` (prog1
- (let ((mh-folder-updating-mod-flag (buffer-modified-p))
- (buffer-read-only nil)
- (buffer-file-name nil)) ;don't let the buffer get locked
- (prog1
- (progn
- (,@ body))
- (mh-set-folder-modified-p mh-folder-updating-mod-flag)))
- (,@ (if (not save-modification-flag-p)
- '((mh-set-folder-modified-p nil)))))))
-
- (put 'with-mh-folder-updating 'lisp-indent-hook 1)
-
- (defmacro mh-in-show-buffer (show-buffer &rest body)
- ;; Format is (mh-in-show-buffer (show-buffer) &body BODY).
- ;; Display buffer SHOW-BUFFER in other window and execute BODY in it.
- ;; Stronger than save-excursion, weaker than save-window-excursion.
- (setq show-buffer (car show-buffer)) ; CL style
- (` (let ((mh-in-show-buffer-saved-window (selected-window)))
- (switch-to-buffer-other-window (, show-buffer))
- (if mh-bury-show-buffer (bury-buffer (current-buffer)))
- (unwind-protect
- (progn
- (,@ body))
- (select-window mh-in-show-buffer-saved-window)))))
-
- (put 'mh-in-show-buffer 'lisp-indent-hook 1)
-
- (defmacro mh-seq-name (pair) (list 'car pair))
-
- (defmacro mh-seq-msgs (pair) (list 'cdr pair))
-
-
- ;;; Ensure new buffers won't get this mode if default-major-mode is nil.
- (put 'mh-show-mode 'mode-class 'special)
-
- (defun mh-show-mode ()
- "Major mode for showing messages in mh-e.
- The value of mh-show-mode-hook is called when a new message is displayed."
- (kill-all-local-variables)
- (setq major-mode 'mh-show-mode)
- (mh-set-mode-name "MH-Show")
- (run-hooks 'mh-show-mode-hook))
-
-
- (defun mh-maybe-show (&optional msg)
- ;; If in showing mode, then display the message pointed to by the cursor.
- (if mh-showing (mh-show msg)))
-
- (defun mh-show (&optional msg)
- "Show MESSAGE (default: message at cursor).
- Force a two-window display with the folder window on top (size
- mh-summary-height) and the show buffer below it.
- If the message is already visible, display the start of the message.
-
- Display of the message is controlled by setting the variables
- `mh-clean-message-header' and `mhl-formfile'. The default behavior is
- to scroll uninteresting headers off the top of the window.
- Type \"\\[mh-header-display]\" to see the message with all its headers."
- (interactive)
- (and mh-showing-with-headers
- (or mhl-formfile mh-clean-message-header)
- (mh-invalidate-show-buffer))
- (mh-show-msg msg))
-
-
- (defun mh-show-msg (msg)
- (if (not msg)
- (setq msg (mh-get-msg-num t)))
- (setq mh-showing t)
- (let ((folder mh-current-folder)
- (clean-message-header mh-clean-message-header)
- (show-window (get-buffer-window mh-show-buffer)))
- (if (not (eql (next-window (minibuffer-window)) (selected-window)))
- (delete-other-windows)) ; force ourself to the top window
- (mh-in-show-buffer (mh-show-buffer)
- (if (and show-window
- (equal (mh-msg-filename msg folder) buffer-file-name))
- (progn ;just back up to start
- (goto-char (point-min))
- (if (not clean-message-header)
- (mh-start-of-uncleaned-message)))
- (mh-display-msg msg folder))))
- (if (not (= (1+ (window-height)) (screen-height))) ;not horizontally split
- (shrink-window (- (window-height) mh-summary-height)))
- (mh-recenter nil)
- (if (not (memq msg mh-seen-list)) (setq mh-seen-list (cons msg mh-seen-list)))
- (run-hooks 'mh-show-hook))
-
-
- (defun mh-display-msg (msg-num folder)
- ;; Display message NUMBER of FOLDER.
- ;; Sets the current buffer to the show buffer.
