Add support for hrsh7th/vim-vsnip snippets
Summary:
- Query vim-vsnip plugin for snippet completions and add the items
to the completion list.
- Add a boolean flag to set vsnip completion option
- Update documentation
- Without this enhancement vsnip could only expand LSP provided
snippets
- Inteface to vim-vsnip plugin is based on hrsh7th/cmp-vsnip
Following plugins need to be installed:
[required] hrsh7th/vim-vsnip
[required] hrsh7th/vim-vsnip-integ
[optional] rafamadriz/friendly-snippets
Options should be set as follows:
completionTextEdit: false,
snippetSupport: true,
vsnipSupport: true,
ultisnipsSupport: false,
Shortcoming:
Completion is not triggered for non-keyword characters like '#' (ex. #
before #if in C) even though vsnip is capable of such completion,
unless LSP server sets special characters as trigger characters. This
is not a major shortcoming since it will expand once a keyword
character is typed (say, #i in #if). To address this issue some code
reorganization is needed, and perhaps separation of completion
mechanism from the LSP client core.
User can define keymaps for Tab completion as follows:
(<Space> will expand the snippet)
def! g:LspCleverTab(): string
return pumvisible() ? "\<c-n>" : vsnip#jumpable(1) ?
\ "\<Plug>(vsnip-jump-next)" : g:WhitespaceOnly() ?
\ "\<tab>" : "\<c-n>"
enddef
def! g:LspCleverSTab(): string
return pumvisible() ? "\<c-p>" : vsnip#jumpable(-1) ?
\ "\<Plug>(vsnip-jump-prev)" : g:WhitespaceOnly() ?
\ "\<s-tab>" : "\<c-p>"
enddef
autocmd FileType java,c,cpp,python
\| iunmap <silent> <tab>
\| iunmap <silent> <s-tab>
\| inoremap <expr> <tab> g:LspCleverTab()
\| snoremap <expr> <tab> g:LspCleverTab()
\| inoremap <expr> <S-Tab> g:LspCleverSTab()
\| snoremap <expr> <S-Tab> g:LspCleverSTab()
M autoload/lsp/completion.vim
M autoload/lsp/options.vim
M doc/lsp.txt