This is evil.info, produced by makeinfo version 6.5 from evil.texi.
This manual is for Evil (version 0.1 of 2011-07-30), an extensible vi
layer for Emacs.
Copyright © 2011 Frank Fischer and Vegard Øye.
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.3 or any later version published by the Free Software
Foundation; with no Invariant Sections, no Front-Cover Texts, and
no Back-Cover Texts. A copy of the license is included in the
section entitled "GNU Free Documentation License".
The Evil team thanks everyone at gmane.emacs.vim-emulation for their
feedback and contributions.
INFO-DIR-SECTION Emacs
START-INFO-DIR-ENTRY
* Evil: (evil). Extensible vi layer for Emacs.
END-INFO-DIR-ENTRY
File: evil.info, Node: Top, Next: Overview, Prev: (dir), Up: (dir)
Evil
****
This is the manual for Evil, an extensible vi layer for Emacs.
* Menu:
* Overview::
* Settings::
* Keymaps::
* Hooks::
* Macros::
* Other internals::
* GNU Free Documentation License::
File: evil.info, Node: Overview, Next: Settings, Up: Top
1 Overview
**********
Evil is an extensible vi layer for Emacs. It emulates the main features
of Vim,(1) turning Emacs into a modal editor. Like Emacs in general,
Evil is extensible in Emacs Lisp.
* Menu:
* Installation::
* Modes and states::
---------- Footnotes ----------
(1) Vim is the most popular version of "vi", a modal text editor with
many implementations. Vim also adds some functions of its own, like
Visual selection and text objects. For more information, see:
File: evil.info, Node: Installation, Next: Modes and states, Up: Overview
1.1 Installation
================
Evil lives in a Git repository. To download Evil, do:
git clone https://github.com/emacs-evil/evil.git
Move Evil to '~/.emacs.d/evil'. Then add the following lines to
'~/.emacs':
(add-to-list 'load-path "~/.emacs.d/evil")
(require 'evil)
(evil-mode 1)
Evil requires 'undo-tree.el' to provide linear undo and undo branches.
It is available from EmacsWiki.(1) (A copy of 'undo-tree.el' is also
included in the Git repository.)
---------- Footnotes ----------
(1)
File: evil.info, Node: Modes and states, Prev: Installation, Up: Overview
1.2 Modes and states
====================
The next time Emacs is started, it will come up in "Normal state",
denoted by '' on the mode line. This is where the main vi bindings
are defined. Note that you can always disable Normal state with 'C-z',
which switches to an "Emacs state" (denoted by '') in which vi keys
are completely disabled. Press 'C-z' again to switch back to Normal
state.
Evil uses the term "state" for what is called a "mode" in vi, since
"mode" already has its own meaning in Emacs. Evil defines a number of
states, such as Normal state (''), Insert state (''), Visual state
(''), Replace state (''), Operator-Pending state (''), Motion
state ('') and Emacs state (''). Each state has its own keymaps
and customization variables.
Meanwhile, a "mode" in Emacs is a set of key bindings for editing a
certain sort of text, like 'emacs-lisp-mode' for Emacs Lisp. Modes may
include custom bindings for Evil states.
File: evil.info, Node: Settings, Next: Keymaps, Prev: Overview, Up: Top
2 Settings
**********
Evil's behavior can be adjusted by setting various variables. The
current values may be inspected by doing 'M-x customize-group RET evil
RET'.
To change the value of a variable, add a 'setq' form to '~/.emacs',
preferably before Evil is loaded:(1)
(setq evil-shift-width 8)
;; Load Evil
(require 'evil) ...
Note that if a variable is buffer-local, you must use 'setq-default'
instead of 'setq' to change its global value.
-- Variable: evil-auto-indent
Whether the current line is indented when entering Insert state.
If 't' (the default), then the line is indented. If 'nil', then
the line is not indented. Buffer-local.
-- Variable: evil-shift-width
The number of columns a line is shifted by the commands '>' and
'<'.
-- Variable: evil-repeat-move-cursor
If 't' (the default), then repeating a command with '.' may change
the position of the cursor. If 'nil', then the original position
is preserved.
-- Variable: evil-find-skip-newlines
If 't', then 'f', 'F', 't' and 'T' may skip over newlines to find a
character. If 'nil' (the default), then they are restricted to the
current line.
