neovimでhaskell

# 前提【haskell+hls+vscode環境は構築済み】

# neovimをインストール(linux)
    sudo apt install neovim

# 設定(linux)
    export XDG_CONFIG_HOME=~/.config
    mkdir -p ~/.config
    ln -s ~/.vim ~/.config/nvim
    ln -s ~/.vimrc ~/.config/nvim/init.vim

# link差し替え(linux)
    sudo mv /usr/bin/vi /usr/bin/vi.org
    sudo ln -s /usr/bin/nvim /usr/bin/vi

# neovimをインストール(windows)
    winget install Neovim.Neovim

# viで起動できるよう、リンクを作成する(管理者で実行)
インストールディレクトリで以下のコマンド発行
MKLINK [[/D] | [/H] | [/J]] リンク ターゲット

    cd "C:\Program Files\Neovim\bin"
    mklink vi.exe nvim.exe

# coc-nvim関連
## node.jsをインストール
https://nodejs.org/ja
msiファイルをダウンロードし、インストール

## linux
    curl -fsSL https://deb.nodesource.com/setup_19.x | sudo -E bash - &&\
    sudo apt-get install -y nodejs

## nvim-plugをインストール(windows)
    iwr -useb https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim |`
    ni $HOME/vimfiles/autoload/plug.vim -Force

## nvim-plugをインストール(linux)
    sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs \
       https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'

## プラグイン設定ファイルを作成
C:\Users\ueki0\AppData\Local\nvim\init.vim

    call plug#begin()
    Plug 'neoclide/coc.nvim', {'branch': 'release'}
    call plug#end()

## neovimを起動して以下コマンド発行
:PlugInstall
※設定ファイル記載のプラグインがインストールされる

## language serverの設定(coc-settings.json)
:CocConfig

    {
      "languageserver": {
        "haskell": {
          "command": "haskell-language-server-wrapper",
          "args": ["--lsp"],
          "rootPatterns": ["*.cabal", "stack.yaml", "cabal.project", "package.yaml", "hie.yaml"],
          "filetypes": ["haskell", "lhaskell"]
        }
      }
    }

## キーバインド等の設定を追加(init.vim)

    " May need for Vim (not Neovim) since coc.nvim calculates byte offset by count
    " utf-8 byte sequence
    set encoding=utf-8
    " Some servers have issues with backup files, see #649
    set nobackup
    set nowritebackup
    
    " Having longer updatetime (default is 4000 ms = 4s) leads to noticeable
    " delays and poor user experience
    set updatetime=300
    
    " Always show the signcolumn, otherwise it would shift the text each time
    " diagnostics appear/become resolved
    set signcolumn=yes
    
    " Use tab for trigger completion with characters ahead and navigate
    " NOTE: There's always complete item selected by default, you may want to enable
    " no select by `"suggest.noselect": true` in your configuration file
    " NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
    " other plugin before putting this into your config
    inoremap <silent><expr> <TAB>
          \ coc#pum#visible() ? coc#pum#next(1) :
          \ CheckBackspace() ? "\<Tab>" :
          \ coc#refresh()
    inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
    
    " Make <CR> to accept selected completion item or notify coc.nvim to format
    " <C-g>u breaks current undo, please make your own choice
    inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
                                  \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
    
    function! CheckBackspace() abort
      let col = col('.') - 1
      return !col || getline('.')[col - 1]  =~# '\s'
    endfunction
    
    " Use <c-space> to trigger completion
    if has('nvim')
      inoremap <silent><expr> <c-space> coc#refresh()
    else
      inoremap <silent><expr> <c-@> coc#refresh()
    endif
    
    " Use `[g` and `]g` to navigate diagnostics
    " Use `:CocDiagnostics` to get all diagnostics of current buffer in location list
    nmap <silent> [g <Plug>(coc-diagnostic-prev)
    nmap <silent> ]g <Plug>(coc-diagnostic-next)
    
    " GoTo code navigation
    nmap <silent> gd <Plug>(coc-definition)
    nmap <silent> gy <Plug>(coc-type-definition)
    nmap <silent> gi <Plug>(coc-implementation)
    nmap <silent> gr <Plug>(coc-references)
    
