[Emacs-diffs] Changes to ediff.texi

[Glenn Morris]

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Glenn Morris <gm>       07/09/06 04:59:27

Index: ediff.texi
===================================================================
RCS file: ediff.texi
diff -N ediff.texi
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ ediff.texi  6 Sep 2007 04:59:27 -0000       1.1
@@ -0,0 +1,2546 @@
+\input texinfo                  @c -*-texinfo-*-
address@hidden documentation for Ediff
address@hidden Written by Michael Kifer
+
address@hidden %**start of header (This is for running Texinfo on a region.)
+
address@hidden Using ediff.info instead of ediff in setfilename breaks DOS.
address@hidden @setfilename ediff
address@hidden @setfilename ediff.info
address@hidden ../info/ediff
+
address@hidden Ediff User's Manual
address@hidden vr cp
address@hidden fn cp
address@hidden pg cp
address@hidden ky cp
+
address@hidden
address@hidden
address@hidden iftex
address@hidden      @smallbook
address@hidden %**end of header (This is for running Texinfo on a region.)
+
address@hidden
+This file documents Ediff, a comprehensive visual interface to Unix diff
+and patch utilities.
+
+Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+
address@hidden
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with the Front-Cover texts being ``A GNU
+Manual'', and with the Back-Cover Texts as in (a) below.  A copy of the
+license is included in the section entitled ``GNU Free Documentation
+License'' in the Emacs manual.
+
+(a) The FSF's Back-Cover Text is: ``You have freedom to copy and modify
+this GNU Manual, like GNU software.  Copies published by the Free
+Software Foundation raise funds for GNU development.''
+
+This document is part of a collection distributed under the GNU Free
+Documentation License.  If you want to distribute this document
+separately from the collection, you can do so by adding a copy of the
+license to the document, as described in section 6 of the license.
address@hidden quotation
address@hidden copying
+
address@hidden Emacs
address@hidden
+* Ediff: (ediff).       A visual interface for comparing and merging programs.
address@hidden direntry
+
address@hidden
address@hidden Ediff User's Manual
address@hidden 4
address@hidden Ediff version 2.81.1
address@hidden 1
address@hidden April 2007
address@hidden 5
address@hidden Michael Kifer
address@hidden
+
address@hidden 0pt plus 1filll
address@hidden
address@hidden titlepage
+
+
address@hidden Top, Introduction, (dir), (dir)
+
+
address@hidden
+* Introduction::                About Ediff.
+* Major Entry Points::          How to use Ediff.
+* Session Commands::            Ediff commands used within a session.
+* Registry of Ediff Sessions::  Keeping track of multiple Ediff sessions.
+* Session Groups::              Comparing and merging directories.
+* Remote and Compressed Files::  You may want to know about this.
+* Customization::               How to make Ediff work the way YOU want.
+* Credits::                     Thanks to those who helped.
+* GNU Free Documentation License:: The license for this documentation.
+* Index::
address@hidden menu
+
address@hidden Introduction, Major Entry Points, Top, Top
address@hidden Introduction
+
address@hidden Comparing files and buffers
address@hidden Merging files and buffers
address@hidden Patching files and buffers
address@hidden Finding differences
+
+Ediff provides a convenient way for simultaneous browsing through
+the differences between a pair (or a triple) of files or buffers
+(which are called @samp{variants} for our purposes).  The
+files being compared, file-A, file-B, and file-C (if applicable) are
+shown in separate windows (side by side, one above the another, or in
+separate frames), and the differences are highlighted as you step
+through them.  You can also copy difference regions from one buffer to
+another (and recover old differences if you change your mind).
+
+Another powerful feature is the ability to merge a pair of files into a
+third buffer.  Merging with an ancestor file is also supported.
+Furthermore, Ediff is equipped with directory-level capabilities that
+allow the user to conveniently launch browsing or merging sessions on
+groups of files in two (or three) different directories.
+
+In addition, Ediff can apply a patch to a file and then let you step through
+both files, the patched and the original one, simultaneously,
+difference-by-difference.  You can even apply a patch right out of a mail
+buffer, i.e., patches received by mail don't even have to be saved.  Since
+Ediff lets you copy differences between variants, you can, in effect, apply
+patches selectively (i.e., you can copy a difference region from
address@hidden to @file{file}, thereby undoing any particular patch that
+you don't like).
+
+Ediff even understands multi-file patches and can apply them interactively!
+(Ediff can recognize multi-file patches only if they are in the context
+format or GNU unified format.  All other patches are treated as 1-file
+patches.  Ediff is [hopefully] using the same algorithm as @code{patch} to
+determine which files need to be patched.)
+
+Ediff is aware of version control, which lets you compare
+files with their older versions.  Ediff also works with remote and
+compressed files, automatically ftp'ing them over and uncompressing them.
address@hidden and Compressed Files}, for details.
+
+This package builds upon ideas borrowed from Emerge, and several of Ediff's
+functions are adaptations from Emerge.  Although Ediff subsumes and greatly
+extends Emerge, much of the functionality in Ediff is influenced by Emerge.
+The architecture and the interface are, of course, drastically different.
+
address@hidden Major Entry Points, Session Commands, Introduction, Top
address@hidden Major Entry Points
+
+When Ediff starts up, it displays a small control window, which accepts the
+Ediff commands, and two or three windows displaying the files to be compared
+or merged. The control window can be in its own small frame or it can be
+part of a bigger frame that displays other buffers. In any case, it is
+important that the control window be active (i.e., be the one receiving the
+keystrokes) when you use Ediff. You can switch to other Emacs buffers at
+will and even edit the files currently being compared with Ediff and then
+switch back to Ediff at any time by activating the appropriate Emacs windows.
+
+Ediff can be invoked interactively using the following functions, which can
+be run either from the minibuffer or from the menu bar.  In the menu bar,
+all Ediff's entry points belong to three submenus of the Tools menu:
+Compare, Merge, and Apply Patch.
+
address@hidden @code
address@hidden ediff-files
address@hidden ediff
address@hidden ediff-files
address@hidden ediff
+Compare two files.
+
address@hidden ediff-backup
address@hidden ediff-backup
+Compare a file with its backup. If there are several numerical backups, use
+the latest. If the file is itself a backup, then compare it with its
+original.
+
address@hidden ediff-buffers
address@hidden ediff-buffers
+Compare two buffers.
+
address@hidden ediff-files3
address@hidden ediff3
address@hidden ediff-files3
address@hidden ediff3
+Compare three files.
+
address@hidden ediff-buffers3
address@hidden ediff-buffers3
+Compare three buffers.
+
address@hidden edirs
address@hidden ediff-directories
address@hidden edirs
address@hidden ediff-directories
+ Compare files common to two directories.
address@hidden edirs3
address@hidden ediff-directories3
address@hidden edirs3
address@hidden ediff-directories3
+ Compare files common to three directories.
address@hidden edir-revisions
address@hidden ediff-directory-revisions
address@hidden ediff-directory-revisions
address@hidden edir-revisions
+ Compare versions of files in a given directory.  Ediff selects only the
+files that are under version control.
address@hidden edir-merge-revisions
address@hidden ediff-merge-directory-revisions
address@hidden edir-merge-revisions
address@hidden ediff-merge-directory-revisions
+ Merge versions of files in a given directory.  Ediff selects only the
+files that are under version control.
address@hidden edir-merge-revisions-with-ancestor
address@hidden ediff-merge-directory-revisions-with-ancestor
address@hidden edir-merge-revisions-with-ancestor
address@hidden ediff-merge-directory-revisions-with-ancestor
+ Merge versions of files in a given directory using other versions as
+ancestors.  Ediff selects only the files that are under version control.
+
address@hidden ediff-windows-wordwise
address@hidden ediff-windows-wordwise
+Compare windows word-by-word.
+
address@hidden ediff-windows-linewise
address@hidden ediff-windows-linewise
+Compare windows line-by-line.
+
address@hidden ediff-regions-wordwise
address@hidden ediff-regions-wordwise
+Compare regions word-by-word.  The regions can come from the same buffer
+and they can even overlap.  You will be asked to specify the buffers that
+contain the regions, which you want to compare. For each buffer, you will
+also be asked to mark the regions to be compared. Pay attention to the
+messages that appear in the minibuffer.
+
address@hidden ediff-regions-linewise
address@hidden ediff-regions-linewise
+Similar to @code{ediff-windows-linewise}, but compares the regions
+line-by-line. See @code{ediff-windows-linewise} for more details.
+
address@hidden ediff-revision
address@hidden ediff-revision
+ Compare versions of the current buffer, if the buffer is visiting
+ a file under version control.
+
address@hidden ediff-patch-file
address@hidden epatch
address@hidden ediff-patch-file
address@hidden epatch
+
+Patch a file or multiple files, then compare.  If the patch applies to just
+one file, Ediff will invoke a regular comparison session.  If it is a
+multi-file patch, then a session group interface will be used and the user
+will be able to patch the files selectively.  @xref{Session Groups}, for
+more details.
+
+Since the patch might be in a buffer or a file, you will be asked which is
+the case. To avoid this extra prompt, you can invoke this command with a
+prefix argument.  With an odd prefix argument, Ediff assumes the patch
+is in a file; with an even argument, a buffer is assumed.
+
+Note that @code{ediff-patch-file} will actually use the @code{patch}
+utility to change the original files on disk.  This is not that
+dangerous, since you will always have the original contents of the file
+saved in another file that has the extension @file{.orig}.
+Furthermore, if the file is under version control, then you can always back
+out to one of the previous versions (see the section on Version Control in
+the Emacs manual).
+
address@hidden is careful about versions control: if the file
+to be patched is checked in, then Ediff will offer to check it out, because
+failing to do so may result in the loss of the changes when the file is
+checked out the next time.
+
+If you don't intend to modify the file via the patch and just want to see
+what the patch is all about (and decide later), then
address@hidden might be a better choice.
+
address@hidden ediff-patch-buffer
address@hidden epatch-buffer
address@hidden ediff-patch-buffer
address@hidden epatch-buffer
+Patch a buffer, then compare.  The buffer being patched and the file visited
+by that buffer (if any) is @emph{not} modified.  The result of the patch
+appears in some other buffer that has the name ending with @emph{_patched}.
+
+This function would refuse to apply a multifile patch to a buffer.  Use
address@hidden for that (and when you want the original file to be
+modified by the @code{patch} utility).
+
+Since the patch might be in a buffer or a file, you will be asked which is
+the case. To avoid this extra prompt, you can invoke this command with a
+prefix argument.  With an odd prefix argument, Ediff assumes the patch
+is in a file; with an even argument, a buffer is assumed.
+
address@hidden ediff-merge-files
address@hidden ediff-merge
address@hidden ediff-merge-files
address@hidden ediff-merge
+Merge two files.
+
address@hidden ediff-merge-files-with-ancestor
address@hidden ediff-merge-with-ancestor
address@hidden ediff-merge-files-with-ancestor
address@hidden ediff-merge-with-ancestor
+Like @code{ediff-merge}, but with a third ancestor file.
+
address@hidden ediff-merge-buffers
address@hidden ediff-merge-buffers
+Merge two buffers.
+
address@hidden ediff-merge-buffers-with-ancestor
address@hidden ediff-merge-buffers-with-ancestor
+Same but with ancestor.
+
+
address@hidden edirs-merge
address@hidden ediff-merge-directories
address@hidden edirs-merge
address@hidden ediff-merge-directories
+ Merge files common to two directories.
address@hidden edirs-merge-with-ancestor
address@hidden ediff-merge-directories-with-ancestor
address@hidden edirs-merge-with-ancestor
address@hidden ediff-merge-directories-with-ancestor
+ Same but using files in a third directory as ancestors.
+ If a pair of files doesn't have an ancestor in the ancestor-directory, you
+ will still be able to merge them without the ancestor.
+
address@hidden ediff-merge-revisions
address@hidden ediff-merge-revisions
+Merge two versions of the file visited by the current buffer.
+
address@hidden ediff-merge-revisions-with-ancestor
address@hidden ediff-merge-revisions-with-ancestor
+Same but with ancestor.
+
address@hidden ediff-documentation
address@hidden ediff-documentation
+Brings up this manual.
+
address@hidden ediff-show-registry
address@hidden eregistry
+Brings up Ediff session registry.  This feature enables you to quickly find
+and restart active Ediff sessions.
address@hidden table
+
address@hidden
+If you want Ediff to be loaded from the very beginning of your Emacs
+session, you should put this line in your @file{~/.emacs} file:
+
address@hidden
+(require 'ediff)
address@hidden example
+
address@hidden
+Otherwise, Ediff will be loaded automatically when you use one of the
+above functions, either directly or through the menus.
