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Effortless ctags with git and submodules

Using Tim Popes Effortless ctags with Git I had the problem that tags for definitions in submodules where missing.

As I usually don't make changes in submodules and these submodules are quite big I don't want to run ctags on them every time I commit, I choose a manually approach to get tags inside submodules.

UPDATE Tim Pope removed the feature to add .git to the tags path in recent versions of vim-fugitive. We need to set it manually.


	set tags^=.git/sub.tags
	set tags^=.git/tags
to your vimrc. Then use
	ctags --tag-relative -f .git/sub.tags -R $submodule-dirs
where $submodule-dirs are your directories containing submodules to create a separate tags file.

If you want to run ctags every time on the submodules use the following approach:

After digging a little bit I saw that he is using git ls-files to find files to pass to ctags. A quick study of man git-ls-files showed that you need to pass --recurse-submodules to git ls-files in order to get all files included in the submodules.

Change the ctags-script to be

	set -e
	dir="git rev-parse --git-dir`"
	trap 'rm -f "$dir/$$.tags" EXIT
	git ls-files --recurse-submodules | \
		ctags --extra=+f --tag-relative -L - -f"$dir/$$.tags" --languages=-javascript,sql
	mv "$dir/$$.tags" "$dir/tags"

Note the extra --recurse-submodules behind git ls-files.

This will give you all definitions from submodules in your tags file. Note though, that this will take very long in large projects with many/big submodules. Especially when doing quick commits. A ctags process will be spawned every time you commit, even if there is already one running. This may result in heavy loads.