emacs capture怎么用？

[wisner]

我在网上看了一些教程，在init.el里添加一段代码：

(define-key global-map "\C-c c" 'org-capture)
(setq org-directory "~/org/")
(setq org-capture-templates
(quote (("i" "idea" entry (file (concat org-directory "~/org/idea.org"))
"* %^{Title} %?\n%U\n%a\n")
("t" "todo" entry (file (concat org-directory "~/org/gtd.org"))
"* TODO %?\n%U\n%a\n" :clock-in t :clock-resume t)
("n" "note" entry (file (concat org-directory "~/org/note.org"))
"* %? :NOTE:\n%U\n%a\n" :clock-in t :clock-resume t)
("j" "Journal" entry (file+datetree (concat org-directory "~/org/journal.org"))
"* %^{Title} %?\n%U\n%a\n" :clock-in t :clock-resume t)
("b" "Book" entry (file+datetree \t \t (concat org-directory "~/org/book.org"))
"* Topic: %^{Description} %^g %? Added: %U")

)))

快捷键C-c,c可以用了，然后按i,t,n,j,b会报错，invalid file location:nil。我文件路径没有设置对吗？我的家目录/home/unicorn,我在/home/unicorn/下面新建了一个org文件夹，在org文件夹里创建idea.org,gtd.org,note.org,journal.org和book.org。

[astolia]

emacs支持自动展开~吗？