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;;; startup.el --- process Emacs shell arguments

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;; Copyright (C) 1985, 1986, 1992 Free Software Foundation, Inc.

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;; Maintainer: FSF
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;; Keywords: internal
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;; 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
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;; the Free Software Foundation; either version 2, or (at your option)
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;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.

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;;; Commentary:
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; These are processed only at the beginning of the argument list.
; -batch		execute noninteractively (messages go to stdout,
;			 variable noninteractive set to t)
;			 This option must be the first in the arglist.
;			 Processed by `main' in emacs.c -- never seen by lisp
; -t file		Specify to use file rather than stdin/stdout
;			 as the terminal.
;			 This option must be the first in the arglist.
;			 Processed by `main' in emacs.c -- never seen by lisp
; -nw			Inhibit the use of any window-system-specific display
;			 code; use the current virtual terminal.
;			 This option must be the first in the arglist.
;			 Processed by `main' in emacs.c -- never seen by lisp
; -q			load no init file
; -no-init-file		same
; -u user		load user's init file
; -user user		same
; -debug-init		Don't catch errors in init file; let debugger run.

; These are processed in the order encountered.
; -f function		execute function
; -funcall function	same
; -l file		load file
; -load file		same
; -i file		insert file into buffer
; -insert file		same
; file			visit file
; -kill			kill (exit) emacs

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;;; Code:

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(setq top-level '(normal-top-level))

(defvar command-line-processed nil "t once command line has been processed")

(defconst inhibit-startup-message nil
  "*Non-nil inhibits the initial startup messages.
This is for use in your personal init file, once you are familiar
with the contents of the startup message.")

(defconst inhibit-default-init nil
  "*Non-nil inhibits loading the `default' library.")

(defconst command-switch-alist nil
  "Alist of command-line switches.
Elements look like (SWITCH-STRING . HANDLER-FUNCTION).
HANDLER-FUNCTION receives switch name as sole arg;
remaining command-line args are in the variable `command-line-args-left'.")

(defvar command-line-functions nil    ;; lrs 7/31/89
  "List of functions to process unrecognized command-line arguments.
Each function should access the dynamically bound variables
argi (the current argument) and command-line-args-left (the remaining
arguments).  The function should return non-nil only if it recognizes and
processes argi.  If it does so, it may consume successive arguments by
altering command-line-args-left to remove them.")

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(defvar before-init-hook nil
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  "Functions to call after handling urgent options but before loading init file.
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The frame system uses this to open frames to display messages while
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Emacs loads the user's initialization file.")

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(defvar after-init-hook nil
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  "Functions to call after loading the init file (`~/.emacs').
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The call is not protected by a condition-case, so you can set `debug-on-error'
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in `.emacs', and put all the actual code on `after-init-hook'.")
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(defvar term-setup-hook nil
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  "Functions to be called after loading terminal-specific lisp code.
See `run-hooks'.  This variable exists for users to set,
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so as to override the definitions made by the terminal-specific file.
Emacs never sets this variable itself.")

(defvar keyboard-type nil
  "The brand of keyboard you are using.  This variable is used to define
the proper function and keypad keys for use under X.  It is used in a
fashion analogous to the environment value TERM.")

(defvar window-setup-hook nil
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  "Function called to initialize window system display.
Emacs calls this after processing the command line arguments and loading
the user's init file.

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Users should not set this variable; use term-setup-hook instead.")

(defconst initial-major-mode 'lisp-interaction-mode
  "Major mode command symbol to use for the initial *scratch* buffer.")

(defvar init-file-user nil
  "Identity of user whose `.emacs' file is or was read.
The value may be the null string or a string containing a user's name.
If the value is a null string, it means that the init file was taken from
the user that originally logged in.

In all cases, `(concat \"~\" init-file-user \"/\")' evaluates to the
directory name of the directory where the `.emacs' file was looked for.")

(defvar init-file-debug nil)

(defun normal-top-level ()
  (if command-line-processed
      (message "Back to top level.")
    (setq command-line-processed t)
    ;; In presence of symlinks, switch to cleaner form of default directory.
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    (if (not (eq system-type 'vax-vms))
	(mapcar (function
		 (lambda (var)
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		   (let ((value (getenv var)))
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		     (if (and value
			      (< (length value) (length default-directory))
			      (equal (file-attributes default-directory)
				     (file-attributes value)))
			 (setq default-directory
			       (file-name-as-directory value))))))
		'("PWD" "HOME")))
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    (setq default-directory (abbreviate-file-name default-directory))
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    (unwind-protect
	(command-line)
      (run-hooks 'emacs-startup-hook)
      (and term-setup-hook
	   (run-hooks 'term-setup-hook))
      (and window-setup-hook
	   (run-hooks 'window-setup-hook)))))