    " Use K to show documentation in preview window
    nnoremap <silent> K :call ShowDocumentation()<CR>
    
    function! ShowDocumentation()
      if CocAction('hasProvider', 'hover')
        call CocActionAsync('doHover')
      else
        call feedkeys('K', 'in')
      endif
    endfunction
    
    " Highlight the symbol and its references when holding the cursor
    autocmd CursorHold * silent call CocActionAsync('highlight')
    
    " Symbol renaming
    nmap <leader>rn <Plug>(coc-rename)
    
    " Formatting selected code
    xmap <leader>f  <Plug>(coc-format-selected)
    nmap <leader>f  <Plug>(coc-format-selected)
    
    augroup mygroup
      autocmd!
      " Setup formatexpr specified filetype(s)
      autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
      " Update signature help on jump placeholder
      autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
    augroup end
    
    " Applying code actions to the selected code block
    " Example: `<leader>aap` for current paragraph
    xmap <leader>a  <Plug>(coc-codeaction-selected)
    nmap <leader>a  <Plug>(coc-codeaction-selected)
    
    " Remap keys for applying code actions at the cursor position
    nmap <leader>ac  <Plug>(coc-codeaction-cursor)
    " Remap keys for apply code actions affect whole buffer
    nmap <leader>as  <Plug>(coc-codeaction-source)
    " Apply the most preferred quickfix action to fix diagnostic on the current line
    nmap <leader>qf  <Plug>(coc-fix-current)
    
    " Remap keys for applying refactor code actions
    nmap <silent> <leader>re <Plug>(coc-codeaction-refactor)
    xmap <silent> <leader>r  <Plug>(coc-codeaction-refactor-selected)
    nmap <silent> <leader>r  <Plug>(coc-codeaction-refactor-selected)
    
    " Run the Code Lens action on the current line
    nmap <leader>cl  <Plug>(coc-codelens-action)
    
    " Map function and class text objects
    " NOTE: Requires 'textDocument.documentSymbol' support from the language server
    xmap if <Plug>(coc-funcobj-i)
    omap if <Plug>(coc-funcobj-i)
    xmap af <Plug>(coc-funcobj-a)
    omap af <Plug>(coc-funcobj-a)
    xmap ic <Plug>(coc-classobj-i)
    omap ic <Plug>(coc-classobj-i)
    xmap ac <Plug>(coc-classobj-a)
    omap ac <Plug>(coc-classobj-a)
    
    " Remap <C-f> and <C-b> to scroll float windows/popups
    if has('nvim-0.4.0') || has('patch-8.2.0750')
      nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
      nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
      inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
      inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
      vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
      vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
    endif
    
    " Use CTRL-S for selections ranges
    " Requires 'textDocument/selectionRange' support of language server
    nmap <silent> <C-s> <Plug>(coc-range-select)
    xmap <silent> <C-s> <Plug>(coc-range-select)
    
    " Add `:Format` command to format current buffer
    command! -nargs=0 Format :call CocActionAsync('format')
    
    " Add `:Fold` command to fold current buffer
    command! -nargs=? Fold :call     CocAction('fold', <f-args>)
    
    " Add `:OR` command for organize imports of the current buffer
    command! -nargs=0 OR   :call     CocActionAsync('runCommand', 'editor.action.organizeImport')
    
    " Add (Neo)Vim's native statusline support
    " NOTE: Please see `:h coc-status` for integrations with external plugins that
    " provide custom statusline: lightline.vim, vim-airline
    set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}
    
    " Mappings for CoCList
    " Show all diagnostics
    nnoremap <silent><nowait> <space>a  :<C-u>CocList diagnostics<cr>
    " Manage extensions
    nnoremap <silent><nowait> <space>e  :<C-u>CocList extensions<cr>
    " Show commands
    nnoremap <silent><nowait> <space>c  :<C-u>CocList commands<cr>
    " Find symbol of current document
    nnoremap <silent><nowait> <space>o  :<C-u>CocList outline<cr>
    " Search workspace symbols
    nnoremap <silent><nowait> <space>s  :<C-u>CocList -I symbols<cr>
    " Do default action for next item
    nnoremap <silent><nowait> <space>j  :<C-u>CocNext<CR>
    " Do default action for previous item
    nnoremap <silent><nowait> <space>k  :<C-u>CocPrev<CR>
    " Resume latest coc list
    nnoremap <silent><nowait> <space>p  :<C-u>CocListResume<CR>