[Emacs-diffs] Changes to emacs/lisp/term/pc-win.el,v

[Eli Zaretskii]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Eli Zaretskii <eliz>    08/08/23 17:01:46

Index: pc-win.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/term/pc-win.el,v
retrieving revision 1.47
retrieving revision 1.48
diff -u -b -r1.47 -r1.48
--- pc-win.el   6 May 2008 04:34:21 -0000       1.47
+++ pc-win.el   23 Aug 2008 17:01:46 -0000      1.48
@@ -23,15 +23,30 @@
 
 ;;; Commentary:
 
+;; This file is preloaded into Emacs by loadup.el.  The functions in
+;; this file are then called during startup from startup.el.  This
+;; means that just loading this file should not have any side effects
+;; besides defining functions and variables, and in particular should
+;; NOT initialize any window systems.
+
+;; The main entry points to this file's features are msdos-handle-args,
+;; msdos-create-frame-with-faces, msdos-initialize-window-system,
+;; terminal-init-internal.  The last one is not supposed to be called,
+;; so it just errors out.
+
 ;;; Code:
 
+(if (not (fboundp 'msdos-remember-default-colors))
+    (error "%s: Loading pc-win.el but not compiled for MS-DOS"
+          (invocation-name)))
+
 (load "term/internal" nil t)
 
 (declare-function msdos-remember-default-colors "msdos.c")
 (declare-function w16-set-clipboard-data "w16select.c")
 (declare-function w16-get-clipboard-data "w16select.c")
 
-;;; This is copied from etc/rgb.txt, except that some values were changed
+;;; This was copied from etc/rgb.txt, except that some values were changed
 ;;; a bit to make them consistent with DOS console colors, and the RGB
 ;;; values were scaled up to 16 bits, as `tty-define-color' requires.
 ;;;
@@ -67,10 +82,10 @@
 ;; ---------------------------------------------------------------------------
 ;; We want to delay setting frame parameters until the faces are setup
 (defvar default-frame-alist nil)
-(modify-frame-parameters terminal-frame default-frame-alist)
-(tty-color-clear)
+;(modify-frame-parameters terminal-frame default-frame-alist)
 
 (defun msdos-face-setup ()
+  "Set up initial faces for the MS-DOS display."
   (set-face-foreground 'bold "yellow" terminal-frame)
   (set-face-foreground 'italic "red" terminal-frame)
   (set-face-foreground 'bold-italic "lightred" terminal-frame)
@@ -85,8 +100,6 @@
   (set-face-background 'msdos-menu-passive-face "blue" terminal-frame)
   (set-face-background 'msdos-menu-select-face "red" terminal-frame))
 
-(add-hook 'before-init-hook 'msdos-face-setup)
-
 (defun msdos-handle-reverse-video (frame parameters)
   "Handle the reverse-video frame parameter on MS-DOS frames."
   (when (cdr (or (assq 'reverse parameters)
@@ -103,8 +116,7 @@
 
 ;; This must run after all the default colors are inserted into
 ;; tty-color-alist, since msdos-handle-reverse-video needs to know the
-;; actual frame colors.  tty-color-alist is set up by startup.el, but
-;; only after it runs before-init-hook and after-init-hook.
+;; actual frame colors.
 (defun msdos-setup-initial-frame ()
   (modify-frame-parameters terminal-frame default-frame-alist)
   ;; This remembers the screen colors after applying default-frame-alist,
@@ -117,23 +129,29 @@
   (frame-set-background-mode terminal-frame)
   (face-set-after-frame-default terminal-frame))
 
-(add-hook 'term-setup-hook 'msdos-setup-initial-frame)
-
-;; We create frames as if we were a terminal, but with a twist.
-(defun make-msdos-frame (&optional parameters)
+;; We create frames as if we were a terminal, but without invoking the
+;; terminal-initialization function.  Also, our handling of reverse
+;; video is slightly different.
+(defun msdos-create-frame-with-faces (&optional parameters)
+  "Create an frame on MS-DOS display.
+Optional frame parameters PARAMETERS specify the frame parameters.
+Parameters not specified by PARAMETERS are taken from
+`default-frame-alist'.  If either PARAMETERS or `default-frame-alist'
+contains a `reverse' parameter, handle that.  Value is the new frame
+created."
   (let ((frame (make-terminal-frame parameters))
        success)
     (unwind-protect
-       (progn
+       (with-selected-frame frame
          (msdos-handle-reverse-video frame (frame-parameters frame))
+          (unless (terminal-parameter frame 'terminal-initted)
+            (set-terminal-parameter frame 'terminal-initted t))
          (frame-set-background-mode frame)
          (face-set-after-frame-default frame)
          (setq success t))
       (unless success (delete-frame frame)))
     frame))
 
-(add-to-list 'frame-creation-function-alist '(pc . make-msdos-frame))
-
 ;; ---------------------------------------------------------------------------
 ;; More or less useful imitations of certain X-functions.  A lot of the
 ;; values returned are questionable, but usually only the form of the
@@ -163,7 +181,6 @@
 ;; From lisp/term/x-win.el
 (defvar x-display-name "pc"
   "The display name specifying the MS-DOS display and frame type.")
-(setq split-window-keep-point t)
 (defvar x-colors (mapcar 'car msdos-color-values)
   "The list of colors available on a PC display under MS-DOS.")
 
