YCM not loading for: 'rust'

[miguelmartin75]

In my vimc I have the following line:

Plug 'Valloric/YouCompleteMe', { 'do': './install.sh --clang-completer', 'for': 'c,cpp,objc,objcpp,cs,python,rust' }

Oddly enough, it does not load the YouCompleteMe plugin for rust file types (.rs files). However, I also have these lines specific for rust, but they seem to be loaded:

Plug 'phildawes/racer', { 'do': 'cargo build --release', 'for': 'rust' }
Plug 'wting/rust.vim', { 'for' : 'rust' }

If I remove the 'for': 'c,cpp,objc,objcpp,cs,python,rust' then it works fine, i.e. if I have the following instead:

Plug 'Valloric/YouCompleteMe', { 'do': './install.sh --clang-completer' }

Note for those interested, I'm using YCM to automatically pop-up Racer's omni-complete via manually setting an entry for rust in g:ycm_semantic_triggers.

[junegunn]

See YCM example here: https://github.com/junegunn/vim-plug#on-demand-loading-of-plugins

The reason YCM does not load is that it only executes its Enable function on VimEnter, so it has to be manually triggered.

[miguelmartin75]

I changed my line to:

Plug 'Valloric/YouCompleteMe', { 'do': './install.sh --clang-completer', 'for': ['c', 'cpp', 'objc', 'objcpp', 'cs', 'python', 'rust'] }

and it works, without the line you suggested that I should add:

autocmd! User YouCompleteMe call youcompleteme#Enable()

😕

[junegunn]

Maybe they changed something? I don't know, I don't use YCM.

Anyway, for option was designed to take a string of a single file type or a list of multiple file types, and there's no code in vim-plug that processes comma-separated file types. It may not work correctly if you have multiple plugins with overlapping sets of for options.

Plug 'foo', { 'for': 'a,b,c' }
Plug 'bar', { 'for': 'b,c' }

When a file of type a is open, foo is loaded, and vim-plug will try to clear the hook by executing autocmd! PlugLOD Filetype a,b,c, which will cause the autocmds for bar to be cleared as well, and bar will never get loaded.

But if you specify the types as a list, vim-plug will correctly handle such cases.

Plug 'foo', { 'for': ['a', 'b', 'c'] }
Plug 'bar', { 'for': ['b', 'c'] }