# vim + ctags + gtags(+cscope)

### ctags:

$ sudo apt-get install exuberant-ctags
$ cd project/
$ ctags -R *

It will produce file "tags"

### gtags:

$ sudo apt-get install global
$ cd project/
$ find . -name "*.[ch]" > gtags.files
$ gtags

It will produce file "gtags.files, GPATH, GRTAGS, GSYMS, GTAGS"

### vim plugin

modify ~/.vimrc

set cscopeprg=gtags-cscope
cs add GTAGS

    nmap <C-\>s :cs find s <C-R>=expand("<cword>")<CR><CR>
    nmap <C-\>g :cs find g <C-R>=expand("<cword>")<CR><CR>
    nmap <C-\>c :cs find c <C-R>=expand("<cword>")<CR><CR>
    nmap <C-\>t :cs find t <C-R>=expand("<cword>")<CR><CR>
    nmap <C-\>e :cs find e <C-R>=expand("<cword>")<CR><CR>
    nmap <C-\>f :cs find f <C-R>=expand("<cfile>")<CR><CR>
    nmap <C-\>i :cs find i ^<C-R>=expand("<cfile>")<CR>$<CR>
    nmap <C-\>d :cs find d <C-R>=expand("<cword>")<CR><CR>

Then you can use ctag and gtags on vim
but remember, you need open file on project root
ex.

$ vim /project/folderA/fileA.c

Command:

* ctag:

C-] // Go to Definition 
C-t // Go back

* gtags

C-\ and press s   // find string on the project

If you update the code, you need update the tag
You can use following script:

### rebuild tag script (```buildtag.sh```)

#!/bin/bash
# sudo apt-get install exuberant-ctags
# sudo apt-get install global

file=gtags.files

echo Work directory is $PWD
cd $PWD
ctags -R *
if [ -f "$file" ]
then
    global -u
else
    find . -name "*.[ch]" > gtags.files
    gtags
fi
echo Build tag Done

and use this command to rebuild:
If you put buildtag.sh on home directory

$ cd project
$ ~/buildtag.sh

Reference:
http://linux.byexamples.com/archives/385/vim-with-ctags-for-multi-level-directory-hierarchy/

http://ldshyu.blogspot.tw/2013/06/coding-tag.html

http://forum.ubuntu.org.cn/viewtopic.php?t=343460

http://cscope.sourceforge.net/cscope_maps.vim