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Intro

YASnippet is a template system for Emacs. It allows you to type an abbreviation and automatically expand it into function templates. Bundled language templates include: 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 most TextMate templates to YASnippet. Watch a demo on YouTube.

Installation

Install the most recent version

Clone this repository somewhere

$ cd ~/.emacs.d/plugins
$ git clone --recursive https://github.com/capitaomorte/yasnippet

Add the following in your .emacs file:

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

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

Install with package-install

In a recent emacs M-x list-packages is the recommended way to list and install packages. MELPA keeps a very recent snapshot of YASnippet, see http://melpa.milkbox.net/#installing.

Install with el-get

El-get is a nice way to get the most recent version, too. See https://github.com/dimitri/el-get for instructions.

Use yas-minor-mode on a per-buffer basis

To use YASnippet as a non-global minor mode, replace (yas-global-mode 1) with (yas-reload-all) to load the snippet tables. Then add a call to (yas-minor-mode) to the major-modes where you to enable YASnippet.

(add-hook 'prog-mode-hook #'yas-minor-mode)

Where are the snippets?

Yasnippet no longer bundles snippets directly, but it's very easy to get some!

If you git-cloned yasnippet with the --recursive option you'll also download "git submodules" and find two subdirs under the main tree.

  1. snippets/

    Points to yasnippet-snippets the snippet collection of AndreaCrotti.

    The default configuraiton already points to this dir, so to use them, just make sure the submodule really was downloaded (i.e. there are some files under snippets/)

  2. yasmate/

    Points to a github repo of the yasmate tool, which is dedicated to converting textmate bundles into yasnippet snippets.

    To use these snippets you have to run the tool first, so see its doc), and then point the yas-snippet-dirs variable to the .../yasmate/snippets subdir.

    If you have a working ruby environment, you can probably get lucky directly with rake convert-bundles.

Naturally, you can point yas-snippet-dirs to good snippet collections out there. If you have created snippets for a mode, or multiple modes, consider creating a repository to host them, then tell users that it should be added like this to yas-snippet-dirs:

(setq yas-snippet-dirs
      '("~/.emacs.d/snippets"                 ;; personal snippets
        "/path/to/some/collection/"           ;; foo-mode and bar-mode snippet collection
        "/path/to/yasnippet/yasmate/snippets" ;; the yasmate collection
        "/path/to/yasnippet/snippets"         ;; the default collection
        ))

(yas-global-mode 1) ;; or M-x yas-reload-all if you've started YASnippet already.

Manual, issues etc

Please refer to the comprehensive documentation for full customisation and support. If you find a bug in the code or in the documentation, please report it on the GitHub issue tracker.

Important note regarding bug reporting

Your bug reports are very valuable.

The most important thing when reporting bugs is making sure that we have a way to reproduce the problem exactly like it happened to you.

To do this, we need to rule out interference from external factors like other Emacs extensions or your own customisations.

Here's an example report that "sandboxes" an Emacs session just for reproducing a bug.

$ emacs --version
Emacs 24.3
$ cd /tmp/
$ git clone https://github.com/capitaomorte/yasnippet.git yasnippet-bug
$ cd yasnippet-bug
$ git log -1 --oneline
6053db0 Closes #527: Unbreak case where yas-fallback-behaviour is a list
$ HOME=$PWD emacs -L  # This "sandboxes" your emacs, melpa configuration, etc

(require 'yasnippet)
(yas-global-mode 1)

When I open a foo-mode file I can't expand foo-mode snippets! 
OR
I can't get yasnippet to load because frankinbogen!

Using emacs -Q or temporarily moving your .emacs init file to the side is another way to achieve good reproducibility.

Here's a another example of a bug report. It has everything needed for a successful analysis and speedy resolution.

Also, don't forget to state the Emacs version (use M-x emacs-version) and the yasnippet version you are using (if using the latest from github, do git log -1 in the dir).

Any more info is welcome, but don't just paste a backtrace or an error message string you got, unless we ask for it.

There is also a YASnippet google group. I will keep the group open for reference and for discussion among users. Unfortunately I can't guarantee a timely response, so maybe it's better to create a github issue clearly marking your intent (user support/bug/feature request).

Finally, thank you very much for using YASnippet!

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