+
+When the above functions are invoked, the user is prompted for all the
+necessary information---typically the files or buffers to compare, merge, or
+patch.  Ediff tries to be smart about these prompts.  For instance, in
+comparing/merging files, it will offer the visible buffers as defaults.  In
+prompting for files, if the user enters a directory, the previously input
+file name will be appended to that directory.  In addition, if the variable
address@hidden is not @code{nil}, Ediff will offer
+previously entered directories as defaults (which will be maintained
+separately for each type of file, A, B, or C).
address@hidden @code{ediff-use-last-dir}
+
+All the above functions use the POSIX @code{diff} or @code{diff3} programs
+to find differences between two files.  They process the @code{diff} output
+and display it in a convenient form.  At present, Ediff understands only
+the plain output from diff.  Options such as @samp{-c} are not supported,
+nor is the format produced by incompatible file comparison programs such as
+the VMS version of @code{diff}.
+
+The functions @code{ediff-files}, @code{ediff-buffers},
address@hidden, @code{ediff-buffers3} first display the coarse,
+line-based difference regions, as reported by the @code{diff} program.  The
+total number of difference regions and the current difference number are
+always displayed in the mode line of the control window.
+
+Since @code{diff} may report fairly large chunks of text as being different,
+even though the difference may be localized to just a few words or even
+to the white space or line breaks, Ediff further @emph{refines} the
+regions to indicate which exact words differ.  If the only difference is
+in the white space and line breaks, Ediff says so.
+
+On a color display, fine differences are highlighted with color; on a
+monochrome display, they are underlined.  @xref{Highlighting Difference
+Regions}, for information on how to customize this.
+
+The commands @code{ediff-windows-wordwise},
address@hidden, @code{ediff-regions-wordwise} and
address@hidden do comparison on parts of existing Emacs
+buffers.  The commands @code{ediff-windows-wordwise} and
address@hidden are intended for relatively small segments
+of buffers (e.g., up to 100 lines, depending on the speed of your machine),
+as they perform comparison on the basis of words rather than lines.
+(Word-wise comparison of large chunks of text can be slow.)
+
+To compare large regions, use @code{ediff-regions-linewise}.  This
+command displays differences much like @code{ediff-files} and
address@hidden
+
+The functions @code{ediff-patch-file} and @code{ediff-patch-buffer} apply a
+patch to a file or a buffer and then run Ediff on the appropriate
+files/buffers, displaying the difference regions.
+
+The entry points @code{ediff-directories}, @code{ediff-merge-directories},
+etc., provide a convenient interface for comparing and merging files in
+different directories.  The user is presented with Dired-like interface from
+which one can run a group of related Ediff sessions.
+
+For files under version control, @code{ediff-revision} lets you compare
+the file visited by the current buffer to one of its checked-in versions.
+You can also compare two checked-in versions of the visited file.
+Moreover, the functions @code{ediff-directory-revisions},
address@hidden, etc., let you run a group of
+related Ediff sessions by taking a directory and comparing (or merging)
+versions of files in that directory.
+
address@hidden Session Commands, Registry of Ediff Sessions, Major Entry 
Points, Top
address@hidden Session Commands
+
+All Ediff commands are displayed in a Quick Help window, unless you type
address@hidden to shrink the window to just one line.  You can redisplay the 
help
+window by typing @kbd{?} again.  The Quick Help commands are detailed below.
+
+Many Ediff commands take numeric prefix arguments.  For instance, if you
+type a number, say 3, and then @kbd{j} (@code{ediff-jump-to-difference}),
+Ediff moves to the third difference region.  Typing 3 and then @kbd{a}
+(@code{ediff-diff-to-diff}) copies the 3d difference region from variant A
+to variant B.  Likewise, 4 followed by @kbd{ra} restores the 4th difference
+region in buffer A (if it was previously written over via the command
address@hidden).
+
+Some commands take negative prefix arguments as well.  For instance, typing
address@hidden and then @kbd{j} will make the last difference region
+current.  Typing @kbd{-2} then @kbd{j} makes the penultimate difference
+region current, etc.
+
+Without the prefix argument, all commands operate on the currently
+selected difference region.  You can make any difference region
+current using the various commands explained below.
+
+For some commands, the actual value of the prefix argument is
+immaterial.  However, if supplied, the prefix argument may modify the
+command (see @kbd{ga}, @kbd{gb}, and @kbd{gc}).
+
address@hidden
+* Quick Help Commands::             Frequently used commands.
+* Other Session Commands::          Commands that are not bound to keys.
address@hidden menu
+
address@hidden Quick Help Commands,Other Session Commands,,Session Commands
address@hidden Quick Help Commands
+
address@hidden @kbd
address@hidden ?
address@hidden ?
+Toggles the Ediff Quick Help window ON and OFF.
address@hidden G
address@hidden G
+Prepares a mail buffer for sending a praise or a curse to the Ediff maintainer.
+
address@hidden E
address@hidden E
+Brings up the top node of this manual, where you can find further
+information on the various Ediff functions and advanced issues, such as
+customization, session groups, etc.
+
address@hidden v
address@hidden v
+Scrolls up buffers A and B (and buffer C where appropriate) in a
+coordinated fashion.
address@hidden V
address@hidden V
+Scrolls the buffers down.
+
address@hidden <
address@hidden <
+Scrolls the buffers to the left simultaneously.
address@hidden >
address@hidden >
+Scrolls buffers to the right.
+
address@hidden wd
address@hidden wd
+Saves the output from the diff utility, for further reference.
+
+With prefix argument, saves the plain output from @code{diff} (see
address@hidden and @code{ediff-diff-options}).  Without the
+argument, it saves customized @code{diff} output (see
address@hidden and @code{ediff-custom-diff-options}), if
+it is available.
+
address@hidden wa
address@hidden wa
+Saves buffer A, if it was modified.
address@hidden wb
address@hidden wb
+Saves buffer B, if it was modified.
address@hidden wc
address@hidden wc
+Saves buffer C, if it was modified (if you are in a session that
+compares three files simultaneously).
+
address@hidden a
address@hidden a
address@hidden comparison sessions:}
+Copies the current difference region (or the region specified as the prefix
+to this command) from buffer A to buffer B.
+Ediff saves the old contents of buffer B's region; it can
+be restored via the command @kbd{rb}, which see.
+
address@hidden merge sessions:}
+Copies the current difference region (or the region specified as the prefix
+to this command) from buffer A to the merge buffer.  The old contents of
+this region in buffer C can be restored via the command @kbd{r}.
+
address@hidden b
address@hidden b
+Works similarly, but copies the current difference region from buffer B to
+buffer A (in @emph{comparison sessions}) or the merge buffer (in
address@hidden sessions}).
+
+Ediff saves the old contents of the difference region copied over; it can
+be reinstated via the command @kbd{ra} in comparison sessions and
address@hidden in merge sessions.
+
address@hidden ab
address@hidden ab
+Copies the current difference region (or the region specified as the prefix
+to this command) from buffer A to buffer B.  This (and the next five)
+command is enabled only in sessions that compare three files
+simultaneously.  The old region in buffer B is saved and can be restored
+via the command @kbd{rb}.
address@hidden ac
address@hidden ac
+Copies the difference region from buffer A to buffer C.
+The old region in buffer C is saved and can be restored via the command
address@hidden
address@hidden ba
address@hidden ba
+Copies the difference region from buffer B to buffer A.
+The old region in buffer A is saved and can be restored via the command
address@hidden
address@hidden bc
address@hidden bc
+Copies the difference region from buffer B to buffer C.
+The command @kbd{rc} undoes this.
address@hidden ca
address@hidden ca
+Copies the difference region from buffer C to buffer A.
+The command @kbd{ra} undoes this.
address@hidden cb
address@hidden cb
+Copies the difference region from buffer C to buffer B.
+The command @kbd{rb} undoes this.
+
address@hidden p
address@hidden DEL
address@hidden p
address@hidden DEL
+Makes the previous difference region current.
address@hidden n
address@hidden SPC
address@hidden n
address@hidden SPC
+Makes the next difference region current.
+
address@hidden j
address@hidden -j
address@hidden Nj
address@hidden j
+Makes the very first difference region current.
+
address@hidden makes the last region current.  Typing a number, N, and then `j'
+makes the difference region N current.  Typing -N (a negative number) then
+`j' makes current the region Last - N.
+
address@hidden ga
address@hidden ga
+Makes current the difference region closest to the position of the point in
+buffer A.
+
+However, with a prefix argument, Ediff would position all variants
+around the area indicated by the current point in buffer A: if
+the point is inside a difference region, then the variants will be
+positioned at this difference region.  If the point is not in any difference
+region, then it is in an area where all variants agree with each other.  In
+this case, the variants will be positioned so that each would display this
+area (of agreement).
address@hidden gb
address@hidden gb
+Makes current the difference region closest to the position of the point in
+buffer B.
+
+With a prefix argument, behaves like @kbd{ga}, but with respect to buffer B.
address@hidden gc
address@hidden gc
address@hidden merge sessions:}
+makes current the difference region closest to the point in the merge buffer.
+
address@hidden 3-file comparison sessions:}
+makes current the region closest to the point in buffer C.
+
+With a prefix argument, behaves like @kbd{ga}, but with respect to buffer C.
+
address@hidden !
address@hidden !
+Recomputes the difference regions, bringing them up to date.  This is often
+needed because it is common to do all sorts of editing during Ediff
+sessions, so after a while, the highlighted difference regions may no
+longer reflect the actual differences among the buffers.
+
address@hidden *
address@hidden *
+Forces refinement of the current difference region, which highlights the exact
+words of disagreement among the buffers.  With a negative prefix argument,
+unhighlights the current region.
+
+Forceful refinement may be needed if Ediff encounters a difference region
+that is larger than @code{ediff-auto-refine-limit}.  In this situation,
+Ediff doesn't do automatic refinement in order to improve response time.
+(Ediff doesn't auto-refine on dumb terminals as well, but @kbd{*} still
+works there.  However, the only useful piece of information it can tell you
+is whether or not the difference regions disagree only in the amount of
+white space.)
+
+This command is also useful when the highlighted fine differences are
+no longer current, due to user editing.
+
address@hidden m
address@hidden m
+Displays the current Ediff session in a frame as wide as the physical
+display.  This is useful when comparing files side-by-side.  Typing `m' again
+restores the original size of the frame.
+
address@hidden |
address@hidden |
+Toggles the horizontal/vertical split of the Ediff display.  Horizontal
+split is convenient when it is possible to compare files
+side-by-side.  If the frame in which files are displayed is too narrow
+and lines are cut off, typing @kbd{m} may help some.
+
address@hidden @@
address@hidden @@
+Toggles auto-refinement of difference regions (i.e., automatic highlighting
+of the exact words that differ among the variants).  Auto-refinement is
+turned off on devices where Emacs doesn't support highlighting.
+
+On slow machines, it may be advantageous to turn auto-refinement off.  The
+user can always forcefully refine specific difference regions by typing
address@hidden
+
address@hidden h
address@hidden h
+Cycles between full highlighting, the mode where fine differences are not
+highlighted (but computed), and the mode where highlighting is done with
address@hidden strings.  The latter is not really recommended, unless on a dumb 
TTY.
+
address@hidden r
address@hidden r
+Restores the old contents of the region in the merge buffer.
+(If you copied a difference region from buffer A or B into the merge buffer
+using the commands @kbd{a} or @kbd{b}, Ediff saves the old contents of the
+region in case you change your mind.)
+
+This command is enabled in merge sessions only.
+
address@hidden ra
address@hidden ra
+Restores the old contents of the current difference region in buffer A,
+which was previously saved when the user invoked one of these commands:
address@hidden, @kbd{ba}, @kbd{ca}, which see.  This command is enabled in
+comparison sessions only.
address@hidden rb
address@hidden rb
+Restores the old contents of the current difference region in buffer B,
+which was previously saved when the user invoked one of these commands:
address@hidden, @kbd{ab}, @kbd{cb}, which see.  This command is enabled in
+comparison sessions only.
address@hidden rc
address@hidden rc
+Restores the old contents of the current difference region in buffer C,
+which was previously saved when the user invoked one of these commands:
address@hidden, @kbd{bc}, which see.  This command is enabled in 3-file
+comparison sessions only.