- (set-buffer folder)
- ;; Bind variables in folder buffer in case they are local
- (let ((formfile mhl-formfile)
- (clean-message-header mh-clean-message-header)
- (invisible-headers mh-invisible-headers)
- (visible-headers mh-visible-headers)
- (msg-filename (mh-msg-filename msg-num))
- (show-buffer mh-show-buffer))
- (if (not (file-exists-p msg-filename))
- (error "Message %d does not exist" msg-num))
- (set-buffer show-buffer)
- (cond ((not (equal msg-filename buffer-file-name))
- ;; Buffer does not yet contain message.
- (clear-visited-file-modtime)
- (unlock-buffer)
- (setq buffer-file-name nil) ; no locking during setup
- (erase-buffer)
- (if formfile
- (mh-exec-lib-cmd-output "mhl" "-nobell" "-noclear"
- (if (stringp formfile)
- (list "-form" formfile))
- msg-filename)
- (insert-file-contents msg-filename))
- (goto-char (point-min))
- (cond (clean-message-header
- (mh-clean-msg-header (point-min)
- invisible-headers
- visible-headers)
- (goto-char (point-min)))
- (t
- (mh-start-of-uncleaned-message)))
- (set-buffer-modified-p nil)
- (or (eq buffer-undo-list t) ;don't save undo info for prev msgs
- (setq buffer-undo-list nil))
- (setq buffer-file-name msg-filename)
- (set-mark nil)
- (mh-show-mode)
- (setq mode-line-buffer-identification
- (list (format mh-show-buffer-mode-line-buffer-id
- folder msg-num)))
- (set-buffer folder)
- (setq mh-showing-with-headers nil)))))
-
- (defun mh-start-of-uncleaned-message ()
- ;; position uninteresting headers off the top of the window
- (let ((case-fold-search t))
- (re-search-forward
- "^To:\\|^From:\\|^Subject:\\|^Date:" nil t)
- (beginning-of-line)
- (mh-recenter 0)))
-
-
- (defun mh-invalidate-show-buffer ()
- ;; Invalidate the show buffer so we must update it to use it.
- (if (get-buffer mh-show-buffer)
- (save-excursion
- (set-buffer mh-show-buffer)
- (setq buffer-file-name nil))))
-
-
- (defun mh-get-msg-num (error-if-no-message)
- ;; Return the message number of the displayed message. If the argument
- ;; ERROR-IF-NO-MESSAGE is non-nil, then complain if the cursor is not
- ;; pointing to a message.
- (save-excursion
- (beginning-of-line)
- (cond ((looking-at mh-msg-number-regexp)
- (string-to-int (buffer-substring (match-beginning 1)
- (match-end 1))))
- (error-if-no-message
- (error "Cursor not pointing to message"))
- (t nil))))
-
-
- (defun mh-msg-filename (msg &optional folder)
- ;; Return the file name of MESSAGE in FOLDER (default current folder).
- (expand-file-name (int-to-string msg)
- (if folder
- (mh-expand-file-name folder)
- mh-folder-filename)))
-
-
- (defun mh-clean-msg-header (start invisible-headers visible-headers)
- ;; Flush extraneous lines in a message header, from the given POINT to the
- ;; end of the message header. If VISIBLE-HEADERS is non-nil, it contains a
- ;; regular expression specifying the lines to display, otherwise
- ;; INVISIBLE-HEADERS contains a regular expression specifying lines to
- ;; delete from the header.
- (let ((case-fold-search t))
- (save-restriction
- (goto-char start)
- (if (search-forward "\n\n" nil 'move)
- (backward-char 1))
- (narrow-to-region start (point))
- (goto-char (point-min))
- (if visible-headers
- (while (< (point) (point-max))
- (cond ((looking-at visible-headers)
- (forward-line 1)
- (while (looking-at "[ \t]") (forward-line 1)))
- (t
- (mh-delete-line 1)
- (while (looking-at "[ \t]")
- (mh-delete-line 1)))))
- (while (re-search-forward invisible-headers nil t)
- (beginning-of-line)
- (mh-delete-line 1)
- (while (looking-at "[ \t]")
- (mh-delete-line 1))))
- (unlock-buffer))))
-
-
- (defun mh-recenter (arg)
- ;; Like recenter but with two improvements: nil arg means recenter,
- ;; and only does anything if the current buffer is in the selected
- ;; window. (Commands like save-some-buffers can make this false.)
