a little bitt more work on the documentation

[gnu-emacs-elpa] / doc / manual.org

# -*- mode: org; fill-column: 80 -*-
#+TITLE: Yet another snippet extension
#+OPTIONS: toc:1
#+STARTUP: showall

#+STYLE: <link rel="stylesheet" type="text/css" href="stylesheets/styles.css" />

# External links
#
#+LINK: smart-snippet http://code.google.com/p/smart-snippet
#+LINK: pluskid       http://pluskid.lifegoo.org

#+LINK: screencast         http://www.youtube.com/watch?v=ZCGmZK4V7Sg
#+LINK: docs               http://capitaomorte.github.com/yasnippet
#+LINK: issues             https://github.com/capitaomorte/yasnippet/issues
#+LINK: googlecode-tracker http://code.google.com/p/yasnippet/issues/list
#+LINK: forum              http://groups.google.com/group/smart-snippet


* Quick start

  *YASnippet* is a template system for Emacs. It allows you to type an
  abbreviation and automatically expand it into function templates. Bundled
  language templates includes: C, C++, C#, Perl, Python, Ruby, SQL, LaTeX, HTML,
  CSS and more. The snippet syntax is inspired from TextMate's syntax, you can
  even [[#import-textmate][import most TextMate snippets]]

  YASnippet is an original creation of [[pluskid]] who also wrote its predecessor
  [[smart-snippet]].

** Watch a demo

   [[youtube]]

** Installation

   Clone this repository somewhere

   #+begin_example
   $ cd ~/.emacs.d/plugins
   $ git clone https://github.com/capitaomorte/yasnippet
   #+end_example

   Add the following in your =.emacs= file:

   #+begin_example
   (add-to-list 'load-path
                 "~/.emacs.d/plugins/yasnippet")
   (require 'yasnippet)
   (yas/global-mode 1)
   #+end_example

   Add your own snippets to =~/.emacs.d/snippets= by placing files there or
   invoking =yas/new-snippet=.

** Import textmate snippets (rails example)
   :PROPERTIES:
   :CUSTOM_ID: import-textmate
   :END:

   YASnippet lets you use TextMate bundles directly:

   #+begin_example
   $ cd ~/.emacs.d/plugins
   $ git clone https://github.com/capitaomorte/yasnippet
   $ cd yasnippet
   $ git submodule init
   $ git submodule update
   $ gem install plist trollop
   $ rake convert_bundles             # will convert ruby, rails and html bundles from drnic
   #+end_example

   Then, in your =.emacs= file

   #+begin_example
   (add-to-list 'load-path
                 "~/.emacs.d/plugins/yasnippet")
   (require 'yasnippet)
   (setq yas/snippet-dirs '("~/.emacs.d/snippets" "~/.emacs.d/extras/imported"))
   (yas/global-mode 1)
   #+end_example

   Open some rails file (model, app, etc) and start using the textmate
   snippets. Consider that this is a work-in-progress and many snippets/commands
   might not work. Patches welcome!

** Contributing snippets

   Please *do not ask me* to add snippets to the default collection under
   =/snippets=. This collection is considered frozen. By customizing
   =yas/snippet-dirs= you can point yasnippet to good snippet collections out
   there.

   The =extras/textmate-import.rb= tool can import many actual Textmate
   snippets.  I'm focusing on developing it and the accompanying =yas-setup.el=
   files that guide it with more difficult importations. The idea is to deprecate
   =/snippets=  and replace it with =extras/imported=.

** Documentation, issues, etc

   Please refer to the comprehensive [[docs][documentation]] for full customization and
   support.  If you think you've found a bug, please report it on [[issues][the GitHub
   issue tracker]].  (please **do not** submit new issues to the old
   [[googlecode-tracker][googlecode tracker]])

   If you run into problems using YASnippet, or have snippets to contribute, post
   to the [[forum][yasnippet forum]]. Thank you very much for using YASnippet!

* Organizing snippets

** Basic structure

   Snippet collections can be stored in plain text files. They are arranged by
   sub-directories naming *snippet tables*. These mostly name Emacs major names.

   #+begin_example
   .
   |-- c-mode
   |   =-- printf
   |-- java-mode
   |   =-- println
   =-- text-mode
       |-- email
       =-- time
   #+end_example

   The collections are loaded into *snippet tables* which the triggering mechanism
   (see [[#expand-snippets][Expanding snippets]]) looks up and (hopefully) cause the right snippet to
   be expanded for you.

** Setting up =yas/snippet-dirs=

   An emacs variable =yas/snippet-dirs= tells YASnippet which collections to
   consider. It's used when you activate =yas/global-mode= or call
   =yas/reload-all= interactively.

   The default considers:

    - a personal collection that lives in =~/.emacs.d/snippets=
    - the bundled collection, taken as a relative path to =yasnippet.el= localtion

   When you come across other snippet collections, do the following to try them
   out:

   #+begin_src emacs-lisp :exports both
   ;; Develop in ~/emacs.d/mysnippets, but also
   ;; try out snippets in ~/Downloads/interesting-snippets
   (setq yas/snippet-dirs '("~/emacs.d/mysnippets"
                              "~/Downloads/interesting-snippets"))

   ;; OR, keeping yasnippet's defaults try out ~/Downloads/interesting-snippets
   (setq yas/snippet-dirs (append yas/snippet-dirs
                                  '("~/Downloads/interesting-snippets")))
   #+end_src

   Collections appearing earlier in the list shadow snippets with same names
   appearing in collections later in the list. =yas/new-snippet= always stores
   snippets in the first collection.

** The =.yas.parents= file

   It's very useful to have certain modes share snippets between themselves. To do
   this, choose a mode subdirectory and place a =.yas-parents= containing a
   whitespace-separated list of other mode names. When you reload those modes
   become parents of the original mode.

   #+begin_example
   .
   |-- c-mode
   |   |-- .yas-parents    # contains "cc-mode text-mode"
   |   =-- printf
   |-- cc-mode
   |   |-- for
   |   =-- while
   |-- java-mode
   |   |-- .yas-parents    # contains "cc-mode text-mode"
   |   =-- println
   =-- text-mode
       |-- email
       =-- time
   #+end_example

** TODO The =.yas-make-groups= file

   If you place an empty plain text file =.yas-make-groups= inside one of the
   mode directories, the names of these sub-directories are considered groups of
   snippets and [[snippet-menu][the menu]] is organized much more cleanly:

   (TODO image)

   Another alternative way to achieve this is to place a ==# group:==
   directive inside the snippet definition. See =Writing Snippets=_.

   #+begin_example
   $ tree ruby-mode/
   ruby-mode/
   |-- .yas-make-groups
   |-- collections
   |   |-- each
   |   =-- ...
   |-- control structure
   |   |-- forin
   |   =-- ...
   |-- definitions
   |   =-- ...
   =-- general
      =-- ...
   #+end_example

   Yet another way to create a nice snippet menu is to write into
   =.yas-make-groups= a

** TODO The =.yas-setup.el= file

*** TODO

** TODO The =.yas-compiled-snippet.el= file

*** TODO

** The =.yas-skip= file

* Expanding Snippets

   :PROPERTIES:
   :CUSTOM_ID: expand-snippets
   :END:

  This section describes how YASnippet chooses snippets for expansion at point.

