vim 使用cscope数据库的最简单方法
cscope是Linux世界最流行的源代码交叉索引工具。vim和emacs也都提供有对应的配制文件。
在源代码的最上层目录执行cscope -Rbq，就可在当前目录生成针对c语言的数据库。
-R是递归搜索所有子目录
-b是不进入cscope的命令行
-q是生成加快索引速度的cscope.in.out和cscope.po.out
-k是针对浏览内核代码提供的，即不索引到/usr/include中。因为内核不使用这些头文件。
因为vim会在环境变量CSCOPE_DB不存在的情况下，加载当前目录的数据库。
尽量不要使用环境变量CSCOPE_DB，这是多年使用后的经验。因为当在多个工程间切换，就需要手动
修改变量值，尽管可以通过脚本实现快速切换，由此带来的复杂度，也是得不偿失。
所以我所说的最简单的办法就是在含有数据库的当前目录中启动vim，数据库就会被加载。
每个工程的数据库都保存在该工程的最上层目录，这也就避免了多个工程间切换的过程。
当然上面所有都是建立在配制好的vim和cscope环境的基础上的。
如何配制可参考官方提供的详细的中文说明。
实际上只有一步，就是下载cscope_maps.vim，放到$HOME/.vim/plugin中，目录不存在就自己创建。
$ mkdir -p $HOME/.vim/plugin
然后就可以使用该配制文件里定义的快捷键进行索引了。
官方定义的快捷键有CTRL-空格，与中文用户常用输入法SCIM和ibus都冲突。
所以我修改了一下，使用CTRL-[，有兴趣的可以试试。
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