-- Variable: evil-move-cursor-back
If 't' (the default), then the cursor moves backwards when exiting
Insert state. If 'nil', then the cursor does not move.
-- Variable: evil-want-fine-undo
If 't', then a change-based action like 'cw' may be undone in
several steps. If 'nil' (the default), then it is undone in one
step.
-- Variable: evil-regexp-search
If 't' (the default), then '/' and '?' use regular expressions for
searching. If 'nil', they use plain text.
-- Variable: evil-search-wrap
If 't' (the default), then '/' and '?' wrap the search around the
buffer. If 'nil', then they stop at buffer boundaries.
-- Variable: evil-flash-delay
The number of seconds to flash search matches when pressing 'n' and
'N'.
-- Variable: evil-want-C-i-jump
If 't' (the default), then 'C-i' jumps forwards in the jump list.
If 'nil', then 'C-i' inserts a tab.
-- Variable: evil-want-C-u-scroll
If 't', then 'C-u' scrolls the buffer. If 'nil' (the default),
then 'C-u' begins a numeric prefix argument.
* Menu:
* The cursor::
* The initial state::
---------- Footnotes ----------
(1) Strictly speaking, the order only matters if the variable affects
the way Evil is loaded. This is the case with some of the 'evil-want-'
variables.
File: evil.info, Node: The cursor, Next: The initial state, Up: Settings
2.1 The cursor
==============
A state may change the cursor's appearance. The cursor settings are
stored in the variables below, which may contain a cursor type as per
the 'cursor-type' variable, a color string as passed to the
'set-cursor-color' function, a zero-argument function for changing the
cursor, or a list of the above. For example, the following changes the
cursor in Replace state to a red box:
(setq evil-replace-state-cursor '("red" box))
If the state does not specify a cursor, 'evil-default-cursor' is used.
-- Variable: evil-default-cursor
The default cursor.
-- Variable: evil-normal-state-cursor
The cursor for Normal state.
-- Variable: evil-insert-state-cursor
The cursor for Insert state.
-- Variable: evil-visual-state-cursor
The cursor for Visual state.
-- Variable: evil-replace-state-cursor
The cursor for Replace state.
-- Variable: evil-operator-state-cursor
The cursor for Operator-Pending state.
-- Variable: evil-motion-state-cursor
The cursor for Motion state.
-- Variable: evil-emacs-state-cursor
The cursor for Emacs state.
File: evil.info, Node: The initial state, Prev: The cursor, Up: Settings
2.2 The initial state
=====================
By default, a new buffer comes up in Normal state. This can be changed
with the function 'evil-set-initial-state'.
-- Function: evil-set-initial-state mode state
Set the initial state for a buffer in which MODE is active to
STATE. MODE should be a major mode such as 'text-mode', although
minor modes work as well.
File: evil.info, Node: Keymaps, Next: Hooks, Prev: Settings, Up: Top
3 Keymaps
*********
Evil's key bindings are stored in a number of keymaps. Each state has a
"global keymap", where the default key bindings for the state are
stored. For example, the global keymap for Normal state is
'evil-normal-state-map', and the key bindings in this map are seen in
all buffers that are currently in Normal state.
Keymaps are modified with the Emacs function 'define-key':
(define-key evil-normal-state-map "w" 'foo)
This binds the key 'w' to the command 'foo' in Normal state. The file
'evil-maps.el' contains all the key bindings.
-- Variable: evil-normal-state-map
The global keymap for Normal state.
-- Variable: evil-insert-state-map
The global keymap for Insert state.
-- Variable: evil-visual-state-map
The global keymap for Visual state.
-- Variable: evil-replace-state-map
The global keymap for Replace state.
-- Variable: evil-operator-state-map
The global keymap for Operator-Pending state.
-- Variable: evil-motion-state-map
The global keymap for Motion state.
Each state also has a "buffer-local keymap", which is specific to the
current buffer and has precedence over the global keymap. These maps
may be changed from a mode hook.
-- Variable: evil-normal-state-local-map
Buffer-local keymap for Normal state.
-- Variable: evil-insert-state-local-map
Buffer-local keymap for Insert state.