  Maybe, you'll want some snippets to be expanded in a particular
  mode, or only under certain conditions, or be prompted using

** Triggering expansion

You can use YASnippet to expand snippets in different ways:

  * Typing an abbreviation, the snippet *trigger key*, and then pressing the key
    defined in ==yas/trigger-key== (usually to "TAB"). This works in buffers
    where the minor mode ==yas/minor-mode== is active;

  * By invoking the command ==yas/insert-snippet== (either by typing ==M-x
    yas/insert-snippet== or its keybinding). This does *not*
    require ==yas/minor-mode== to be active.

  * By using the keybinding associated with an active snippet. This also
    requires ==yas/minor-mode== to be active;

  * By expanding directly from the "YASnippet" menu in the menu-bar

  * By using hippie-expand

  * Use m2m's excellent auto-complete

# \* Expanding from emacs-lisp code

# Trigger key
# -----------

# When ==yas/minor-mode== is enabled, the keybinding taken from
# ==yas/trigger-key== will take effect.

# ==yas/trigger-key== invokes ==yas/expand==, which tries to expand a
# \*snippet abbrev* (also known as *snippet key*) before point.

# The default key is =="TAB"==, however, you can freely set it to some
# other key.

# .. image:: images/minor-mode-indicator.png
#    :align: left

# To enable the YASnippet minor mode in all buffers globally use the
# command ==yas/global-mode==.

# When you use ==yas/global-mode== you can also selectively disable
# YASnippet in some buffers by setting the buffer-local variable
# ==yas/dont-active== in the buffer's mode hook.

# Trouble when using or understanding the ==yas/trigger-key== is easily
# the most controversial issue in YASsnippet. See the =FAQ <faq.html>=_.

# Fallback bahaviour
# ~~~~~~~~~~~~~~~~~~

# ==yas/fallback-behaviour== is a customization variable bound to
# =='call-other-command== by default. If ==yas/expand== failed to find
# any suitable snippet to expand, it will disable the minor mode
# temporarily and find if there's any other command bound the
# ==yas/trigger-key==.

# If found, the command will be called. Usually this works very well --
# when there's a snippet, expand it, otherwise, call whatever command
# originally bind to the trigger key.

# However, you can change this behavior by customizing the
# ==yas/fallback-behavior== variable. If you set this variable to
# =='return-nil==, it will return ==nil== instead of trying to call the
# \*original* command when no snippet is found.

# Insert at point
# ---------------

# The command ==M-x yas/insert-snippet== lets you insert snippets at
# point *for you current major mode*. It prompts you for the snippet
# key first, and then for a snippet template if more than one template
# exists for the same key.

# The list presented contains the snippets that can be inserted at
# point, according to the condition system. If you want to see all
# applicable snippets for the major mode, prefix this command with
# ==C-u==.

# The prompting methods used are again controlled by
# ==yas/prompt-functions==.

# Snippet keybinding
# ------------------

# See the section of the ==# binding:== directive in =Writing
# Snippets=_.


# Expanding from the menu
# -----------------------

# See =the YASnippet Menu=_.

# Expanding with ==hippie-expand==
# ----------------------------------

# To integrate with ==hippie-expand==, just put
# ==yas/hippie-try-expand== in
# ==hippie-expand-try-functions-list==. This probably makes more sense
# when placed at the top of the list, but it can be put anywhere you
# prefer.

# Expanding from emacs-lisp code
# ------------------------------

# Sometimes you might want to expand a snippet directly from you own
# elisp code. You should call ==yas/expand-snippet== instead of
# ==yas/expand== in this case.

# As with expanding from the menubar, the condition system and multiple
# candidates doesn't affect expansion. In fact, expanding from the
# YASnippet menu has the same effect of evaluating the follow code:

# .. sourcecode:: common-lisp

#   (yas/expand-snippet template)

# See the internal documentation on ==yas/expand-snippet== for more
# information.

# Controlling expansion
# =====================

# Eligible snippets
# -----------------

# YASnippet does quite a bit of filtering to find out which snippets are
# eligible for expanding at the current cursor position.

# In particular, the following things matter:

# \* Currently loaded snippets tables

#   These are loaded from a directory hierarchy in your file system. See
#   =Organizing Snippets=_. They are named after major modes like
#   ==html-mode==, ==ruby-mode==, etc...

# \* Major mode of the current buffer

#   If the currrent major mode matches one of the loaded snippet tables,
#   then all that table's snippets are considered for expansion. Use
#   ==M-x describe-variable RET major-mode RET== to find out which major
#   mode you are in currently.

# \* Parent tables

#   Snippet tables defined as the parent of some other eligible table
#   are also considered. This works recursively, i.e. parents of parents
#   of eligible tables are also considered.

# \* Buffer-local ==yas/mode-symbol== variable

#   This can be used to consider snippet tables whose name does not
#   correspond to a major mode. If you set this variable to a name ,
#   like ==rinari-minor-mode==, you can have some snippets expand only
#   in that minor mode. Naturally, you want to set this conditionally,
#   i.e. only when entering that minor mode, so using a hook is a good
#   idea.

# .. sourcecode:: common-lisp

#   ;; When entering rinari-minor-mode, consider also the snippets in the
#   ;; snippet table "rails-mode"
#   (add-hook 'rinari-minor-mode-hook
#             #'(lambda ()
#                 (setq yas/mode-symbol 'rails-mode)))

# \* Buffer-local ==yas/buffer-local-condition== variable

#   This variable provides finer grained control over what snippets can
#   be expanded in the current buffer. The default value won't let you
#   expand snippets inside comments or string literals for example. See
#   =The condition system=_ for more info.

# The condition system
# --------------------

# Consider this scenario: you are an old Emacs hacker. You like the
# abbrev-way and set ==yas/trigger-key== to =="SPC"==. However,
# you don't want ==if== to be expanded as a snippet when you are typing
# in a comment block or a string (e.g. in ==python-mode==).

# If you use the ==# condition :== directive (see =Writing Snippets=_)
# you could just specify the condition for ==if== to be ==(not
# (python-in-string/comment))==. But how about ==while==, ==for==,
# etc. ? Writing the same condition for all the snippets is just
# boring. So has a buffer local variable
# ==yas/buffer-local-condition==. You can set this variable to ==(not
# (python-in-string/comment))== in ==python-mode-hook==.

# Then, what if you really want some particular snippet to expand even
# inside a comment? This is also possible! But let's stop telling the
# story and look at the rules:

# \* If ==yas/buffer-local-condition== evaluate to nil, no snippets will
#   be considered for expansion.

# \* If it evaluates to the a *cons cell* where the ==car== is the symbol
#   ==require-snippet-condition== and the ==cdr== is a symbol (let's
#   call it ==requirement==), then:

#   * Snippets having no ==# condition:== directive won't be considered;

#   * Snippets with conditions that evaluate to nil (or produce an
#     error) won't be considered;

#   * If the snippet has a condition that evaluates to non-nil (let's
#     call it ==result==):

#     * If ==requirement== is ==t==, the snippet is ready to be
#       expanded;

#     * If ==requirement== is ==eq== to ==result==, the snippet is ready
#       to be expanded;

#     * Otherwise the snippet won't be considered.

# \* If it evaluates to the symbol ==always==, all snippets are
#   considered for expansion, regardless of any conditions.