+
address@hidden ##
address@hidden ##
+Tell Ediff to skip over regions that disagree among themselves only in the
+amount of white space and line breaks.
+
+Even though such regions will be skipped over, you can still jump to any
+one of them by typing the region number and then `j'.  Typing @kbd{##}
+again puts Ediff back in the original state.
+
address@hidden #c
address@hidden #c
address@hidden ediff-ignore-case-option
address@hidden ediff-ignore-case-option3
address@hidden ediff-ignore-case
+Toggle case sensitivity in the diff program. All diffs are recomputed.
+Case sensitivity is controlled by the variables
address@hidden, @code{ediff-ignore-case-option3},
+and @code{ediff-ignore-case}, which are explained elsewhere.
+
address@hidden #h
address@hidden #f
address@hidden #f
address@hidden #h
+Ediff works hard to ameliorate the effects of boredom in the workplace...
+
+Quite often differences are due to identical replacements (e.g., the word
+`foo' is replaced with the word `bar' everywhere).  If the number of regions
+with such boring differences exceeds your tolerance threshold, you may be
+tempted to tell Ediff to skip these regions altogether (you will still be able
+to jump to them via the command @kbd{j}).  The above commands, @kbd{#h}
+and @kbd{#f}, may well save your day!
+
address@hidden prompts you to specify regular expressions for each
+variant.  Difference regions where each variant's region matches the
+corresponding regular expression will be skipped from then on.  (You can
+also tell Ediff to skip regions where at least one variant matches its
+regular expression.)
+
address@hidden does dual job: it focuses on regions that match the corresponding
+regular expressions.  All other regions will be skipped
+over.  @xref{Selective Browsing}, for more.
+
address@hidden A
address@hidden A
+Toggles the read-only property in buffer A.
+If file A is under version control and is checked in, it is checked out
+(with your permission).
address@hidden B
address@hidden B
+Toggles the read-only property in buffer B.
+If file B is under version control and is checked in, it is checked out.
address@hidden C
address@hidden C
+Toggles the read-only property in buffer C (in 3-file comparison sessions).
+If file C is under version control and is checked in, it is checked out.
+
address@hidden ~
address@hidden ~
+Swaps the windows where buffers A and B are displayed.  If you are comparing
+three buffers at once, then this command would rotate the windows among
+buffers A, B, and C.
+
address@hidden i
address@hidden i
+Displays all kinds of useful data about the current Ediff session.
address@hidden D
address@hidden D
+Runs @code{ediff-custom-diff-program} on the variants and displays the
+buffer containing the output.  This is useful when you must send the output
+to your Mom.
+
+With a prefix argument, displays the plain @code{diff} output.
address@hidden and Diff Programs}, for details.
+
address@hidden R
address@hidden R
+Displays a list of currently active Ediff sessions---the Ediff Registry.
+You can then restart any of these sessions by either clicking on a session
+record or by putting the cursor over it and then typing the return key.
+
+(Some poor souls leave so many active Ediff sessions around that they loose
+track of them completely...  The `R' command is designed to save these
+people from the recently discovered Ediff Proficiency Syndrome.)
+
+Typing @kbd{R} brings up Ediff Registry only if it is typed into an Ediff
+Control Panel.  If you don't have a control panel handy, type this in the
+minibuffer: @kbd{M-x eregistry}.  @xref{Registry of Ediff Sessions}.
+
address@hidden M
address@hidden M
+Shows the session group buffer that invoked the current Ediff session.
address@hidden Groups}, for more information on session groups.
+
address@hidden z
address@hidden z
+Suspends the current Ediff session.  (If you develop a condition known as
+Repetitive Ediff Injury---a serious but curable illness---you must change
+your current activity.  This command tries hard to hide all Ediff-related
+buffers.)
+
+The easiest way to resume a suspended Ediff session is through the registry
+of active sessions.  @xref{Registry of Ediff Sessions}, for details.
address@hidden q
address@hidden q
+Terminates this Ediff session.  With a prefix argument (e.g.,@kbd{1q}), asks
+if you also want to delete the buffers of the variants.
+Modified files and the results of merges are never deleted.
+
address@hidden %
address@hidden %
+Toggles narrowing in Ediff buffers.  Ediff buffers may be narrowed if you
+are comparing only parts of these buffers via the commands
address@hidden and @code{ediff-regions-*}, which see.
+
address@hidden C-l
address@hidden C-l
+Restores the usual Ediff window setup.  This is the quickest way to resume
+an Ediff session, but it works only if the control panel of that session is
+visible.
+
address@hidden $$
address@hidden $$
+While merging with an ancestor file, Ediff is determined to reduce user's
+wear and tear by saving him and her much of unproductive, repetitive
+typing.  If it notices that, say, file A's difference region is identical to
+the same difference region in the ancestor file, then the merge buffer will
+automatically get the difference region taken from buffer B.  The rationale
+is that this difference region in buffer A is as old as that in the
+ancestor buffer, so the contents of that region in buffer B represents real
+change.
+
+You may want to ignore such `obvious' merges and concentrate on difference
+regions where both files `clash' with the ancestor, since this means that
+two different people have been changing this region independently and they
+had different ideas on how to do this.
+
+The above command does this for you by skipping the regions where only one
+of the variants clashes with the ancestor but the other variant agrees with
+it.  Typing @kbd{$$} again undoes this setting.
+
address@hidden $*
address@hidden $*
+When merging files with large number of differences, it is sometimes
+convenient to be able to skip the difference regions for which you already
+decided which variant is most appropriate. Typing @kbd{$*} will accomplish
+precisely this.
+
+To be more precise, this toggles the check for whether the current merge is
+identical to its default setting, as originally decided by Ediff.  For
+instance, if Ediff is merging according to the `combined' policy, then the
+merge region is skipped over if it is different from the combination of the
+regions in buffers A and B.  (Warning: swapping buffers A and B will confuse
+things in this respect.)  If the merge region is marked as `prefer-A' then
+this region will be skipped if it differs from the current difference
+region in buffer A, etc.
+
address@hidden /
address@hidden /
+Displays the ancestor file during merges.
address@hidden &
address@hidden &
+In some situations, such as when one of the files agrees with the ancestor file
+on a difference region and the other doesn't, Ediff knows what to do: it copies
+the current difference region from the second buffer into the merge buffer.
+
+In other cases, the right course of action is not that clearcut, and Ediff
+would use a default action.  The above command changes the default action.
+The default action can be @samp{default-A} (choose the region from buffer
+A), @samp{default-B} (choose the region from buffer B), or @samp{combined}
+(combine the regions from the two buffers).
address@hidden and diff3}, for further details.
+
+The command @kbd{&} also affects the regions in the merge buffers that have
address@hidden, @samp{default-B}, or @samp{combined} status, provided
+they weren't changed with respect to the original.  For instance, if such a
+region has the status @samp{default-A} then changing the default action to
address@hidden will also replace this merge-buffer's region with the
+corresponding region from buffer B.
+
address@hidden s
address@hidden s
+Causes the merge window shrink to its minimum size, thereby exposing as much
+of the variant buffers as possible.  Typing `s' again restores
+the original size of that window.
+
+With a positive prefix argument, this command enlarges the merge window.
+E.g., @kbd{4s} increases the size of the window by about 4 lines, if
+possible.  With a negative numeric argument, the size of the merge window
+shrinks by that many lines, if possible.  Thus, @kbd{-s} shrinks the window
+by about 1 line and @kbd{-3s} by about 3 lines.
+
+This command is intended only for temporary viewing; therefore, Ediff
+restores window C to its original size whenever it makes any other change
+in the window configuration.  However, redisplaying (@kbd{C-l}) or jumping
+to another difference does not affect window C's size.
+
+The split between the merge window and the variant windows is controlled by
+the variable @code{ediff-merge-window-share}, which see.
+
address@hidden +
address@hidden +
+Combines the difference regions from buffers A and B and copies the
+result into the merge buffer.  @xref{Merging and diff3}, and the
+variables @code{ediff-combine-diffs} and @code{ediff-combination-pattern}.
+
+
address@hidden =
address@hidden =
+You may run into situations when a large chunk of text in one file has been
+edited and then moved to a different place in another file.  In such a case,
+these two chunks of text are unlikely to belong to the same difference
+region, so the refinement feature of Ediff will not be able to tell you
+what exactly differs inside these chunks.  Since eyeballing large pieces of
+text is contrary to human nature, Ediff has a special command to help
+reduce the risk of developing a cataract.
+
+In other situations, the currently highlighted region might be big and you
+might want to reconcile of them interactively.
+
+All of this can be done with the above command, @kbd{=}, which
+compares regions within Ediff buffers.  Typing @kbd{=} creates a
+child Ediff session for comparing regions in buffers A, B, or
+C as follows.
+
+First, you will be asked whether you want to compare the fine differences
+between the currently highlighted buffers on a word-by-word basis. If you
+accept, a child Ediff session will start using the currently highlighted
+regions. Ediff will let you step over the differences word-wise.
+
+If you reject the offer, you will be asked to select regions of your choice.
+
address@hidden you are comparing 2 files or buffers:}
+Ediff will ask you to select regions in buffers A and B.
+
address@hidden you are comparing 3 files or buffers simultaneously:} Ediff will
+ask you to choose buffers and then select regions inside those buffers.
+
address@hidden you are merging files or buffers (with or without ancestor):}
+Ediff will ask you to choose which buffer (A or B) to compare with the
+merge buffer and then select regions in those buffers.
+
address@hidden table
+
address@hidden Other Session Commands,,Quick Help Commands,Session Commands
address@hidden Other Session Commands
+
+The following commands can be invoked from within any Ediff session,
+although some of them are not bound to a key.
+
address@hidden @code
address@hidden eregistry
address@hidden ediff-show-registry
address@hidden eregistry
address@hidden ediff-show-registry
+This command brings up the registry of active Ediff sessions.  Ediff
+registry is a device that can be used to resume any active Ediff session
+(which may have been postponed because the user switched to some other
+activity).  This command is also useful for switching between multiple
+active Ediff sessions that are run at the same time.  The function
address@hidden is an alias for @code{ediff-show-registry}.
address@hidden of Ediff Sessions}, for more information on this registry.
+
address@hidden ediff-toggle-multiframe
address@hidden ediff-toggle-multiframe
+Changes the display from the multi-frame mode (where the quick help window
+is in a separate frame) to the single-frame mode (where all Ediff buffers
+share the same frame), and vice versa.  See
address@hidden for details on how to make either of
+these modes the default one.
+
+This function can also be invoked from the Menubar.  However, in some
+cases, the change will take place only after you execute one of the Ediff
+commands, such as going to the next difference or redisplaying.
+
address@hidden ediff-toggle-use-toolbar
address@hidden ediff-toggle-use-toolbar
+Available in XEmacs only.  The Ediff toolbar provides quick access to some
+of the common Ediff functions.  This function toggles the display of the
+toolbar.  If invoked from the menubar, the function may take sometimes
+effect only after you execute an Ediff command, such as going to the next
+difference.
+
address@hidden ediff-use-toolbar-p
address@hidden ediff-use-toolbar-p
+The use of the toolbar can also be specified via the variable
address@hidden (default is @code{t}).  This variable can be set
+only in @file{.emacs} --- do @strong{not} change it interactively.  Use the
+function @code{ediff-toggle-use-toolbar} instead.
+
address@hidden ediff-revert-buffers-then-recompute-diffs
address@hidden ediff-revert-buffers-then-recompute-diffs
+This command reverts the buffers you are comparing and recomputes their
+differences.  It is useful when, after making changes, you decided to
+make a fresh start, or if at some point you changed the files being
+compared but want to discard any changes to comparison buffers that were
+done since then.
+
+This command normally asks for confirmation before reverting files.
+With a prefix argument, it reverts files without asking.
+
+
address@hidden ediff-profile
address@hidden ediff-profile
+Ediff has an admittedly primitive (but useful) facility for profiling
+Ediff's commands.  It is meant for Ediff maintenance---specifically, for
+making it run faster.  The function @code{ediff-profile} toggles
+profiling of ediff commands.
address@hidden table
+
address@hidden Registry of Ediff Sessions, Session Groups, Session Commands, Top
address@hidden Registry of Ediff Sessions
+
+Ediff maintains a registry of all its invocations that are
+still @emph{active}.  This feature is very convenient for switching among
+active Ediff sessions or for quickly restarting a suspended Ediff session.
