mirror of
https://github.com/joaotavora/yasnippet.git
synced 2025-10-13 21:13:04 +00:00
254 lines
7.8 KiB
ReStructuredText
254 lines
7.8 KiB
ReStructuredText
===================
|
|
Organizing snippets
|
|
===================
|
|
|
|
.. _Organizing Snippets: snippet-organization.html
|
|
.. _Expanding Snippets: snippet-expansion.html
|
|
.. _Writing Snippets: snippet-development.html
|
|
.. _The YASnippet Menu: snippet-menu.html
|
|
|
|
.. contents::
|
|
|
|
Loading snippets
|
|
================
|
|
|
|
Snippet definitions are stored in files in the filesystem. Unless you
|
|
use the simpler `bundle version <index.html@installation>`_), these
|
|
are arranged so that YASnippet can load them into *snippet
|
|
tables*. The triggering mechanisms (see `Expanding snippets`_) will
|
|
look up these snippet tables and (hopefully) expand the snippet you
|
|
intended.
|
|
|
|
The non-bundle version of YASnippet, once unpacked, comes with a full
|
|
directory of snippets, which you can copy somewhere and use. You can
|
|
also create or download more directories.
|
|
|
|
Once these directories are in place reference them in the variable
|
|
``yas/root-directory`` and load them with ``yas/load-directory``:
|
|
|
|
.. sourcecode:: common-lisp
|
|
|
|
;; Develop and keep personal snippets under ~/emacs.d/mysnippets
|
|
(setq yas/root-directory "~/emacs.d/mysnippets")
|
|
|
|
;; Load the snippets
|
|
(yas/load-directory yas/root-directory)
|
|
|
|
The point in using ``yas/root-directory`` (as opposed to calling
|
|
``yas/load-directory`` directly) is considering "~/emacs.d/mysnippets"
|
|
for snippet development, so you can use commands like
|
|
``yas/new-snippet`` and others described in section `Writing
|
|
Snippets`_.
|
|
|
|
You can make this variable a list and store more items into it:
|
|
|
|
.. sourcecode:: common-lisp
|
|
|
|
;; Develop in ~/emacs.d/mysnippets, but also
|
|
;; try out snippets in ~/Downloads/interesting-snippets
|
|
(setq yas/root-directory '("~/emacs.d/mysnippets"
|
|
"~/Downloads/interesting-snippets"))
|
|
|
|
;; Map `yas/load-directory' to every element
|
|
(mapc 'yas/load-directory yas/root-directory)
|
|
|
|
In this last example, the all the directories are loaded and their
|
|
snippets considered for expansion. However development still happens
|
|
in the first element, "~/emacs.d/mysnippets".
|
|
|
|
Organizing snippets
|
|
===================
|
|
|
|
Once you've setup ``yas/root-directory`` , you can store snippets
|
|
inside sub-directories of these directories.
|
|
|
|
Snippet definitions are put in plain text files. They are arranged by
|
|
sub-directories, and the snippet tables are named after these directories.
|
|
|
|
The name corresponds to the Emacs mode where you want expansion to
|
|
take place. For example, snippets for ``c-mode`` are put in the
|
|
``c-mode`` sub-directory. You can also skip snippet storage altogether
|
|
and use the bundle (see `YASnippet bundle`_).
|
|
|
|
Nested organization
|
|
-------------------
|
|
|
|
Here is an excerpt of a directory hierarchy containing snippets
|
|
for some modes:
|
|
|
|
.. sourcecode:: text
|
|
|
|
$ tree
|
|
.
|
|
`-- text-mode
|
|
|-- cc-mode
|
|
| |-- c-mode
|
|
| | `-- printf
|
|
| |-- for
|
|
| |-- java-mode
|
|
| | `-- println
|
|
| `-- while
|
|
|-- email
|
|
|-- perl-mode
|
|
| |-- cperl-mode
|
|
| `-- for
|
|
`-- time
|
|
|
|
A parent directory acts as a *parent table* of any of its
|
|
sub-directories. This is one of the ways different Emacs major modes
|
|
can share snippet definitions. As you can see above, ``c-mode`` and
|
|
``java-mode`` share the same parent ``cc-mode`` and its ``while``
|
|
snipepts, while all modes are share the ``time`` snippet from
|
|
``text-mode``.
|
|
|
|
This can be also used to as an *alias* -- ``cperl-mode`` is an empty
|
|
directory whose parent is ``perl-mode``.
|
|
|
|
.. image:: images/menu-parent.png
|
|
:align: right
|
|
|
|
The ``.yas-parents`` file
|
|
------------------------------
|
|
|
|
An alternate (and preferred) way of setting up parent tables consists
|
|
of placing a plain text file ``.yas-parents`` inside one of the
|
|
sub-directories. By doing this, you avoid complex directory
|
|
nesting. In the ``.yas-parents`` file you just write
|
|
whitespace-separated names of modes. This allows more flexibility and
|
|
readability of your snippet hierarchy.
