Ease Life With YASnippet

安装使用package-install，实际上可以写一个简易方法避免重复劳动：

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(defun require-package (package)
  "Install given PACKAGE."
  (unless (package-installed-p package)
    (unless (assoc package package-archive-contents)
      (package-refresh-contents))
    (package-install package)))

学习下其中的1个function

assoc is a built-in function in `C source code’.

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(assoc KEY LIST)

Return non-nil if KEY is `equal’ to the car of an element of LIST. The value is actually the first element of LIST whose car equals KEY.

开始学习如何使用YASnippet。

1 组织你的 Snippets (Organizing Snippets)

Snippet的定义是储存在文件系统的文件中。YASnippet的触发机制会找到这些snippet tables，然后展开。

首先，新建一个目录：my-snippets，用来存放自定义的snippets。

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(require 'yasnippet)

(setq yas-snippet-dirs (concat user-emacs-directory "my-snippets"))

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

看下是怎么组织snippets的（这是YASnippet自带的）：

.yas.parent文件可以共享其他目录下的snippets。

如果有一个空的.yas-make-groups文件，会在 YASnippet Menu按照目录结构组织地更清晰。

2 展开你的 Snippets (Traiggering expansion)

很多中方式能展开snippets，包括：

  • By typing an abbrev, the snippet trigger key, and then pressing the key defined in yas/trigger-key (which defaults 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 hippie-expand

以上是3中最常见的方法（虽然我不知道什么是 hippie-expand）。