- (if (eql (get-buffer-window (current-buffer))
- (selected-window))
- (recenter (if arg arg '(t)))))
-
-
- (defun mh-delete-line (lines)
- ;; Delete version of kill-line.
- (delete-region (point) (save-excursion (forward-line lines) (point))))
-
-
- (defun mh-get-field (field)
- ;; Find and return the value of field FIELD in the current buffer.
- ;; Returns the empty string if the field is not in the message.
- (let ((case-fold-search t))
- (goto-char (point-min))
- (cond ((not (re-search-forward (format "^%s" field) nil t)) "")
- ((looking-at "[\t ]*$") "")
- (t
- (re-search-forward "[\t ]*\\([^\t \n].*\\)$" nil t)
- (let ((start (match-beginning 1)))
- (forward-line 1)
- (while (looking-at "[ \t]")
- (forward-line 1))
- (buffer-substring start (1- (point))))))))
-
-
- (defun mh-notate (msg notation offset)
- ;; Marks MESSAGE with the character NOTATION at position OFFSET.
- ;; Null MESSAGE means the message that the cursor points to.
- (save-excursion
- (if (or (null msg)
- (mh-goto-msg msg t t))
- (with-mh-folder-updating (t)
- (beginning-of-line)
- (forward-char offset)
- (delete-char 1)
- (insert notation)))))
-
-
- (defun mh-goto-msg (number &optional no-error-if-no-message dont-show)
- "Position the cursor at message NUMBER.
- Non-nil second argument means do not signal an error if message does not exist.
- Non-nil third argument means not to show the message.
- Return non-nil if cursor is at message."
- (interactive "NJump to message: ")
- (let ((cur-msg (mh-get-msg-num nil))
- (starting-place (point))
- (msg-pattern (mh-msg-search-pat number)))
- (cond ((cond ((and cur-msg (= cur-msg number)) t)
- ((and cur-msg
- (< cur-msg number)
- (re-search-forward msg-pattern nil t)) t)
- ((and cur-msg
- (> cur-msg number)
- (re-search-backward msg-pattern nil t)) t)
- (t ; Do thorough search of buffer
- (goto-char (point-max))
- (re-search-backward msg-pattern nil t)))
- (beginning-of-line)
- (if (not dont-show) (mh-maybe-show number))
- t)
- (t
- (goto-char starting-place)
- (if (not no-error-if-no-message)
- (error "No message %d" number))
- nil))))
-
- (defun mh-msg-search-pat (n)
- ;; Return a search pattern for message N in the scan listing.
- (format mh-msg-search-regexp n))
-
-
- (defun mh-find-path ()
- ;; Set mh-progs and mh-lib.
- ;; (This step is necessary if MH was installed after this Emacs was dumped.)
- ;; Set mh-user-path, mh-draft-folder,
- ;; mh-unseen-seq, and mh-previous-seq from profile file.
- (mh-find-progs)
- (save-excursion
- ;; Be sure profile is fully expanded before switching buffers
- (let ((profile (expand-file-name (or (getenv "MH") "~/.mh_profile"))))
- (set-buffer (get-buffer-create " *mh-temp*"))
- (setq buffer-offer-save nil) ;for people who set default to t
- (erase-buffer)
- (condition-case err
- (insert-file-contents profile)
- (file-error
- (mh-install profile err)))
- (setq mh-draft-folder (mh-get-field "Draft-Folder:"))
- (cond ((equal mh-draft-folder "")
- (setq mh-draft-folder nil))
- ((not (mh-folder-name-p mh-draft-folder))
- (setq mh-draft-folder (format "+%s" mh-draft-folder))))
- (setq mh-user-path (mh-get-field "Path:"))
- (if (equal mh-user-path "")
- (setq mh-user-path "Mail"))
- (setq mh-user-path
- (file-name-as-directory
- (expand-file-name mh-user-path (expand-file-name "~"))))
- (if (and mh-draft-folder
- (not (file-exists-p (mh-expand-file-name mh-draft-folder))))
- (error "Draft folder \"%s\" not found. Create it and try again."