|
|
|
|
.. sourcecode:: text
|
|
|
|
$ tree
|
|
.
|
|
|-- 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
|
|
|
|
The ``.yas-make-groups`` file
|
|
-----------------------------
|
|
|
|
.. image:: images/menu-groups.png
|
|
:align: right
|
|
|
|
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 `The YASnippet Menu`_ is organized
|
|
much more cleanly, as you can see in the image.
|
|
|
|
Another alternative way to achieve this is to place a ``# group:``
|
|
directive inside the snippet definition. See `Writing Snippets`_.
|
|
|
|
.. sourcecode:: text
|
|
|
|
$ tree ruby-mode/
|
|
ruby-mode/
|
|
|-- .yas-make-groups
|
|
|-- collections
|
|
| |-- each
|
|
| `-- ...
|
|
|-- control structure
|
|
| |-- forin
|
|
| `-- ...
|
|
|-- definitions
|
|
| `-- ...
|
|
`-- general
|
|
`-- ...
|
|
|
|
|
|
Using plain file names
|
|
----------------------
|
|
|
|
Normally, file names act as the snippet expansion *abbreviation* (also
|
|
known as the *snippet key* or *snippet trigger*, see `Expanding
|
|
Snippets`_).
|
|
|
|
However, if you customize the variable
|
|
``yas/ignore-filenames-as-triggers`` to be true *or* place an empty
|
|
file ``.yas-ignore-filename-triggers`` you can use much more
|
|
descriptive file names. This is useful if many snippets within a mode
|
|
share the same trigger key.
|
|
|
|
.. sourcecode:: text
|
|
|
|
$ tree rails-mode/
|
|
rails-mode/
|
|
|-- .yas-make-groups
|
|
|-- .yas-ignore-filename-triggers
|
|
|-- Insert ERb's <% __ %> or <%= __ %>.yasnippet
|
|
|-- asserts
|
|
| |-- assert(var = assigns(%3Avar)).yasnippet
|
|
| |-- assert_difference.yasnippet
|
|
| |-- assert_no_difference.yasnippet
|
|
| |-- assert_redirected_to (nested path plural).yasnippet
|
|
| |-- assert_redirected_to (nested path).yasnippet
|
|
| |-- assert_redirected_to (path plural).yasnippet
|
|
| |-- assert_redirected_to (path).yasnippet
|
|
| |-- assert_rjs.yasnippet
|
|
| `-- assert_select.yasnippet
|
|
|
|
|
|
YASnippet bundle
|
|
================
|
|
|
|
The most convenient way to define snippets for YASnippet is to put
|
|
them in a directory arranged by the mode and use
|
|
``yas/load-directory`` to load them.
|
|
|
|
However, this might slow down the Emacs start-up speed if you have many
|
|
snippets. You can use ``yas/define-snippets`` to define a bunch of
|
|
snippets for a particular mode in an Emacs-lisp file.
|
|
|
|
Since this is hard to maintain, there's a better way: define your
|
|
snippets in directory and then call ``M-x yas/compile-bundle`` to
|
|
compile it into a bundle file when you modified your snippets.
|
|
|
|
The release bundle of YASnippet is produced by
|
|
``yas/compile-bundle``. The bundle uses ``yas/define-snippets`` to
|
|
define snippets. This avoids the IO and parsing overhead when loading
|
|
snippets.
|
|
|
|
Further more, the generated bundle is a stand-alone file not depending
|
|
on ``yasnippet.el``. The released bundles of YASnippet are all
|
|
generated this way.
|
|
|
|
See the internal documentation for these functions
|
|
|
|
* ``M-x describe-function RET yas/define-snippets RET``
|
|
* ``M-x describe-function RET yas/compile-bundle RET``.
|
|
|
|
Customizable variables
|
|
======================
|
|
|
|
``yas/root-directory``
|
|
----------------------
|
|
|
|
Root directory that stores the snippets for each major mode.
|
|
|
|
If you set this from your .emacs, can also be a list of strings,
|
|
for multiple root directories. If you make this a list, the first
|
|
element is always the user-created snippets directory. Other
|
|
directories are used for bulk reloading of all snippets using
|
|
``yas/reload-all``
|
|
|
|
``yas/ignore-filenames-as-triggers``
|
|
------------------------------------
|
|
|
|
If non-nil, don't derive tab triggers from filenames.
|
|
|
|
This means a snippet without a ``# key:`` directive wont have a tab
|
|
trigger.
|
|
|
|
.. LocalWords: html YASnippet filesystem yas sourcecode setq mapc printf perl
|
|
.. LocalWords: println cperl forin filenames filename ERb's yasnippet Avar el
|
|
.. LocalWords: rjs RET
|