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早期freebsd实现

* Rectangle operations are now implemented.
 C-x r stores the rectangle described by dot and mark
 into a register; it reads the register name from the keyboard.
 C-x g, the command to insert the contents of a register,
 can be used to reinsert the rectangle elsewhere.

 Other rectangle commands include
  open-rectangle:
    insert a blank rectangle in the position and size
    described by dot and mark, at its corners;
    the existing text is pushed to the right.
  clear-rectangle:
    replace the rectangle described by dot ane mark
    with blanks.  The previous text is deleted.
  delete-rectangle:
    delete the text of the specified rectangle,
    moving the text beyond it on each line leftward.

* Side-by-side windows are allowed.  Use C-x 5 to split the
 current window into two windows side by side.
 C-x } makes the selected window ARG columns wider at the
 expense of the windows at its sides.  C-x { makes the selected
 window ARG columns narrower.  An argument to C-x 5 specifies
 how many columns to give to the leftmost of the two windows made.

 C-x 2 now accepts a numeric argument to specify the number of
 lines to give to the uppermost of the two windows it makes.

* Horizontal scrolling of the lines in a window is now implemented.
 C-x < (scroll-left) scrolls all displayed lines left,
 with the numeric argument (default 1) saying how far to scroll.
 When the window is scrolled left, some amount of the beginning
 of each nonempty line is replaced by an "$".
 C-x > scrolls right.  If a window has no text hidden at the left
 margin, it cannot be scrolled any farther right than that.
 When nonzero leftwards scrolling is in effect in a window.
 lines are automatically truncated at the window's right margin
 regardless of the value of the variable truncate-lines in the
 buffer being displayed.

* C-x C-d now uses the default output format of `ls',
 which gives just file names in multiple columns.
 C-u C-x C-d passes the -l switch to `ls'.

* C-t at the end of a line now exchanges the two preceding characters.

 All the transpose commands now interpret zero as an argument
 to mean to transpose the textual unit after or around dot
 with the one after or around the mark.

* M-! executes a shell command in an inferior shell
 and displays the output from it.  With a prefix argument,
 it inserts the output in the current buffer after dot
 and sets the mark after the output.  The shell command
 gets /dev/null as its standard input.

 M-| is like M-! but passes the contents of the region
 as input to the shell command.  A prefix argument makes
 the output from the command replace the contents of the region.

* The mode line will now say "Def" after the major mode
 while a keyboard macro is being defined.

* The variable fill-prefix is now used by Meta-q.
 Meta-q removes the fill prefix from lines that start with it
 before filling, and inserts the fill prefix on each line
 after filling.

 The command C-x . sets the fill prefix equal to the text
 on the current line before dot.

* The new command Meta-j (indent-new-comment-line),
 is like Linefeed (indent-new-line) except when dot is inside a comment;
 in that case, Meta-j inserts a comment starter on the new line,
 indented under the comment starter above.  It also inserts
 a comment terminator at the end of the line above,
 if the language being edited calls for one.

* Rmail should work correctly now, and has some C-h m documentation.

Changes in Emacs 1.6

* save-buffers-kill-emacs is now on C-x C-c
 while C-x C-z does suspend-emacs.  This is to make
 C-x C-c like the normal Unix meaning of C-c
 and C-x C-z linke the normal Unix meaning of C-z.

* M-ESC (eval-expression) is now a disabled command by default.
 This prevents users who type ESC ESC accidentally from
 getting confusing results.  Put
    (put 'eval-expression 'disabled nil)
 in your ~/.emacs file to enable the command.

* Self-inserting text is grouped into bunches for undoing.
 Each C-x u command undoes up to 20 consecutive self-inserting
 characters.

* Help f now uses as a default the function being called
 in the innermost Lisp expression that dot is in.
 This makes it more convenient to use while writing
 Lisp code to run in Emacs.
 (If the text around dot does not appear to be a call
 to a Lisp function, there is no default.)

 Likewise, Help v uses the symbol around or before dot
 as a default, if that is a variable name.

* Commands that read filenames now insert the default
 directory in the minibuffer, to become part of your input.
 This allows you to see what the default is.
 You may type a filename which goes at the end of the
 default directory, or you may edit the default directory
 as you like to create the input you want to give.
 You may also type an absolute pathname (starting with /)
 or refer to a home directory (input starting with ~)
 after the default; the presence of // or /~ causes
 everything up through the slash that precedes your
 type-in to be ignored.

 Returning the default directory without change,
 including the terminating slash, requests the use
 of the default file name (usually the visited file's name).

 Set the variable insert-default-directory to nil
 to turn off this feature.

* M-x shell now uses the environment variable ESHELL,
 if it exists, as the file name of the shell to run.
 If there is no ESHELL variable, the SHELL variable is used.
 This is because some shells do not work properly as inferiors
 of Emacs (or anything like Emacs).

* A new variable minor-modes now exists, with a separate value
 in each buffer.  Its value should be an alist of elements
 (MODE-FUNCTION-SYMBOL . PRETTY-NAME-STRING), one for each
 minor mode that is turned on in the buffer.  The pretty
 name strings are displayed in the mode line after the name of the
 major mode (with spaces between them).  The mode function
 symbols should be symbols whose function definitions will
 turn on the minor mode if given 1 as an argument; they are present
 so that Help m can find their documentation strings.

