Commit e5780ae1 authored by Lars Hansen's avatar Lars Hansen

(desktop-buffer-mode-handlers): New variabel. Alist

of major mode specific functions to restore a desktop buffer.
(desktop-buffer-handlers): Make variabel obsolete.
(desktop-create-buffer): Use desktop-buffer-mode-handlers. Catch
errors signaled in handlers. Update buffer count. Evaluate
(desktop-buffer-dired): Rename to dired-restore-desktop-buffer and
move to dired.el.
(desktop-buffer-info): Rename to Info-restore-desktop-buffer and
move to info.el.
(desktop-buffer-rmail): Rename to rmail-restore-desktop-buffer and
move to mail/rmail.el.
(desktop-buffer-mh): Rename to mh-restore-desktop-buffer and move
to mh-e/mh-e.el.
(desktop-buffer-file): Rename to desktop-restore-file-buffer. An
fail, print message (to message buffer) even if
desktop-missing-file-warning is nil.
(desktop-buffer-misc-data-function): New buffer local
variable. Function returning major mode specific data.
(desktop-buffer-misc-functions): Make variable obsolete.
(desktop-save): Use desktop-buffer-misc-data-function.
(desktop-buffer-dired-misc-data): Rename to
dired-desktop-buffer-misc-data and move to dired.el.
(desktop-buffer-info-misc-data): Rename to
Info-desktop-buffer-misc-data and move to info.el.
(desktop-read): Add message about number of buffers
parent 31b4c848
......@@ -83,12 +83,6 @@
;;; Code:
;; Make the compilation more silent
;; We use functions from these modules
;; We can't (require 'mh-e) since that wants to load something.
(mapcar 'require '(info dired reporter)))
(defvar desktop-file-version "206"
"Version number of desktop file format.
Written into the desktop file and used at desktop read to provide
......@@ -253,8 +247,9 @@ The variables are saved only when they really are local."
(defcustom desktop-buffer-modes-to-save
'(Info-mode rmail-mode)
"If a buffer is of one of these major modes, save the buffer state.
It is up to the functions in `desktop-buffer-handlers' to decide
whether the buffer should be recreated or not, and how."
This applies to buffers not visiting a file and not beeing a dired buffer.
Modes specified here must have a handler in `desktop-buffer-mode-handlers'
to be restored."
:type '(repeat symbol)
:group 'desktop)
......@@ -272,53 +267,59 @@ Possible values are:
:type '(choice (const absolute) (const tilde) (const local))
:group 'desktop)
(defcustom desktop-buffer-misc-functions
"*Functions used to determine auxiliary information for a buffer.
These functions are called by `desktop-save' in order, with no
arguments. If a function returns non-nil, its value is saved along
with the state of the buffer for which it was called; no further
functions will be called.
(defvar desktop-buffer-misc-data-function nil
"Function returning major mode specific data for desktop file.
This variable becomes buffer local when set.
The function specified is called by `desktop-save', with argument
DESKTOP-DIRNAME. If it returns non-nil, its value is saved along
with the state of the buffer for which it was called.
When file names are returned, they should be formatted using the call
\"(desktop-file-name FILE-NAME dirname)\".
\"(desktop-file-name FILE-NAME DESKTOP-DIRNAME)\".
Later, when `desktop-read' restores buffers, each of the functions in
`desktop-buffer-handlers' will have access to a buffer local variable,
named `desktop-buffer-misc', whose value is what the function in
`desktop-buffer-misc-functions' returned."
:type '(repeat function)
:group 'desktop)
Later, when `desktop-read' calls a function in `desktop-buffer-mode-handlers'
to restore the buffer, the auxiliary information is passed as argument.")
(make-variable-buffer-local 'desktop-buffer-misc-data-function)
(make-obsolete-variable 'desktop-buffer-misc-functions
(defcustom desktop-buffer-handlers
"*Functions called by `desktop-read' in order to create a buffer.
The functions are called without explicit parameters but can use the
following variables:
(defcustom desktop-buffer-mode-handlers '(
(dired-mode . dired-restore-desktop-buffer)
(rmail-mode . rmail-restore-desktop-buffer)
(mh-folder-mode . mh-restore-desktop-buffer)
(Info-mode . Info-restore-desktop-buffer))
"Alist of major mode specific functions to restore a desktop buffer.