# \* If it evaluate to ==t== or some other non-nil value:

#   * If the snippet has no condition, or has a condition that evaluate
#     to non-nil, it is ready to be expanded.

#   * Otherwise, it won't be considered.

# In the mentioned scenario, set ==yas/buffer-local-condition== like
# this

# .. sourcecode:: common-lisp

#   (add-hook 'python-mode-hook
#             '(lambda ()
#                (setq yas/buffer-local-condition
#                      '(if (python-in-string/comment)
#                           '(require-snippet-condition . force-in-comment)
#                         t))))

# ... and specify the condition for a snippet that you're going to
# expand in comment to be evaluated to the symbol
# ==force-in-comment==. Then it can be expanded as you expected, while
# other snippets like ==if== still can't expanded in comment.

# Multiples snippet with the same key
# -----------------------------------

# The rules outlined =above <Eligible snippets>=_ can return more than
# one snippet to be expanded at point.

# When there are multiple candidates, YASnippet will let you select
# one. The UI for selecting multiple candidate can be customized through
# ==yas/prompt-functions== , which defines your preferred methods of
# being prompted for snippets.

# You can customize it with ==M-x customize-variable RET
# yas/prompt-functions RET==. Alternatively you can put in your
# emacs-file:

# .. sourcecode:: common-lisp

#    (setq yas/prompt-functions '(yas/x-prompt yas/dropdown-prompt))

# Currently there are some alternatives solution with YASnippet.

# .. image:: images/x-menu.png
#    :align: right

# Use the X window system
# ~~~~~~~~~~~~~~~~~~~~~~~

# The function ==yas/x-prompt== can be used to show a popup menu for you
# to select. This menu will be part of you native window system widget,
# which means:

# \* It usually looks beautiful. E.g. when you compile Emacs with gtk
#   support, this menu will be rendered with your gtk theme.
# \* Your window system may or may not allow to you use ==C-n==, ==C-p==
#   to navigate this menu.
# \* This function can't be used when in a terminal.

# .. image:: images/ido-menu.png
#    :align: right

# Minibuffer prompting
# ~~~~~~~~~~~~~~~~~~~~

# You can use functions ==yas/completing-prompt== for the classic emacs
# completion method or ==yas/ido-prompt== for a much nicer looking
# method. The best way is to try it. This works in a terminal.

# .. image:: images/dropdown-menu.png
#    :align: right

# Use ==dropdown-menu.el==
# ~~~~~~~~~~~~~~~~~~~~~~~~

# The function ==yas/dropdown-prompt== can also be placed in the
# ==yas/prompt-functions== list.

# This works in both window system and terminal and is customizable, you
# can use ==C-n==, ==C-p== to navigate, ==q== to quit and even press
# ==6== as a shortcut to select the 6th candidate.

# Roll your own
# ~~~~~~~~~~~~~

# See below for the documentation on variable ==yas/prompt-functions==

# Customizable Variables
# ======================

# ==yas/prompt-functions==
# ------------------------

# You can write a function and add it to the ==yas/prompt-functions==
# list. These functions are called with the following arguments:

# \* PROMPT: A string to prompt the user;

# \* CHOICES: A list of strings or objects;

# \* optional DISPLAY-FN : A function. When applied to each of the
#   objects in CHOICES it will return a string;

# The return value of any function you put here should be one of
# the objects in CHOICES, properly formatted with DISPLAY-FN (if
# that is passed).

# \* To signal that your particular style of prompting is unavailable at
#   the moment, you can also have the function return nil.

# \* To signal that the user quit the prompting process, you can signal
#   ==quit== with ==(signal 'quit "user quit!")==

# ==yas/fallback-behavior==
# -------------------------

# How to act when ==yas/expand== does *not* expand a snippet.

# ==call-other-command== means try to temporarily disable YASnippet and
#     call the next command bound to ==yas/trigger-key==.

# ==return-nil== means return nil. (i.e. do nothing)

# An entry (apply COMMAND . ARGS) means interactively call COMMAND, if
# ARGS is non-nil, call COMMAND non-interactively with ARGS as
# arguments.

# ==yas/choose-keys-first==
# -------------------------

# If non-nil, prompt for snippet key first, then for template.

# Otherwise prompts for all possible snippet names.

# This affects ==yas/insert-snippet== and ==yas/visit-snippet-file==.

# ==yas/choose-tables-first==
# ---------------------------

# If non-nil, and multiple eligible snippet tables, prompts user for
# tables first.

# Otherwise, user chooses between the merging together of all
# eligible tables.

# This affects ==yas/insert-snippet==, ==yas/visit-snippet-file==

# ==yas/key-syntaxes==
# --------------------

# The default searching strategy is quite powerful. For example, in
# ==c-mode==, ==bar==, ==foo_bar==, =="#foo_bar"== can all be recognized
# as a snippet key. Furthermore, the searching is in that order. In
# other words, if ==bar== is found to be a key to some *valid* snippet,
# then that snippet is expanded and replaces the ==bar==. Snippets
# pointed to by ==foo_bar== and =="#foobar== won't be considered.

# However, this strategy can also be customized easily from the
# ==yas/key-syntaxes== variable. It is a list of syntax rules, the
# default value is ==("w" "w_" "w_." "^ ")==. Which means search the
# following thing until found one:

# \* a word.
# \* a symbol. In lisp, ==-== and ==?== can all be part of a symbol.
# \* a sequence of characters of either word, symbol or punctuation.
# \* a sequence of characters of non-whitespace characters.

# But you'd better keep the default value unless you want to understand
# how Emacs's syntax rules work...



# * snippet-development.org
# ================
# Writing snippets
# ================

# .. _Organizing Snippets: snippet-organization.html
# .. _Expanding Snippets: snippet-expansion.html
# .. _Writing Snippets: snippet-development.html
# .. _The YASnippet Menu: snippet-menu.html

# .. contents::

# Snippet development
# ===================

# Quickly finding snippets
# ------------------------

# There are some ways you can quickly find a snippet file:

# \* ==M-x yas/new-snippet==

#   Prompts you for a snippet name, then tries to guess a suitable
#   directory to store it, prompting you for creation if it does not
#   exist. Finally, places you in a new buffer set to ==snippet-mode==
#   so you can write your snippet.

# \* ==M-x yas/find-snippets==

#   Lets you find the snippet file in the directory the snippet was
#   loaded from (if it exists) like ==find-file-other-window==. The
#   directory searching logic is similar to ==M-x yas/new-snippet==.

# \* ==M-x yas/visit-snippet-file==

#   Prompts you for possible snippet expansions like
#   ==yas/insert-snippet==, but instead of expanding it, takes you
#   directly to the snippet definition's file, if it exists.

# Once you find this file it will be set to ==snippet-mode== (see ahead)
# and you can start editing your snippet.


# Using the ==snippet-mode== major mode
# -------------------------------------

# There is a major mode ==snippet-mode== to edit snippets. You can set
# the buffer to this mode with ==M-x snippet-mode==. It provides
# reasonably useful syntax highlighting.

# Two commands are defined in this mode:

# \* ==M-x yas/load-snippet-buffer==

#     When editing a snippet, this loads the snippet into the correct
#     mode and menu. Bound to ==C-c C-c== by default while in
#     ==snippet-mode==.

# \* ==M-x yas/tryout-snippet==

#     When editing a snippet, this opens a new empty buffer, sets it to
#     the appropriate major mode and inserts the snippet there, so you
#     can see what it looks like. This is bound to ==C-c C-t== while in
#     ==snippet-mode==.

