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133 lines
4.1 KiB
Org Mode
133 lines
4.1 KiB
Org Mode
#+SETUPFILE: org-setup.inc
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#+TITLE: Organizing snippets
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* Basic structure
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Snippet collections can be stored in plain text files. They are
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arranged by sub-directories naming *snippet tables*. These mostly
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name Emacs major mode names.
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#+begin_example
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.
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|-- c-mode
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| `-- printf
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|-- java-mode
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| `-- println
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`-- text-mode
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|-- email
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`-- time
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#+end_example
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The collections are loaded into *snippet tables* which the
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triggering mechanism (see [[file:snippet-expansion.org][Expanding Snippets]]) looks up and
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(hopefully) causes the right snippet to be expanded for you.
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* Setting up =yas-snippet-dirs=
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The emacs variable [[sym:yas-snippet-dirs][=yas-snippet-dirs=]] tells YASnippet
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which collections to consider. It's used when you activate
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[[sym:yas-global-mode][=yas-global-mode=]] or call
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[[sym:yas-reload-all][=yas-reload-all=]] interactively.
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The default considers:
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- a personal collection that lives in =~/.emacs.d/snippets=
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- the bundled collection, taken as a relative path to =yasnippet.el= location
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When you come across other snippet collections, do the following to try them
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out:
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#+begin_src emacs-lisp :exports code
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;; Develop in ~/emacs.d/mysnippets, but also
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;; try out snippets in ~/Downloads/interesting-snippets
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(setq yas-snippet-dirs '("~/emacs.d/mysnippets"
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"~/Downloads/interesting-snippets"))
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;; OR, keeping YASnippet defaults try out ~/Downloads/interesting-snippets
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(setq yas-snippet-dirs (append yas-snippet-dirs
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'("~/Downloads/interesting-snippets")))
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#+end_src
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Collections appearing earlier in the list override snippets with same names
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appearing in collections later in the list. [[sym:yas-new-snippet][=yas-new-snippet=]] always stores
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snippets in the first collection.
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* The =.yas-parents= file
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It's very useful to have certain modes share snippets between
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themselves. To do this, choose a mode subdirectory and place a
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=.yas-parents= containing a whitespace-separated list of other mode
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names. When you reload those modes become parents of the original
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mode.
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#+begin_example
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.
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|-- c-mode
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| |-- .yas-parents # contains "cc-mode text-mode"
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| `-- printf
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|-- cc-mode
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| |-- for
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| `-- while
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|-- java-mode
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| |-- .yas-parents # contains "cc-mode text-mode"
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| `-- println
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`-- text-mode
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|-- email
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`-- time
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#+end_example
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* TODO The =.yas-make-groups= file
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If you place an empty plain text file =.yas-make-groups= inside one
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of the mode directories, the names of these sub-directories are
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considered groups of snippets and [[file:snippet-menu.org][the menu]] is organized much more
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cleanly:
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[[./images/menu-groups.png]]
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Another way to achieve this is to place a =# group:= directive
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inside the snippet definition. See [[./snippet-development.org][Writing Snippets]].
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#+begin_example
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$ tree ruby-mode/
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ruby-mode/
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|-- .yas-make-groups
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|-- collections
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| |-- each
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| `-- ...
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|-- control structure
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| |-- forin
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| `-- ...
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|-- definitions
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| `-- ...
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`-- general
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`-- ...
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#+end_example
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Yet another way to create a nice snippet menu is to write into
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=.yas-make-groups= a menu definition. TODO
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* The =.yas-setup.el= file
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If there is file named =.yas-setup.el= in a mode's snippet
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subdirectory, it is loaded along with the snippets. Utility
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functions used by the snippets can be put here.
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* The =.yas-compiled-snippet.el= file
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You may compile a top-level snippet directory with the
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=yas-compile-directory= function, which will create a
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=.yas-compiled-snippets.el= file under each mode subdirectory,
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which contains definitions for all snippets in the subdirectory.
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Compilation helps improve loading time.
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Alternatively, you may compile all directories in the list
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=yas-snippet-dirs= with the =yas-recompile-all= function.
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* The =.yas-skip= file
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A =.yas-skip= file in a mode's snippet subdirectory tells YASnippet
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not to load snippets from there.
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