Fix and docfix for the minibuffer-eldef-shorten-default feature.

* lisp/minibuf-eldef.el (minibuffer-eldef-shorten-default): Convert to
a defcustom with an appropriate :set function.
(minibuffer-default--in-prompt-regexps): New function.

* doc/emacs/mini.texi (Basic Minibuffer): New node.  Document
minibuffer-electric-default-mode.

* doc/emacs/display.texi (Visual Line Mode): Fix index entry.

4 files changed, 44 insertions, 17 deletions

diff --git a/doc/emacs/ChangeLog b/doc/emacs/ChangeLog
index 489da459838..5804af2733a 100644
--- a/doc/emacs/ChangeLog
+++ b/doc/emacs/ChangeLog
@@ -1,5 +1,10 @@
 2012-11-07  Chong Yidong  <cyd@gnu.org>
 
+        * mini.texi (Basic Minibuffer): New node.  Document
+        minibuffer-electric-default-mode.
+
+        * display.texi (Visual Line Mode): Fix index entry.
+
         * buffers.texi (Several Buffers): List Buffer Menu command anmes,
         and index the keybindings.  Document tabulated-list-sort.
         (Kill Buffer): Capitalize Buffer Menu.
diff --git a/doc/emacs/display.texi b/doc/emacs/display.texi
index c40c545ec53..b6ab4913f9c 100644
--- a/doc/emacs/display.texi
+++ b/doc/emacs/display.texi
@@ -1500,6 +1500,7 @@ attempts to wrap the line at word boundaries near the right window
 edge.  This makes the text easier to read, as wrapping does not occur
 in the middle of words.
 
+@cindex mode, Visual Line
 @cindex Visual Line mode
 @findex visual-line-mode
 @findex global-visual-line-mode
diff --git a/doc/emacs/emacs.texi b/doc/emacs/emacs.texi
index e7e0feb9e88..74da3d9587b 100644
--- a/doc/emacs/emacs.texi
+++ b/doc/emacs/emacs.texi
@@ -261,6 +261,7 @@ Basic Editing Commands
 
 The Minibuffer
 
+* Basic Minibuffer::      Basic usage of the minibuffer.
 * Minibuffer File::     Entering file names with the minibuffer.
 * Minibuffer Edit::     How to edit in the minibuffer.
 * Completion::          An abbreviation facility for minibuffer input.
diff --git a/doc/emacs/mini.texi b/doc/emacs/mini.texi
index e5a84bda56d..ebccedacc05 100644
--- a/doc/emacs/mini.texi
+++ b/doc/emacs/mini.texi
@@ -13,24 +13,54 @@ special-purpose buffer with a small amount of screen space.  You can
 use the usual Emacs editing commands in the minibuffer to edit the
 argument text.
 
+@menu
+* Basic Minibuffer::      Basic usage of the minibuffer.
+* Minibuffer File::       Entering file names with the minibuffer.
+* Minibuffer Edit::       How to edit in the minibuffer.
+* Completion::            An abbreviation facility for minibuffer input.
+* Minibuffer History::    Reusing recent minibuffer arguments.
+* Repetition::            Re-executing commands that used the minibuffer.
+* Passwords::             Entering passwords in the echo area.
+* Yes or No Prompts::     Replying yes or no in the echo area.
+@end menu
+
+@node Basic Minibuffer
+@section Using the Minibuffer
+
 @cindex prompt
   When the minibuffer is in use, it appears in the echo area, with a
-cursor.  The minibuffer starts with a @dfn{prompt} in a distinct
-color, usually ending with a colon.  The prompt states what kind of
-input is expected, and how it will be used.
+cursor.  The minibuffer starts with a @dfn{prompt}, usually ending
+with a colon.  The prompt states what kind of input is expected, and
+how it will be used.  The prompt is highlighted using the
+@code{minibuffer-prompt} face (@pxref{Faces}).
 
   The simplest way to enter a minibuffer argument is to type the text,
-then @key{RET} to submit the argument and exit the minibuffer.  You
-can cancel the minibuffer, and the command that wants the argument, by
-typing @kbd{C-g}.
+then @key{RET} to submit the argument and exit the minibuffer.
+Alternatively, you can type @kbd{C-g} to exit the minibuffer by
+cancelling the command asking for the argument (@pxref{Quitting}).
 
 @cindex default argument
-  Sometimes, a @dfn{default argument} appears in the prompt, inside
+  Sometimes, the prompt shows a @dfn{default argument}, inside
 parentheses before the colon.  This default will be used as the
 argument if you just type @key{RET}.  For example, commands that read
 buffer names usually show a buffer name as the default; you can type
 @key{RET} to operate on that default buffer.
 
+@cindex Minibuffer Electric Default mode
+@cindex mode, Minibuffer Electric Default
+@findex minibuffer-electric-default-mode
+@vindex minibuffer-eldef-shorten-default
+  If you enable Minibuffer Electric Default mode, a global minor mode,
+Emacs hides the default argument as soon as you modify the contents of
+the minibuffer (since typing @key{RET} would no longer submit that
+default).  If you ever bring back the original minibuffer text, the
+prompt again shows the default.  Furthermore, if you change the
+variable @code{minibuffer-eldef-shorten-default} to a non-@code{nil}
+value, the default argument is displayed as @samp{[@var{default}]}
+instead of @samp{(default @var{default})}, saving some screen space.
+To enable this minor mode, type @kbd{M-x
+minibuffer-electric-default-mode}.
+
   Since the minibuffer appears in the echo area, it can conflict with
 other uses of the echo area.  If an error message or an informative
 message is emitted while the minibuffer is active, the message hides
@@ -38,16 +68,6 @@ the minibuffer for a few seconds, or until you type something; then
 the minibuffer comes back.  While the minibuffer is in use, keystrokes
 do not echo.
 
-@menu
-* Minibuffer File::       Entering file names with the minibuffer.
-* Minibuffer Edit::       How to edit in the minibuffer.
-* Completion::            An abbreviation facility for minibuffer input.
-* Minibuffer History::    Reusing recent minibuffer arguments.
-* Repetition::            Re-executing commands that used the minibuffer.
-* Passwords::             Entering passwords in the echo area.
-* Yes or No Prompts::     Replying yes or no in the echo area.
-@end menu
-
 @node Minibuffer File
 @section Minibuffers for File Names