* The format of tag table files has been changed.
 The new format enables Emacs to find tags much faster.

 A new program, etags, exists to make the kind of
 tag table that Emacs wants.  etags is invoked just
 like ctags; in fact, if you give it any switches,
 it does exactly what ctags would do.  Give it the
 empty switch ("-") to make it act like ctags with no switches.

 etags names the tag table file "TAGS" rather than "tags",
 so that these tag tables and the standard Unix ones
 can coexist.

 The tags library can no longer use standard ctags-style
 tag tables files.

* The file of Lisp code Emacs reads on startup is now
 called ~/.emacs rather than ~/.emacs_pro.

* copy-file now gives the copied file the same mode bits
 as the original file.

* Output from a process inserted into the process's buffer
 no longer sets the buffer's mark.  Instead it sets a
 marker associated with the process to point to the end
 of the inserted text.  You can access this marker with
    (process-mark PROCESS)
 and then either examine its position with marker-position
 or set its position with set-marker.

* completing-read takes a new optional fifth argument which,
 if non-nil, should be a string of text to insert into
 the minibuffer before reading user commands.

* The Lisp function elt now exists:
 (elt ARRAY N) is like (aref ARRAY N),
 (elt LIST N) is like (nth N LIST).

* rplaca is now a synonym for setcar, and rplacd for setcdr.
 eql is now a synonym for eq; it turns out that the Common Lisp
 distinction between eq and eql is insignificant in Emacs.
 numberp is a new synonym for integerp.

* auto-save has been renamed to auto-save-mode.

* Auto save file names for buffers are now created by the
 function make-auto-save-file-name.  This is so you can
 redefine that function to change the way auto save file names
 are chosen.

* expand-file-name no longer discards a final slash.
    (expand-file-name "foo" "/lose") => "/lose/foo"
    (expand-file-name "foo/" "/lose") => "/lose/foo/"

 Also, expand-file-name no longer substitutes $ constructs.
 A new function substitute-in-file-name does this.  Reading
 a file name with read-file-name or the `f' or`F' option
 of interactive calling uses substitute-in-file-name
 on the file name that was read and returns the result.

 All I/O primitives including insert-file-contents and
 delete-file call expand-file-name on the file name supplied.
 This change makes them considerably faster in the usual case.

* Interactive calling spec strings allow the new code letter 'D'
 which means to read a directory name.  It is like 'f' except
 that the default if the user makes no change in the minibuffer
 is to return the current default directory rather than the
 current visited file name.

Changes in Emacs 1.5

* suspend-emacs now accepts an optional argument
 which is a string to be stuffed as terminal input
 to be read by Emacs's superior shell after Emacs exits.

 A library called ledit exists which uses this feature
 to transmit text to a Lisp job running as a sibling of
 Emacs.

* If find-file is given the name of a directory,
 it automatically invokes dired on that directory
 rather than reading in the binary data that make up
 the actual contents of the directory according to Unix.

* Saving an Emacs buffer now preserves the file modes
 of any previously existing file with the same name.
 This works using new Lisp functions file-modes and
 set-file-modes, which can be used to read or set the mode
 bits of any file.

* The Lisp function  cond  now exists, with its traditional meaning.

* defvar and defconst now permit the documentation string
 to be omitted.  defvar also permits the initial value
 to be omitted; then it acts only as a comment.

Changes in Emacs 1.4

* Auto-filling now normally indents the new line it creates
 by calling indent-according-to-mode.  This function, meanwhile,
 has in Fundamental and Text modes the effect of making the line
 have an indentation of the value of left-margin, a per-buffer variable.

 Tab no longer precisely does indent-according-to-mode;
 it does that in all modes that supply their own indentation routine,
 but in Fundamental, Text and allied modes it inserts a tab character.

* The command M-x grep now invokes grep (on arguments
 supplied by the user) and reads the output from grep
 asynchronously into a buffer.  The command C-x ` can
 be used to move to the lines that grep has found.
 This is an adaptation of the mechanism used for
 running compilations and finding the loci of error messages.

 You can now use C-x ` even while grep or compilation
 is proceeding; as more matches or error messages arrive,
 C-x ` will parse them and be able to find them.

* M-x mail now provides a command to send the message
 and "exit"--that is, return to the previously selected
 buffer.  It is C-z C-z.

* Tab in C mode now tries harder to adapt to all indentation styles.
 If the line being indented is a statement that is not the first
 one in the containing compound-statement, it is aligned under
 the beginning of the first statement.

* The functions screen-width and screen-height return the
 total width and height of the screen as it is now being used.
 set-screen-width and set-screen-height tell Emacs how big
 to assume the screen is; they each take one argument,
 an integer.

* The Lisp function 'function' now exists.  function is the
 same as quote, except that it serves as a signal to the
 Lisp compiler that the argument should be compiled as
 a function.  Example:
   (mapcar (function (lambda (x) (+ x 5))) list)

* The function set-key has been renamed to global-set-key.
 undefine-key and local-undefine-key has been renamed to
 global-unset-key and local-unset-key.

* Emacs now collects input from asynchronous subprocesses
 while waiting in the functions sleep-for and sit-for.

* Shell mode's Newline command attempts to distinguish subshell
 prompts from user input when issued in the middle of the buffer.
 It no longer reexecutes from dot to the end of the line;