# There are also *snippets for writing snippets*: ==vars==, ==$f== and
# ==$m== :-).

# File content
# ============

# A file defining a snippet generally contains the template to be
# expanded.

# Optionally, if the file contains a line of ==# --==, the lines above
# it count as comments, some of which can be *directives* (or meta
# data). Snippet directives look like ==# property: value== and tweak
# certain snippets properties described below. If no ==# --== is found,
# the whole file is considered the snippet template.

# Here's a typical example:

# .. sourcecode:: text

#   # contributor: pluskid <pluskid@gmail.com>
#   # name: __...__
#   # --
#   __${init}__

# Here's a list of currently supported directives:

# ==# key:== snippet abbrev
# --------------------------

# This is the probably the most important directive, it's the abbreviation you
# type to expand a snippet just before hitting ==yas/trigger-key==. If you don't
# specify this the snippet will not be expandable through the key mechanism.

# ==# name:== snippet name
# ------------------------

# This is a one-line description of the snippet. It will be displayed in
# the menu. It's a good idea to select a descriptive name for a
# snippet -- especially distinguishable among similar snippets.

# If you omit this name it will default to the file name the snippet was
# loaded from.

# ==# condition:== snippet condition
# ----------------------------------
# This is a piece of Emacs-lisp code. If a snippet has a condition, then it
# will only be expanded when the condition code evaluate to some non-nil
# value.

# See also ==yas/buffer-local-condition== in =Expanding snippets=_


# ==# group:== snippet menu grouping
# ----------------------------------

# When expanding/visiting snippets from the menu-bar menu, snippets for a
# given mode can be grouped into sub-menus . This is useful if one has
# too many snippets for a mode which will make the menu too
# long.

# The ==# group:== property only affect menu construction (See =the
# YASnippet menu=_) and the same effect can be achieved by grouping
# snippets into sub-directories and using the ==.yas-make-groups==
# special file (for this see =Organizing Snippets=_


# Refer to the bundled snippets for ==ruby-mode== for examples on the
# ==# group:== directive. Group can also be nested, e.g.  ==control
# structure.loops== tells that the snippet is under the ==loops== group
# which is under the ==control structure== group.

# ==# expand-env:== expand environment
# ------------------------------------

# This is another piece of Emacs-lisp code in the form of a ==let==
# \*varlist form*, i.e. a list of lists assigning values to variables. It
# can be used to override variable values while the snippet is being
# expanded.

# Interesting variables to override are ==yas/wrap-around-region== and
# ==yas/indent-line== (see =Expanding Snippets=_).

# As an example, you might normally have ==yas/indent-line== set to
# =='auto== and ==yas/wrap-around-region== set to ==t==, but for this
# particularly brilliant piece of ASCII art these values would mess up
# your hard work. You can then use:

# .. sourcecode:: text

#   # name: ASCII home
#   # expand-env: ((yas/indent-line 'fixed) (yas/wrap-around-region 'nil))
#   # --
#                   welcome to my
#               X      humble
#              / \      home,
#             /   \      $0
#            /     \
#           /-------\
#           |       |
#           |  +-+  |
#           |  | |  |
#           +--+-+--+

# ==# binding:== direct keybinding
# ---------------------------------

# You can use this directive to expand a snippet directly from a normal
# Emacs keybinding. The keybinding will be registered in the Emacs
# keymap named after the major mode the snippet is active
# for.

# Additionally a variable ==yas/prefix== is set to to the prefix
# argument you normally use for a command. This allows for small
# variations on the same snippet, for example in this "html-mode"
# snippet.

# .. sourcecode:: text

#   # name: <p>...</p>
#   # binding: C-c C-c C-m
#   # --
#   <p>=(when yas/prefix "\n")=$0=(when yas/prefix "\n")=</p>

# This binding will be recorded in the keymap
# ==html-mode-map==. To expand a paragraph tag newlines, just
# press ==C-u C-c C-c C-m==. Omitting the ==C-u== will expand the
# paragraph tag without newlines.

# ==# contributor:== snippet author
# ---------------------------------------------------

# This is optional and has no effect whatsoever on snippet
# functionality, but it looks nice.

# Template syntax
# ===============

# The syntax of the snippet template is simple but powerful, very
# similar to TextMate's.

# Plain Text
# ----------

# Arbitrary text can be included as the content of a template. They are
# usually interpreted as plain text, except ==$== and =====. You need to
# use ==\== to escape them: ==\$== and ==\===. The ==\== itself may also
# needed to be escaped as ==\\== sometimes.

# Embedded Emacs-lisp code
# ------------------------

# Emacs-Lisp code can be embedded inside the template, written inside
# back-quotes (=====). The lisp forms are evaluated when the snippet is
# being expanded. The evaluation is done in the same buffer as the
# snippet being expanded.

# Here's an example for ==c-mode== to calculate the header file guard
# dynamically:

# .. sourcecode:: text

#   #ifndef ${1:_=(upcase (file-name-nondirectory (file-name-sans-extension (buffer-file-name))))=_H_}
#   #define $1

#   $0

#   #endif /* $1 */

# From version 0.6, snippets expansions are run with some special
# Emacs-lisp variables bound. One of this is ==yas/selected-text==. You
# can therefore define a snippet like:

# .. sourcecode:: text

#    for ($1;$2;$3) {
#      =yas/selected-text=$0
#    }

# to "wrap" the selected region inside your recently inserted
# snippet. Alternatively, you can also customize the variable
# ==yas/wrap-around-region== to ==t== which will do this automatically.

# Tab stop fields
# ---------------

# Tab stops are fields that you can navigate back and forth by ==TAB==
# and ==S-TAB==. They are written by ==$== followed with a
# number. ==$0== has the special meaning of the *exit point* of a
# snippet. That is the last place to go when you've traveled all the
# fields. Here's a typical example:

# .. sourcecode:: text

#   <div$1>
#       $0
#   </div>

# Placeholder fields
# ------------------

# Tab stops can have default values -- a.k.a placeholders. The syntax is
# like this:

# .. sourcecode:: text

#   ${N:default value}

# They acts as the default value for a tab stop. But when you firstly
# type at a tab stop, the default value will be replaced by your
# typing. The number can be omitted if you don't want to create
# =mirrors=_ or =transformations=_ for this field.

# .. _mirrors:

# Mirrors
# -------

# We refer the tab stops with placeholders as a *field*. A field can have
# mirrors. Its mirrors will get updated when you change the text of a
# field. Here's an example:

# .. sourcecode:: text

#   \begin{${1:enumerate}}
#       $0
#   \end{$1}

# When you type =="document"== at ==${1:enumerate}==, the word
# =="document"== will also be inserted at ==\end{$1}==. The best
# explanation is to see the screencast(=YouTube
# <http://www.youtube.com/watch?v=vOj7btx3ATg>=_ or =avi video
# <http://yasnippet.googlecode.com/files/yasnippet.avi>=_).

# The tab stops with the same number to the field act as its mirrors. If
# none of the tab stops has an initial value, the first one is selected
# as the field and others mirrors.