+
+The focal point of this activity is a buffer
+called @emph{*Ediff Registry*}.  You can display this buffer by typing
address@hidden in any Ediff Control Buffer or Session Group Buffer
+(@pxref{Session Groups}), or by typing
address@hidden eregistry} into the Minibuffer.
+The latter would be the fastest way to bring up the registry
+buffer if no control or group buffer is displayed in any of the visible
+Emacs windows.
+If you are in a habit of running multiple long Ediff sessions and often need to
+suspend, resume, or switch between them, it may be a good idea to have the
+registry buffer permanently displayed in a separate, dedicated window.
+
+The registry buffer has several convenient key bindings.
+For instance, clicking mouse button 2 or typing
address@hidden or @kbd{v} over any session record resumes that session.
+Session records in the registry buffer provide a fairly complete
+description of each session, so it is usually easy to identify the right
+session to resume.
+
+Other useful commands are bound to @kbd{SPC} (next registry record)
+and @kbd{DEL} (previous registry record).  There are other commands as well,
+but you don't need to memorize them, since they are listed at the top of
+the registry buffer.
+
address@hidden Session Groups, Remote and Compressed Files, Registry of Ediff 
Sessions, Top
address@hidden Session Groups
+
+Several major entries of Ediff perform comparison and merging on
+directories.  On entering @code{ediff-directories},
address@hidden,
address@hidden,
address@hidden,
address@hidden,
address@hidden, or
address@hidden,
+the user is presented with a
+Dired-like buffer that lists files common to the directories involved along
+with their sizes.  (The list of common files can be further filtered through
+a regular expression, which the user is prompted for.)  We call this buffer
address@hidden Group Panel} because all Ediff sessions associated with the
+listed files will have this buffer as a common focal point.
+
+Clicking button 2 or typing @kbd{RET} or @kbd{v} over a
+record describing files invokes Ediff in the appropriate mode on these
+files.  You can come back to the session group buffer associated with a
+particular invocation of Ediff by typing @kbd{M} in Ediff control buffer of
+that invocation.
+
+Many commands are available in the session group buffer; some are
+applicable only to certain types of work.  The relevant commands are always
+listed at the top of each session group buffer, so there is no need to
+memorize them.
+
+In directory comparison or merging, a session group panel displays only the
+files common to all directories involved.  The differences are kept in a
+separate @emph{directory difference buffer} and are conveniently displayed
+by typing @kbd{D} to the corresponding session group panel.  Thus, as an
+added benefit, Ediff can be used to compare the contents of up to three
+directories.
+
address@hidden Directory difference buffer
+Sometimes it is desirable to copy some files from one directory to another
+without exiting Ediff. The @emph{directory difference buffer}, which is
+displayed by typing @kbd{D} as discussed above, can be used for this
+purpose. If a file is, say, in Ediff's Directory A, but is missing in
+Ediff's Directory B (Ediff will refuse to override existing files), then
+typing @kbd{C} or clicking mouse button 2 over that file (which must be
+displayed in directory difference buffer) will copy that file from
+Directory A to Directory B.
+
+Session records in session group panels are also marked with @kbd{+}, for
+active sessions, and with @kbd{-}, for finished sessions.
+
+Sometimes, it is convenient to exclude certain sessions from a group.
+Usually this happens when the user doesn't intend to run Ediff of certain
+files in the group, and the corresponding session records just add clutter
+to the session group buffer.  To help alleviate this problem, the user can
+type @kbd{h} to mark a session as a candidate for exclusion and @kbd{x} to
+actually hide the marked sessions.  There actions are reversible: with a
+prefix argument, @kbd{h} unmarks the session under the cursor, and @kbd{x}
+brings the hidden sessions into the view (@kbd{x} doesn't unmark them,
+though, so the user has to explicitly unmark the sessions of interest).
+
+Group sessions also understand the command @kbd{m}, which marks sessions
+for future operations (other than hiding) on a group of sessions.  At present,
+the only such group-level operation is the creation of a multi-file patch.
+
address@hidden ediff-autostore-merges
+For group sessions created to merge files, Ediff can store all merges
+automatically in a directory.  The user is asked to specify such directory
+if the value of @code{ediff-autostore-merges} is address@hidden  If the value 
is
address@hidden, nothing is done to the merge buffers---it will be the user's
+responsibility to save them.  If the value is @code{t}, the user will be
+asked where to save the merge buffers in all merge jobs, even those that do
+not originate from a session group.  It the value is neither @code{nil} nor
address@hidden, the merge buffer is saved @emph{only} if this merge session was
+invoked from a session group.  This behavior is implemented in the function
address@hidden, which is a hook in
address@hidden  The user can supply a different hook, if
+necessary.
+
+The variable @code{ediff-autostore-merges} is buffer-local, so it can be
+set on a per-buffer basis.  Therefore, use @code{setq-default} to change
+this variable globally.
+
address@hidden Multi-file patches
+A multi-file patch is a concatenated output of several runs of the Unix
address@hidden command (some versions of @code{diff} let you create a
+multi-file patch in just one run).  Ediff facilitates creation of
+multi-file patches as follows.  If you are in a session group buffer
+created in response to @code{ediff-directories} or
address@hidden, you can mark (by typing @kbd{m}) the
+desired Ediff sessions and then type @kbd{P} to create a
+multi-file patch of those marked sessions.
+Ediff will then display a buffer containing the patch.
+The patch is generated by invoking @code{diff} on all marked individual
+sessions (represented by files) and session groups (represented by
+directories).  Ediff will also recursively descend into any @emph{unmarked}
+session group and will search for marked sessions there.  In this way, you
+can create multi-file patches that span file subtrees that grow out of
+any given directory.
+
+In an @code{ediff-directories} session, it is enough to just mark the
+requisite sessions.  In @code{ediff-directory-revisions} revisions, the
+marked sessions must also be active, or else Ediff will refuse to produce a
+multi-file patch.  This is because, in the latter-style sessions, there are
+many ways to create diff output, and it is easier to handle by running
+Ediff on the inactive sessions.
+
+Last, but not least, by typing @kbd{==}, you can quickly find out which
+sessions have identical entries, so you won't have to run Ediff on those
+sessions.  This, however, works only on local, uncompressed files.
+For compressed or remote files, this command won't report anything.
+Likewise, you can use @kbd{=h} to mark sessions with identical entries
+for hiding or, with @kbd{=m}, for further operations.
+
+The comparison operations @kbd{==}, @kbd{=h}, and @kbd{=m} can recurse into
+subdirectories to see if they have identical contents (so the user will not
+need to descend into those subdirectories manually). These commands ask the
+user whether or not to do a recursive descent.
+
+
+
address@hidden Remote and Compressed Files, Customization, Session Groups, Top
address@hidden Remote and Compressed Files
+
+Ediff works with remote, compressed, and encrypted files.  Ediff
+supports @file{ange-ftp.el}, @file{jka-compr.el}, @file{uncompress.el}
+and @file{crypt++.el}, but it may work with other similar packages as
+well.  This means that you can compare files residing on another
+machine, or you can apply a patch to a file on another machine.  Even
+the patch itself can be a remote file!
+
+When patching compressed or remote files, Ediff does not rename the source
+file (unlike what the @code{patch} utility would usually do).  Instead, the
+source file retains its name and the result of applying the patch is placed
+in a temporary file that has the suffix @file{_patched} attached.
+Generally, this applies to files that are handled using black magic, such
+as special file handlers (ange-ftp and some compression and encryption
+packages also use this method).
+
+Regular files are treated by the @code{patch} utility in the usual manner,
+i.e., the original is renamed into @file{source-name.orig} and the result
+of the patch is placed into the file source-name (@file{_orig} is used
+on systems like VMS, DOS, etc.)
+
address@hidden Customization, Credits, Remote and Compressed Files, Top
address@hidden Customization
+
+Ediff has a rather self-explanatory interface, and in most cases you
+won't need to change anything.  However, should the need arise, there are
+extensive facilities for changing the default behavior.
+
+Most of the customization can be done by setting various variables in the
address@hidden file.  Some customization (mostly window-related
+customization and faces) can be done by putting appropriate lines in
address@hidden, @file{.xrdb}, or whatever X resource file is in use.
+
+With respect to the latter, please note that the X resource
+for Ediff customization is `Ediff', @emph{not} `emacs'.
address@hidden and Frame Configuration},
address@hidden Difference Regions}, for further details.  Please also
+refer to Emacs manual for the information on how to set Emacs X resources.
+
address@hidden
+* Hooks::                       Customization via the hooks.
+* Quick Help Customization::    How to customize Ediff's quick help feature.
+* Window and Frame Configuration::  Controlling the way Ediff displays things.
+* Selective Browsing::          Advanced browsing through difference regions.
+* Highlighting Difference Regions::  Controlling highlighting.
+* Narrowing::                   Comparing regions, windows, etc.
+* Refinement of Difference Regions::  How to control the refinement process.
+* Patch and Diff Programs::     Changing the utilities that compute differences
+                                and apply patches.
+* Merging and diff3::           How to customize Ediff in its Merge Mode.
+* Support for Version Control::  Changing the version control package.
+                                 You are not likely to do that.
+* Customizing the Mode Line::   Changing the look of the mode line in Ediff.
+* Miscellaneous::               Other customization.
+* Notes on Heavy-duty Customization::  Customization for the gurus.
address@hidden menu
+
address@hidden Hooks, Quick Help Customization, Customization, Customization
address@hidden Hooks
+
+The bulk of customization can be done via the following hooks:
+
address@hidden @code
address@hidden ediff-load-hook
address@hidden ediff-load-hook
+This hook can be used to change defaults after Ediff is loaded.
+
address@hidden ediff-before-setup-hook
address@hidden ediff-before-setup-hook
+Hook that is run just before Ediff rearranges windows to its liking.
+Can be used to save windows configuration.
+
address@hidden ediff-keymap-setup-hook
address@hidden ediff-keymap-setup-hook
address@hidden ediff-mode-map
+This hook can be used to alter bindings in Ediff's keymap,
address@hidden  These hooks are
+run right after the default bindings are set but before
address@hidden  The regular user needs not be concerned with this
+hook---it is provided for implementors of other Emacs packages built on top
+of Ediff.
+
address@hidden ediff-before-setup-windows-hook
address@hidden ediff-after-setup-windows-hook
address@hidden ediff-before-setup-windows-hook
address@hidden ediff-after-setup-windows-hook
+These two hooks are called before and after Ediff sets up its window
+configuration.  These hooks are run each time Ediff rearranges windows to
+its liking. This happens whenever it detects that the user changed the
+windows setup.
+
address@hidden ediff-suspend-hook
address@hidden ediff-quit-hook
address@hidden ediff-suspend-hook
address@hidden ediff-quit-hook
+These two hooks are run when you suspend or quit Ediff.  They can be
+used to set desired window configurations, delete files Ediff didn't
+want to clean up after exiting, etc.
+
+By default, @code{ediff-quit-hook} holds one hook function,
address@hidden, which cleans after Ediff, as appropriate in
+most cases.  You probably won't want to change it, but you might
+want to add other hook functions.
+
+Keep in mind that hooks executing before @code{ediff-cleanup-mess} start
+in @code{ediff-control-buffer;} they should also leave
address@hidden as the current buffer when they finish.
+Hooks that are executed after @code{ediff-cleanup-mess} should expect
+the current buffer be either buffer A or buffer B.
address@hidden doesn't kill the buffers being compared or
+merged (see @code{ediff-cleanup-hook}, below).
+
address@hidden ediff-cleanup-hook
address@hidden ediff-cleanup-hook
+This hook is run just before @code{ediff-quit-hook}.  This is a good
+place to do various cleanups, such as deleting the variant buffers.
+Ediff provides a function, @code{ediff-janitor}, as one such possible
+hook, which you can add to @code{ediff-cleanup-hook} with
address@hidden
+
address@hidden ediff-janitor
+This function kills buffers A, B, and, possibly, C, if these buffers aren't
+modified.  In merge jobs, buffer C is never deleted.  However, the side
+effect of using this function is that you may not be able to compare the
+same buffer in two separate Ediff sessions: quitting one of them will
+delete this buffer in another session as well.
+
address@hidden ediff-quit-merge-hook
address@hidden ediff-quit-merge-hook
address@hidden ediff-autostore-merges
address@hidden ediff-maybe-save-and-delete-merge
+This hook is called when Ediff quits a merge job.  By default, the value is
address@hidden, which is a function that attempts
+to save the merge buffer according to the value of
address@hidden, as described later.