- (mh-expand-file-name mh-draft-folder)))
- (setq mh-unseen-seq (mh-get-field "Unseen-Sequence:"))
- (if (equal mh-unseen-seq "")
- (setq mh-unseen-seq 'unseen) ;old MH default?
- (setq mh-unseen-seq (intern mh-unseen-seq)))
- (setq mh-previous-seq (mh-get-field "Previous-Sequence:"))
- (if (equal mh-previous-seq "")
- (setq mh-previous-seq nil)
- (setq mh-previous-seq (intern mh-previous-seq))))))
-
- (defun mh-find-progs ()
- (or (file-exists-p (expand-file-name "inc" mh-progs))
- (setq mh-progs
- (or (mh-path-search exec-path "inc")
- (mh-path-search '("/usr/local/bin/mh/"
- "/usr/local/mh/"
- "/usr/bin/mh/" ;Ultrix 4.2
- "/usr/new/mh/" ;Ultrix <4.2
- "/usr/contrib/mh/bin" ;BSDI
- )
- "inc")
- "/usr/local/bin/")))
- (or (file-exists-p (expand-file-name "mhl" mh-lib))
- (setq mh-lib
- (or (mh-path-search '("/usr/local/lib/mh/"
- "/usr/lib/mh/" ;Ultrix 4.2
- "/usr/new/lib/mh/" ;Ultrix <4.2
- "/usr/contrib/mh/lib" ;BSDI
- )
- "mhl")
- (mh-path-search exec-path "mhl") ;unlikely
- "/usr/local/bin/mh/"))))
-
- (defun mh-path-search (path file)
- ;; Search PATH, a list of directory names, for FILE.
- ;; Returns the element of PATH that contains FILE, or nil if not found.
- (while (and path
- (not (file-exists-p (expand-file-name file (car path)))))
- (setq path (cdr path)))
- (car path))
-
- (defun mh-install (profile error-val)
- ;; Called to do error recovery if we fail to read the profile file.
- ;; If possible, initialize the MH environment.
- (if (or (getenv "MH")
- (file-exists-p profile))
- (error "Cannot read MH profile \"%s\": %s"
- profile (car (cdr (cdr error-val)))))
- ;; The "install-mh" command will output a short note which
- ;; mh-exec-cmd will display to the user.
- (mh-exec-cmd (expand-file-name "install-mh" mh-lib) "-auto")
- ;; now try again to read the profile file
- (erase-buffer)
- (condition-case err
- (insert-file-contents profile)
- (file-error
- (error "Cannot read MH profile \"%s\": %s"
- profile (car (cdr (cdr err)))))))
-
-
- (defun mh-set-folder-modified-p (flag)
- "Mark current folder as modified or unmodified according to FLAG."
- (set-buffer-modified-p flag))
-
-
- (defun mh-find-seq (name) (assoc name mh-seq-list))
-
- (defun mh-make-seq (name msgs) (cons name msgs))
-
- (defun mh-seq-to-msgs (seq)
- "Return a list of the messages in SEQUENCE."
- (mh-seq-msgs (mh-find-seq seq)))
-
-
- (defun mh-add-msgs-to-seq (msgs seq &optional internal-flag)
- ;; Add MESSAGE(s) to the SEQUENCE. If optional FLAG is non-nil, do not mark
- ;; the message in the scan listing or inform MH of the addition.
