VSCode(LSP)'s snippet feature in vim.

• Nested placeholders
  • You can define snippet like console.log($1${2:, $1})$0
• Nested snippet expansion
  • You can expand snippet even if you already activated other snippet (it will be merged as one snippet)
• Load snippet from VSCode extension
  • If you install VSCode extension via Plug 'golang/vscode-go', vsnip will load those snippets.
• Support many LSP-client & completion-engine by vim-vsnip-integ
  • LSP-client
    • vim-lsp
    • vim-lsc
    • LanguageClient-neovim
    • neovim built-in lsp
    • vim-lamp
  • completion-engine
    • deoplete.nvim
    • asyncomplete.vim
    • vim-mucomplete
    • completion-nvim
• Vim script interpolation
  • You can use Vim script interpolation as ${VIM:...Vim script expression...}.

• Pure Vim script
• Well tested (neovim/0.4.4, vim/8.0.1567)
• Support VSCode snippet format
• Provide integration with many plugins

friendly-snippets - Set of preconfigured snippets for all kind of programming languages that integrates really well with vim-vsnip, so all users can benefit from them and not to worry about setting up snippets on their own. It already includes:

• HTML, Pug, Jade
• CSS, Sass, Less, Stylus
• Javascript, Typescript, Javascriptreact, Typescriptreact
• PHP
• Python
• C
• C++
• Rust
• Go
• Eruby
• Ruby
• Swift

You can use your favorite plugin managers to install this plugin.

Plug 'hrsh7th/vim-vsnip'
Plug 'hrsh7th/vim-vsnip-integ'

call dein#add('hrsh7th/vim-vsnip')
call dein#add('hrsh7th/vim-vsnip-integ')

NeoBundle 'hrsh7th/vim-vsnip'
NeoBundle 'hrsh7th/vim-vsnip-integ'

" NOTE: You can use other key to expand snippet.

" Expand
imap <expr> <C-j>   vsnip#expandable()  ? '<Plug>(vsnip-expand)'         : '<C-j>'
smap <expr> <C-j>   vsnip#expandable()  ? '<Plug>(vsnip-expand)'         : '<C-j>'

" Expand or jump
imap <expr> <C-l>   vsnip#available(1)  ? '<Plug>(vsnip-expand-or-jump)' : '<C-l>'
smap <expr> <C-l>   vsnip#available(1)  ? '<Plug>(vsnip-expand-or-jump)' : '<C-l>'

" Jump forward or backward
imap <expr> <Tab>   vsnip#jumpable(1)   ? '<Plug>(vsnip-jump-next)'      : '<Tab>'
smap <expr> <Tab>   vsnip#jumpable(1)   ? '<Plug>(vsnip-jump-next)'      : '<Tab>'
imap <expr> <S-Tab> vsnip#jumpable(-1)  ? '<Plug>(vsnip-jump-prev)'      : '<S-Tab>'
smap <expr> <S-Tab> vsnip#jumpable(-1)  ? '<Plug>(vsnip-jump-prev)'      : '<S-Tab>'

" Select or cut text to use as $TM_SELECTED_TEXT in the next snippet.
" See https://github.com/hrsh7th/vim-vsnip/pull/50
nmap        s   <Plug>(vsnip-select-text)
xmap        s   <Plug>(vsnip-select-text)
nmap        S   <Plug>(vsnip-cut-text)
xmap        S   <Plug>(vsnip-cut-text)

" If you want to use snippet for multiple filetypes, you can `g:vsnip_filetypes` for it.
let g:vsnip_filetypes = {}
let g:vsnip_filetypes.javascriptreact = ['javascript']
let g:vsnip_filetypes.typescriptreact = ['typescript']

Snippet file will store to g:vsnip_snippet_dir per filetype.

1. Open some file (example: Sample.js)
2. Invoke :VsnipOpen command.
3. Edit snippet.

{
  "Class": {
    "prefix": ["class"],
    "body": [
      "/**",
      " * @author ${VIM:\\$USER}",
      " */",
      "class $1 ${2:extends ${3:Parent} }{",
      "\tconstructor() {",
      "\t\t$0",
      "\t}",
      "}"
    ],
    "description": "Class definition template."
  }
}

The snippet format was described in here or here.

You can insert the filename via fname\<Plug>(vsnip-expand).

{
  "filename": {
    "prefix": ["fname"],
    "body": "$TM_FILENAME_BASE"
  }
}

You can fill $TM_SELECTED_TEXT by <Plug>(vsnip-select-text) or <Plug>(vsnip-cut-text).

{
  "log": {
    "prefix": ["log"],
    "body": "console.log(${1:$TM_SELECTED_TEXT});"
  }
}

You can insert value by Vim script expression.

{
  "user": {
    "prefix": "username",
    "body": "${VIM:\\$USER}"
  }
}

You can insert UUID via python.

{
  "uuid": {
    "prefix": "uuid",
    "body": [
      "${VIM:system('python -c \"import uuid, sys;sys.stdout.write(str(uuid.uuid4()))\"')}"
    ]
  }
}

NOTE: $VIM is only in vsnip. So that makes to lost the snippet portability.

You can run npm run test after install vim-themis.

1. compute the user-diff ... s:Session.flush_changes
2. reflect the user-diff to snippet ast ... s:Snippet.follow
3. reflect the sync-diff to buffer content ... s:Snippet.sync & s:Session.flush_changes