+
address@hidden ediff-before-setup-control-frame-hook
address@hidden ediff-after-setup-control-frame-hook
address@hidden ediff-before-setup-control-frame-hook
address@hidden ediff-after-setup-control-frame-hook
+These two hooks run before and after Ediff sets up the control frame.
+They can be used to relocate Ediff control frame when Ediff runs in a
+multiframe mode (i.e., when the control buffer is in its own dedicated
+frame).  Be aware that many variables that drive Ediff are local to
+Ediff Control Panel (@code{ediff-control-buffer}), which requires
+special care in writing these hooks.  Take a look at
address@hidden and @code{ediff-default-quit-hook} to
+see what's involved.
+
address@hidden ediff-startup-hook
address@hidden ediff-startup-hook
+This hook is run at the end of Ediff startup.
+
address@hidden ediff-select-hook
address@hidden ediff-select-hook
+This hook is run after Ediff selects the next difference region.
+
address@hidden ediff-unselect-hook
address@hidden ediff-unselect-hook
+This hook is run after Ediff unselects the current difference region.
+
address@hidden ediff-prepare-buffer-hook
address@hidden ediff-prepare-buffer-hook
+This hook is run for each Ediff buffer (A, B, C) right after the buffer
+is arranged.
+
address@hidden ediff-display-help-hook
address@hidden ediff-display-help-hook
+Ediff runs this hook each time after setting up the help message.  It
+can be used to alter the help message for custom packages that run on
+top of Ediff.
+
address@hidden ediff-mode-hook
address@hidden ediff-mode-hook
+This hook is run just after Ediff mode is set up in the control
+buffer.  This is done before any Ediff window is created.  You can use it to
+set local variables that alter the look of the display.
+
address@hidden ediff-registry-setup-hook
address@hidden ediff-registry-setup-hook
+Hooks run after setting up the registry for all active Ediff session.
address@hidden Groups}, for details.
address@hidden ediff-before-session-group-setup-hook
address@hidden ediff-before-session-group-setup-hook
+Hooks run before setting up a control panel for a group of related Ediff
+sessions. Can be used, for example, to save window configuration to restore
+later.
address@hidden ediff-after-session-group-setup-hook
address@hidden ediff-after-session-group-setup-hook
+Hooks run after setting up a control panel for a group of related Ediff
+sessions.  @xref{Session Groups}, for details.
address@hidden ediff-quit-session-group-hook
address@hidden ediff-quit-session-group-hook
+Hooks run just before exiting a session group.
address@hidden ediff-meta-buffer-keymap-setup-hook
address@hidden ediff-meta-buffer-keymap-setup-hook
address@hidden ediff-meta-buffer-map
+Hooks run just after setting up the @code{ediff-meta-buffer-map} --- the
+map that controls key bindings in the meta buffer.  Since
address@hidden is a local variable, you can set different
+bindings for different kinds of meta buffers.
address@hidden table
+
address@hidden Quick Help Customization, Window and Frame Configuration, Hooks, 
Customization
address@hidden Quick Help Customization
address@hidden ediff-use-long-help-message
address@hidden ediff-control-buffer
address@hidden ediff-startup-hook
address@hidden ediff-help-message
+
+Ediff provides quick help using its control panel window.  Since this window
+takes a fair share of the screen real estate, you can toggle it off by
+typing @kbd{?}.  The control window will then shrink to just one line and a
+mode line, displaying a short help message.
+
+The variable @code{ediff-use-long-help-message} tells Ediff whether
+you use the short message or the long one.  By default, it
+is set to @code{nil}, meaning that the short message is used.
+Set this to @code{t}, if you want Ediff to use the long
+message by default.  This property can always be changed interactively, by
+typing @kbd{?} into Ediff Control Buffer.
+
+If you want to change the appearance of the help message on a per-buffer
+basis, you must use @code{ediff-startup-hook} to change the value of
+the variable @code{ediff-help-message}, which is local to
address@hidden
+
address@hidden Window and Frame Configuration, Selective Browsing, Quick Help 
Customization, Customization
address@hidden Window and Frame Configuration
+
+On a non-windowing display, Ediff sets things up in one frame, splitting
+it between a small control window and the windows for buffers A, B, and C.
+The split between these windows can be horizontal or
+vertical, which can be changed interactively by typing @kbd{|} while the
+cursor is in the control window.
+
+On a window display, Ediff sets up a dedicated frame for Ediff Control
+Panel and then it chooses windows as follows: If one of the buffers
+is invisible, it is displayed in the currently selected frame.  If
+a buffer is visible, it is displayed in the frame where it is visible.
+If, according to the above criteria, the two buffers fall into the same
+frame, then so be it---the frame will be shared by the two.  The same
+algorithm works when you type @kbd{C-l} (@code{ediff-recenter}), @kbd{p}
+(@code{ediff-previous-difference}), @kbd{n}
+(@code{ediff-next-difference}), etc.
+
+The above behavior also depends on whether the current frame is splittable,
+dedicated, etc.  Unfortunately, the margin of this book is too narrow to
+present the details of this remarkable algorithm.
+
+The upshot of all this is that you can compare buffers in one frame or
+in different frames.  The former is done by default, while the latter can
+be achieved by arranging buffers A, B (and C, if applicable) to be seen in
+different frames.  Ediff respects these arrangements, automatically
+adapting itself to the multi-frame mode.
+
+Ediff uses the following variables to set up its control panel
+(a.k.a.@: control buffer, a.k.a.@: quick help window):
+
address@hidden @code
address@hidden ediff-control-frame-parameters
address@hidden ediff-control-frame-parameters
+You can change or augment this variable including the font, color,
+etc.  The X resource name of Ediff Control Panel frames is @samp{Ediff}.  Under
+X-windows, you can use this name to set up preferences in your
address@hidden/.Xdefaults}, @file{~/.xrdb}, or whatever X resource file is in
+use.  Usually this is preferable to changing
address@hidden directly.  For instance, you can
+specify in @file{~/.Xdefaults} the color of the control frame
+using the resource @samp{Ediff*background}.
+
+In general, any X resource pertaining the control frame can be reached
+via the prefix @code{Ediff*}.
+
address@hidden ediff-control-frame-position-function
address@hidden ediff-control-frame-position-function
+The preferred way of specifying the position of the control frame is by
+setting the variable @code{ediff-control-frame-position-function} to an
+appropriate function.
+The default value of this variable is
address@hidden  This function places the control frame in
+the vicinity of the North-East corner of the frame displaying buffer A.
+
address@hidden ediff-make-frame-position
address@hidden table
+
+The following variables can be used to adjust the location produced by
address@hidden and for related customization.
+
address@hidden @code
address@hidden ediff-narrow-control-frame-leftward-shift
address@hidden ediff-narrow-control-frame-leftward-shift
+Specifies the number of characters for shifting
+the control frame from the rightmost edge of frame A when the control
+frame is displayed as a small window.
+
address@hidden ediff-wide-control-frame-rightward-shift
address@hidden ediff-wide-control-frame-rightward-shift
+Specifies the rightward shift of the control frame
+from the left edge of frame A when the control frame shows the full
+menu of options.
+
address@hidden ediff-control-frame-upward-shift
address@hidden ediff-control-frame-upward-shift
+Specifies the number of pixels for the upward shift
+of the control frame.
+
address@hidden ediff-prefer-iconified-control-frame
address@hidden ediff-prefer-iconified-control-frame
+If this variable is @code{t}, the control frame becomes iconified
+automatically when you toggle the quick help message off.  This saves
+valuable real estate on the screen.  Toggling help back will deiconify
+the control frame.
+
+To start Ediff with an iconified Control Panel, you should set this
+variable to @code{t} and @code{ediff-prefer-long-help-message} to
address@hidden (@pxref{Quick Help Customization}).  This behavior is useful
+only if icons are allowed to accept keyboard input (which depends on the
+window manager and other factors).
address@hidden table
+
address@hidden ediff-setup-windows
+To make more creative changes in the way Ediff sets up windows, you can
+rewrite the function @code{ediff-setup-windows}.  However, we believe
+that detaching Ediff Control Panel from the rest and making it into a
+separate frame offers an important opportunity by allowing you to
+iconify that frame.  The icon will usually accept all of the Ediff
+commands, but will free up valuable real estate on your screen (this may
+depend on your window manager, though).
+
+The following variable controls how windows are set up:
+
address@hidden @code
address@hidden ediff-window-setup-function
address@hidden ediff-window-setup-function
+The multiframe setup is done by the
address@hidden function, which is the default on
+windowing displays.  The plain setup, one where all windows are always
+in one frame, is done by @code{ediff-setup-windows-plain}, which is the
+default on a non-windowing display (or in an xterm window).  In fact,
+under Emacs, you can switch freely between these two setups by executing
+the command @code{ediff-toggle-multiframe} using the Minibuffer of the
+Menubar.
address@hidden ediff-setup-windows-multiframe
address@hidden ediff-setup-windows-plain
address@hidden ediff-toggle-multiframe
+
+If you don't like any of these setups, write your own function.  See the
+documentation for @code{ediff-window-setup-function} for the basic
+guidelines.  However, writing window setups is not easy, so you should
+first take a close look at @code{ediff-setup-windows-plain} and
address@hidden
address@hidden table
+
+You can run multiple Ediff sessions at once, by invoking Ediff several
+times without exiting previous Ediff sessions.  Different sessions
+may even operate on the same pair of files.
+
+Each session has its own Ediff Control Panel and all the regarding a
+particular session is local to the associated control panel buffer.  You
+can switch between sessions by suspending one session and then switching
+to another control panel.  (Different control panel buffers are
+distinguished by a numerical suffix, e.g., @samp{Ediff Control Panel<3>}.)
+
address@hidden Selective Browsing, Highlighting Difference Regions, Window and 
Frame Configuration, Customization
address@hidden Selective Browsing
+
+Sometimes it is convenient to be able to step through only some difference
+regions, those that match certain regular expressions, and to ignore all
+others.  On other occasions, you may want to ignore difference regions that
+match some regular expressions, and to look only at the rest.
+
+The commands @kbd{#f} and @kbd{#h} let you do precisely this.
+
+Typing @kbd{#f} lets you specify regular expressions that match difference
+regions you want to focus on.
+We shall call these regular expressions @var{regexp-A}, @var{regexp-B} and
address@hidden
+Ediff will then start stepping through only those difference regions
+where the region in buffer A matches @var{regexp-A} and/or the region in
+buffer B matches @var{regexp-B}, etc.  Whether `and' or `or' will be used
+depends on how you respond to a question.
+
+When scanning difference regions for the aforesaid regular expressions,
+Ediff narrows the buffers to those regions.  This means that you can use
+the expressions @kbd{\`} and @kbd{\'} to tie search to the beginning or end
+of the difference regions.
+
+On the other hand, typing @kbd{#h} lets you specify (hide) uninteresting
+regions.  That is, if a difference region in buffer A matches
address@hidden, the corresponding region in buffer B matches @var{regexp-B}
+and (if applicable) buffer C's region matches @var{regexp-C}, then the
+region will be ignored by the commands @kbd{n}/@key{SPC}
+(@code{ediff-next-difference}) and @kbd{p}/@key{DEL}
+(@code{ediff-previous-difference}) commands.
+
+Typing @kbd{#f} and @kbd{#h} toggles selective browsing on and off.
+
+Note that selective browsing affects only @code{ediff-next-difference}
+and @code{ediff-previous-difference}, i.e., the commands
address@hidden/@key{SPC} and @kbd{p}/@key{DEL}.  @kbd{#f} and @kbd{#h} do not
+change the position of the point in the buffers.  And you can still jump
+directly (using @kbd{j})  to any numbered
+difference.
+
+Users can supply their own functions to specify how Ediff should do
+selective browsing.  To change the default Ediff function, add a function to
address@hidden which will do the following assignments:
+
address@hidden
+(setq ediff-hide-regexp-matches-function 'your-hide-function)
+(setq ediff-focus-on-regexp-matches-function 'your-focus-function)
address@hidden example
+
address@hidden hint}: To specify a regexp that matches everything, don't
+simply type @key{RET} in response to a prompt.  Typing @key{RET} tells Ediff
+to accept the default value, which may not be what you want.  Instead, you
+should enter something like @key{^} or @key{$}.  These match every
+line.
+
+You can use the status command, @kbd{i}, to find out whether
+selective browsing is currently in effect.