-- Variable: evil-visual-state-local-map
Buffer-local keymap for Visual state.
-- Variable: evil-replace-state-local-map
Buffer-local keymap for Replace state.
-- Variable: evil-operator-state-local-map
Buffer-local keymap for Operator-Pending state.
-- Variable: evil-motion-state-local-map
Buffer-local keymap for Motion state.
* Menu:
* evil-define-key::
File: evil.info, Node: evil-define-key, Up: Keymaps
3.1 'evil-define-key'
=====================
Finally, Evil provides the function 'evil-define-key' for adding state
bindings to a regular keymap.
-- Function: evil-define-key state keymap key def
In KEYMAP, create a binding from KEY to DEF in STATE. STATE is one
of 'normal', 'insert', 'visual', 'replace', 'operator' and
'motion'. The other parameters are like those of 'define-key'.
'evil-define-key' can be used to augment existing modes with state
bindings, as well as create packages for custom bindings. For example,
the following will create a minor mode 'foo-mode' with Normal state
bindings for the keys 'w' and 'e':
(define-minor-mode foo-mode
"Foo mode."
:keymap (make-sparse-keymap))
(evil-define-key 'normal foo-mode-map "w" 'bar)
(evil-define-key 'normal foo-mode-map "e" 'baz)
This minor mode can then be enabled in any buffers where the custom
bindings are desired:
(add-hook 'text-mode-hook 'foo-mode) ; enable alongside 'text-mode'
If the minor mode is put into its own file 'foo.el' with a '(provide
'foo)' statement, it becomes an Emacs package.
File: evil.info, Node: Hooks, Next: Macros, Prev: Keymaps, Up: Top
4 Hooks
*******
A "hook" is a list of functions to execute. Hooks are modified with the
Emacs function 'add-hook'. Evil provides entry and exit hooks for all
of its states.
-- Variable: evil-normal-state-entry-hook
Run when entering Normal state.
-- Variable: evil-normal-state-exit-hook
Run when exiting Normal state.
-- Variable: evil-insert-state-entry-hook
Run when entering Insert state.
-- Variable: evil-insert-state-exit-hook
Run when exiting Insert state.
-- Variable: evil-visual-state-entry-hook
Run when entering Visual state.
-- Variable: evil-visual-state-exit-hook
Run when exiting Visual state.
-- Variable: evil-replace-state-entry-hook
Run when entering Replace state.
-- Variable: evil-replace-state-exit-hook
Run when exiting Replace state.
-- Variable: evil-operator-state-entry-hook
Run when entering Operator-Pending state.
-- Variable: evil-operator-state-exit-hook
Run when exiting Operator-Pending state.
-- Variable: evil-motion-state-entry-hook
Run when entering Motion state.
-- Variable: evil-motion-state-exit-hook
Run when exiting Motion state.
When these hooks are run, the variables 'evil-next-state' and
'evil-previous-state' hold information about the states being switched
to and from.
-- Variable: evil-next-state
The state being switched to.
-- Variable: evil-previous-state
The state being switched from.
File: evil.info, Node: Macros, Next: Other internals, Prev: Hooks, Up: Top
5 Macros
********
Evil is implemented in terms of reusable macros. Package writers can
use these to define new commands.
* Menu:
* Motions::
* Operators::
* Text objects::
* Types::
* States::
File: evil.info, Node: Motions, Next: Operators, Up: Macros
5.1 Motions
===========
A "motion" is a command which moves the cursor, such as 'w' and 'e'.
Motions are defined with the macro 'evil-define-motion'. Motions not
defined in this way should be declared with 'evil-declare-motion'.
-- Function: evil-declare-motion command
Declare COMMAND to be a motion. This ensures that it works
properly in Visual state.
-- Macro: evil-define-motion motion (count args...) doc keyword-args...
body...
Define a movement command MOTION. A motion can have any number of
arguments, but the first argument, if any, has a predefined meaning
as the COUNT. It is a positive or negative number, or 'nil'. The
argument list is followed by the documentation string DOC, which is
followed by optional keyword arguments:
':type TYPE'
The TYPE determines how the motion works after an operator.