# .. _transformations:

# Mirrors with transformations
# ----------------------------

# If the value of an ==${n:==-construct starts with and contains ==$(==,
# then it is interpreted as a mirror for field ==n== with a
# transformation. The mirror's text content is calculated according to
# this transformation, which is Emacs-lisp code that gets evaluated in
# an environment where the variable ==text== (or ==yas/text==) is bound
# to the text content (string) contained in the field ==n==.Here's an
# example for Objective-C:

# .. sourcecode:: text

#   - (${1:id})${2:foo}
#   {
#       return $2;
#   }

#   - (void)set${2:$(capitalize text)}:($1)aValue
#   {
#       [$2 autorelease];
#       $2 = [aValue retain];
#   }
#   $0

# Look at ==${2:$(capitalize text)}==, it is a mirror with
# transformation instead of a field. The actual field is at the first
# line: ==${2:foo}==. When you type text in ==${2:foo}==, the
# transformation will be evaluated and the result will be placed there
# as the transformed text. So in this example, if you type "baz" in the
# field, the transformed text will be "Baz". This example is also
# available in the screencast.

# Another example is for ==rst-mode==. In reStructuredText, the document
# title can be some text surrounded by "===" below and above. The "==="
# should be at least as long as the text. So

# .. sourcecode:: text

#   =====
#   Title
#   =====

# is a valid title but

# .. sourcecode:: text

#   ===
#   Title
#   ===

# is not. Here's an snippet for rst title:

# .. sourcecode:: text

#   ${1:$(make-string (string-width text) ?\=)}
#   ${1:Title}
#   ${1:$(make-string (string-width text) ?\=)}

#   $0

# Fields with transformations
# ---------------------------

# From version 0.6 on, you can also have lisp transformation inside
# fields. These work mostly mirror transformations but are evaluated
# when you first enter the field, after each change you make to the
# field and also just before you exit the field.

# The syntax is also a tiny bit different, so that the parser can
# distinguish between fields and mirrors. In the following example

# .. sourcecode:: text

#   #define "${1:mydefine$(upcase yas/text)}"

# ==mydefine== gets automatically upcased to ==MYDEFINE== once you enter
# the field. As you type text, it gets filtered through the
# transformation every time.

# Note that to tell this kind of expression from a mirror with a
# transformation, YASnippet needs extra text between the ==:== and the
# transformation's ==$==. If you don't want this extra-text, you can use
# two ==$=='s instead.

# .. sourcecode:: text

#   #define "${1:$$(upcase yas/text)}"

# Please note that as soon as a transformation takes place, it changes
# the value of the field and sets it its internal modification state to
# ==true==. As a consequence, the auto-deletion behaviour of normal
# fields does not take place. This is by design.

# Choosing fields value from a list and other tricks
# --------------------------------------------------

# As mentioned, the field transformation is invoked just after you enter
# the field, and with some useful variables bound, notably
# ==yas/modified-p== and ==yas/moving-away-p==. Because of this
# feature you can place a transformation in the primary field that lets
# you select default values for it.

# The ==yas/choose-value== does this work for you. For example:

# .. sourcecode:: text

#   <div align="${2:$$(yas/choose-value '("right" "center" "left"))}">
#     $0
#   </div>

# See the definition of ==yas/choose-value== to see how it was written
# using the two variables.

# Here's another use, for LaTeX-mode, which calls reftex-label just as
# you enter snippet field 2. This one makes use of ==yas/modified-p==
# directly.

# .. sourcecode:: text

#   \section{${1:"Titel der Tour"}}%
#   \index{$1}%
#   \label{{2:"waiting for reftex-label call..."$(unless yas/modified-p (reftex-label nil 'dont-
#   insert))}}%

# The function ==yas/verify-value== has another neat trick, and makes
# use of ==yas/moving-away-p==. Try it and see! Also, check out this
# =thread
# <http://groups.google.com/group/smart-snippet/browse_thread/thread/282a90a118e1b662>=_

# Nested placeholder fields
# -------------------------

# From version 0.6 on, you can also have nested placeholders of the type:

# .. sourcecode:: text

#    <div${1: id="${2:some_id}"}>$0</div>

# This allows you to choose if you want to give this ==div== an ==id==
# attribute. If you tab forward after expanding it will let you change
# "some_id" to whatever you like. Alternatively, you can just press
# ==C-d== (which executes ==yas/skip-and-clear-or-delete-char==) and go
# straight to the exit marker.

# By the way, ==C-d== will only clear the field if you cursor is at the
# beginning of the field *and* it hasn't been changed yet. Otherwise, it
# performs the normal Emacs ==delete-char== command.

# Customizable variables
# ======================

# ==yas/trigger-key==
# -------------------

# The key bound to ==yas/expand== when function ==yas/minor-mode== is
# active.

# Value is a string that is converted to the internal Emacs key
# representation using ==read-kbd-macro==.

# Default value is =="TAB"==.

# ==yas/next-field-key==
# ----------------------

# The key to navigate to next field when a snippet is active.

# Value is a string that is converted to the internal Emacs key
# representation using ==read-kbd-macro==.

# Can also be a list of keys.

# Default value is =="TAB"==.

# ==yas/prev-field-key==
# ----------------------

# The key to navigate to previous field when a snippet is active.

# Value is a string that is converted to the internal Emacs key
# representation using ==read-kbd-macro==.

# Can also be a list of keys.

# Default value is ==("<backtab>" "<S-tab>)"==.

# ==yas/skip-and-clear-key==
# --------------------------

# The key to clear the currently active field.

# Value is a string that is converted to the internal Emacs key
# representation using ==read-kbd-macro==.

# Can also be a list of keys.

# Default value is =="C-d"==.

# ==yas/good-grace==
# ------------------

# If non-nil, don't raise errors in inline Emacs-lisp evaluation inside
# snippet definitions. An error string "[yas] error" is returned instead.

# ==yas/indent-line==
# -------------------

# The variable ==yas/indent-line== controls the indenting. It is bound
# to =='auto== by default, which causes your snippet to be indented
# according to the mode of the buffer it was inserted in.

# Another variable ==yas/also-auto-indent-first-line==, when non-nil
# does exactly that :-).

# To use the hard-coded indentation in your snippet template, set this
# variable to ==fixed==.

# To control indentation on a per-snippet basis, see also the directive
# ==# expand-env:== in =Writing Snippets=_.

# For backward compatibility with earlier versions of YASnippet, you can
# also place a ==$>== in your snippet, an ==(indent-according-to-mode)==
# will be executed there to indent the line. This only takes effect when
# ==yas/indent-line== is set to something other than =='auto==.

# .. sourcecode:: text

#   for (${int i = 0}; ${i < 10}; ${++i})
#   {$>
#   $0$>
#   }$>

# ==yas/wrap-around-region==
# --------------------------

# If non-nil, YASnippet will try to expand the snippet's exit marker
# around the currently selected region. When this variable is set to t,
# this has the same effect has using the ===yas/selected-text=== inline
# evaluation.

# Because on most systems starting to type deletes the currently
# selected region, this works mostly for snippets with direct
# keybindings or with the ==yas/insert-snippet== command.

# However, when the value is of this variable is ==cua== YASnippet will
# additionally look-up any recently selected that you deleted by starting
# typing. This allows you select a region, type a snippet key (deleting
# the region), then press ==yas/trigger-key== to see the deleted region
# spring back to life inside your new snippet.

# ==yas/triggers-in-field==
# --------------------------

# If non-nil, ==yas/next-field-key== can trigger stacked expansions,
# that is a snippet expansion inside another snippet
# expansion. Otherwise, ==yas/next-field-key== just tries to move on to
# the next field.