+
+The regular expressions you specified are kept in the local variables
address@hidden, @code{ediff-regexp-focus-B},
address@hidden, @code{ediff-regexp-hide-A},
address@hidden, @code{ediff-regexp-hide-C}.  Their default value
+is the empty string (i.e., nothing is hidden or focused on).  To change the
+default, set these variables in @file{.emacs} using @code{setq-default}.
+
+In addition to the ability to ignore regions that match regular
+expressions, Ediff can be ordered to start skipping over certain
+``uninteresting'' difference regions.  This is controlled by the following
+variable:
+
address@hidden @code
address@hidden ediff-ignore-similar-regions
address@hidden ediff-ignore-similar-regions
+If @code{t}, causes Ediff to skip over "uninteresting" difference regions,
+which are the regions where the variants differ only in the amount of the
+white space and newlines.  This feature can be toggled on/off interactively,
+via the command @kbd{##}.
address@hidden table
+
address@hidden note:} in order for this feature to work, auto-refining of
+difference regions must be on, since otherwise Ediff won't know if there
+are fine differences between regions.  On devices where Emacs can display
+faces, auto-refining is a default, but it is not turned on by default on
+text-only terminals.  In that case, you must explicitly turn auto-refining
+on (such as, by typing @kbd{@@}).
+
address@hidden:} If many such uninteresting regions appear in a row,
+Ediff may take a long time to skip over them because it has to compute fine
+differences of all intermediate regions.  This delay does not indicate any
+problem.
+
address@hidden ediff-ignore-case-option
address@hidden ediff-ignore-case-option3
address@hidden ediff-ignore-case
+Finally, Ediff can be told to ignore the case of the letters. This behavior
+can be toggled with @kbd{#c} and it is controlled with three variables:
address@hidden, @code{ediff-ignore-case-option3}, and
address@hidden
+
+The variable @code{ediff-ignore-case-option} specifies the option to pass
+to the diff program for comparing two files or buffers. For GNU
address@hidden, this option is @code{"-i"}. The variable
address@hidden specifies the option to pass to the
address@hidden program in order to make it case-insensitive. GNU @code{diff3}
+does not have such an option, so when merging or comparing three files with
+this program, ignoring the letter case is not supported.
+
+The variable @code{ediff-ignore-case} controls whether Ediff starts out by
+ignoring letter case or not. It can be set in @file{.emacs} using
address@hidden
+
+When case sensitivity is toggled, all difference
+regions are recomputed.
+
address@hidden Highlighting Difference Regions, Narrowing, Selective Browsing, 
Customization
address@hidden Highlighting Difference Regions
+
+The following variables control the way Ediff highlights difference
+regions:
+
address@hidden @code
address@hidden ediff-before-flag-bol
address@hidden ediff-after-flag-eol
address@hidden ediff-before-flag-mol
address@hidden ediff-after-flag-mol
address@hidden ediff-before-flag-bol
address@hidden ediff-after-flag-eol
address@hidden ediff-before-flag-mol
address@hidden ediff-after-flag-mol
+These variables hold strings that Ediff uses to mark the beginning and the
+end of the differences found in files A, B, and C on devices where Emacs
+cannot display faces.  Ediff uses different flags to highlight regions that
+begin/end at the beginning/end of a line or in a middle of a line.
+
address@hidden ediff-current-diff-face-A
address@hidden ediff-current-diff-face-B
address@hidden ediff-current-diff-face-C
address@hidden ediff-current-diff-face-A
address@hidden ediff-current-diff-face-B
address@hidden ediff-current-diff-face-C
+Ediff uses these faces to highlight current differences on devices where
+Emacs can display faces.  These and subsequently described faces can be set
+either in @file{.emacs} or in @file{.Xdefaults}.  The X resource for Ediff
+is @samp{Ediff}, @emph{not} @samp{emacs}.  Please refer to Emacs manual for
+the information on how to set X resources.
address@hidden ediff-fine-diff-face-A
address@hidden ediff-fine-diff-face-B
address@hidden ediff-fine-diff-face-C
address@hidden ediff-fine-diff-face-A
address@hidden ediff-fine-diff-face-B
address@hidden ediff-fine-diff-face-C
+Ediff uses these faces to show the fine differences between the current
+differences regions in buffers A, B, and C, respectively.
+
address@hidden ediff-even-diff-face-A
address@hidden ediff-even-diff-face-B
address@hidden ediff-even-diff-face-C
address@hidden ediff-odd-diff-face-A
address@hidden ediff-odd-diff-face-B
address@hidden ediff-odd-diff-face-C
address@hidden ediff-even-diff-face-A
address@hidden ediff-even-diff-face-B
address@hidden ediff-even-diff-face-C
address@hidden ediff-odd-diff-face-A
address@hidden ediff-odd-diff-face-B
address@hidden ediff-odd-diff-face-C
+Non-current difference regions are displayed using these alternating
+faces.  The odd and the even faces are actually identical on monochrome
+displays, because without colors options are limited.
+So, Ediff uses italics to highlight non-current differences.
+
address@hidden ediff-force-faces
address@hidden ediff-force-faces
+Ediff generally can detect when Emacs is running on a device where it can
+use highlighting with faces.  However, if it fails to determine that faces
+can be used, the user can set this variable to @code{t} to make sure that
+Ediff uses faces to highlight differences.
+
address@hidden ediff-highlight-all-diffs
address@hidden ediff-highlight-all-diffs
+Indicates whether---on a windowing display---Ediff should highlight
+differences using inserted strings (as on text-only terminals) or using
+colors and highlighting.  Normally, Ediff highlights all differences, but
+the selected difference is highlighted more visibly.  One can cycle through
+various modes of highlighting by typing @kbd{h}.  By default, Ediff starts
+in the mode where all difference regions are highlighted.  If you prefer to
+start in the mode where unselected differences are not highlighted, you
+should set @code{ediff-highlight-all-diffs} to @code{nil}.  Type @kbd{h} to
+restore highlighting for all differences.
+
+Ediff lets you switch between the two modes of highlighting.  That is,
+you can switch interactively from highlighting using faces to
+highlighting using string flags, and back.  Of course, switching has
+effect only under a windowing system.  On a text-only terminal or in an
+xterm window, the only available option is highlighting with strings.
address@hidden table
+
address@hidden
+If you want to change the default settings for @code{ediff-force-faces} and
address@hidden, you must do it @strong{before} Ediff is
+loaded.
+
+You can also change the defaults for the faces used to highlight the
+difference regions.  There are two ways to do this.  The simplest and the
+preferred way is to use the customization widget accessible from the
+menubar.  Ediff's customization group is located under "Tools", which in
+turn is under "Programming".  The faces that are used to highlight
+difference regions are located in the "Highlighting" subgroup of the Ediff
+customization group.
+
+The second, much more arcane, method to change default faces is to include
+some Lisp code in @file{~/.emacs}.  For instance,
+
address@hidden
+(setq ediff-current-diff-face-A
+      (copy-face 'bold-italic 'ediff-current-diff-face-A))
address@hidden example
+
address@hidden
+would use the pre-defined face @code{bold-italic} to highlight the current
+difference region in buffer A (this face is not a good choice, by the way).
+
+If you are unhappy with just @emph{some} of the aspects of the default
+faces, you can modify them when Ediff is being loaded using
address@hidden  For instance:
+
address@hidden
+(add-hook 'ediff-load-hook
+          (lambda ()
+            (set-face-foreground
+              ediff-current-diff-face-B "blue")
+            (set-face-background
+              ediff-current-diff-face-B "red")
+            (make-face-italic
+              ediff-current-diff-face-B)))
address@hidden smallexample
+
address@hidden note:} to set Ediff's faces, use only @code{copy-face}
+or @code{set/address@hidden as shown above. Emacs' low-level
+face-manipulation functions should be avoided.
+
address@hidden Narrowing, Refinement of Difference Regions, Highlighting 
Difference Regions, Customization
address@hidden Narrowing
+
+If buffers being compared are narrowed at the time of invocation of
+Ediff, @code{ediff-buffers} will preserve the narrowing range.  However,
+if @code{ediff-files} is invoked on the files visited by these buffers,
+that would widen the buffers, since this command is defined to compare the
+entire files.
+
+Calling @code{ediff-regions-linewise} or @code{ediff-windows-linewise}, or
+the corresponding @samp{-wordwise} commands, narrows the variants to the
+particular regions being compared.  The original accessible ranges are
+restored when you quit Ediff.  During the command, you can toggle this
+narrowing on and off with the @kbd{%} command.
+
+These two variables control this narrowing behavior:
+
address@hidden @code
address@hidden ediff-start-narrowed
address@hidden ediff-start-narrowed
+If @code{t}, Ediff narrows the display to the appropriate range when it
+is invoked with an @address@hidden or
address@hidden@dots{}} command.  If @code{nil}, these commands do
+not automatically narrow, but you can still toggle narrowing on and off
+by typing @kbd{%}.
+
address@hidden ediff-quit-widened
address@hidden ediff-quit-widened
+Controls whether on quitting Ediff should restore the accessible range
+that existed before the current invocation.
address@hidden table
+
address@hidden Refinement of Difference Regions, Patch and Diff Programs, 
Narrowing, Customization
address@hidden Refinement of Difference Regions
+
+Ediff has variables to control the way fine differences are
+highlighted.  This feature gives you control over the process of refinement.
+Note that refinement ignores spaces, tabs, and newlines.
+
address@hidden @code
address@hidden ediff-auto-refine
address@hidden ediff-auto-refine
+This variable controls whether fine differences within regions are
+highlighted automatically (``auto-refining'').  The default is yes
+(@samp{on}).
+
+On a slow machine, automatic refinement may be painful.  In that case,
+you can turn auto-refining on or off interactively by typing
address@hidden@@}.  You can also turn off display of refining that has
+already been done.
+
+When auto-refining is off, fine differences are shown only for regions
+for which these differences have been computed and saved before.  If
+auto-refining and display of refining are both turned off, fine
+differences are not shown at all.
+
+Typing @kbd{*} computes and displays fine differences for the current
+difference region, regardless of whether auto-refining is turned on.
+
address@hidden ediff-auto-refine-limit
address@hidden ediff-auto-refine-limit
+If auto-refining is on, this variable limits the size of the regions to
+be auto-refined.  This guards against the possible slowdown that may be
+caused by extraordinary large difference regions.
+
+You can always refine the current region by typing @kbd{*}.
+
address@hidden ediff-forward-word-function
address@hidden ediff-forward-word-function
+This variable controls how fine differences are computed.  The
+value must be a Lisp function that determines how the current difference
+region should be split into words.
+
address@hidden ediff-diff-program
address@hidden ediff-forward-word-function
address@hidden ediff-forward-word
+Fine differences are computed by first splitting the current difference
+region into words and then passing the result to
address@hidden  For the default forward word function (which is
address@hidden), a word is a string consisting of letters,
address@hidden, or @samp{_}; a string of punctuation symbols; a string of 
digits,
+or a string consisting of symbols that are neither space, nor a letter.
+
+This default behavior is controlled by four variables: @code{ediff-word-1},
+..., @code{ediff-word-4}.  See the on-line documentation for these variables
+and for the function @code{ediff-forward-word} for an explanation of how to
+modify these variables.
address@hidden ediff-word-1
address@hidden ediff-word-2
address@hidden ediff-word-3
address@hidden ediff-word-4
address@hidden table
+
+Sometimes, when a region has too many differences between the variants,
+highlighting of fine differences is inconvenient, especially on
+color displays.  If that is the case, type @kbd{*} with a negative
+prefix argument.  This unhighlights fine differences for the current
+region.
+
+To unhighlight fine differences in all difference regions, use the
+command @kbd{@@}.  Repeated typing of this key cycles through three
+different states: auto-refining, no-auto-refining, and no-highlighting
+of fine differences.
+
address@hidden Patch and Diff Programs, Merging and diff3, Refinement of 
Difference Regions, Customization
address@hidden Patch and Diff Programs
+
+This section describes variables that specify the programs to be used for
+applying patches and for computing the main difference regions (not the
+fine difference regions):
+
address@hidden @code
address@hidden ediff-diff-program
address@hidden ediff-diff3-program
address@hidden ediff-patch-program
address@hidden ediff-diff-program
address@hidden ediff-diff3-program
+These variables specify the programs to use to produce differences
+and do patching.
+
address@hidden ediff-diff-options
address@hidden ediff-diff3-options
address@hidden ediff-patch-options
address@hidden ediff-diff-options
address@hidden ediff-diff3-options
+These variables specify the options to pass to the above utilities.