Functions are called by `desktop-read'. List elements must have the form
Buffers with a major mode not specified here, are restored by the default
handler `desktop-restore-file-buffer'.
Handlers are called with parameters
Furthermore, they may use the following variables:
If one function returns non-nil, no further functions are called.
If the function returns a buffer, then the saved mode settings
If a handler returns a buffer, then the saved mode settings
and variable values for that buffer are copied into it."
:type '(repeat function)
:type 'alist
:group 'desktop)
(put 'desktop-buffer-handlers 'risky-local-variable t)
(put 'desktop-buffer-mode-handlers 'risky-local-variable t)
(make-obsolete-variable 'desktop-buffer-handlers
(defcustom desktop-minor-mode-table
'((auto-fill-function auto-fill-mode)
......@@ -608,7 +609,9 @@ See also `desktop-base-file-name'."
(list (mark t) mark-active)
(run-hook-with-args-until-success 'desktop-buffer-misc-functions)
;; Auxiliary information
(when desktop-buffer-misc-data-function
(funcall desktop-buffer-misc-data-function dirname))
(let ((locals desktop-locals-to-save)
(loclist (buffer-local-variables))
......@@ -703,7 +706,9 @@ It returns t if a desktop file was loaded, nil otherwise."
(if (file-exists-p (expand-file-name desktop-base-file-name desktop-dirname))
;; Desktop file found, process it.
(let ((desktop-first-buffer nil))
(let ((desktop-first-buffer nil)
(desktop-buffer-ok-count 0)
(desktop-buffer-fail-count 0))
;; Evaluate desktop buffer.
(load (expand-file-name desktop-base-file-name desktop-dirname) t t t)
;; `desktop-create-buffer' puts buffers at end of the buffer list.
......@@ -715,7 +720,12 @@ It returns t if a desktop file was loaded, nil otherwise."
(run-hooks 'desktop-delay-hook)
(setq desktop-delay-hook nil)
(run-hooks 'desktop-after-read-hook)
(message "Desktop loaded.")
(message "Desktop: %d buffer%s restored%s."
(if (= 1 desktop-buffer-ok-count) "" "s")
(if (< 0 desktop-buffer-fail-count)
(format ", %d failed to restore" desktop-buffer-fail-count)
;; No desktop file found.
......@@ -772,106 +782,21 @@ directory DIRNAME."
(desktop-read desktop-dirname))
;; ----------------------------------------------------------------------------
;; Note: the following functions use the dynamic variable binding in Lisp.
(eval-when-compile ; Just to silence the byte compiler
(defvar desktop-file-version)
(defvar desktop-buffer-file-name)
(defvar desktop-buffer-name)
(defvar desktop-buffer-major-mode)
(defvar desktop-buffer-minor-modes)
(defvar desktop-buffer-point)
(defvar desktop-buffer-mark)
(defvar desktop-buffer-read-only)
(defvar desktop-buffer-misc)
(defvar desktop-buffer-locals)
(defun desktop-buffer-info-misc-data ()
(if (eq major-mode 'Info-mode)
(list Info-current-file
;; ----------------------------------------------------------------------------
(defun desktop-buffer-dired-misc-data ()
(when (eq major-mode 'dired-mode)
(eval-when-compile (defvar dirname))
;; Value of `dired-directory'.
(if (consp dired-directory)
;; Directory name followed by list of files.
(cons (desktop-file-name (car dired-directory) dirname) (cdr dired-directory))
;; Directory name, optionally with with shell wildcard.
(desktop-file-name dired-directory dirname))
;; Subdirectories in `dired-subdir-alist'.
(function (lambda (f) (desktop-file-name (car f) dirname)))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-info () "Load an info file."
(if (eq 'Info-mode desktop-buffer-major-mode)
(let ((first (nth 0 desktop-buffer-misc))
(second (nth 1 desktop-buffer-misc)))
(when (and first second)
(require 'info)
(Info-find-node first second))
;; ----------------------------------------------------------------------------
(eval-when-compile (defvar rmail-buffer)) ; Just to silence the byte compiler.