(defun command-line ()
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  ;; See if we should import version-control from the environment variable.
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  (let ((vc (getenv "VERSION_CONTROL")))
    (cond ((eq vc nil))			;don't do anything if not set
	  ((or (string= vc "t")
	       (string= vc "numbered"))
	   (setq version-control t))
	  ((or (string= vc "nil")
	       (string= vc "existing"))
	   (setq version-control nil))
	  ((or (string= vc "never")
	       (string= vc "simple"))
	   (setq version-control 'never))))

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  ;;! This has been commented out; I currently find the behavior when
  ;;! split-window-keep-point is nil disturbing, but if I can get used
  ;;! to it, then it would be better to eliminate the option.
  ;;! ;; Choose a good default value for split-window-keep-point.
  ;;! (setq split-window-keep-point (> baud-rate 2400))
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  ;; Read window system's init file if using a window system.
  (if (and window-system (not noninteractive))
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      (load (concat term-file-prefix
		    (symbol-name window-system)
		    "-win")
	    ;; Every window system should have a startup file;
	    ;; barf if we can't find it.
	    nil t))
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  (let ((done nil)
	(args (cdr command-line-args)))

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    ;; Figure out which user's init file to load,
    ;; either from the environment or from the options.
    (setq init-file-user (if noninteractive nil (user-login-name)))
    ;; If user has not done su, use current $HOME to find .emacs.
    (and init-file-user (string= init-file-user (user-real-login-name))
	 (setq init-file-user ""))
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    ;; Process the command-line args, and delete the arguments
    ;; processed.  This is consistent with the way main in emacs.c
    ;; does things.
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    (while (and (not done) args)
      (let ((argi (car args)))
	(cond
	 ((or (string-equal argi "-q")
	      (string-equal argi "-no-init-file"))
	  (setq init-file-user nil
		args (cdr args)))
	 ((or (string-equal argi "-u")
	      (string-equal argi "-user"))
	  (setq args (cdr args)
		init-file-user (car args)
		args (cdr args)))
	 ((string-equal argi "-debug-init")
	  (setq init-file-debug t
		args (cdr args)))
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	 (t (setq done t)))))
    
    ;; Re-attach the program name to the front of the arg list.
    (setcdr command-line-args args))
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  (run-hooks 'before-init-hook)
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  ;; Run the site-start library if it exists.  The point of this file is
  ;; that it is run before .emacs.  There is no point in doing this after
  ;; .emacs; that is useless.
  (load "site-start" t t)

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  ;; Load that user's init file, or the default one, or none.
  (let ((debug-on-error init-file-debug)
	;; This function actually reads the init files.
	(inner
	 (function
	  (lambda ()
	    (if init-file-user
		(progn (load (if (eq system-type 'vax-vms)
				 "sys$login:.emacs"
			       (concat "~" init-file-user "/.emacs"))
			     t t t)
		       (or inhibit-default-init
			   (let ((inhibit-startup-message nil))
			     ;; Users are supposed to be told their rights.
			     ;; (Plus how to get help and how to undo.)
			     ;; Don't you dare turn this off for anyone
			     ;; except yourself.
			     (load "default" t t)))))))))
    (if init-file-debug
	;; Do this without a condition-case if the user wants to debug.
	(funcall inner)
      (condition-case error
	  (funcall inner)
	(error (message "Error in init file: %s%s%s"
			(get (car error) 'error-message)
			(if (cdr error) ": ")
			(mapconcat 'prin1-to-string (cdr error) ", "))))))
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  (run-hooks 'after-init-hook)

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  ;; If *scratch* exists and init file didn't change its mode, initialize it.
  (if (get-buffer "*scratch*")
      (save-excursion
	(set-buffer "*scratch*")
	(if (eq major-mode 'fundamental-mode)
	    (funcall initial-major-mode))))
  ;; Load library for our terminal type.
  ;; User init file can set term-file-prefix to nil to prevent this.
  (and term-file-prefix (not noninteractive) (not window-system)
       (let ((term (getenv "TERM"))
	     hyphend)
	 (while (and term
		     (not (load (concat term-file-prefix term) t t)))
	   ;; Strip off last hyphen and what follows, then try again
	   (if (setq hyphend (string-match "[-_][^-_]+$" term))
	       (setq term (substring term 0 hyphend))
	     (setq term nil)))))

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  ;; Process the remaining args.
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  (command-line-1 (cdr command-line-args))

  ;; If -batch, terminate after processing the command options.
  (if noninteractive (kill-emacs t)))