@@ -209,10 +226,6 @@
         (t
          (setq x-last-selected-text text))))))
 
-;;; Arrange for the kill and yank functions to set and check the clipboard.
-(setq interprogram-cut-function 'x-select-text)
-(setq interprogram-paste-function 'x-get-selection-value)
-
 ;; From lisp/faces.el: we only have one font, so always return
 ;; it, no matter which variety they've asked for.
 (defun x-frob-font-slant (font which)
@@ -241,7 +254,81 @@
 (fset 'set-cursor-color 'ignore)       ; Hardware determined by char under.
 (fset 'set-border-color 'ignore)       ; Not useful.
 
+;; Initialization.
+;; ---------------------------------------------------------------------------
+;; This function is run, by faces.el:tty-create-frame-with-faces, only
+;; for the initial frame (on each terminal, but we have only one).
+;; This works by setting the `terminal-initted' terminal parameter to
+;; this function, the first time `tty-create-frame-with-faces' is
+;; called on that terminal.  `tty-create-frame-with-faces' is called
+;; directly from startup.el and also by `make-frame' through
+;; `frame-creation-function-alist'.  `make-frame' will call this
+;; function if `msdos-create-frame-with-faces' (see below) is not
+;; found in `frame-creation-function-alist', which means something is
+;; _very_ wrong, because "internal" terminal emulator should not be
+;; turned on if our window-system is not `pc'.  Therefore, the only
+;; Right Thing for us to do here is scream bloody murder.
+(defun terminal-init-internal ()
+  "Terminal initialization function for the MS-DOS \"internal\" terminal.
+Errors out because it is not supposed to be called, ever."
+  (error "terminal-init-internal called for window-system `%s'"
+        (window-system)))
+
+(defun msdos-initialize-window-system ()
+  "Initialization function for the `pc' \"window system\"."
+  (or (eq (window-system) 'pc)
+      (error
+       "`msdos-initialize-window-system' called, but window-system is `%s'"
+       (window-system)))
+  ;; First, the keyboard.
+  (msdos-setup-keyboard terminal-frame)        ; see internal.el
+  ;; Next, register the default colors.
+  (let* ((colors msdos-color-values)
+        (color (car colors)))
+    (tty-color-clear)
+    (while colors
+      (tty-color-define (car color) (cadr color) (cddr color))
+      (setq colors (cdr colors) color (car colors))))
+  ;; Modifying color mappings means realized faces don't
+  ;; use the right colors, so clear them.
+  (clear-face-cache)
+  ;; Now set up some additional faces.
+  (msdos-face-setup)
+  ;; Set up the initial frame.
+  (msdos-setup-initial-frame)
+  ;; We want to delay the codepage-related setup until after user's
+  ;; .emacs is processed, because people might define their
+  ;; `dos-codepage-setup-hook' there.
+  (add-hook 'after-init-hook 'dos-codepage-setup)
+  ;; In multibyte mode, we want unibyte buffers to be displayed
+  ;; using the terminal coding system, so that they display
+  ;; correctly on the DOS terminal; in unibyte mode we want to see
+  ;; all 8-bit characters verbatim.  In both cases, we want the
+  ;; entire range of 8-bit characters to arrive at our display code
+  ;; verbatim.
+  (standard-display-8bit 127 255)
+  ;; We are fast enough to make this optimization unnecessary.
+  (setq split-window-keep-point t)
+  ;; Arrange for the kill and yank functions to set and check the
+  ;; clipboard.
+  (setq interprogram-cut-function 'x-select-text)
+  (setq interprogram-paste-function 'x-get-selection-value)
+  (menu-bar-enable-clipboard)
+  (run-hooks 'terminal-init-msdos-hook))
+
+;; frame-creation-function-alist is examined by frame.el:make-frame.
+(add-to-list 'frame-creation-function-alist
+            '(pc . msdos-create-frame-with-faces))
+;; window-system-initialization-alist is examined by startup.el:command-line.
+(add-to-list 'window-system-initialization-alist
+            '(pc . msdos-initialize-window-system))
+;; We don't need anything beyond tty-handle-args for handling
+;; command-line argument; see startup.el.
+(add-to-list 'handle-args-function-alist '(pc . tty-handle-args))
+
 ;; ---------------------------------------------------------------------------
 
+(provide 'pc-win)
+
 ;; arch-tag: 5cbdb455-b495-427b-95d0-e417d77d00b4
 ;;; pc-win.el ends here