(defun desktop-buffer-rmail () "Load an RMAIL file."
(if (eq 'rmail-mode desktop-buffer-major-mode)
(condition-case error
(progn (rmail-input desktop-buffer-file-name)
(if (eq major-mode 'rmail-mode)
(kill-buffer (current-buffer))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-mh () "Load a folder in the mh system."
(if (eq 'mh-folder-mode desktop-buffer-major-mode)
(mh-visit-folder desktop-buffer-name)
;; ----------------------------------------------------------------------------
(defun desktop-buffer-dired () "Load a directory using dired."
(if (eq 'dired-mode desktop-buffer-major-mode)
;; First element of `desktop-buffer-misc' is the value of `dired-directory'.
;; This value is a directory name, optionally with with shell wildcard or
;; a directory name followed by list of files.
(let* ((dired-dir (car desktop-buffer-misc))
(dir (if (consp dired-dir) (car dired-dir) dired-dir)))
(if (file-directory-p (file-name-directory dir))
(dired dired-dir)
;; The following elements of `desktop-buffer-misc' are the keys
;; from `dired-subdir-alist'.
(mapcar 'dired-maybe-insert-subdir (cdr desktop-buffer-misc))
(message "Directory %s no longer exists." dir)
(sit-for 1)
;; ----------------------------------------------------------------------------
(defun desktop-buffer-file ()
"Load a file."
(defun desktop-restore-file-buffer (desktop-buffer-file-name
"Restore a file buffer."
(eval-when-compile ; Just to silence the byte compiler
(defvar desktop-buffer-major-mode)
(defvar desktop-buffer-locals))
(if desktop-buffer-file-name
(if (or (file-exists-p desktop-buffer-file-name)
(and desktop-missing-file-warning
(y-or-n-p (format
"File \"%s\" no longer exists. Re-create? "
(let ((msg (format "Desktop: File \"%s\" no longer exists."
(if desktop-missing-file-warning
(y-or-n-p (concat msg " Re-create? "))
(message msg)
(let* ((auto-insert nil) ; Disable auto insertion
(or coding-system-for-read
......@@ -885,7 +810,7 @@ directory DIRNAME."
(functionp desktop-buffer-major-mode)
(funcall desktop-buffer-major-mode))
;; ----------------------------------------------------------------------------
;; Create a buffer, load its file, set is mode, ...; called from Desktop file
......@@ -907,20 +832,32 @@ directory DIRNAME."
;; Just to silence the byte compiler. Bound locally in `desktop-read'.
(defvar desktop-buffer-ok-count)
(defvar desktop-buffer-fail-count))
;; To make desktop files with relative file names possible, we cannot
;; allow `default-directory' to change. Therefore we save current buffer.
(let (
(buffer-list (buffer-list))
(hlist desktop-buffer-handlers)
(condition-case err
(funcall (or (cdr (assq desktop-buffer-major-mode desktop-buffer-mode-handlers))
(message "Desktop: Can't load buffer %s: %s"
desktop-buffer-name (error-message-string err))
(when desktop-missing-file-warning (sit-for 1))
;; Call desktop-buffer-handlers to create buffer.
(while (and (not result) hlist)
(setq handler (car hlist))
(setq result (funcall handler))
(setq hlist (cdr hlist)))
(if (bufferp result)
(setq desktop-buffer-ok-count (1+ desktop-buffer-ok-count))
(setq desktop-buffer-fail-count (1+ desktop-buffer-fail-count))
(setq result nil))
(unless (bufferp result) (setq result nil))
;; Restore buffer list order with new buffer at end. Don't change
;; the order for old desktop files (old desktop module behaviour).
......@@ -947,7 +884,12 @@ directory DIRNAME."
;; Even though point and mark are non-nil when written by `desktop-save'
;; they may be modified by handlers wanting to set point or mark themselves.
(when desktop-buffer-point (goto-char desktop-buffer-point))
(when desktop-buffer-point
(condition-case err
;; Evaluate point. Thus point can be something like '(search-forward ...
(eval desktop-buffer-point)
(error (message "%s" (error-message-string err)) 1))))
(when desktop-buffer-mark
(if (consp desktop-buffer-mark)
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