org module之org-toc

org-toc可以为当前Org文件生成一个目录，在这个目录中导航可以跳转到相应的Org位置上。 不过鉴于org本来就是个大纲类的模式，所以我觉得这个module意义不大啊。

在带标题的Org文件(没有标题的话会提示错误)中运行 org-toc-show 命令,就会弹出一个 org-toc buffer，其中列出了当前Org文件的目录。

这个buffer处于 org-toc-mode，并提供了多个导航快捷键，项目快捷键说明可以运行 M-x org-toc-help 来查看,如下所示:

[space]   show heading                     [1-4] hide headlines below this level
[TAB]     jump to heading                  [F]   toggle follow mode (currently off)
[return]  jump and delete others windows   [i]   toggle info mode (currently off)
[S-TAB]   cycle subtree (in Org)           [S]   toggle show subtree mode (currently off)
[C-S-TAB] global cycle (in Org)            [r]   toggle recenter mode (currently on, line 0)
[:]       cycle subtree (in TOC)           [c]   toggle column view (currently off)
[n/p]     next/previous heading            [s]   save TOC configuration
[f/b]     next/previous heading of same level
[q]       quit the TOC                     [g]   restore last TOC configuration