# ==yas/snippet-revival==
# -----------------------

# Non-nil means re-activate snippet fields after undo/redo.

# ==yas/after-exit-snippet-hook== and ==yas/before-expand-snippet-hook==
# ----------------------------------------------------------------------

# These hooks are called, respectively, before the insertion of a
# snippet and after exiting the snippet. If you find any strange but
# functional use for them, that's probably a design flaw in YASnippet,
# so let us know.

# Importing TextMate snippets
# ===========================

# There are a couple of tools that take TextMate's ".tmSnippet" xml
# files and create YASnippet definitions:

#  * =a python script by Jeff Wheeler
#    <http://code.nokrev.com/?p=snippet-copier.git;a=blob_plain;f=snippet_copier.py>=_

#  * a =ruby tool
#    <http://yasnippet.googlecode.com/svn/trunk/extras/textmate_import.rb>=_
#    , ==textmate_import.rb== adapted from =Rob Christie's
#    <http://www.neutronflux.net/2009/07/28/shoulda-snippets-for-emacs/>=_,
#    which I have uploaded to the repository.

# In this section, i'll shortly cover the **second** option.

# Download the ==textmate_import.rb== tool and the TextMate
# bundle you're interested in.

# .. sourcecode:: text

#   $ curl -O http://yasnippet.googlecode.com/svn/trunk/extras/textmate_import.rb
#   $ svn export http://svn.textmate.org/trunk/Bundles/HTML.tmbundle/


# Then invoke ==textmate_import.rb== like this:

# .. sourcecode:: text

#   $ ./textmate_import.rb -d HTML.tmbundle/Snippets/ -o html-mode -g HTML.tmbundle/info.plist

# You should end up with a ==html-mode== subdir containing snippets
# exported from textmate.

# .. sourcecode:: text

#   $ tree html-mode # to view dir contents, if you have 'tree' installed

# The ==-g== is optional but helps the tool figure out the grouping.
# According to =Organizing Snippets=_, don't forget to touch
# ==.yas-make-groups== and ==.yas-ignore-filename-triggers== inside the
# ==html-mode== dir.

# Also try ==textmate_import.rb --help== for a list of options.

# Please note that snippet importation is not yet perfect. You'll
# probably have some adjustments to some/many snippets. Please
# contribute these adjustments to the google group or, better yet, patch
# the ==textmate_import.rb== to automatically perform them and submit
# that.

# ..  LocalWords:  html YASnippet yas sourcecode pluskid init filenames filename
# ..  LocalWords:  env varlist keybinding keymap rinari ifndef upcase endif
# ..  LocalWords:  nondirectory autorelease aValue inline

# * snippet-menu.org
# ==============
# YASnippet menu
# ==============

# .. contents::

# When ==yas/minor-mode== is active, YASnippet will setup a menu just
# after the "Buffers" menu in the menubar.

# In this menu, you can find

# \* The currently loaded snippet definitions, organized by major mode,
#   and optional grouping.

# \* A rundown of the most common commands, (followed by their
#   keybindings) including commands to load directories and reload all
#   snippet definitions.

# \* A series of submenus for customizing and exploring YASnippet
#   behavior.

# .. image:: images/menu-1.png
#    :align: right

# Loading snippets from menu
# --------------------------

# Invoking "Load snippets..." from the menu invokes
# ==yas/load-directory== and prompts you for a snippet directory
# hierarchy to load.

# Also useful is the "Reload all" options which uncondionally reloads
# all the snippets directories defined in ==yas/root-directory== and
# rebuilds the menus.

# Snippet menu behavior
# ---------------------

# YASnippet will list in this section all the loaded snippet definitions
# organized by snippet table name.

# You can use this section to explore currently loaded snippets. If you
# click on one of them, the default behavior is to expand it,
# unconditionally, inside the current buffer.

# You can however, customize variable ==yas/visit-from-menu== to be
# ==t== which will take you to the snippet definition file when you
# select it from the menu.

# If you want the menu show only snippet tables whose name corresponds
# to a "real" major mode. You do this by setting ==yas/use-menu== to
# =='real-modes==.

# Finally, to have the menu show only the tables for the currently
# active mode, set ==yas/use-menu== to ==abbreviate==.

# These customizations can also be found in the menu itself, under the
# "Snippet menu behavior" submenu.


# Controlling indenting
# ---------------------

# The "Indenting" submenu contains options to control the values of
# ==yas/indent-line== and ==yas/also-auto-indent-first-line==. See
# =Writing snippets <snippet-development.html>=_ .

# Prompting method
# ----------------

# The "Prompting method" submenu contains options to control the value
# of ==yas/prompt-functions==. See =Expanding snippets <snippet-expansion.html>=_ .

# Misc
# ----

# The "Misc" submenu contains options to control the values of more
# variables.








# * faq.org
# ============================
#  Frequently Asked Questions
# ============================

# Why is there an extra newline?
# ==============================

# If you have a newline at the end of the snippet definition file, then
# YASnippet will add a newline when you expanding a snippet. Please
# don't add a newline at the end if you don't want it when you saving
# the snippet file.

# Note some editors will automatically add a newline for you. In Emacs,
# if you set ==require-final-newline== to ==t==, it will add the final
# newline for you automatically.

# Why doesn't TAB expand a snippet?
# =================================

# First check the mode line to see if there's ==yas==. If not, then try
# ==M-x yas/minor-mode== to manually turn on the minor mode and try to
# expand the snippet again. If it works, then, you can add the following
# code to your ==.emacs== *before* loading YASnippet:

# .. sourcecode:: lisp

#   (add-hook 'the-major-mode-hook 'yas/minor-mode-on)

# where ==the-major-mode== is the major mode in which ==yas/minor-mode==
# isn't enabled by default.

# From YASnippet 0.6 you can also use the command ==M-x
# yas/global-mode== to turn on YASnippet automatically for *all* major
# modes.

# If ==yas/minor-mode== is on but the snippet still not expanded. Then
# try to see what command is bound to the ==TAB== key: press ==C-h k==
# and then press ==TAB==. Emacs will show you the result.

# You'll see a buffer prompted by Emacs saying that ==TAB runs the
# command ...==. Alternatively, you might see ==<tab> runs the command
# ...==, note the difference between ==TAB== and ==<tab>== where the
# latter has priority. If you see ==<tab>== bound to a command other
# than ==yas/expand==, (e.g. in ==org-mode==) you can try the following
# code to work around:

# .. sourcecode:: lisp

#   (add-hook 'org-mode-hook
#             (let ((original-command (lookup-key org-mode-map [tab])))
#               =(lambda ()
#                  (setq yas/fallback-behavior
#                        '(apply ,original-command))
#                  (local-set-key [tab] 'yas/expand))))

# replace ==org-mode-hook== and ==org-mode-map== with the major mode
# hook you are dealing with (Use ==C-h m== to see what major mode you
# are in).

# As an alternative, you can also try

# .. sourcecode:: lisp

#   (defun yas/advise-indent-function (function-symbol)
#     (eval =(defadvice ,function-symbol (around yas/try-expand-first activate)
#              ,(format
#                "Try to expand a snippet before point, then call =%s' as usual"
#                function-symbol)
#              (let ((yas/fallback-behavior nil))
#                (unless (and (interactive-p)
#                             (yas/expand))
#                  ad-do-it)))))

#   (yas/advise-indent-function 'ruby-indent-line)

# To *advise* the modes indentation function bound to TAB, (in this case
# ==ruby-indent-line==) to first try to run ==yas/expand==.

