As a result, certain macros, functions, and predicates no longer handle
specifications for floating point numbers.
+@itemize @bullet
+@item
The function @code{string-to-number}, the predicate @code{floatp}, and
the variable @code{float-output-format} have all been eliminated.
+@item
The functions @code{float}, @code{truncate}, @code{floor}, @code{ceil},
@code{round}, and @code{logb} do not exist; neither do the functions
@code{abs}, @code{cos}, @code{sin}, @code{tan}, @code{acos},
@code{asin}, @code{atan}, @code{exp}, @code{expt}, @code{log10},
@code{log}, or @code{sqrt}.
+@item
The @code{format} function no longer handles the specifications
@samp{%e}, @samp{%f} and @samp{%g} for printing floating point numbers;
likewise for @code{message}.
+@end itemize
@section Changes in Basic Editing Functions
Many file-related functions have been eliminated or simplified. Here is
a basic listing of these functions.
+@itemize @bullet
+@item
The functions @code{file-accessible-directory-p}, @code{file-truename},
@code{make-directory}, @code{delete-directory},
@code{set-visited-file-modtime}, @code{directory-abbrev-alist},
@code{set-default-file-modes}, @code{default-file-modes}, and
@code{unix-sync} have been eliminated.
+@item
We got rid of the ``initial file name'' argument to
@code{read-file-name}.
+@item
Additionally, we removed the 12th element from the list returned by
@code{file-attributes}.
+@item
@code{directory-files} always sorts the list of files. It's not user
friendly to process the files in any haphazard order.
+@item
We eliminated the variables @code{write-contents-hooks} and
@code{local-write-file-hooks}.
+@end itemize
@section Making Certain File Names ``Magic''
@itemize @bullet
@item
The functions @code{mouse-position} and @code{set-mouse-position}, and
-the special form @code{track-mouse} have been eliminated.
+the special form @code{track-mouse}, have been eliminated.
@item
Likewise, the functions @code{x-set-selection}, @code{x-set-cut-buffer},
@code{x-display-visual-class}, @code{x-display-color-p}, and
@code{x-display-color-cells}.
+@item
Additionally, we removed the variable @code{x-no-window-manager} and the
functions @code{x-synchronize} and @code{x-get-resource}.
+@item
We didn't abolish @code{x-display-color-p}, but we renamed it to
@code{x-color-display-p}. We did abolish @code{x-color-defined-p}.
We removed the @code{read-event}, @code{event-start},
@code{posn-window}, @code{posn-point}, @code{posn-col-row},
@code{posn-timestamp}, @code{scroll-bar-scale}, and @code{event-end}
-functions, since they were only useful for non-character events.
+functions, since they were useful only for non-character events.
@item
We removed the @code{unread-command-events} and @code{last-event-frame}
@section Menus
+@itemize @bullet
+@item
You can no longer define menus as keymaps; good system design requires
crafting a special-purpose interface for each facility, so it can
precisely fit the requirements of that facility. We decided that
unifying keymaps and menus was simply too much of a strain.
-In Emacs 18, you can only activate menus with the mouse. Using them
+@item
+In Emacs 18, you can activate menus only with the mouse. Using them
with a keyboard was too confusing for too many users.
+@item
Emacs 18 has no menu bars. All functions and variables related to the
menu bar have been eliminated.
+@end itemize
@section Changes in Minibuffer Features
+@itemize @bullet
+@item
The minibuffer history feature has been eliminated. Thus, we removed
the optional argument @var{hist} from the minibuffer input functions
@code{read-from-minibuffer} and @code{completing-read}.
+@item
The @var{initial} argument to @code{read-from-minibuffer} and other
minibuffer input functions can no longer be a cons cell
@code{(@var{string} . @var{position})}.
+@item
In the function @code{read-no-blanks-input}, the @var{initial} argument
is no longer optional.
+@end itemize
@section New Features for Defining Commands
@section Removed Features for Reading Input
+@itemize @bullet
+@item
We removed the third argument (@var{meta}) from the function
@code{set-input-mode}. Consequently, we added the variable
@code{meta-flag}; set it to @code{t} to enable use of a Meta key, and
to @code{nil} to disable it. (Those are the only two alternatives.)
+@item
We also removed the variable @code{extra-keyboard-modifiers}.
+@item
We removed the function @code{keyboard-translate} and the variables
@code{num-input-keys} and @code{function-key-map}.
+@end itemize
@section Removed Syntax Table Features
@section The Case Table
+@itemize @bullet
+@item
Case tables do not exist in Emacs 18. Due to this change, we have
removed the associated functions @code{set-standard-case-table},
@code{standard-case-table}, @code{current-case-table},
@code{set-case-table}, and @code{set-case-syntax-pair}.
+@end itemize
@section Features for Dealing with Buffers
@section Features for Subprocesses
+@itemize @bullet
+@item
@code{call-process} and @code{call-process-region} no longer indicate
the termination status of the subprocess. We call on users to have faith
that the subprocess executed properly.
-@itemize
@item
The standard asynchronous subprocess features do not work on VMS;
instead, special VMS asynchronous subprocess functions have been added.
@section Memory Allocation Changes
+@itemize @bullet
+@item
We removed the function @code{memory-limit}.
+@item
The list returned by @code{garbage-collect} no longer contains an
element to describe floating point numbers, since there aren't any
floating point numbers in Emacs 18.
+@end itemize
@section Hook Changes