If TYPE is 'inclusive', then the ending position is included
in the motion range. If TYPE is 'line', then the range is
expanded to linewise positions. If TYPE is 'block', then the
range is blockwise. The default is 'exclusive', which means
that the range is used as-is.
':jump JUMP'
If JUMP is 't', then the previous position is stored in the
jump list so it can be restored with 'C-o'. The default is
'nil'.
The keyword arguments are followed by the BODY, which is where the
motion's behavior is defined. For instance:
(evil-define-motion foo-forward (count)
"Move to the right by COUNT characters."
:type inclusive
(forward-char (or count 1)))
For more examples, you can view the source code for any command
with 'C-h k'. For instance, 'evil-goto-line' may be viewed by
typing 'C-h k G' and following the file link.
File: evil.info, Node: Operators, Next: Text objects, Prev: Motions, Up: Macros
5.2 Operators
=============
An "operator" is a command which acts on the text moved over by a
motion, such as 'c', 'd' and 'y'. Operators are defined with the macro
'evil-define-operator'.
-- Macro: evil-define-operator operator (beg end type args...) doc
keyword-args... body...
Define an operator command OPERATOR. An operator must have at
least two or three arguments, which have predefined meanings. BEG
is the beginning position, END is the ending position, and TYPE, if
given, is the type of the motion range. The argument list is
followed by the documentation string DOC, which is followed by
optional keyword arguments:
':type TYPE'
Make the input range be a certain TYPE. For example, an
operator which only works with whole lines may set TYPE to
'line'.
':motion MOTION'
Use the motion MOTION instead of reading one from the
keyboard. This does not affect the behavior in Visual state,
where the selection boundaries are used instead.
':repeat REPEAT'
If REPEAT is 't' (the default), then '.' will repeat the
operator. If REPEAT is 'nil', then the operator will not be
repeated.
':move-point MOVE-POINT'
If MOVE-POINT is 't' (the default), then the cursor is
positioned at the beginning of the range. If MOVE-POINT is
'nil', then the original position is preserved.
':keep-visual KEEP-VISUAL'
If KEEP-VISUAL is 't', then the selection is not disabled when
the operator is run in Visual state; it is up to the operator
to do this. The default is 'nil', which means that Visual
state is exited automatically.
The keyword arguments are followed by the BODY, which is where the
operator's actions on BEG and END are defined. For example,
'evil-rot13', which is bound to 'g?' and performs ROT13 encryption
on the text, may be defined as:
(evil-define-operator evil-rot13 (beg end)
"ROT13 encrypt text."
(rot13-region beg end))
Pressing 'g?w' will encrypt a word by calling 'rot13-region' on the
text moved over by the 'w' motion.
File: evil.info, Node: Text objects, Next: Types, Prev: Operators, Up: Macros
5.3 Text objects
================
A "text object" is a special kind of motion which sets a beginning
position as well as an ending position, such as 'iw' and 'a('. In
Visual state, text objects alter both ends of the selection. Text
objects are defined with the macro 'evil-define-text-object'.
-- Macro: evil-define-text-object object (count args...) doc
keyword-args... body...
Define a text object OBJECT. The first argument has a predefined
meaning as the COUNT: it is a positive or negative number. The
argument list is followed by the documentation string DOC, which is
followed by optional keyword arguments:
':type TYPE'
Use the type TYPE after an operator. In Visual state, this is
the type of the selection.
':extend-selection EXTEND-SELECTION'
If EXTEND-SELECTION is 't' (the default), then the text object
always enlarges the current selection. If 'nil', then the
object replaces the selection.
The keyword arguments are followed by the BODY, which should
evaluate to a list '(BEG END)' of two positions in the buffer. For
example, a text object which selects three characters following the
current position could be defined as:
(evil-define-text-object foo (count)
"Select three characters."
(list (point) (+ (point) 3)))
Evil provides several functions which return a list of positions, for
use in the definition of a text object. These functions follow the rule
that a positive COUNT selects text after the current position, while a
negative COUNT selects text before it.
-- Function: evil-inner-object-range count forward backward
Return a text range '(BEG END)' of COUNT "inner" text objects
(e.g., 'iw', 'is'). FORWARD is a function which moves to the end
of an object, and BACKWARD is a function which moves to the
beginning.