# If the output of ==C-h k RET <tab>== tells you that ==<tab>== is
# indeed bound to ==yas/expand== but YASnippet still doesn't work, check
# your configuration and you may also ask for help on the =discussion
# group <http://groups.google.com/group/smart-snippet>=_. See this
# particular =thread
# <http://code.google.com/p/yasnippet/issues/detail?id=93&can=1>=_ for
# quite some solutions and alternatives.

# Don't forget to attach the information on what command is bound to TAB
# as well as the mode information (Can be obtained by ==C-h m==).

# Why doesn't TAB navigation work with flyspell
# =============================================

# A workaround is to inhibit flyspell overlays while the snippet is active:

# .. sourcecode:: lisp

#   (add-hook 'flyspell-incorrect-hook
#           #'(lambda (dummy1 dummy2 dymmy3)
#               (and yas/active-field-overlay
#                    (overlay-buffer yas/active-field-overlay))))

# This is apparently related to overlay priorities. For some reason, the
# ==keymap== property of flyspell's overlays always takes priority over
# the same property in yasnippet's overlays, even if one sets the
# latter's ==priority== property to something big. If you know
# emacs-lisp and can solve this problem, drop a line in the =discussion
# group=_.

# How do I turn off the minor mode where in some buffers
# ======================================================

# The best way, since version 0.6.1c, is to set the default value of the
# variable ==yas/dont-activate== to a lambda function like so:

# .. sourcecode:: lisp

#   (set-default 'yas/dont-activate
#              #'(lambda ()
#                  (and yas/root-directory
#                       (null (yas/get-snippet-tables)))))

# This is also the default value starting for that version. It skips the
# minor mode in buffers where it is not applicable (no snippet tables),
# but only once you have setup your yas/root-directory.


# How do I define an abbrev key containing characters not supported by the filesystem?
# ====================================================================================

# \**Note**: This question applies if you're still defining snippets
#   whose key *is* the filename. This is behavior stil provided by
#   version 0.6 for backward compatibilty, but is somewhat deprecated...

# For example, you want to define a snippet by the key ==<== which is
# not a valid character for filename on Windows. This means you can't
# use the filename as a trigger key in this case.

# You should rather use the ==# key:== directive to specify the key of
# the defined snippet explicitly and name your snippet with an arbitrary
# valid filename, ==lt.yasnippet== for example, using ==<== for the
# ==# key:== directive:

# .. sourcecode:: text

#   # key: <
#   # name: <...></...>
#   # --
#   <${1:div}>$0</$1>

# .. _discussion group: http://groups.google.com/group/smart-snippet

# * changelog.org
# =========
# ChangeLog
# =========

# .. _Organizing Snippets: snippet-organization.html
# .. _Expanding Snippets: snippet-expansion.html
# .. _Writing Snippets: snippet-development.html
# .. _The YASnippet Menu: snippet-menu.html

# 0.7.0b / ????-??-??
# ===================

# \* Filenames can no longer be snippet triggers. Please upgrade your snippet
#   collections.


# 0.6.1c / 2009-08-13
# ===================

# \* Fixed =issues <http://code.google.com/p/yasnippet/issues>=_ 99, 98, 93,
#   90, 91, 88, 87. Thanks everybody.
# \* More compliant customization group =Issue94
#   <http://code.google.com/p/yasnippet/issues/detail?id=94>=_, (thanks
#   wyuenho).
# \* Added workaround for issue 97 in the FAQ
# \* Small updates to documentation.

# 0.6.1b / 2009-08-29
# ===================

# \* Much more powerful menu. See =The YASnippet menu=_.
# \* New ways to organize snippets. See =Organizing snippets=_.
# \* Added ==yas/also-auto-indent-first-line== customization variable.
# \* Renamed directive ==# env:== to ==# expand-env:==
# \* Rewrote much of the documentation.
# \* Added TextMate import tool ==textmate-import.rb== to to svn
#   repository (see "extras/")
# \* Added *experimental* bundle of textmate snippets
#   ==yasnippet-textmate-bundle.el==
# \* Fixed =Issue 74
#   <http://code.google.com/p/yasnippet/issues/detail?id=74>=_ (thanks
#   rmartin.k...@gmail.com)
# \* Fixed =Issues 80 through 84
#   <http://code.google.com/p/yasnippet/issues/detail?id=80>=_ (thanks
#   Moritz Bunkus)
# \* Fixed many more issues...


# 0.6.0c / 2009-07-27
# ===================

# \* Now byte compiles correctly with no warnings.
# \* Fixed =Issue 68
#   <http://code.google.com/p/yasnippet/issues/detail?id=68>=_ with
#   mouse-clicking alternatives in ==ido-mode==.
# \* Added ==yas/also-auto-indent-first-line== customization variable.


# 0.6.0b / 2009-07-25
# ===================

# \* Nested placeholders of the type ==<div${1: id="${2:someid}"}> $0==.

# \* More robust undo/redo support.

# \* Stacked snippet expansion (*snippet in snippet*).

# \* Transformation on a primary field with syntax ==${1:default$(transform)}==

# \* Validations on field exit through the ==yas/verify-value==
#   primary field transformation.

# \* Wrapping the region in the exit marker ==$0== of the snippet. Use
#   ==yas/wrap-around-region==.

# \* Auto-indentation. Use ==yas/indent-line== set to =='auto==

# \* Easier definition of snippets. Use ==yas/find-snippets== or
#   ==yas/visit-snippet-file==. In the new ==snippet-mode== use
#   ==yas/load-snippet-buffer== and ==yas/tryout-snippet==.

# \* Customization group ==yasnippet==.

# \* Overriding customization variables in snippets. Use the ==env:
#   let-form== template keyword.

# \* Fixed =Issue 60
#   <http://code.google.com/p/yasnippet/issues/detail?id=60>=_
# \* Fixed =Issue 65
#   <http://code.google.com/p/yasnippet/issues/detail?id=65>=_
# \* Fixed =Issue 56
#   <http://code.google.com/p/yasnippet/issues/detail?id=56>=_

# 0.5.10 / 2009-02-11
# ===================

# \* Added *grouping* support so that the snippets in the menu can be
#   groupped together.
# \* Make the bundle =ELPA <http://tromey.com/elpa/index.html>=_
#   compatible.

# 0.5.9 / 2009-01-21
# ==================

# \* Fixed the bug of disabling the auto-indenting of ==cc-mode==.

# 0.5.8 / 2009-01-15
# ==================

# \* Added a ==key== property in snippet definition for snippet names
#   that are not valid path name.
# \* Fixed some bugs of indenting (=Issue 44
#   <http://code.google.com/p/yasnippet/issues/detail?id=44>=_, =Issue
#   46 <http://code.google.com/p/yasnippet/issues/detail?id=46>=_).
# \* Fixed =Issue 45
#   <http://code.google.com/p/yasnippet/issues/detail?id=45>=_ by
#   providing a proper default value for ==yas/buffer-local-condition==.
# \* Added helper function ==yas/substr== for convenient mirror
#   transformation.
# \* Make variable ==yas/registered-snippet== properly initialized.
# \* Fixed the overlay error when overlay becomes empty (=Issue 49
#   <http://code.google.com/p/yasnippet/issues/detail?id=49>=_ and
#   =Issue 48
#   <http://code.google.com/p/yasnippet/issues/detail?id=48>=_). This
#   bug has occurred and been fixed earlier, and should not have
#   happened if we have proper regression test.
# \* Added a workaround for ==c-electric-== serial commands (=Issue 27
#   <http://code.google.com/p/yasnippet/issues/detail?id=27>=_).