(defun command-line-1 (command-line-args-left)
  (if (null command-line-args-left)
      (cond ((and (not inhibit-startup-message) (not noninteractive)
		  ;; Don't clobber a non-scratch buffer if init file
		  ;; has selected it.
		  (string= (buffer-name) "*scratch*")
		  (not (input-pending-p)))
	     ;; If there are no switches to process, we might as well
	     ;; run this hook now, and there may be some need to do it
	     ;; before doing any output.
	     (and term-setup-hook
		  (run-hooks 'term-setup-hook))
	     ;; Don't let the hook be run twice.
	     (setq term-setup-hook nil)
	     (and window-setup-hook
		  (run-hooks 'window-setup-hook))
	     (setq window-setup-hook nil)
	     (unwind-protect
		 (progn
		   (insert (emacs-version)
			   "
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Copyright (C) 1991 Free Software Foundation, Inc.\n\n")
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		   ;; If keys have their default meanings,
		   ;; use precomputed string to save lots of time.
		   (if (and (eq (key-binding "\C-h") 'help-command)
			    (eq (key-binding "\C-xu") 'advertised-undo)
			    (eq (key-binding "\C-x\C-c") 'save-buffers-kill-emacs)
			    (eq (key-binding "\C-h\C-c") 'describe-copying)
			    (eq (key-binding "\C-h\C-d") 'describe-distribution)
			    (eq (key-binding "\C-h\C-w") 'describe-no-warranty)
			    (eq (key-binding "\C-ht") 'help-with-tutorial))
		       (insert 
       "Type C-h for help; C-x u to undo changes.  (`C-' means use CTRL key.)
To kill the Emacs job, type C-x C-c.
Type C-h t for a tutorial on using Emacs.
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Type C-h i to enter Info, which you can use to read GNU documentation.
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GNU Emacs comes with ABSOLUTELY NO WARRANTY; type C-h C-w for full details.
You may give out copies of Emacs; type C-h C-c to see the conditions.
Type C-h C-d for information on getting the latest version.")
		     (insert (substitute-command-keys
       "Type \\[help-command] for help; \\[advertised-undo] to undo changes.  (`C-' means use CTRL key.)
To kill the Emacs job, type \\[save-buffers-kill-emacs].
Type \\[help-with-tutorial] for a tutorial on using Emacs.
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Type \\[info] to enter Info, which you can use to read GNU documentation.
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GNU Emacs comes with ABSOLUTELY NO WARRANTY; type \\[describe-no-warranty] for full details.
You may give out copies of Emacs; type \\[describe-copying] to see the conditions.
Type \\[describe-distribution] for information on getting the latest version.")))
		   (set-buffer-modified-p nil)
		   (sit-for 120))
	       (save-excursion
		 ;; In case the Emacs server has already selected
		 ;; another buffer, erase the one our message is in.
		 (set-buffer (get-buffer "*scratch*"))
		 (erase-buffer)
		 (set-buffer-modified-p nil)))))
    (let ((dir default-directory)
	  (file-count 0)
	  first-file-buffer
	  (line 0))
      (while command-line-args-left
	(let ((argi (car command-line-args-left))
	      tem)
	  (setq command-line-args-left (cdr command-line-args-left))
	  (cond ((setq tem (assoc argi command-switch-alist))
		 (funcall (cdr tem) argi))
		((or (string-equal argi "-f")  ;what the manual claims
		     (string-equal argi "-funcall")
		     (string-equal argi "-e")) ; what the source used to say
		 (setq tem (intern (car command-line-args-left)))
		 (setq command-line-args-left (cdr command-line-args-left))
		 (funcall tem))
		((or (string-equal argi "-l")
		     (string-equal argi "-load"))
		 (let ((file (car command-line-args-left)))
		   ;; Take file from default dir if it exists there;
		   ;; otherwise let `load' search for it.
		   (if (file-exists-p (expand-file-name file))
		       (setq file (expand-file-name file)))
		   (load file nil t))
		 (setq command-line-args-left (cdr command-line-args-left)))
		((or (string-equal argi "-i")
		     (string-equal argi "-insert"))
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		 (or (stringp (car command-line-args-left))
		     (error "filename omitted from `-i' option"))
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		 (insert-file-contents (car command-line-args-left))
		 (setq command-line-args-left (cdr command-line-args-left)))
		((string-equal argi "-kill")
		 (kill-emacs t))
		((string-match "^\\+[0-9]+\\'" argi)
		 (setq line (string-to-int argi)))
		(t
		 ;; We have almost exhausted our options. See if the
		 ;; user has made any other command-line options available
		 (let ((hooks command-line-functions);; lrs 7/31/89
		       (did-hook nil))
		   (while (and hooks
			       (not (setq did-hook (funcall (car hooks)))))
		     (setq hooks (cdr hooks)))
		   (if (not did-hook)
		       ;; Ok, presume that the argument is a file name
		       (progn
			 (setq file-count (1+ file-count))
			 (cond ((= file-count 1)
				(setq first-file-buffer
				      (find-file (expand-file-name argi dir))))
			       (t
				(find-file-other-window (expand-file-name argi dir))))
			 (or (zerop line)
			     (goto-line line))
			 (setq line 0))))))))
      ;; If 3 or more files visited, and not all visible,
      ;; show user what they all are.
      (if (> file-count 2)
	  (or (get-buffer-window first-file-buffer)
	      (progn (other-window)
		     (buffer-menu)))))))
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;;; startup.el ends here