-- Function: evil-an-object-range count forward backward
Return a text range '(BEG END)' of COUNT text objects with
whitespace (e.g., 'aw', 'as'). FORWARD is a function which moves
to the end of an object, and BACKWARD is a function which moves to
the beginning.
-- Function: evil-paren-range count open close &optional exclusive
Return a text range '(BEG END)' of COUNT delimited blocks (e.g.,
'i(', 'a('). OPEN and CLOSE are characters. If EXCLUSIVE is
non-nil, then the delimiters are excluded from the range. This
function uses Emacs' syntax table and is only applicable for
single-character delimiters; use 'evil-regexp-range' to match
multiple characters.
-- Function: evil-regexp-range count open close &optional exclusive
Return a text range '(BEG END)' of COUNT delimited blocks (e.g.,
'it', 'at'). OPEN and CLOSE are regular expressions. If EXCLUSIVE
is non-nil, then the delimiters are excluded from the range.
File: evil.info, Node: Types, Next: States, Prev: Text objects, Up: Macros
5.4 Types
=========
A "type" is a transformation on a pair of buffer positions. Evil
defines the types 'exclusive', 'inclusive', 'line' and 'block', which
are used for motion ranges and Visual selection. Types are defined with
the macro 'evil-define-type'.
-- Macro: evil-define-type type doc keyword-args...
Define a type TYPE, described by the documentation string DOC.
Then follows keyword arguments:
':expand EXPAND'
A function which takes two buffer positions and returns a list
'(BEG END)' of expanded positions.
':contract CONTRACT'
A function which takes two expanded buffer positions and
returns a list '(BEG END)' of unexpanded positions. Optional.
':normalize NORMALIZE'
A function which takes two unexpanded buffer positions and
returns a list '(BEG END)' of adjusted positions. Optional.
':injective INJECTIVE'
If 't' (the default), then expansion is one-to-one - i.e.,
EXPAND followed by CONTRACT always returns the original
positions. If 'nil', then several positions may expand to the
same (for example, the 'line' type is one-to-many as it
expands to the containing lines).
Further keywords and functions may be specified. These are
understood to be transformations on buffer positions, like EXPAND
and CONTRACT.
File: evil.info, Node: States, Prev: Types, Up: Macros
5.5 States
==========
States are defined with the macro 'evil-define-state'. The macro
defines the necessary hooks, keymaps and variables for a state, as well
as a toggle function 'evil-STATE-state' for entering the state, and a
predicate function 'evil-STATE-state-p' which returns 't' when the state
is active, and 'nil' otherwise.
-- Macro: evil-define-state state doc keyword-args... body...
Define an Evil state STATE, described by the documentation string
DOC. Then follows optional keyword arguments:
':tag TAG'
Mode line indicitor, e.g., '""'.
':message MESSAGE'
String shown in the echo area.
':cursor CURSOR'
Cursor specification.
':enable ENABLE'
List of other modes and states to enable. A state may enable
another state's keymaps in addition to its own.
This is followed the BODY, which is executed whenever the state is
enabled or disabled. The state's predicate function may be used to
distinguish between the two.
File: evil.info, Node: Other internals, Next: GNU Free Documentation License, Prev: Macros, Up: Top
6 Other internals
*****************
* Menu:
* Command properties::
File: evil.info, Node: Command properties, Up: Other internals
6.1 Command properties
======================
Evil defines "command properties" to store information about commands,
such as whether they should be repeated. A command property is a
':KEYWORD' with an associated value, e.g., ':repeat nil'.
-- Function: evil-add-command-properties command &rest properties
Add PROPERTIES to COMMAND. The properties should be specified as a
list of keywords and values:
(evil-add-command-properties 'my-command :repeat t)
-- Function: evil-set-command-properties command &rest properties
Like 'evil-add-command-properties', but resets all previous
properties.
-- Function: evil-get-command-property command property
Return the value of a command property.
-- Macro: evil-define-command command (args...) doc keyword-args...
body...
Define a command with command properties KEYWORD-ARGS.
For setting repeat properties, Evil provides the following functions:
-- Function: evil-declare-repeat command
Declare COMMAND to be repeatable.
-- Function: evil-declare-not-repeat command
Declare COMMAND to be nonrepeatable.