- (let ((entry (mh-find-seq seq)))
- (if (and msgs (atom msgs)) (setq msgs (list msgs)))
- (if (null entry)
- (setq mh-seq-list (cons (mh-make-seq seq msgs) mh-seq-list))
- (if msgs (setcdr entry (append msgs (cdr entry)))))
- (cond ((not internal-flag)
- (mh-add-to-sequence seq msgs)
- (mh-notate-seq seq ?% (1+ mh-cmd-note))))))
-
- (autoload 'mh-add-to-sequence "mh-seq")
- (autoload 'mh-notate-seq "mh-seq")
- (autoload 'mh-read-seq-default "mh-seq")
- (autoload 'mh-map-to-seq-msgs "mh-seq")
-
-
- (defun mh-set-mode-name (mode-name-string)
- ;; Set the mode-name and ensure that the mode line is updated.
- (setq mode-name mode-name-string)
- ;; Force redisplay of all buffers' mode lines to be considered.
- (save-excursion (set-buffer (other-buffer)))
- (set-buffer-modified-p (buffer-modified-p)))
-
-
- (defun mh-prompt-for-folder (prompt default can-create)
- ;; Prompt for a folder name with PROMPT. Returns the folder's name as a
- ;; string. DEFAULT is used if the folder exists and the user types return.
- ;; If the CAN-CREATE flag is t, then a non-existent folder is made.
- (if (null default)
- (setq default ""))
- (let* ((prompt (format "%s folder%s" prompt
- (if (equal "" default)
- "? "
- (format " [%s]? " default))))
- read-name folder-name)
- (if (null mh-folder-list)
- (mh-set-folder-list))
- (while (and (setq read-name (completing-read prompt mh-folder-list
- nil nil "+"))
- (equal read-name "")
- (equal default "")))
- (cond ((or (equal read-name "") (equal read-name "+"))
- (setq read-name default))
- ((not (mh-folder-name-p read-name))
- (setq read-name (format "+%s" read-name))))
- (setq folder-name read-name)
- (cond ((and (> (length folder-name) 0)
- (eql (aref folder-name (1- (length folder-name))) ?/))
- (setq folder-name (substring folder-name 0 -1))))
- (let ((new-file-p (not (file-exists-p (mh-expand-file-name folder-name)))))
- (cond ((and new-file-p
- (y-or-n-p
- (format "Folder %s does not exist. Create it? " folder-name)))
- (message "Creating %s" folder-name)
- (call-process "mkdir" nil nil nil (mh-expand-file-name folder-name))
- (message "Creating %s...done" folder-name)
- (setq mh-folder-list (cons (list read-name) mh-folder-list)))
- (new-file-p
- (error "Folder %s is not created" folder-name))
- ((and (null (assoc read-name mh-folder-list))
- (null (assoc (concat read-name "/") mh-folder-list)))
- (setq mh-folder-list (cons (list read-name) mh-folder-list)))))
- folder-name))
-
-
- (defvar mh-make-folder-list-process nil
- "The background process collecting the folder list.")
-
- (defvar mh-folder-list-temp nil
- "mh-folder-list as it is being built.")
-
- (defvar mh-folder-list-partial-line ""
- "Start of last incomplete line from folder process.")
-
- (defun mh-set-folder-list ()
- "Sets mh-folder-list correctly.
- A useful function for the command line or for when you need to sync by hand.
- Format is in a form suitable for completing read."
- (message "Collecting folder names...")
- (if (not mh-make-folder-list-process)
- (mh-make-folder-list-background))
- (while (eq (process-status mh-make-folder-list-process) 'run)
- (accept-process-output mh-make-folder-list-process))
- (setq mh-folder-list mh-folder-list-temp)
- (setq mh-folder-list-temp nil)
- (delete-process mh-make-folder-list-process)
- (setq mh-make-folder-list-process nil)
- (message "Collecting folder names...done"))
-
- (defun mh-make-folder-list-background ()
- "Start a background process to compute a list of the user's folders.
- Call mh-set-folder-list to wait for the result."