+
+In @code{ediff-diff-options}, it may be useful to specify options
+such as @samp{-w} that ignore certain kinds of changes.  However,
+Ediff does not let you use the option @samp{-c}, as it doesn't recognize this
+format yet.
+
address@hidden ediff-coding-system-for-read
address@hidden ediff-coding-system-for-read
+This variable specifies the coding system to use when reading the output
+that the programs @code{diff3} and @code{diff} send to Emacs. The default
+is @code{raw-text}, and this should work fine in Unix and in most
+cases under Windows NT/95/98/2000. There are @code{diff} programs
+for which the default option doesn't work under Windows. In such cases,
address@hidden might work. If not, you will have to experiment with
+other coding systems or use GNU diff.
+
address@hidden ediff-patch-program
+The program to use to apply patches.  Since there are certain
+incompatibilities between the different versions of the patch program, the
+best way to stay out of trouble is to use a GNU-compatible version.
+Otherwise, you may have to tune the values of the variables
address@hidden, @code{ediff-backup-specs}, and
address@hidden as described below.
address@hidden ediff-patch-options
+Options to pass to @code{ediff-patch-program}.
+
+Note: the `-b' and `-z' options should be specified in
+`ediff-backup-specs', not in @code{ediff-patch-options}.
+
+It is recommended to pass the `-f' option to the patch program, so it won't
+ask questions.  However, some implementations don't accept this option, in
+which case the default value of this variable should be changed.
+
address@hidden ediff-backup-extension
+Backup extension used by the patch program.  Must be specified, even if
address@hidden is given.
address@hidden ediff-backup-specs
+Backup directives to pass to the patch program.
+Ediff requires that the old version of the file (before applying the patch)
+is saved in a file named @file{the-patch-file.extension}.  Usually
+`extension' is `.orig', but this can be changed by the user, and may also be
+system-dependent.  Therefore, Ediff needs to know the backup extension used
+by the patch program.
+
+Some versions of the patch program let the user specify `-b backup-extension'.
+Other versions only permit `-b', which (usually) assumes the extension `.orig'.
+Yet others force you to use `-z<backup-extension>'.
+
+Note that both `ediff-backup-extension' and `ediff-backup-specs' must be
+properly set.  If your patch program takes the option `-b', but not
+`-b extension', the variable `ediff-backup-extension' must still
+be set so Ediff will know which extension to use.
+
address@hidden ediff-custom-diff-program
address@hidden ediff-custom-diff-options
address@hidden ediff-custom-diff-program
address@hidden ediff-custom-diff-options
address@hidden ediff-save-buffer
+Because Ediff limits the options you may want to pass to the @code{diff}
+program, it partially makes up for this drawback by letting you save the
+output from @code{diff} in your preferred format, which is specified via
+the above two variables.
+
+The output generated by @code{ediff-custom-diff-program} (which doesn't
+even have to be a standard-style @code{diff}!)@: is not used by Ediff.  It is
+provided exclusively so that you can
+refer to
+it later, send it over email, etc.  For instance, after reviewing the
+differences, you may want to send context differences to a colleague.
+Since Ediff ignores the @samp{-c} option in
address@hidden, you would have to run @code{diff -c} separately
+just to produce the list of differences.  Fortunately,
address@hidden and @code{ediff-custom-diff-options}
+eliminate this nuisance by keeping a copy of a difference list in the
+desired format in a buffer that can be displayed via the command @kbd{D}.
+
address@hidden ediff-patch-default-directory
address@hidden ediff-patch-default-directory
+Specifies the default directory to look for patches.
+
address@hidden table
+
address@hidden
address@hidden:} Ediff does not support the output format of VMS
address@hidden  Instead, make sure you are using some implementation of POSIX
address@hidden, such as @code{gnudiff}.
+
address@hidden Merging and diff3, Support for Version Control, Patch and Diff 
Programs, Customization
address@hidden Merging and diff3
+
+Ediff supports three-way comparison via the functions @code{ediff-files3} and
address@hidden  The interface is the same as for two-way comparison.
+In three-way comparison and merging, Ediff reports if any two difference
+regions are identical.  For instance, if the current region in buffer A
+is the same as the region in buffer C, then the mode line of buffer A will
+display @samp{[=diff(C)]} and the mode line of buffer C will display
address@hidden(A)]}.
+
+Merging is done according to the following algorithm.
+
+If a difference region in one of the buffers, say B, differs from the ancestor
+file while the region in the other buffer, A, doesn't, then the merge buffer,
+C, gets B's region.  Similarly when buffer A's region differs from
+the ancestor and B's doesn't, A's region is used.
+
address@hidden ediff-default-variant
+If both regions in buffers A and B differ from the ancestor file, Ediff
+chooses the region according to the value of the variable
address@hidden  If its value is @code{default-A} then A's
+region is chosen.  If it is @code{default-B} then B's region is chosen.
+If it is @code{combined} then the region in buffer C will look like
+this:
+
address@hidden Use @set to avoid triggering merge conflict detectors like CVS.
address@hidden seven-left <<<<<<<
address@hidden seven-right >>>>>>>
address@hidden
address@hidden variant A
+the difference region from buffer A
address@hidden variant B
+the difference region from buffer B
+####### Ancestor
+the difference region from the ancestor buffer, if available
+======= end
address@hidden example
+
+The above is the default template for the combined region. The user can
+customize this template using the variable
address@hidden
+
address@hidden ediff-combination-pattern
+The variable @code{ediff-combination-pattern} specifies the template that
+determines how the combined merged region looks like.  The template is
+represented as a list of the form @code{(STRING1 Symbol1 STRING2 Symbol2
+STRING3 Symbol3 STRING4)}. The symbols here must be atoms of the form
address@hidden, @code{B}, or @code{Ancestor}. They determine the order in which
+the corresponding difference regions (from buffers A, B, and the ancestor
+buffer) are displayed in the merged region of buffer C.  The strings in the
+template determine the text that separates the aforesaid regions. The
+default template is
+
address@hidden
+("@value{seven-left} variant A" A "@value{seven-right} variant B" B
+   "####### Ancestor" Ancestor "======= end")
address@hidden smallexample
+
address@hidden
+(this is one long line) and the corresponding combined region is shown
+above. The order in which the regions are shown (and the separator
+strings) can be changed by changing the above template. It is even
+possible to add or delete region specifiers in this template (although
+the only possibly useful such modification seems to be the deletion of
+the ancestor).
+
+In addition to the state of the difference, Ediff displays the state of the
+merge for each region.  If a difference came from buffer A by default
+(because both regions A and B were different from the ancestor and
address@hidden was set to @code{default-A}) then
address@hidden(A) default-A]} is displayed in the mode line.  If the
+difference in buffer C came, say, from buffer B because the difference
+region in that buffer differs from the ancestor, but the region in buffer A
+does not (if merging with an ancestor) then @samp{[=diff(B) prefer-B]} is
+displayed.  The indicators default-A/B and prefer-A/B are inspired by
+Emerge and have the same meaning.
+
+Another indicator of the state of merge is @samp{combined}.  It appears
+with any difference region in buffer C that was obtained by combining
+the difference regions in buffers A and B as explained above.
+
+In addition to the state of merge and state of difference indicators, while
+merging with an ancestor file or buffer, Ediff informs the user when the
+current difference region in the (normally invisible) ancestor buffer is
+empty via the @emph{AncestorEmpty} indicator.  This helps determine if the
+changes made to the original in variants A and B represent pure insertion
+or deletion of text: if the mode line shows @emph{AncestorEmpty} and the
+corresponding region in buffers A or B is not empty, this means that new
+text was inserted.  If this indicator is not present and the difference
+regions in buffers A or B are non-empty, this means that text was
+modified.  Otherwise, the original text was deleted.
+
+Although the ancestor buffer is normally invisible, Ediff maintains
+difference regions there and advances the current difference region
+accordingly.  All highlighting of difference regions is provided in the
+ancestor buffer, except for the fine differences.  Therefore, if desired, the
+user can put the ancestor buffer in a separate frame and watch it
+there.  However, on a TTY, only one frame can be visible at any given time,
+and Ediff doesn't support any single-frame window configuration where all
+buffers, including the ancestor buffer, would be visible.  However, the
+ancestor buffer can be displayed by typing @kbd{/} to the control
+window.  (Type @kbd{C-l} to hide it again.)
+
+Note that the state-of-difference indicators @samp{=diff(A)} and
address@hidden(B)} above are not redundant, even in the presence of a
+state-of-merge indicator.  In fact, the two serve different purposes.
+
+For instance, if the mode line displays @samp{=diff(B) prefer(B)} and
+you copy a difference region from buffer A to buffer C then
address@hidden(B)} will change to @samp{diff-A} and the mode line will
+display @samp{=diff(A) prefer-B}.  This indicates that the difference
+region in buffer C is identical to that in buffer A, but originally
+buffer C's region came from buffer B.  This is useful to know because
+you can recover the original difference region in buffer C by typing
address@hidden
+
+
+Ediff never changes the state-of-merge indicator, except in response to
+the @kbd{!} command (see below), in which case the indicator is lost.
+On the other hand, the state-of-difference indicator is changed
+automatically by the copying/recovery commands, @kbd{a}, @kbd{b}, @kbd{r},
address@hidden
+
+The @kbd{!} command loses the information about origins of the regions
+in the merge buffer (default-A, prefer-B, or combined).  This is because
+recomputing differences in this case means running @code{diff3} on
+buffers A, B, and the merge buffer, not on the ancestor buffer.  (It
+makes no sense to recompute differences using the ancestor file, since
+in the merging mode Ediff assumes that you have not edited buffers A and
+B, but that you may have edited buffer C, and these changes are to be
+preserved.)  Since some difference regions may disappear as a result of
+editing buffer C and others may arise, there is generally no simple way
+to tell where the various regions in the merge buffer came from.
+
+In three-way comparison, Ediff tries to disregard regions that consist
+entirely of white space.  For instance, if, say, the current region in
+buffer A consists of the white space only (or if it is empty), Ediff will
+not take it into account for the purpose of computing fine differences.  The
+result is that Ediff can provide a better visual information regarding the
+actual fine differences in the non-white regions in buffers B and
+C.  Moreover, if the regions in buffers B and C differ in the white space
+only, then a message to this effect will be displayed.
+
address@hidden ediff-merge-window-share
+In the merge mode, the share of the split between window C (the window
+displaying the merge-buffer) and the windows displaying buffers A and B
+is controlled by the variable @code{ediff-merge-window-share}.  Its
+default value is 0.5.  To make the merge-buffer window smaller, reduce
+this amount.
+
+We don't recommend increasing the size of the merge-window to more than
+half the frame (i.e., to increase the value of
address@hidden) to more than 0.5, since it would be
+hard to see the contents of buffers A and B.
+
+You can temporarily shrink the merge window to just one line by
+typing @kbd{s}.  This change is temporary, until Ediff finds a reason to
+redraw the screen.  Typing @kbd{s} again restores the original window size.
+
+With a positive prefix argument, the @kbd{s} command will make the merge
+window slightly taller.  This change is persistent.  With address@hidden' or
+with a negative prefix argument, the command @kbd{s} makes the merge
+window slightly shorter.  This change also persistent.
+
address@hidden ediff-show-clashes-only
+Ediff lets you automatically ignore the regions where only one of the
+buffers A and B disagrees with the ancestor.  To do this, set the
+variable @code{ediff-show-clashes-only} to address@hidden
+
+You can toggle this feature interactively by typing @kbd{$$}.
+
+Note that this variable affects only the show next/previous difference
+commands.  You can still jump directly to any difference region directly
+using the command @kbd{j} (with a prefix argument specifying the difference
+number).
+
address@hidden ediff-autostore-merges
address@hidden ediff-quit-merge-hook
address@hidden ediff-maybe-save-and-delete-merge
+The variable @code{ediff-autostore-merges} controls what happens to the
+merge buffer when Ediff quits.  If the value is @code{nil}, nothing is done
+to the merge buffer---it will be the user's responsibility to save it.
+If the value is @code{t}, the user will be asked where to save the buffer
+and whether to delete it afterwards.  It the value is neither @code{nil} nor
address@hidden, the merge buffer is saved @emph{only} if this merge session was
+invoked from a group of related Ediff session, such as those that result
+from @code{ediff-merge-directories},
address@hidden, etc.
address@hidden Groups}.  This behavior is implemented in the function
address@hidden, which is a hook in
address@hidden  The user can supply a different hook, if
+necessary.