-- Function: evil-declare-change-repeat command
Declare COMMAND to be repeatable by buffer changes rather than
keystrokes.
File: evil.info, Node: GNU Free Documentation License, Prev: Other internals, Up: Top
Appendix A GNU Free Documentation License
*****************************************
Version 1.3, 3 November 2008
Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
0. PREAMBLE
The purpose of this License is to make a manual, textbook, or other
functional and useful document "free" in the sense of freedom: to
assure everyone the effective freedom to copy and redistribute it,
with or without modifying it, either commercially or
noncommercially. Secondarily, this License preserves for the
author and publisher a way to get credit for their work, while not
being considered responsible for modifications made by others.
This License is a kind of "copyleft", which means that derivative
works of the document must themselves be free in the same sense.
It complements the GNU General Public License, which is a copyleft
license designed for free software.
We have designed this License in order to use it for manuals for
free software, because free software needs free documentation: a
free program should come with manuals providing the same freedoms
that the software does. But this License is not limited to
software manuals; it can be used for any textual work, regardless
of subject matter or whether it is published as a printed book. We
recommend this License principally for works whose purpose is
instruction or reference.
1. APPLICABILITY AND DEFINITIONS
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A "Modified Version" of the Document means any work containing the
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A "Secondary Section" is a named appendix or a front-matter section
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2. VERBATIM COPYING
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or further copying of the copies you make or distribute. However,
you may accept compensation in exchange for copies. If you
distribute a large enough number of copies you must also follow the
conditions in section 3.
You may also lend copies, under the same conditions stated above,
and you may publicly display copies.
3. COPYING IN QUANTITY
If you publish printed copies (or copies in media that commonly
have printed covers) of the Document, numbering more than 100, and
the Document's license notice requires Cover Texts, you must
enclose the copies in covers that carry, clearly and legibly, all
these Cover Texts: Front-Cover Texts on the front cover, and
Back-Cover Texts on the back cover. Both covers must also clearly
and legibly identify you as the publisher of these copies. The
front cover must present the full title with all words of the title
equally prominent and visible. You may add other material on the
covers in addition. Copying with changes limited to the covers, as
long as they preserve the title of the Document and satisfy these
conditions, can be treated as verbatim copying in other respects.
If the required texts for either cover are too voluminous to fit
legibly, you should put the first ones listed (as many as fit
reasonably) on the actual cover, and continue the rest onto
adjacent pages.
If you publish or distribute Opaque copies of the Document
numbering more than 100, you must either include a machine-readable
Transparent copy along with each Opaque copy, or state in or with
each Opaque copy a computer-network location from which the general
network-using public has access to download using public-standard
network protocols a complete Transparent copy of the Document, free
of added material. If you use the latter option, you must take
reasonably prudent steps, when you begin distribution of Opaque
copies in quantity, to ensure that this Transparent copy will
remain thus accessible at the stated location until at least one
year after the last time you distribute an Opaque copy (directly or
through your agents or retailers) of that edition to the public.
It is requested, but not required, that you contact the authors of
the Document well before redistributing any large number of copies,
to give them a chance to provide you with an updated version of the
Document.
4. MODIFICATIONS
You may copy and distribute a Modified Version of the Document
under the conditions of sections 2 and 3 above, provided that you
release the Modified Version under precisely this License, with the
Modified Version filling the role of the Document, thus licensing
distribution and modification of the Modified Version to whoever
possesses a copy of it. In addition, you must do these things in
the Modified Version:
A. Use in the Title Page (and on the covers, if any) a title
distinct from that of the Document, and from those of previous
versions (which should, if there were any, be listed in the
History section of the Document). You may use the same title
as a previous version if the original publisher of that
version gives permission.
B. List on the Title Page, as authors, one or more persons or
entities responsible for authorship of the modifications in
the Modified Version, together with at least five of the
principal authors of the Document (all of its principal
authors, if it has fewer than five), unless they release you
from this requirement.
C. State on the Title page the name of the publisher of the
Modified Version, as the publisher.
D. Preserve all the copyright notices of the Document.
E. Add an appropriate copyright notice for your modifications
adjacent to the other copyright notices.
F. Include, immediately after the copyright notices, a license
notice giving the public permission to use the Modified
Version under the terms of this License, in the form shown in
the Addendum below.