- (cond
- ((not mh-make-folder-list-process)
- (mh-find-progs)
- (let ((process-connection-type nil))
- (setq mh-make-folder-list-process
- (start-process "folders" nil (expand-file-name "folders" mh-progs)
- "-fast"
- (if mh-recursive-folders
- "-recurse"
- "-norecurse")))
- (set-process-filter mh-make-folder-list-process
- 'mh-make-folder-list-filter)
- (process-kill-without-query mh-make-folder-list-process)))))
-
- (defun mh-make-folder-list-filter (process output)
- ;; parse output from "folders -fast"
- (let ((position 0)
- (line-end t)
- new-folder)
- (while line-end
- (setq line-end (string-match "\n" output position))
- (cond
- (line-end ;make sure got complete line
- (setq new-folder (format "+%s%s"
- mh-folder-list-partial-line
- (substring output position line-end)))
- (setq mh-folder-list-partial-line "")
- ;; is new folder a subfolder of previous?
- (if (and mh-folder-list-temp
- (string-match (regexp-quote
- (concat (car (car mh-folder-list-temp)) "/"))
- new-folder))
- ;; append slash to parent folder for better completion
- ;; (undone by mh-prompt-for-folder)
- (setq mh-folder-list-temp
- (cons (list new-folder)
- (cons
- (list (concat (car (car mh-folder-list-temp)) "/"))
- (cdr mh-folder-list-temp))))
- (setq mh-folder-list-temp
- (cons (list new-folder)
- mh-folder-list-temp)))
- (setq position (1+ line-end)))))
- (setq mh-folder-list-partial-line (substring output position))))
-
-
- (defun mh-folder-name-p (name)
- ;; Return non-NIL if NAME is possibly the name of a folder.
- ;; A name (a string or symbol) can be a folder name if it begins with "+".
- (if (symbolp name)
- (eql (aref (symbol-name name) 0) ?+)
- (and (> (length name) 0)
- (eql (aref name 0) ?+))))
-
-
- ;;; Issue commands to MH.
-
-
- (defun mh-exec-cmd (command &rest args)
- ;; Execute mh-command COMMAND with ARGS.
- ;; Any output is assumed to be an error and is shown to the user.
- (save-excursion
- (set-buffer (get-buffer-create " *mh-temp*"))
- (erase-buffer)
- (apply 'call-process
- (expand-file-name command mh-progs) nil t nil
- (mh-list-to-string args))
- (if (> (buffer-size) 0)
- (save-window-excursion
- (switch-to-buffer-other-window " *mh-temp*")
- (sit-for 5)))))
-
-
- (defun mh-exec-cmd-error (env command &rest args)
- ;; In environment ENV, execute mh-command COMMAND with args ARGS.
- ;; ENV is nil or a string of space-separated "var=value" elements.
- ;; Signals an error if process does not complete successfully.
- (save-excursion
- (set-buffer (get-buffer-create " *mh-temp*"))
- (erase-buffer)
- (let ((status
- (if env
- ;; the shell hacks necessary here shows just how broken Unix is
- (apply 'call-process "/bin/sh" nil t nil "-c"
- (format "%s %s ${1+\"$@\"}"
- env
- (expand-file-name command mh-progs))
- command
- (mh-list-to-string args))
- (apply 'call-process
- (expand-file-name command mh-progs) nil t nil
- (mh-list-to-string args)))))
- (mh-handle-process-error command status))))
-
-
- (defun mh-exec-cmd-daemon (command &rest args)
- ;; Execute MH command COMMAND with ARGS. Any output from command is
- ;; displayed in an asynchronous pop-up window.
- (save-excursion
- (set-buffer (get-buffer-create " *mh-temp*"))
- (erase-buffer))
- (let* ((process-connection-type nil)
- (process (apply 'start-process
- command nil
- (expand-file-name command mh-progs)
- (mh-list-to-string args))))
- (set-process-filter process 'mh-process-daemon)))
-
- (defun mh-process-daemon (process output)
- ;; Process daemon that puts output into a temporary buffer.