+
+The variable @code{ediff-autostore-merges} is buffer-local, so it can be
+set in a per-buffer manner.  Therefore, use @code{setq-default} to globally
+change this variable.
+
address@hidden ediff-merge-filename-prefix
+When merge buffers are saved automatically as directed by
address@hidden, Ediff attaches a prefix to each file, as
+specified by the variable @code{ediff-merge-filename-prefix}. The default
+is @code{merge_}, but this can be changed by the user.
+
address@hidden Support for Version Control, Customizing the Mode Line, Merging 
and diff3, Customization
address@hidden Support for Version Control
+
+
+Ediff supports version control and lets you compare versions of files
+visited by Emacs buffers via the function @code{ediff-revision}.  This
+feature is controlled by the following variables:
+
address@hidden @code
address@hidden ediff-version-control-package
address@hidden ediff-version-control-package
+A symbol.  The default is @samp{vc}.
+
+If you are like most Emacs users, Ediff will use VC as the version control
+package.  This is the standard Emacs interface to RCS, CVS, and SCCS.
+
+However, if your needs are better served by other interfaces, you will
+have to tell Ediff which version control package you are using, e.g.,
address@hidden
+(setq ediff-version-control-package 'rcs)
address@hidden example
+
+Apart from the standard @file{vc.el}, Ediff supports three other interfaces
+to version control: @file{rcs.el}, @file{pcl-cvs.el} (recently renamed
+pcvs.el), and @file{generic-sc.el}.  The package @file{rcs.el} is written
+by Sebastian Kremer <sk@@thp.Uni-Koeln.DE> and is available as
address@hidden
address@hidden:pub/Emacs/rcs.tar.Z}
address@hidden:/pub/gnu/emacs/rcs.tar.Z}
address@hidden example
address@hidden @file{vc.el}
address@hidden @file{rcs.el}
address@hidden @file{pcl-cvs.el}
address@hidden @file{generic-sc.el}
address@hidden table
+
+Ediff's interface to the above packages allows the user to compare the
+versions of the current buffer or to merge them (with or without an
+ancestor-version).  These operations can also be performed on directories
+containing files under version control.
+
+In case of @file{pcl-cvs.el}, Ediff can also be invoked via the function
address@hidden the documentation string for this
+function.
+
address@hidden Customizing the Mode Line, Miscellaneous, Support for Version 
Control, Customization
address@hidden Customizing the Mode Line
+
+When Ediff is running, the mode line of @samp{Ediff Control Panel}
+buffer shows the current difference number and the total number of
+difference regions in the two files.
+
+The mode line of the buffers being compared displays the type of the
+buffer (@samp{A:}, @samp{B:}, or @samp{C:}) and (usually) the file name.
+Ediff tries to be intelligent in choosing the mode line buffer
+identification.  In particular, it works well with the
address@hidden and @file{mode-line.el} packages (which improve on
+the default way in which Emacs displays buffer identification).  If you
+don't like the way Ediff changes the mode line, you can use
address@hidden to modify the mode line.
address@hidden ediff-prepare-buffer-hook
address@hidden @file{uniquify.el}
address@hidden @file{mode-line.el}
+
address@hidden Miscellaneous, Notes on Heavy-duty Customization, Customizing 
the Mode Line, Customization
address@hidden Miscellaneous
+
+Here are a few other variables for customizing Ediff:
+
address@hidden @code
address@hidden ediff-split-window-function
address@hidden ediff-split-window-function
+Controls the way you want the window be split between file-A and file-B
+(and file-C, if applicable).  It defaults to the vertical split
+(@code{split-window-vertically}, but you can set it to
address@hidden, if you so wish.
+Ediff also lets you switch from vertical to horizontal split and back
+interactively.
+
+Note that if Ediff detects that all the buffers it compares are displayed in
+separate frames, it assumes that the user wants them to be so displayed
+and stops splitting windows.  Instead, it arranges for each buffer to
+be displayed in a separate frame.  You can switch to the one-frame mode
+by hiding one of the buffers A/B/C.
+
+You can also swap the windows where buffers are displayed by typing
address@hidden
+
address@hidden ediff-merge-split-window-function
address@hidden ediff-merge-split-window-function
+Controls how windows are
+split between buffers A and B in the merge mode.
+This variable is like @code{ediff-split-window-function}, but it defaults
+to @code{split-window-horizontally} instead of
address@hidden
+
address@hidden ediff-make-wide-display-function
address@hidden ediff-make-wide-display-function
+The value is a function to be called to widen the frame for displaying
+the Ediff buffers.  See the on-line documentation for
address@hidden for details.  It is also
+recommended to look into the source of the default function
address@hidden
+
+You can toggle wide/regular display by typing @kbd{m}.  In the wide
+display mode, buffers A, B (and C, when applicable) are displayed in a
+single frame that is as wide as the entire workstation screen.  This is
+useful when files are compared side-by-side.  By default, the display is
+widened without changing its height.
+
address@hidden ediff-use-last-dir
address@hidden ediff-use-last-dir
+Controls the way Ediff presents the
+default directory when it prompts the user for files to compare.  If
address@hidden,
+Ediff uses the default directory of the current buffer when it
+prompts the user for file names.  Otherwise, it will use the
+directories it had previously used for files A, B, or C, respectively.
+
address@hidden ediff-no-emacs-help-in-control-buffer
address@hidden ediff-no-emacs-help-in-control-buffer
+If @code{t}, makes @kbd{C-h}
+behave like the @key{DEL} key, i.e., it will move you back to the previous
+difference rather than invoking help.  This is useful when, in an xterm
+window or a text-only terminal, the Backspace key is bound to @kbd{C-h} and is
+positioned more conveniently than the @key{DEL} key.
+
address@hidden ediff-toggle-read-only-function
address@hidden ediff-toggle-read-only-function
+This variable's value is a function that Ediff uses to toggle
+the read-only property in its buffers.
+
+The default function that Ediff uses simply toggles the read-only property,
+unless the file is under version control.  For a checked-in file under
+version control, Ediff first tries to check the file out.
+
address@hidden ediff-make-buffers-readonly-at-startup nil
address@hidden ediff-make-buffers-readonly-at-startup
+If @code{t}, all variant buffers are made read-only at Ediff startup.
+
address@hidden ediff-keep-variants
address@hidden @code{ediff-keep-variants}
+The default is @code{t}, meaning that the buffers being compared or merged will
+be preserved when Ediff quits.  Setting this to @code{nil} causes Ediff to
+offer the user a chance to delete these buffers (if they are not modified).
+Supplying a prefix argument to the quit command (@code{q}) temporarily
+reverses the meaning of this variable.  This is convenient when the user
+prefers one of the behaviors most of the time, but occasionally needs the
+other behavior.
+
+However, Ediff temporarily resets this variable to @code{t} if it is
+invoked via one of the "buffer" jobs, such as @code{ediff-buffers}.
+This is because it is all too easy to loose day's work otherwise.
+Besides, in a "buffer" job, the variant buffers have already been loaded
+prior to starting Ediff, so Ediff just preserves status quo here.
+
+Using @code{ediff-cleanup-hook}, one can make Ediff delete the variants
+unconditionally (e.g., by making @code{ediff-janitor} into one of these hooks).
+
address@hidden ediff-keep-tmp-versions
address@hidden @code{ediff-keep-tmp-versions}
+Default is @code{nil}. If @code{t}, the versions of the files being
+compared or merged using operations such as @code{ediff-revision} or
address@hidden are not deleted on exit. The normal action is
+to clean up and delete these version files.
+
address@hidden ediff-grab-mouse
address@hidden @code{ediff-grab-mouse}
+Default is @code{t}.  Normally, Ediff grabs mouse and puts it in its
+control frame.  This is useful since the user can be sure that when he
+needs to type an Ediff command the focus will be in an appropriate Ediff's
+frame.  However, some users prefer to move the mouse by themselves.  The
+above variable, if set to @code{maybe}, will prevent Ediff from grabbing
+the mouse in many situations, usually after commands that may take more
+time than usual.  In other situation, Ediff will continue grabbing the mouse
+and putting it where it believes is appropriate.  If the value is
address@hidden, then mouse is entirely user's responsibility.
+Try different settings and see which one is for you.
address@hidden table
+
+
address@hidden Notes on Heavy-duty Customization, , Miscellaneous, Customization
address@hidden Notes on Heavy-duty Customization
+
+Some users need to customize Ediff in rather sophisticated ways, which
+requires different defaults for different kinds of files (e.g., SGML,
+etc.).  Ediff supports this kind of customization in several ways.  First,
+most customization variables are buffer-local.  Those that aren't are
+usually accessible from within Ediff Control Panel, so one can make them
+local to the panel by calling make-local-variable from within
address@hidden
+
+Second, the function @code{ediff-setup} accepts an optional sixth
+argument which has the form @code{((@var{var-name-1} .@: @var{val-1})
+(@var{var-name-2} .@: @var{val-2}) @dots{})}.  The function
address@hidden sets the variables in the list to the respective
+values, locally in the Ediff control buffer.  This is an easy way to
+throw in custom variables (which usually should be buffer-local) that
+can then be tested in various hooks.
+
+Make sure the variable @code{ediff-job-name} and @code{ediff-word-mode} are set
+properly in this case, as some things in Ediff depend on this.
+
+Finally, if you want custom-tailored help messages, you can set the
+variables @code{ediff-brief-help-message-function} and
address@hidden
+to functions that return help strings.
address@hidden ediff-startup-hook
address@hidden ediff-setup
address@hidden ediff-job-name
address@hidden ediff-word-mode
address@hidden ediff-brief-help-message-function
address@hidden ediff-long-help-message-function
+
+When customizing Ediff, some other variables are useful, although they are
+not user-definable.  They are local to the Ediff control buffer, so this
+buffer must be current when you access these variables.  The control buffer
+is accessible via the variable @code{ediff-control-buffer}, which is also
+local to that buffer.  It is usually used for checking if the current buffer
+is also the control buffer.
+
+Other variables of interest are:
address@hidden @code
address@hidden ediff-buffer-A
+The first of the data buffers being compared.
+
address@hidden ediff-buffer-B
+The second of the data buffers being compared.
+
address@hidden ediff-buffer-C
+In three-way comparisons, this is the third buffer being compared.
+In merging, this is the merge buffer.
+In two-way comparison, this variable is @code{nil}.
+
address@hidden ediff-window-A
+The window displaying buffer A.  If buffer A is not visible, this variable
+is @code{nil} or it may be a dead window.
+
address@hidden ediff-window-B
+The window displaying buffer B.
+
address@hidden ediff-window-C
+The window displaying buffer C, if any.
+
address@hidden ediff-control-frame
+A dedicated frame displaying the control buffer, if it exists.  It is
address@hidden only if Ediff uses the multiframe display, i.e., when
+the control buffer is in its own frame.
address@hidden table
+
address@hidden Credits, GNU Free Documentation License, Customization, Top
address@hidden Credits
+
+Ediff was written by Michael Kifer <kifer@@cs.stonybrook.edu>.  It was inspired
+by emerge.el written by Dale R.@: Worley <drw@@math.mit.edu>.  An idea due to
+Boris Goldowsky <boris@@cs.rochester.edu> made it possible to highlight
+fine differences in Ediff buffers.  Alastair Burt <burt@@dfki.uni-kl.de>
+ported Ediff to XEmacs, Eric Freudenthal <freudent@@jan.ultra.nyu.edu>
+made it work with VC, Marc Paquette <marcpa@@cam.org> wrote the
+toolbar support package for Ediff, and Hrvoje Niksic <hniksic@@xemacs.org>
+adapted it to the Emacs customization package.
+
+Many people provided help with bug reports, feature suggestions, and advice.
+Without them, Ediff would not be nearly as useful as it is today.
+Here is a hopefully full list of contributors:
+
address@hidden
+Adrian Aichner (aichner@@ecf.teradyne.com),
+Drew Adams (drew.adams@@oracle.com),
+Steve Baur (steve@@xemacs.org),
+Neal Becker (neal@@ctd.comsat.com),
+E.@: Jay Berkenbilt (ejb@@ql.org),
+Alastair Burt (burt@@dfki.uni-kl.de),
+Paul Bibilo (peb@@delcam.co.uk),
+Kevin Broadey (KevinB@@bartley.demon.co.uk),
+Harald Boegeholz (hwb@@machnix.mathematik.uni-stuttgart.de),
+Bradley A.@: Bosch (brad@@lachman.com),
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