G. Preserve in that license notice the full lists of Invariant
Sections and required Cover Texts given in the Document's
license notice.
H. Include an unaltered copy of this License.
I. Preserve the section Entitled "History", Preserve its Title,
and add to it an item stating at least the title, year, new
authors, and publisher of the Modified Version as given on the
Title Page. If there is no section Entitled "History" in the
Document, create one stating the title, year, authors, and
publisher of the Document as given on its Title Page, then add
an item describing the Modified Version as stated in the
previous sentence.
J. Preserve the network location, if any, given in the Document
for public access to a Transparent copy of the Document, and
likewise the network locations given in the Document for
previous versions it was based on. These may be placed in the
"History" section. You may omit a network location for a work
that was published at least four years before the Document
itself, or if the original publisher of the version it refers
to gives permission.
K. For any section Entitled "Acknowledgements" or "Dedications",
Preserve the Title of the section, and preserve in the section
all the substance and tone of each of the contributor
acknowledgements and/or dedications given therein.
L. Preserve all the Invariant Sections of the Document, unaltered
in their text and in their titles. Section numbers or the
equivalent are not considered part of the section titles.
M. Delete any section Entitled "Endorsements". Such a section
may not be included in the Modified Version.
N. Do not retitle any existing section to be Entitled
"Endorsements" or to conflict in title with any Invariant
Section.
O. Preserve any Warranty Disclaimers.
If the Modified Version includes new front-matter sections or
appendices that qualify as Secondary Sections and contain no
material copied from the Document, you may at your option designate
some or all of these sections as invariant. To do this, add their
titles to the list of Invariant Sections in the Modified Version's
license notice. These titles must be distinct from any other
section titles.
You may add a section Entitled "Endorsements", provided it contains
nothing but endorsements of your Modified Version by various
parties--for example, statements of peer review or that the text
has been approved by an organization as the authoritative
definition of a standard.
You may add a passage of up to five words as a Front-Cover Text,
and a passage of up to 25 words as a Back-Cover Text, to the end of
the list of Cover Texts in the Modified Version. Only one passage
of Front-Cover Text and one of Back-Cover Text may be added by (or
through arrangements made by) any one entity. If the Document
already includes a cover text for the same cover, previously added
by you or by arrangement made by the same entity you are acting on
behalf of, you may not add another; but you may replace the old
one, on explicit permission from the previous publisher that added
the old one.
The author(s) and publisher(s) of the Document do not by this
License give permission to use their names for publicity for or to
assert or imply endorsement of any Modified Version.
5. COMBINING DOCUMENTS
You may combine the Document with other documents released under
this License, under the terms defined in section 4 above for
modified versions, provided that you include in the combination all
of the Invariant Sections of all of the original documents,
unmodified, and list them all as Invariant Sections of your
combined work in its license notice, and that you preserve all
their Warranty Disclaimers.
The combined work need only contain one copy of this License, and
multiple identical Invariant Sections may be replaced with a single
copy. If there are multiple Invariant Sections with the same name
but different contents, make the title of each such section unique
by adding at the end of it, in parentheses, the name of the
original author or publisher of that section if known, or else a
unique number. Make the same adjustment to the section titles in
the list of Invariant Sections in the license notice of the
combined work.
In the combination, you must combine any sections Entitled
"History" in the various original documents, forming one section
Entitled "History"; likewise combine any sections Entitled
"Acknowledgements", and any sections Entitled "Dedications". You
must delete all sections Entitled "Endorsements."
6. COLLECTIONS OF DOCUMENTS
You may make a collection consisting of the Document and other
documents released under this License, and replace the individual
copies of this License in the various documents with a single copy
that is included in the collection, provided that you follow the
rules of this License for verbatim copying of each of the documents
in all other respects.
You may extract a single document from such a collection, and
distribute it individually under this License, provided you insert
a copy of this License into the extracted document, and follow this
License in all other respects regarding verbatim copying of that
document.
7. AGGREGATION WITH INDEPENDENT WORKS
A compilation of the Document or its derivatives with other
separate and independent documents or works, in or on a volume of a
storage or distribution medium, is called an "aggregate" if the
copyright resulting from the compilation is not used to limit the
legal rights of the compilation's users beyond what the individual
works permit. When the Document is included in an aggregate, this
License does not apply to the other works in the aggregate which
are not themselves derivative works of the Document.
