ctags

--fields=+ln
--c-kinds=+p
--c++-kinds=+p
# Python: v are class members?!  l are local vars.  (with universal-ctags)
# --python-kinds=-iv
--langmap=php:.engine.inc.module.theme.install.php.php3.php4.php5.phtml
--langmap=sh:+(zshrc).zsh-theme
--langmap=vim:+.vader
--exclude=.tox
--exclude=build
--exclude=.build*
# Arch package dirs.
--exclude=pkg
--languages=-json

# Fails with --append?
# --tag-relative=yes

# Look for shebangs/modelines.
--guess-language-eagerly

# Nix; source: https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/misc/ctags/wrapped.nix
--langdef=NIX
--langmap=NIX:.nix
--regex-NIX=/(\S+)\s*=.*:/\1/f/
--regex-NIX=/^\s*(\S+)\s*=/\1/v/

# Look at .ctags for extra options.
# This can be used to ignore certain files per repo.
--options-maybe=./.ctags