- (set-buffer (get-buffer-create " *mh-temp*"))
- (insert-before-markers output)
- (display-buffer " *mh-temp*"))
-
-
- (defun mh-exec-cmd-quiet (raise-error command &rest args)
- ;; Args are RAISE-ERROR, COMMANDS, ARGS....
- ;; Execute MH command COMMAND with ARGS. ARGS is a list of strings.
- ;; Return at start of mh-temp buffer, where output can be parsed and used.
- ;; Returns value of call-process, which is 0 for success,
- ;; unless RAISE-ERROR is non-nil, in which case an error is signaled
- ;; if call-process returns non-0.
- (set-buffer (get-buffer-create " *mh-temp*"))
- (erase-buffer)
- (let ((value
- (apply 'call-process
- (expand-file-name command mh-progs) nil t nil
- args)))
- (goto-char (point-min))
- (if raise-error
- (mh-handle-process-error command value)
- value)))
-
-
- (defun mh-exec-cmd-output (command display &rest args)
- ;; Execute MH command COMMAND with DISPLAY flag and ARGS.
- ;; Put the output into buffer after point. Set mark after inserted text.
- (push-mark (point) t)
- (apply 'call-process
- (expand-file-name command mh-progs) nil t display
- (mh-list-to-string args))
- (exchange-point-and-mark))
-
-
- (defun mh-exec-lib-cmd-output (command &rest args)
- ;; Execute MH library command COMMAND with ARGS.
- ;; Put the output into buffer after point. Set mark after inserted text.
- (apply 'mh-exec-cmd-output (expand-file-name command mh-lib) nil args))
-
-
- (defun mh-handle-process-error (command status)
- ;; Raise error if COMMAND returned non-0 STATUS, otherwise return STATUS.
- ;; STATUS is return value from call-process.
- ;; Program output is in current buffer.
- ;; If output is too long ot include in error message, display the bufffer.
- (cond ((eql status 0) ;success
- status)
- ((stringp status) ;kill string
- (error (format "%s: %s" command status)))
- (t ;exit code
- (cond
- ((= (buffer-size) 0) ;program produced no error message
- (error (format "%s: exit code %d" command status)))
- (t
- ;; will error message fit on one line?
- (goto-line 2)
- (if (and (< (buffer-size) (screen-width))
- (eobp))
- (error (buffer-substring 1 (progn (goto-char 1)
- (end-of-line)
- (point))))
- (display-buffer (current-buffer))
- (error (format
- "%s failed with status %d. See error message in other window."
- command status))))))))
-
-
- (defun mh-expand-file-name (filename &optional default)
- "Just like `expand-file-name', but also handles MH folder names.
- Assumes that any filename that starts with '+' is a folder name."
- (if (mh-folder-name-p filename)
- (expand-file-name (substring filename 1) mh-user-path)
- (expand-file-name filename default)))
-
-
- (defun mh-list-to-string (l)
- ;; Flattens the list L and makes every element of the new list into a string.
- (nreverse (mh-list-to-string-1 l)))
-
- (defun mh-list-to-string-1 (l)
- (let ((new-list nil))
- (while l
- (cond ((null (car l)))
- ((symbolp (car l))
- (setq new-list (cons (symbol-name (car l)) new-list)))
- ((numberp (car l))
- (setq new-list (cons (int-to-string (car l)) new-list)))
- ((equal (car l) ""))
- ((stringp (car l)) (setq new-list (cons (car l) new-list)))
- ((listp (car l))
- (setq new-list (nconc (mh-list-to-string-1 (car l))
- new-list)))
- (t (error "Bad element in mh-list-to-string: %s" (car l))))
- (setq l (cdr l)))
- new-list))
-
- (provide 'mh-utils)
-
- (and (not noninteractive)
- mh-auto-folder-collect
- (mh-make-folder-list-background))
-
- ;;; mh-utils.el ends here
-