If the Cover Text requirement of section 3 is applicable to these
copies of the Document, then if the Document is less than one half
of the entire aggregate, the Document's Cover Texts may be placed
on covers that bracket the Document within the aggregate, or the
electronic equivalent of covers if the Document is in electronic
form. Otherwise they must appear on printed covers that bracket
the whole aggregate.
8. TRANSLATION
Translation is considered a kind of modification, so you may
distribute translations of the Document under the terms of section
4. Replacing Invariant Sections with translations requires special
permission from their copyright holders, but you may include
translations of some or all Invariant Sections in addition to the
original versions of these Invariant Sections. You may include a
translation of this License, and all the license notices in the
Document, and any Warranty Disclaimers, provided that you also
include the original English version of this License and the
original versions of those notices and disclaimers. In case of a
disagreement between the translation and the original version of
this License or a notice or disclaimer, the original version will
prevail.
If a section in the Document is Entitled "Acknowledgements",
"Dedications", or "History", the requirement (section 4) to
Preserve its Title (section 1) will typically require changing the
actual title.
9. TERMINATION
You may not copy, modify, sublicense, or distribute the Document
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense, or distribute it is void,
and will automatically terminate your rights under this License.
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the
copyright holder fails to notify you of the violation by some
reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from
that copyright holder, and you cure the violation prior to 30 days
after your receipt of the notice.
Termination of your rights under this section does not terminate
the licenses of parties who have received copies or rights from you
under this License. If your rights have been terminated and not
permanently reinstated, receipt of a copy of some or all of the
same material does not give you any rights to use it.
10. FUTURE REVISIONS OF THIS LICENSE
The Free Software Foundation may publish new, revised versions of
the GNU Free Documentation License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns. See
.
Each version of the License is given a distinguishing version
number. If the Document specifies that a particular numbered
version of this License "or any later version" applies to it, you
have the option of following the terms and conditions either of
that specified version or of any later version that has been
published (not as a draft) by the Free Software Foundation. If the
Document does not specify a version number of this License, you may
choose any version ever published (not as a draft) by the Free
Software Foundation. If the Document specifies that a proxy can
decide which future versions of this License can be used, that
proxy's public statement of acceptance of a version permanently
authorizes you to choose that version for the Document.
11. RELICENSING
"Massive Multiauthor Collaboration Site" (or "MMC Site") means any
World Wide Web server that publishes copyrightable works and also
provides prominent facilities for anybody to edit those works. A
public wiki that anybody can edit is an example of such a server.
A "Massive Multiauthor Collaboration" (or "MMC") contained in the
site means any set of copyrightable works thus published on the MMC
site.
"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
license published by Creative Commons Corporation, a not-for-profit
corporation with a principal place of business in San Francisco,
California, as well as future copyleft versions of that license
published by that same organization.
"Incorporate" means to publish or republish a Document, in whole or
in part, as part of another Document.
An MMC is "eligible for relicensing" if it is licensed under this
License, and if all works that were first published under this
License somewhere other than this MMC, and subsequently
incorporated in whole or in part into the MMC, (1) had no cover
texts or invariant sections, and (2) were thus incorporated prior
to November 1, 2008.
The operator of an MMC Site may republish an MMC contained in the
site under CC-BY-SA on the same site at any time before August 1,
2009, provided the MMC is eligible for relicensing.
ADDENDUM: How to use this License for your documents
====================================================
To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and license
notices just after the title page:
Copyright (C) YEAR YOUR NAME.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled ``GNU
Free Documentation License''.
If you have Invariant Sections, Front-Cover Texts and Back-Cover
Texts, replace the "with...Texts." line with this:
with the Invariant Sections being LIST THEIR TITLES, with
the Front-Cover Texts being LIST, and with the Back-Cover Texts
being LIST.
If you have Invariant Sections without Cover Texts, or some other
combination of the three, merge those two alternatives to suit the
situation.
If your document contains nontrivial examples of program code, we
recommend releasing these examples in parallel under your choice of free
software license, such as the GNU General Public License, to permit
their use in free software.
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