# 0.5.7 / 2008-12-03
# ==================

# \* Fixed =Issue 28
#   <http://code.google.com/p/yasnippet/issues/detail?id=28>=_ of
#   properly clean up snippet (by joaotavora).
# \* Added a new section "Field-level undo functionality" to correct
#   =Issue 33 <http://code.google.com/p/yasnippet/issues/detail?id=33>=_
#   (by joaotavora).
# \* Added some snippets from users for sql, erlang, scala, html, xml, latex, etc.
# \* Fixed =Issue 16
#   <http://code.google.com/p/yasnippet/issues/detail?id=16>=_ by adding
#   ==$>== support. Here's the =doc for $> indenting
#   <http://pluskid.lifegoo.com/upload/project/yasnippet/doc/define_snippet.html#indenting>=_.

# 0.5.6 / 2008-08-07
# ==================

# \* Added a buffer local variable ==yas/dont-activate== to turn off
#   ==yas/minor-mode== in some major modes. See =Issue 29
#   <http://code.google.com/p/yasnippet/issues/detail?id=29>=_.
# \* Make the environment of elisp evaluation more friendly to
#   ==(current-column)==.
# \* Fixed the regular expression bug in python-mode snippets.
# \* Use filename or full key extension for snippet name if no ==name==
#   property is defined.

# 0.5.5 / 2008-05-29
# ==================

# \* Tweak ==yas/extra-mode-hooks== so that it can be more easily
#   customized.
# \* Add an entry in FAQ about why ==TAB== key doesn't work in some
#   modes.

# 0.5.4 / 2008-05-15
# ==================

# \* Added ==ox-mode-hook== and ==python-mode-hook== to
#   ==yas/extra-mode-hooks== to fix the problem YASnippet is not enabled
#   in those modes.

# 0.5.3 / 2008-05-07
# ==================

# \* Fix indent of python-mode snippets.
# \* Fix a bug of dropdown-list: conflicts with color-theme (=Issue 23
#   <http://code.google.com/p/yasnippet/issues/detail?id=23>=_). Thanks
#   Mike.
# \* Fix a bug of condition system.

# 0.5.2 / 2008-04-20
# ==================

# \* Fix a bug for comparing string to symbol using ==string=== (which
#   will fire an error).

# 0.5.1 / 2008-04-14
# ==================

# \* Use a beautiful css style in the document.

# 0.5.0 / 2008-04-10
# ==================

# \* Integrate with hippie-expand. Just add ==yas/hippie-try-expand== to
#   ==hippie-expand-try-functions-list==.
# \* If you set ==yas/fall-back-behavior== to =='return-nil==, YASnippet
#   will return nil when it can't find a snippet to expand.
# \* Defect fix: the condition of a snippet was evaluated twice in
#   earlier version.
# \* Deleting snippet (using ==C-w== or ==C-k==) won't cause serious
#   problem now.
# \* Several complex snippet for python-mode from Yasser included in the
#   distribution.

# 0.4.5 / 2008-04-07
# ==================

# \* Merge the latest dropdown-list.el.
# \* Add snippets for f90-mode from Li Zhu.
# \* Bug fix: l-safe-expr-p: Lisp nesting exceeds ==max-lisp-eval-depth==
#   error when several (more than two) snippets overlaps. Thanks
#   sunwaybupt@newsmth for reporting this bug.

# 0.4.4 / 2008-03-24
# ==================

# \* Bug fix: dropdown-list.el doesn't recognize [return] properly.

# 0.4.3 / 2008-03-23
# ==================

# \* Bug fix: failed to recognize user customized yas/trigger-key.

# 0.4.2 / 2008-03-22
# ==================

# \* Make a separate document package for release. Also make document
#   available online.

# 0.4.1 / 2008-03-21
# ==================

# \* Make sure ==yas/minor-mode=='s key bindings always take priority to
#   other minor modes.

# 0.4.0 / 2008-03-20
# ==================

# \* Document refinement and released with YASnippet. Most of the Online
#   wiki document will be deprecated soon.
# \* Powerful condition system added to yasnippet!
# \* Incorporate ==dropdown-list.el== and make it default way for
#   selecting multiple candidates. Thanks to =Jaeyoun Chung
#   <http://groups.google.com/group/smart-snippet/browse_thread/thread/c869158b76addeb3/e7c6372ba457189e>=_.
# \* yas/before-expand-snippet-hook

# 0.3.2 / 2008-03-19
# ==================

# \* Enhancement: A better way to define minor-mode. Thanks to Kentaro
#   Kuribayashi. See =this thread
#   <https://groups.google.com/group/smart-snippet/browse_thread/thread/65cb3b5583eda887?hl=en>=_
#   for more details.

# 0.3.1 / 2008-03-17
# ==================

# \* Bug fix: Emacs get confused when a field is deleted. See =issue 10
#   <http://code.google.com/p/yasnippet/issues/detail?id=10>=_.

# 0.3.0 / 2008-03-16
# ==================

# \* Add a ==yas/after-exit-snippet-hook== so that you can do something like
#   ==indent-region== or ==fill-region== after finish the snippet.
# \* Use minor-mode instead of ==global-set-key== to bind the trigger
#   key. Now the trigger key and fall-back behavior can be more
#   flexible. Not constrained to ==<tab>==. Thanks to Trey Jackson. See
#   this =thread
#   <https://groups.google.com/group/smart-snippet/browse_thread/thread/937f32a2a6dea4f2?hl=en>=_
#   for more details.
# \* Now user can customize the popup function for selecting multiple
#   candidate for the same snippet key.
# \* Support ==dropdown-list.el== to be a better way to select multiple
#   candidate when in text mode.

# 0.2.3 / 2008-03-15
# ==================

# \* Bug in non-window (-nw) mode when there's multiple candidate to
#   expand. See =issue 7
#   <http://code.google.com/p/yasnippet/issues/detail?id=7>=_.
# \* Allow expanding another snippet as long as not currently inside a
#   field.

# 0.2.2 / 2008-03-13
# ==================

# \* Added customized face for fields and mirrors. Better in dark
#   background. And users can customize it.

# 0.2.1 / 2008-03-10
# ==================

# \* Fix the insert-behind problem under both Emacs 22 and Emacs 23.

# 0.2.0 / 2008-03-10
# ==================

# \* Use big keymap overlay to detect ==insert-behind== event manually to
#   avoid sometimes missed hook calls. See =issue 3
#   <http://code.google.com/p/yasnippet/issues/detail?id=3>=_ for more
#   details.
# \* Support parent snippet table. Now you can set (for example)
#   ==cc-mode== as common mode for ==c++-mode==, ==c-mode== and
#   ==java-mode==. They'll share snippets defined for ==cc-mode==.

# 0.1.1 / 2008-03-08
# ==================

# \* Add a rake task to upload to google code.
# \* Use elisp compile-bundle function instead of python scrip

# 0.1.0 / 2008-03-07
# ==================

# \* Embedded elisp support.
# \* Fields navigation support.
# \* Mirror of fields support.
# \* Menu-bar support.
# \* Multiple snippets with same name support.
# \* Popup menu for multiple snippet with same name support.
# \* Transformation of fields support.
# \* Load directory support.
# \* Compile bundle support.